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51220 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Jes Cok
|
a05a25cb19 |
bytes,internal/bytealg: add func bytealg.LastIndexRabinKarp
Also rename 'substr' to 'sep' in IndexRabinKarp for consistency. Change-Id: Icc2ad1116aecaf002c8264daa2fa608306c9a88a GitHub-Last-Rev: 1784b93f53d569991f86585f9011120ea26f193f GitHub-Pull-Request: golang/go#63854 Reviewed-on: https://go-review.googlesource.com/c/go/+/538716 Reviewed-by: Keith Randall <khr@google.com> Auto-Submit: Keith Randall <khr@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Keith Randall <khr@golang.org> |
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Bryan C. Mills
|
0330aad038 |
os: report IO_REPARSE_TAG_DEDUP files as regular in Stat and Lstat
Prior to CL 460595, Lstat reported most reparse points as regular files. However, reparse points can in general implement unusual behaviors (consider IO_REPARSE_TAG_AF_UNIX or IO_REPARSE_TAG_LX_CHR), and Windows allows arbitrary user-defined reparse points, so in general we must not assume that an unrecognized reparse tag represents a regular file; in CL 460595, we began marking them as irregular. As it turns out, the Data Deduplication service on Windows Server runs an Optimization job that turns regular files into reparse files with the tag IO_REPARSE_TAG_DEDUP. Those files still behave more-or-less like regular files, in that they have well-defined sizes and support random-access reads and writes, so most programs can treat them as regular files without difficulty. However, they are still reparse files: as a result, on servers with the Data Deduplication service enabled, files could arbitrarily change from “regular” to “irregular” without explicit user intervention. Since dedup files are converted in the background and otherwise behave like regular files, this change adds a special case to report DEDUP reparse points as regular. Fixes #63429. No test because to my knowledge we don't have any Windows builders that have the deduplication service enabled, nor do we have a way to reliably guarantee the existence of an IO_REPARSE_TAG_DEDUP file. (In theory we could add a builder with the service enabled on a specific volume, write a test that encodes knowledge of that volume, and use the GO_BUILDER_NAME environment variable to run that test only on the specially-configured builders. However, I don't currently have the bandwidth to reconfigure the builders in this way, and given the simplicity of the change I think it is unlikely to regress accidentally.) Change-Id: I649e7ef0b67e3939a980339ce7ec6a20b31b23a1 Cq-Include-Trybots: luci.golang.try:gotip-windows-amd64-longtest Reviewed-on: https://go-review.googlesource.com/c/go/+/537915 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Alex Brainman <alex.brainman@gmail.com> Reviewed-by: Quim Muntal <quimmuntal@gmail.com> Auto-Submit: Bryan Mills <bcmills@google.com> |
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Robert Griesemer
|
b7a695bd68 |
cmd/compile/internal/syntax: better error messages for incorrect type parameter list
When parsing a declaration of the form
type a [b[c]]d
where a, b, c, d stand for identifiers, b[c] is parsed as a type
constraint (because an array length must be constant and an index
expression b[c] is never constant, even if b is a constant string
and c a constant index - this is crucial for disambiguation of the
various possibilities).
As a result, the error message referred to a missing type parameter
name and not an invalid array declaration.
Recognize this special case and report both possibilities (because
we can't be sure without type information) with the new error:
"missing type parameter name or invalid array length"
ALso, change the previous error message
"type parameter must be named"
to
"missing type parameter name"
which is more fitting as the error refers to an absent type parameter
(rather than a type parameter that's somehow invisibly present but
unnamed).
Fixes #60812.
Change-Id: Iaad3b3a9aeff9dfe2184779f3d799f16c7500b34
Reviewed-on: https://go-review.googlesource.com/c/go/+/538856
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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Robert Griesemer
|
34a5830c26 |
cmd/compile/internal/syntax: fix/update various comments
Change-Id: I30b448c8fcdbad94afcd7ff0dfc5cfebb485bdd7 Reviewed-on: https://go-review.googlesource.com/c/go/+/538855 Auto-Submit: Robert Griesemer <gri@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Robert Griesemer <gri@google.com> Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com> |
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Joel Sing
|
0aa2197279 |
os/signal: use syscall.Wait4 directly in tests
Rather than using syscall.Syscall6 with SYS_WAIT4, use syscall.Wait4 directly. Updates #59667 Change-Id: I50fea3b7d10003dbc632aafd5e170a9fe96d6f42 Reviewed-on: https://go-review.googlesource.com/c/go/+/538459 Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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|
Joel Sing
|
1a58fd0fda |
syscall: regen zsyscall for openbsd/riscv64
This removes the unused writelen function, which was cleaned up for other platforms in CL#529035. Change-Id: I1999dc81276763bdc73d8590c16729447c4e8538 Reviewed-on: https://go-review.googlesource.com/c/go/+/538119 Reviewed-by: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Joel Sing <joel@sing.id.au> |
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Joel Sing
|
6ecadb4d87 |
syscall: regenerate zsyscall for dragonfly/freebsd/netbsd
The sysctl declaration was moved in CL 141639, however the files were presumably not regenerated. There is no functional change, however regenerating avoids unrelated noise in future diffs. Change-Id: Ifb840b5853f3f1c3c88a3f94df21b6f6d3c635d4 Reviewed-on: https://go-review.googlesource.com/c/go/+/538118 TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Cherry Mui <cherryyz@google.com> |
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apocelipes
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e73e25b624 |
internal/cpu: add comments to copied functions
Just as same as other copied functions, like stringsTrimSuffix in "os/executable_procfs.go" Change-Id: I9c9fbd75b009a5ae0e869cf1fddc77c0e08d9a67 GitHub-Last-Rev: 4c18865e15ede0f53121b6845a1879cdd70d1a38 GitHub-Pull-Request: golang/go#63704 Reviewed-on: https://go-review.googlesource.com/c/go/+/537056 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Martin Möhrmann <moehrmann@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Martin Möhrmann <moehrmann@google.com> Reviewed-by: Keith Randall <khr@golang.org> |
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Cherry Mui
|
d2f3a68bf0 |
runtime: use testenv.Command in TestG0StackOverflow
For debugging timeouts. Change-Id: I08dc86ec0264196e5fd54066655e94a9d062ed80 Reviewed-on: https://go-review.googlesource.com/c/go/+/538697 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Bryan Mills <bcmills@google.com> |
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Keith Randall
|
b11defeaed |
runtime: make select fairness test less picky
Allow up to 10 standard deviations from the mean, instead of ~5 that the current test allows. 10 standard deviations allows up to a 4500/5500 split. Fixes #52465 Change-Id: Icb21c1d31fafbcf4723b75435ba5e98863e812c4 Reviewed-on: https://go-review.googlesource.com/c/go/+/538815 Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Keith Randall <khr@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
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Keith Randall
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962ccbef91 |
cmd/compile: ensure pointer arithmetic happens after the nil check
Have nil checks return a pointer that is known non-nil. Users of that pointer can use the result, ensuring that they are ordered after the nil check itself. The order dependence goes away after scheduling, when we've fixed an order. At that point we move uses back to the original pointer so it doesn't change regalloc any. This prevents pointer arithmetic on nil from being spilled to the stack and then observed by a stack scan. Fixes #63657 Change-Id: I1a5fa4f2e6d9000d672792b4f90dfc1b7b67f6ea Reviewed-on: https://go-review.googlesource.com/c/go/+/537775 Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> |
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|
Keith Randall
|
43b57b8516 |
cmd/compile: handle constant pointer offsets in dead store elimination
Update #63657 Update #45573 Change-Id: I163c6038c13d974dc0ca9f02144472bc05331826 Reviewed-on: https://go-review.googlesource.com/c/go/+/538595 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Keith Randall <khr@google.com> |
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Keith Randall
|
66b8107a26 |
runtime: on arm32, detect whether we have sync instructions
Make the choice of using these instructions dynamic (triggered by cpu feature detection) rather than static (trigered by GOARM setting). if GOARM>=7, we know we have them. For GOARM=5/6, dynamically dispatch based on auxv information. Update #17082 Update #61588 Change-Id: I8a50481d942f62cf36348998a99225d0d242f8af Reviewed-on: https://go-review.googlesource.com/c/go/+/525637 TryBot-Result: Gopher Robot <gobot@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Run-TryBot: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> |
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Mateusz Poliwczak
|
dd84bb6824 |
crypto/x509: add new OID type and use it in Certificate
Fixes #60665 Change-Id: I814b7d4b26b964f74443584fb2048b3e27e3b675 GitHub-Last-Rev: 693c741c76e6369e36aa2a599ee6242d632573c7 GitHub-Pull-Request: golang/go#62096 Reviewed-on: https://go-review.googlesource.com/c/go/+/520535 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Mateusz Poliwczak <mpoliwczak34@gmail.com> Auto-Submit: Roland Shoemaker <roland@golang.org> Reviewed-by: Roland Shoemaker <roland@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> |
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|
Jes Cok
|
68e52bc03c |
bytes,internal/bytealg: eliminate IndexRabinKarpBytes using generics
This is a follow-up to CL 538175. Change-Id: Iec2523b36a16d7e157c17858c89fcd43c2470d58 GitHub-Last-Rev: 812d36e57c71ea3bf44d2d64bde0703ef02a1b91 GitHub-Pull-Request: golang/go#63770 Reviewed-on: https://go-review.googlesource.com/c/go/+/538195 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Keith Randall <khr@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Bryan Mills <bcmills@google.com> |
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|
Jes Cok
|
cbc403af1d |
cmd/compile/internal/ssa: adjust default to the end in *Block.AuxIntString
Change-Id: Id48cade7811e2dfbf78d3171fe202ad272534e37 GitHub-Last-Rev: ea6abb2dc216ebd4a42fc3dc25f39ea6869d2dad GitHub-Pull-Request: golang/go#63808 Reviewed-on: https://go-review.googlesource.com/c/go/+/538377 Auto-Submit: Keith Randall <khr@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> |
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Cuong Manh Le
|
3dea7c3f69 |
hash/maphash: weaken avalanche test a bit more
CL 495415 weaken avalanche, making allowed range from 43% to 57%. Since then, we only see a failure with 58% on linux-386-longtest builder, so let give the test a bit more wiggle room: 40% to 59%. Fixes #60170 Change-Id: I9528ebc8601975b733c3d9fd464ce41429654273 Reviewed-on: https://go-review.googlesource.com/c/go/+/538655 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com> |
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cui fliter
|
289b823ac9 |
internal/bytealg: optimize Count/CountString in arm64
For #63678 goos: darwin goarch: arm64 pkg: strings │ count_old.txt │ count_new.txt │ │ sec/op │ sec/op vs base │ CountHard1-8 368.7µ ± 11% 332.0µ ± 1% -9.95% (p=0.002 n=10) CountHard2-8 348.8µ ± 5% 333.1µ ± 1% -4.51% (p=0.000 n=10) CountHard3-8 402.7µ ± 25% 359.5µ ± 1% -10.75% (p=0.000 n=10) CountTorture-8 10.536µ ± 23% 9.913µ ± 0% -5.91% (p=0.000 n=10) CountTortureOverlapping-8 74.86µ ± 9% 67.56µ ± 1% -9.75% (p=0.000 n=10) CountByte/10-8 6.905n ± 3% 6.690n ± 1% -3.11% (p=0.001 n=10) CountByte/32-8 3.247n ± 13% 3.207n ± 2% -1.23% (p=0.030 n=10) CountByte/4096-8 83.72n ± 1% 82.58n ± 1% -1.36% (p=0.007 n=10) CountByte/4194304-8 85.17µ ± 5% 84.02µ ± 8% ~ (p=0.075 n=10) CountByte/67108864-8 1.497m ± 8% 1.397m ± 2% -6.69% (p=0.000 n=10) geomean 9.977µ 9.426µ -5.53% │ count_old.txt │ count_new.txt │ │ B/s │ B/s vs base │ CountByte/10-8 1.349Gi ± 3% 1.392Gi ± 1% +3.20% (p=0.002 n=10) CountByte/32-8 9.180Gi ± 11% 9.294Gi ± 2% +1.24% (p=0.029 n=10) CountByte/4096-8 45.57Gi ± 1% 46.20Gi ± 1% +1.38% (p=0.007 n=10) CountByte/4194304-8 45.86Gi ± 5% 46.49Gi ± 7% ~ (p=0.075 n=10) CountByte/67108864-8 41.75Gi ± 8% 44.74Gi ± 2% +7.16% (p=0.000 n=10) geomean 16.10Gi 16.55Gi +2.85% Change-Id: Ifc2173ba3a926b0fa9598372d4404b8645929d45 Reviewed-on: https://go-review.googlesource.com/c/go/+/538116 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com> Run-TryBot: shuang cui <imcusg@gmail.com> Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
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Joel Sing
|
e293c4b509 |
runtime: allocate crash stack via stackalloc
On some platforms (notably OpenBSD), stacks must be specifically allocated and marked as being stack memory. Allocate the crash stack using stackalloc, which ensures these requirements are met, rather than using a global Go variable. Fixes #63794 Change-Id: I6513575797dd69ff0a36f3bfd4e5fc3bd95cbf50 Reviewed-on: https://go-review.googlesource.com/c/go/+/538457 Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com> Reviewed-by: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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Robert Griesemer
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b7a66be69c |
cmd/compile/internal/syntax: set up dummy name and type if func name is missing
We do the same elsewhere (e.g. in parser.name when a name is missing). This ensures functions have a (dummy) name and a non-nil type. Avoids a crash in the type-checker (verified manually). A test was added here (rather than the type checker) because type- checker tests are shared between types2 and go/types and error recovery in this case is different. Fixes #63835. Change-Id: I1460fc88d23d80b8d8c181c774d6b0a56ca06317 Reviewed-on: https://go-review.googlesource.com/c/go/+/538059 Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Bypass: Robert Griesemer <gri@google.com> Reviewed-by: Robert Griesemer <gri@google.com> Run-TryBot: Robert Griesemer <gri@google.com> Auto-Submit: Robert Griesemer <gri@google.com> |
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Robert Griesemer
|
25a59decd5 |
go/types, types2: more concise error if conversion fails due to integer overflow
This change brings the error message for this case back in line with the pre-Go1.18 error message. Fixes #63563. Change-Id: I3c6587d420907b34ee8a5f295ecb231e9f008380 Reviewed-on: https://go-review.googlesource.com/c/go/+/538058 Auto-Submit: Robert Griesemer <gri@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Robert Griesemer <gri@google.com> Run-TryBot: Robert Griesemer <gri@google.com> TryBot-Bypass: Robert Griesemer <gri@google.com> Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com> |
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Joel Sing
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b6a3c0273e |
cmd/dist,internal/platform: enable openbsd/ppc64 port
Updates #56001 Change-Id: I16440114ecf661e9fc17d304ab3b16bc97ef82f8 Reviewed-on: https://go-review.googlesource.com/c/go/+/517935 Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Paul Murphy <murp@ibm.com> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Carlos Amedee <carlos@golang.org> |
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Jes Cok
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f215a0be4d |
cmd/compile/internal/ssa: add missing space in comment
Change-Id: I54c3e8e0d61ceb6533284098dc32944f9f14459e GitHub-Last-Rev: 9793d9d039911b74396b315ce47ad0a53169d25c GitHub-Pull-Request: golang/go#63806 Reviewed-on: https://go-review.googlesource.com/c/go/+/538375 Reviewed-by: Keith Randall <khr@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: qiulaidongfeng <2645477756@qq.com> Reviewed-by: Bryan Mills <bcmills@google.com> Run-TryBot: qiulaidongfeng <2645477756@qq.com> |
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qiulaidongfeng
|
9c2ab20d48 |
internal/fmtsort: makeChans pin pointer
Complete TODO. For #49431 Change-Id: I1399205e430ebd83182c3e0c4becf1fde32d433e GitHub-Last-Rev: 02cdea740bccbe0993c53fecdd32608f08861e59 GitHub-Pull-Request: golang/go#62673 Reviewed-on: https://go-review.googlesource.com/c/go/+/528796 Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Keith Randall <khr@golang.org> Commit-Queue: Keith Randall <khr@golang.org> Run-TryBot: qiulaidongfeng <2645477756@qq.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Keith Randall <khr@google.com> |
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Quan Tong
|
214ce28503 |
cmd/go/internal/help: update the documentation to match the design and implementation
The existing documentation imply that the build constraints should be ignored after a block comments, but actually it's not. Fixes #63502 Change-Id: I0597934b7a7eeab8908bf06e1312169b3702bf05 Reviewed-on: https://go-review.googlesource.com/c/go/+/535635 Reviewed-by: Michael Matloob <matloob@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Mark Pictor <mark.pictor@contrastsecurity.com> Auto-Submit: Bryan Mills <bcmills@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> |
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Allen Li
|
1e95fc7ffe |
log/slog: Reorder doc comment for level constants
pkgsite and go doc print the doc comment *after* the code, resulting in:
const (
LevelDebug Level = -4
...
)
Many paragraphs...
Names for common levels.
The "Names for common levels." feels out of place and confusing at the bottom.
This is also consistent with the recommendation for the first sentence in doc comments to be the "summary".
Change-Id: I656e85e27d2a4b23eaba5f2c1f4f811a88848c83
GitHub-Last-Rev: d9f7ee9b94df6779fcaef64edf3a480459e3ef16
GitHub-Pull-Request: golang/go#61943
Reviewed-on: https://go-review.googlesource.com/c/go/+/518537
Reviewed-by: Alan Donovan <alan@alandonovan.net>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: qiulaidongfeng <2645477756@qq.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
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Russ Cox
|
8abde68f19 |
math/rand/v2: delete Mitchell/Reeds source
These slowdowns are because we are now using PCG instead of the
Mitchell/Reeds LFSR for the benchmarks. PCG is in fact a bit slower
(but generates statically far better random numbers).
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 01ff938549.amd64 │ afa459a2f0.amd64 │
│ sec/op │ sec/op vs base │
PCG_DXSM-32 1.490n ± 0% 1.488n ± 2% ~ (p=0.408 n=20)
SourceUint64-32 1.352n ± 1% 1.450n ± 3% +7.21% (p=0.000 n=20)
GlobalInt64-32 2.083n ± 0% 2.067n ± 2% ~ (p=0.223 n=20)
GlobalInt64Parallel-32 0.1035n ± 1% 0.1044n ± 2% ~ (p=0.010 n=20)
GlobalUint64-32 2.038n ± 1% 2.085n ± 0% +2.28% (p=0.000 n=20)
GlobalUint64Parallel-32 0.1006n ± 1% 0.1008n ± 1% ~ (p=0.733 n=20)
Int64-32 1.687n ± 2% 1.779n ± 1% +5.48% (p=0.000 n=20)
Uint64-32 1.674n ± 2% 1.854n ± 2% +10.69% (p=0.000 n=20)
GlobalIntN1000-32 3.135n ± 1% 3.140n ± 3% ~ (p=0.794 n=20)
IntN1000-32 2.478n ± 1% 2.496n ± 1% +0.73% (p=0.006 n=20)
Int64N1000-32 2.455n ± 1% 2.510n ± 2% +2.22% (p=0.000 n=20)
Int64N1e8-32 2.467n ± 2% 2.471n ± 2% ~ (p=0.050 n=20)
Int64N1e9-32 2.454n ± 1% 2.488n ± 2% +1.39% (p=0.000 n=20)
Int64N2e9-32 2.482n ± 1% 2.478n ± 2% ~ (p=0.066 n=20)
Int64N1e18-32 3.349n ± 2% 3.088n ± 1% -7.81% (p=0.000 n=20)
Int64N2e18-32 3.537n ± 1% 3.493n ± 1% -1.24% (p=0.002 n=20)
Int64N4e18-32 4.917n ± 0% 5.060n ± 2% +2.91% (p=0.000 n=20)
Int32N1000-32 2.386n ± 1% 2.620n ± 1% +9.76% (p=0.000 n=20)
Int32N1e8-32 2.366n ± 1% 2.652n ± 0% +12.11% (p=0.000 n=20)
Int32N1e9-32 2.355n ± 2% 2.644n ± 1% +12.32% (p=0.000 n=20)
Int32N2e9-32 2.371n ± 1% 2.619n ± 2% +10.48% (p=0.000 n=20)
Float32-32 2.245n ± 2% 2.261n ± 1% ~ (p=0.625 n=20)
Float64-32 2.235n ± 1% 2.241n ± 2% ~ (p=0.393 n=20)
ExpFloat64-32 3.813n ± 3% 3.716n ± 1% -2.53% (p=0.000 n=20)
NormFloat64-32 3.652n ± 2% 3.718n ± 1% +1.79% (p=0.006 n=20)
Perm3-32 33.12n ± 3% 34.11n ± 2% ~ (p=0.021 n=20)
Perm30-32 205.1n ± 1% 200.6n ± 0% -2.17% (p=0.000 n=20)
Perm30ViaShuffle-32 110.8n ± 1% 109.7n ± 1% -0.99% (p=0.002 n=20)
ShuffleOverhead-32 113.0n ± 1% 107.2n ± 1% -5.09% (p=0.000 n=20)
Concurrent-32 2.100n ± 0% 2.108n ± 6% ~ (p=0.103 n=20)
goos: darwin
goarch: arm64
pkg: math/rand/v2
│ 01ff938549.arm64 │ afa459a2f0.arm64 │
│ sec/op │ sec/op vs base │
PCG_DXSM-8 2.531n ± 0% 2.531n ± 0% ~ (p=0.763 n=20)
SourceUint64-8 2.258n ± 1% 2.531n ± 0% +12.09% (p=0.000 n=20)
GlobalInt64-8 2.167n ± 0% 2.177n ± 1% ~ (p=0.213 n=20)
GlobalInt64Parallel-8 0.4310n ± 0% 0.4319n ± 0% ~ (p=0.027 n=20)
GlobalUint64-8 2.182n ± 1% 2.185n ± 1% ~ (p=0.683 n=20)
GlobalUint64Parallel-8 0.4297n ± 0% 0.4295n ± 1% ~ (p=0.941 n=20)
Int64-8 2.472n ± 1% 4.104n ± 0% +66.00% (p=0.000 n=20)
Uint64-8 2.449n ± 1% 4.080n ± 0% +66.60% (p=0.000 n=20)
GlobalIntN1000-8 2.814n ± 2% 2.814n ± 1% ~ (p=0.972 n=20)
IntN1000-8 2.998n ± 2% 4.140n ± 0% +38.09% (p=0.000 n=20)
Int64N1000-8 2.949n ± 2% 4.139n ± 0% +40.35% (p=0.000 n=20)
Int64N1e8-8 2.953n ± 2% 4.140n ± 0% +40.22% (p=0.000 n=20)
Int64N1e9-8 2.950n ± 0% 4.139n ± 0% +40.32% (p=0.000 n=20)
Int64N2e9-8 2.946n ± 2% 4.140n ± 0% +40.53% (p=0.000 n=20)
Int64N1e18-8 3.779n ± 1% 5.273n ± 0% +39.52% (p=0.000 n=20)
Int64N2e18-8 4.370n ± 1% 6.059n ± 0% +38.65% (p=0.000 n=20)
Int64N4e18-8 6.544n ± 1% 8.803n ± 0% +34.52% (p=0.000 n=20)
Int32N1000-8 2.950n ± 0% 4.131n ± 0% +40.06% (p=0.000 n=20)
Int32N1e8-8 2.950n ± 2% 4.131n ± 0% +40.03% (p=0.000 n=20)
Int32N1e9-8 2.951n ± 2% 4.131n ± 0% +39.99% (p=0.000 n=20)
Int32N2e9-8 2.950n ± 2% 4.131n ± 0% +40.03% (p=0.000 n=20)
Float32-8 3.441n ± 0% 4.110n ± 0% +19.44% (p=0.000 n=20)
Float64-8 3.442n ± 0% 4.104n ± 0% +19.24% (p=0.000 n=20)
ExpFloat64-8 4.481n ± 0% 5.338n ± 0% +19.11% (p=0.000 n=20)
NormFloat64-8 4.725n ± 0% 5.731n ± 0% +21.28% (p=0.000 n=20)
Perm3-8 26.55n ± 0% 26.62n ± 0% +0.28% (p=0.000 n=20)
Perm30-8 181.9n ± 0% 194.6n ± 2% +6.98% (p=0.000 n=20)
Perm30ViaShuffle-8 142.9n ± 0% 156.4n ± 0% +9.45% (p=0.000 n=20)
ShuffleOverhead-8 120.8n ± 2% 125.8n ± 0% +4.10% (p=0.000 n=20)
Concurrent-8 2.421n ± 6% 2.654n ± 6% +9.67% (p=0.002 n=20)
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 01ff938549.386 │ afa459a2f0.386 │
│ sec/op │ sec/op vs base │
PCG_DXSM-32 7.613n ± 1% 7.793n ± 2% +2.38% (p=0.000 n=20)
SourceUint64-32 2.069n ± 0% 7.680n ± 1% +271.19% (p=0.000 n=20)
GlobalInt64-32 3.456n ± 1% 3.474n ± 3% ~ (p=0.654 n=20)
GlobalInt64Parallel-32 0.3252n ± 0% 0.3253n ± 0% ~ (p=0.952 n=20)
GlobalUint64-32 3.573n ± 1% 3.433n ± 2% -3.92% (p=0.000 n=20)
GlobalUint64Parallel-32 0.3159n ± 0% 0.3156n ± 0% ~ (p=0.223 n=20)
Int64-32 2.562n ± 2% 7.707n ± 1% +200.74% (p=0.000 n=20)
Uint64-32 2.592n ± 0% 7.714n ± 1% +197.65% (p=0.000 n=20)
GlobalIntN1000-32 6.266n ± 2% 6.236n ± 1% ~ (p=0.039 n=20)
IntN1000-32 4.724n ± 2% 10.410n ± 1% +120.39% (p=0.000 n=20)
Int64N1000-32 5.490n ± 2% 10.975n ± 2% +99.89% (p=0.000 n=20)
Int64N1e8-32 5.513n ± 2% 10.980n ± 1% +99.15% (p=0.000 n=20)
Int64N1e9-32 5.476n ± 1% 10.950n ± 0% +99.96% (p=0.000 n=20)
Int64N2e9-32 5.501n ± 2% 11.110n ± 1% +101.96% (p=0.000 n=20)
Int64N1e18-32 9.043n ± 2% 15.180n ± 2% +67.86% (p=0.000 n=20)
Int64N2e18-32 9.601n ± 2% 15.610n ± 1% +62.60% (p=0.000 n=20)
Int64N4e18-32 12.00n ± 1% 19.23n ± 2% +60.14% (p=0.000 n=20)
Int32N1000-32 4.829n ± 2% 10.345n ± 1% +114.25% (p=0.000 n=20)
Int32N1e8-32 4.825n ± 2% 10.330n ± 1% +114.09% (p=0.000 n=20)
Int32N1e9-32 4.830n ± 2% 10.350n ± 1% +114.26% (p=0.000 n=20)
Int32N2e9-32 4.750n ± 2% 10.345n ± 1% +117.81% (p=0.000 n=20)
Float32-32 10.89n ± 4% 13.57n ± 1% +24.61% (p=0.000 n=20)
Float64-32 19.60n ± 4% 22.95n ± 4% +17.12% (p=0.000 n=20)
ExpFloat64-32 12.96n ± 3% 15.23n ± 2% +17.47% (p=0.000 n=20)
NormFloat64-32 7.516n ± 1% 13.780n ± 1% +83.34% (p=0.000 n=20)
Perm3-32 36.78n ± 2% 46.62n ± 2% +26.72% (p=0.000 n=20)
Perm30-32 238.9n ± 2% 400.7n ± 1% +67.73% (p=0.000 n=20)
Perm30ViaShuffle-32 189.7n ± 2% 350.5n ± 1% +84.79% (p=0.000 n=20)
ShuffleOverhead-32 159.8n ± 1% 326.0n ± 2% +104.01% (p=0.000 n=20)
Concurrent-32 3.286n ± 1% 3.290n ± 0% ~ (p=0.743 n=20)
On the other hand, compared to the original "update benchmarks" CL,
the cleanups we've made more than compensate for PCG being a bit
slower than LFSR, at least on 64-bit x86. ARM64 (Apple M1) is a bit
slower: perhaps the 64x64→128 multiply is slower there for some reason.
386 is noticeably slower, but it's also a non-SSA backend.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 220860f76f.amd64 │ afa459a2f0.amd64 │
│ sec/op │ sec/op vs base │
SourceUint64-32 1.555n ± 1% 1.450n ± 3% -6.78% (p=0.000 n=20)
GlobalInt64-32 2.071n ± 1% 2.067n ± 2% ~ (p=0.673 n=20)
GlobalInt63Parallel-32 0.1023n ± 1%
GlobalInt64Parallel-32 0.1044n ± 2%
GlobalUint64-32 5.193n ± 1% 2.085n ± 0% -59.86% (p=0.000 n=20)
GlobalUint64Parallel-32 0.2341n ± 0% 0.1008n ± 1% -56.93% (p=0.000 n=20)
Int64-32 2.056n ± 2% 1.779n ± 1% -13.47% (p=0.000 n=20)
Uint64-32 2.077n ± 2% 1.854n ± 2% -10.74% (p=0.000 n=20)
GlobalIntN1000-32 4.077n ± 2% 3.140n ± 3% -22.98% (p=0.000 n=20)
IntN1000-32 3.476n ± 2% 2.496n ± 1% -28.19% (p=0.000 n=20)
Int64N1000-32 3.059n ± 1% 2.510n ± 2% -17.96% (p=0.000 n=20)
Int64N1e8-32 2.942n ± 1% 2.471n ± 2% -15.98% (p=0.000 n=20)
Int64N1e9-32 2.932n ± 1% 2.488n ± 2% -15.14% (p=0.000 n=20)
Int64N2e9-32 2.925n ± 1% 2.478n ± 2% -15.30% (p=0.000 n=20)
Int64N1e18-32 3.116n ± 1% 3.088n ± 1% ~ (p=0.013 n=20)
Int64N2e18-32 4.067n ± 1% 3.493n ± 1% -14.11% (p=0.000 n=20)
Int64N4e18-32 4.054n ± 1% 5.060n ± 2% +24.80% (p=0.000 n=20)
Int32N1000-32 2.951n ± 1% 2.620n ± 1% -11.22% (p=0.000 n=20)
Int32N1e8-32 3.102n ± 1% 2.652n ± 0% -14.50% (p=0.000 n=20)
Int32N1e9-32 3.535n ± 1% 2.644n ± 1% -25.20% (p=0.000 n=20)
Int32N2e9-32 3.514n ± 1% 2.619n ± 2% -25.47% (p=0.000 n=20)
Float32-32 2.760n ± 1% 2.261n ± 1% -18.06% (p=0.000 n=20)
Float64-32 2.284n ± 1% 2.241n ± 2% ~ (p=0.016 n=20)
ExpFloat64-32 3.757n ± 1% 3.716n ± 1% ~ (p=0.034 n=20)
NormFloat64-32 3.837n ± 1% 3.718n ± 1% -3.09% (p=0.000 n=20)
Perm3-32 35.23n ± 2% 34.11n ± 2% -3.19% (p=0.000 n=20)
Perm30-32 208.8n ± 1% 200.6n ± 0% -3.93% (p=0.000 n=20)
Perm30ViaShuffle-32 111.7n ± 1% 109.7n ± 1% -1.84% (p=0.000 n=20)
ShuffleOverhead-32 101.1n ± 1% 107.2n ± 1% +6.03% (p=0.000 n=20)
Concurrent-32 2.108n ± 7% 2.108n ± 6% ~ (p=0.644 n=20)
PCG_DXSM-32 1.488n ± 2%
goos: darwin
goarch: arm64
pkg: math/rand/v2
cpu: Apple M1
│ 220860f76f.arm64 │ afa459a2f0.arm64 │
│ sec/op │ sec/op vs base │
SourceUint64-8 2.316n ± 1% 2.531n ± 0% +9.33% (p=0.000 n=20)
GlobalInt64-8 2.183n ± 1% 2.177n ± 1% ~ (p=0.533 n=20)
GlobalInt63Parallel-8 0.4331n ± 0%
GlobalInt64Parallel-8 0.4319n ± 0%
GlobalUint64-8 4.377n ± 2% 2.185n ± 1% -50.07% (p=0.000 n=20)
GlobalUint64Parallel-8 0.9237n ± 0% 0.4295n ± 1% -53.50% (p=0.000 n=20)
Int64-8 2.538n ± 1% 4.104n ± 0% +61.68% (p=0.000 n=20)
Uint64-8 2.604n ± 1% 4.080n ± 0% +56.68% (p=0.000 n=20)
GlobalIntN1000-8 3.857n ± 2% 2.814n ± 1% -27.04% (p=0.000 n=20)
IntN1000-8 3.822n ± 2% 4.140n ± 0% +8.32% (p=0.000 n=20)
Int64N1000-8 3.318n ± 0% 4.139n ± 0% +24.74% (p=0.000 n=20)
Int64N1e8-8 3.349n ± 1% 4.140n ± 0% +23.64% (p=0.000 n=20)
Int64N1e9-8 3.317n ± 2% 4.139n ± 0% +24.80% (p=0.000 n=20)
Int64N2e9-8 3.317n ± 2% 4.140n ± 0% +24.81% (p=0.000 n=20)
Int64N1e18-8 3.542n ± 1% 5.273n ± 0% +48.85% (p=0.000 n=20)
Int64N2e18-8 5.087n ± 0% 6.059n ± 0% +19.12% (p=0.000 n=20)
Int64N4e18-8 5.084n ± 0% 8.803n ± 0% +73.16% (p=0.000 n=20)
Int32N1000-8 3.208n ± 2% 4.131n ± 0% +28.79% (p=0.000 n=20)
Int32N1e8-8 3.610n ± 1% 4.131n ± 0% +14.43% (p=0.000 n=20)
Int32N1e9-8 4.235n ± 0% 4.131n ± 0% -2.44% (p=0.000 n=20)
Int32N2e9-8 4.229n ± 1% 4.131n ± 0% -2.33% (p=0.000 n=20)
Float32-8 3.468n ± 0% 4.110n ± 0% +18.50% (p=0.000 n=20)
Float64-8 3.447n ± 0% 4.104n ± 0% +19.05% (p=0.000 n=20)
ExpFloat64-8 4.567n ± 0% 5.338n ± 0% +16.86% (p=0.000 n=20)
NormFloat64-8 4.821n ± 0% 5.731n ± 0% +18.89% (p=0.000 n=20)
Perm3-8 28.89n ± 0% 26.62n ± 0% -7.84% (p=0.000 n=20)
Perm30-8 175.7n ± 0% 194.6n ± 2% +10.76% (p=0.000 n=20)
Perm30ViaShuffle-8 153.5n ± 0% 156.4n ± 0% +1.86% (p=0.000 n=20)
ShuffleOverhead-8 119.8n ± 1% 125.8n ± 0% +4.97% (p=0.000 n=20)
Concurrent-8 2.433n ± 3% 2.654n ± 6% +9.13% (p=0.001 n=20)
PCG_DXSM-8 2.531n ± 0%
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 220860f76f.386 │ afa459a2f0.386 │
│ sec/op │ sec/op vs base │
SourceUint64-32 2.370n ± 1% 7.680n ± 1% +224.05% (p=0.000 n=20)
GlobalInt64-32 3.569n ± 1% 3.474n ± 3% -2.66% (p=0.001 n=20)
GlobalInt63Parallel-32 0.3221n ± 1%
GlobalInt64Parallel-32 0.3253n ± 0%
GlobalUint64-32 8.797n ± 10% 3.433n ± 2% -60.98% (p=0.000 n=20)
GlobalUint64Parallel-32 0.6351n ± 0% 0.3156n ± 0% -50.31% (p=0.000 n=20)
Int64-32 2.612n ± 2% 7.707n ± 1% +195.04% (p=0.000 n=20)
Uint64-32 3.350n ± 1% 7.714n ± 1% +130.25% (p=0.000 n=20)
GlobalIntN1000-32 5.892n ± 1% 6.236n ± 1% +5.82% (p=0.000 n=20)
IntN1000-32 4.546n ± 1% 10.410n ± 1% +128.97% (p=0.000 n=20)
Int64N1000-32 14.59n ± 1% 10.97n ± 2% -24.75% (p=0.000 n=20)
Int64N1e8-32 14.76n ± 2% 10.98n ± 1% -25.58% (p=0.000 n=20)
Int64N1e9-32 16.57n ± 1% 10.95n ± 0% -33.90% (p=0.000 n=20)
Int64N2e9-32 14.54n ± 1% 11.11n ± 1% -23.62% (p=0.000 n=20)
Int64N1e18-32 16.14n ± 1% 15.18n ± 2% -5.95% (p=0.000 n=20)
Int64N2e18-32 18.10n ± 1% 15.61n ± 1% -13.73% (p=0.000 n=20)
Int64N4e18-32 18.65n ± 1% 19.23n ± 2% +3.08% (p=0.000 n=20)
Int32N1000-32 3.560n ± 1% 10.345n ± 1% +190.55% (p=0.000 n=20)
Int32N1e8-32 3.770n ± 2% 10.330n ± 1% +174.01% (p=0.000 n=20)
Int32N1e9-32 4.098n ± 0% 10.350n ± 1% +152.53% (p=0.000 n=20)
Int32N2e9-32 4.179n ± 1% 10.345n ± 1% +147.52% (p=0.000 n=20)
Float32-32 21.18n ± 4% 13.57n ± 1% -35.93% (p=0.000 n=20)
Float64-32 20.60n ± 2% 22.95n ± 4% +11.41% (p=0.000 n=20)
ExpFloat64-32 13.07n ± 0% 15.23n ± 2% +16.48% (p=0.000 n=20)
NormFloat64-32 7.738n ± 2% 13.780n ± 1% +78.08% (p=0.000 n=20)
Perm3-32 36.73n ± 1% 46.62n ± 2% +26.91% (p=0.000 n=20)
Perm30-32 211.9n ± 1% 400.7n ± 1% +89.05% (p=0.000 n=20)
Perm30ViaShuffle-32 165.2n ± 1% 350.5n ± 1% +112.20% (p=0.000 n=20)
ShuffleOverhead-32 133.9n ± 1% 326.0n ± 2% +143.37% (p=0.000 n=20)
Concurrent-32 3.287n ± 2% 3.290n ± 0% ~ (p=0.365 n=20)
PCG_DXSM-32 7.793n ± 2%
For #61716.
Change-Id: I4e9c0525b5f84a2ac46f23da9e365495e2d05777
Reviewed-on: https://go-review.googlesource.com/c/go/+/502506
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
|
||
|
Russ Cox
|
8631fcbf31 |
math/rand/v2: add PCG-DXSM
For the original math/rand, we ported Plan 9's random number
generator, which was a refinement by Ken Thompson of an algorithm
by Don Mitchell and Jim Reeds, which Mitchell in turn recalls as
having been derived from an algorithm by Marsaglia. At its core,
it is an additive lagged Fibonacci generator (ALFG).
Whatever the details of the history, this generator is nowhere
near the current state of the art for simple, pseudo-random
generators.
This CL adds an implementation of Melissa O'Neill's PCG, specifically
the variant PCG-DXSM, which she defined after writing the PCG paper
and which is now the default in Numpy. The update is slightly slower
(a few multiplies and adds, instead of a few adds), but the state
is dramatically smaller (2 words instead of 607). The statistical
output properties are better too.
A followup CL will delete the old generator.
PCG is the only change here, so no benchmarks should be affected.
Including them anyway as further evidence for caution.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 8993506f2f.amd64 │ 01ff938549.amd64 │
│ sec/op │ sec/op vs base │
SourceUint64-32 1.325n ± 1% 1.352n ± 1% +2.00% (p=0.000 n=20)
GlobalInt64-32 2.240n ± 1% 2.083n ± 0% -7.03% (p=0.000 n=20)
GlobalInt64Parallel-32 0.1041n ± 1% 0.1035n ± 1% ~ (p=0.064 n=20)
GlobalUint64-32 2.072n ± 3% 2.038n ± 1% ~ (p=0.089 n=20)
GlobalUint64Parallel-32 0.1008n ± 1% 0.1006n ± 1% ~ (p=0.804 n=20)
Int64-32 1.716n ± 1% 1.687n ± 2% ~ (p=0.045 n=20)
Uint64-32 1.665n ± 1% 1.674n ± 2% ~ (p=0.878 n=20)
GlobalIntN1000-32 3.335n ± 1% 3.135n ± 1% -6.00% (p=0.000 n=20)
IntN1000-32 2.484n ± 1% 2.478n ± 1% ~ (p=0.085 n=20)
Int64N1000-32 2.502n ± 2% 2.455n ± 1% -1.88% (p=0.002 n=20)
Int64N1e8-32 2.484n ± 2% 2.467n ± 2% ~ (p=0.048 n=20)
Int64N1e9-32 2.502n ± 0% 2.454n ± 1% -1.92% (p=0.000 n=20)
Int64N2e9-32 2.502n ± 0% 2.482n ± 1% -0.76% (p=0.000 n=20)
Int64N1e18-32 3.201n ± 1% 3.349n ± 2% +4.62% (p=0.000 n=20)
Int64N2e18-32 3.504n ± 1% 3.537n ± 1% ~ (p=0.185 n=20)
Int64N4e18-32 4.873n ± 1% 4.917n ± 0% +0.90% (p=0.000 n=20)
Int32N1000-32 2.639n ± 1% 2.386n ± 1% -9.57% (p=0.000 n=20)
Int32N1e8-32 2.686n ± 2% 2.366n ± 1% -11.91% (p=0.000 n=20)
Int32N1e9-32 2.636n ± 1% 2.355n ± 2% -10.70% (p=0.000 n=20)
Int32N2e9-32 2.660n ± 1% 2.371n ± 1% -10.88% (p=0.000 n=20)
Float32-32 2.261n ± 1% 2.245n ± 2% ~ (p=0.752 n=20)
Float64-32 2.280n ± 1% 2.235n ± 1% -1.97% (p=0.007 n=20)
ExpFloat64-32 3.891n ± 1% 3.813n ± 3% ~ (p=0.087 n=20)
NormFloat64-32 3.711n ± 1% 3.652n ± 2% ~ (p=0.021 n=20)
Perm3-32 32.60n ± 2% 33.12n ± 3% ~ (p=0.107 n=20)
Perm30-32 204.2n ± 0% 205.1n ± 1% ~ (p=0.358 n=20)
Perm30ViaShuffle-32 121.7n ± 2% 110.8n ± 1% -8.96% (p=0.000 n=20)
ShuffleOverhead-32 106.2n ± 2% 113.0n ± 1% +6.36% (p=0.000 n=20)
Concurrent-32 2.190n ± 5% 2.100n ± 0% -4.13% (p=0.001 n=20)
PCG_DXSM-32 1.490n ± 0%
goos: darwin
goarch: arm64
pkg: math/rand/v2
cpu: Apple M1
│ 8993506f2f.arm64 │ 01ff938549.arm64 │
│ sec/op │ sec/op vs base │
SourceUint64-8 2.271n ± 0% 2.258n ± 1% ~ (p=0.167 n=20)
GlobalInt64-8 2.161n ± 1% 2.167n ± 0% ~ (p=0.693 n=20)
GlobalInt64Parallel-8 0.4303n ± 0% 0.4310n ± 0% ~ (p=0.051 n=20)
GlobalUint64-8 2.164n ± 1% 2.182n ± 1% ~ (p=0.042 n=20)
GlobalUint64Parallel-8 0.4287n ± 0% 0.4297n ± 0% ~ (p=0.082 n=20)
Int64-8 2.478n ± 1% 2.472n ± 1% ~ (p=0.151 n=20)
Uint64-8 2.460n ± 1% 2.449n ± 1% ~ (p=0.013 n=20)
GlobalIntN1000-8 2.814n ± 2% 2.814n ± 2% ~ (p=0.821 n=20)
IntN1000-8 3.003n ± 2% 2.998n ± 2% ~ (p=0.024 n=20)
Int64N1000-8 2.954n ± 0% 2.949n ± 2% ~ (p=0.192 n=20)
Int64N1e8-8 2.956n ± 0% 2.953n ± 2% ~ (p=0.109 n=20)
Int64N1e9-8 3.325n ± 0% 2.950n ± 0% -11.26% (p=0.000 n=20)
Int64N2e9-8 2.956n ± 2% 2.946n ± 2% ~ (p=0.027 n=20)
Int64N1e18-8 3.780n ± 1% 3.779n ± 1% ~ (p=0.815 n=20)
Int64N2e18-8 4.385n ± 0% 4.370n ± 1% ~ (p=0.402 n=20)
Int64N4e18-8 6.527n ± 0% 6.544n ± 1% ~ (p=0.140 n=20)
Int32N1000-8 2.964n ± 1% 2.950n ± 0% -0.47% (p=0.002 n=20)
Int32N1e8-8 2.964n ± 1% 2.950n ± 2% ~ (p=0.013 n=20)
Int32N1e9-8 2.963n ± 2% 2.951n ± 2% ~ (p=0.062 n=20)
Int32N2e9-8 2.961n ± 2% 2.950n ± 2% -0.37% (p=0.002 n=20)
Float32-8 3.442n ± 0% 3.441n ± 0% ~ (p=0.211 n=20)
Float64-8 3.442n ± 0% 3.442n ± 0% ~ (p=0.067 n=20)
ExpFloat64-8 4.472n ± 0% 4.481n ± 0% +0.20% (p=0.000 n=20)
NormFloat64-8 4.734n ± 0% 4.725n ± 0% -0.19% (p=0.003 n=20)
Perm3-8 26.55n ± 0% 26.55n ± 0% ~ (p=0.833 n=20)
Perm30-8 181.9n ± 0% 181.9n ± 0% -0.03% (p=0.004 n=20)
Perm30ViaShuffle-8 143.1n ± 0% 142.9n ± 0% ~ (p=0.204 n=20)
ShuffleOverhead-8 120.6n ± 1% 120.8n ± 2% ~ (p=0.102 n=20)
Concurrent-8 2.357n ± 2% 2.421n ± 6% ~ (p=0.016 n=20)
PCG_DXSM-8 2.531n ± 0%
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 8993506f2f.386 │ 01ff938549.386 │
│ sec/op │ sec/op vs base │
SourceUint64-32 2.102n ± 2% 2.069n ± 0% ~ (p=0.021 n=20)
GlobalInt64-32 3.542n ± 2% 3.456n ± 1% -2.44% (p=0.001 n=20)
GlobalInt64Parallel-32 0.3202n ± 0% 0.3252n ± 0% +1.56% (p=0.000 n=20)
GlobalUint64-32 3.507n ± 1% 3.573n ± 1% +1.87% (p=0.000 n=20)
GlobalUint64Parallel-32 0.3170n ± 1% 0.3159n ± 0% ~ (p=0.167 n=20)
Int64-32 2.516n ± 1% 2.562n ± 2% ~ (p=0.016 n=20)
Uint64-32 2.544n ± 1% 2.592n ± 0% +1.85% (p=0.000 n=20)
GlobalIntN1000-32 6.237n ± 1% 6.266n ± 2% ~ (p=0.268 n=20)
IntN1000-32 4.670n ± 2% 4.724n ± 2% ~ (p=0.644 n=20)
Int64N1000-32 5.412n ± 1% 5.490n ± 2% ~ (p=0.159 n=20)
Int64N1e8-32 5.414n ± 2% 5.513n ± 2% ~ (p=0.129 n=20)
Int64N1e9-32 5.473n ± 1% 5.476n ± 1% ~ (p=0.723 n=20)
Int64N2e9-32 5.487n ± 1% 5.501n ± 2% ~ (p=0.481 n=20)
Int64N1e18-32 8.901n ± 2% 9.043n ± 2% ~ (p=0.330 n=20)
Int64N2e18-32 9.521n ± 1% 9.601n ± 2% ~ (p=0.703 n=20)
Int64N4e18-32 11.92n ± 1% 12.00n ± 1% ~ (p=0.489 n=20)
Int32N1000-32 4.785n ± 1% 4.829n ± 2% ~ (p=0.402 n=20)
Int32N1e8-32 4.748n ± 1% 4.825n ± 2% ~ (p=0.218 n=20)
Int32N1e9-32 4.810n ± 1% 4.830n ± 2% ~ (p=0.794 n=20)
Int32N2e9-32 4.812n ± 1% 4.750n ± 2% ~ (p=0.057 n=20)
Float32-32 10.48n ± 4% 10.89n ± 4% ~ (p=0.162 n=20)
Float64-32 19.79n ± 3% 19.60n ± 4% ~ (p=0.668 n=20)
ExpFloat64-32 12.91n ± 3% 12.96n ± 3% ~ (p=1.000 n=20)
NormFloat64-32 7.462n ± 1% 7.516n ± 1% ~ (p=0.051 n=20)
Perm3-32 35.98n ± 2% 36.78n ± 2% ~ (p=0.033 n=20)
Perm30-32 241.5n ± 1% 238.9n ± 2% ~ (p=0.126 n=20)
Perm30ViaShuffle-32 187.3n ± 2% 189.7n ± 2% ~ (p=0.387 n=20)
ShuffleOverhead-32 160.2n ± 1% 159.8n ± 1% ~ (p=0.256 n=20)
Concurrent-32 3.308n ± 3% 3.286n ± 1% ~ (p=0.038 n=20)
PCG_DXSM-32 7.613n ± 1%
For #61716.
Change-Id: Icb274ca1f782504d658305a40159b4ae6a2f3f1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/502505
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Rob Pike <r@golang.org>
|
||
|
Russ Cox
|
f2e2637227 |
math/rand/v2: simplify Perm
The compiler says Perm is being inlined into BenchmarkPerm,
and yet BenchmarkPerm30ViaShuffle, which you'd think is the
same code, still runs significantly faster.
The benchmarks are mystifying but this is clearly still a step in
the right direction, since BenchmarkPerm30ViaShuffle is still
the fastest and we avoid having two copies of that logic.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ e1bbe739fb.amd64 │ 8993506f2f.amd64 │
│ sec/op │ sec/op vs base │
SourceUint64-32 1.316n ± 2% 1.325n ± 1% ~ (p=0.208 n=20)
GlobalInt64-32 2.048n ± 1% 2.240n ± 1% +9.38% (p=0.000 n=20)
GlobalInt64Parallel-32 0.1037n ± 1% 0.1041n ± 1% ~ (p=0.774 n=20)
GlobalUint64-32 2.039n ± 2% 2.072n ± 3% ~ (p=0.115 n=20)
GlobalUint64Parallel-32 0.1013n ± 1% 0.1008n ± 1% ~ (p=0.417 n=20)
Int64-32 1.692n ± 2% 1.716n ± 1% ~ (p=0.122 n=20)
Uint64-32 1.643n ± 2% 1.665n ± 1% ~ (p=0.062 n=20)
GlobalIntN1000-32 3.287n ± 1% 3.335n ± 1% ~ (p=0.147 n=20)
IntN1000-32 2.678n ± 2% 2.484n ± 1% -7.24% (p=0.000 n=20)
Int64N1000-32 2.684n ± 2% 2.502n ± 2% -6.80% (p=0.000 n=20)
Int64N1e8-32 2.663n ± 2% 2.484n ± 2% -6.76% (p=0.000 n=20)
Int64N1e9-32 2.633n ± 1% 2.502n ± 0% -4.98% (p=0.000 n=20)
Int64N2e9-32 2.657n ± 1% 2.502n ± 0% -5.87% (p=0.000 n=20)
Int64N1e18-32 3.125n ± 2% 3.201n ± 1% +2.43% (p=0.000 n=20)
Int64N2e18-32 3.476n ± 1% 3.504n ± 1% +0.83% (p=0.009 n=20)
Int64N4e18-32 4.795n ± 1% 4.873n ± 1% ~ (p=0.106 n=20)
Int32N1000-32 2.485n ± 2% 2.639n ± 1% +6.20% (p=0.000 n=20)
Int32N1e8-32 2.457n ± 1% 2.686n ± 2% +9.34% (p=0.000 n=20)
Int32N1e9-32 2.452n ± 1% 2.636n ± 1% +7.52% (p=0.000 n=20)
Int32N2e9-32 2.453n ± 1% 2.660n ± 1% +8.44% (p=0.000 n=20)
Float32-32 2.254n ± 1% 2.261n ± 1% ~ (p=0.888 n=20)
Float64-32 2.262n ± 1% 2.280n ± 1% ~ (p=0.040 n=20)
ExpFloat64-32 3.777n ± 2% 3.891n ± 1% +3.03% (p=0.000 n=20)
NormFloat64-32 3.606n ± 1% 3.711n ± 1% +2.91% (p=0.000 n=20)
Perm3-32 33.12n ± 2% 32.60n ± 2% ~ (p=0.045 n=20)
Perm30-32 176.1n ± 1% 204.2n ± 0% +15.96% (p=0.000 n=20)
Perm30ViaShuffle-32 109.3n ± 1% 121.7n ± 2% +11.30% (p=0.000 n=20)
ShuffleOverhead-32 112.5n ± 1% 106.2n ± 2% -5.56% (p=0.000 n=20)
Concurrent-32 2.099n ± 0% 2.190n ± 5% +4.36% (p=0.001 n=20)
goos: darwin
goarch: arm64
pkg: math/rand/v2
cpu: Apple M1
│ e1bbe739fb.arm64 │ 8993506f2f.arm64 │
│ sec/op │ sec/op vs base │
SourceUint64-8 2.290n ± 1% 2.271n ± 0% ~ (p=0.015 n=20)
GlobalInt64-8 2.180n ± 1% 2.161n ± 1% ~ (p=0.180 n=20)
GlobalInt64Parallel-8 0.4294n ± 0% 0.4303n ± 0% +0.19% (p=0.001 n=20)
GlobalUint64-8 2.170n ± 1% 2.164n ± 1% ~ (p=0.673 n=20)
GlobalUint64Parallel-8 0.4283n ± 0% 0.4287n ± 0% ~ (p=0.128 n=20)
Int64-8 2.481n ± 1% 2.478n ± 1% ~ (p=0.867 n=20)
Uint64-8 2.464n ± 1% 2.460n ± 1% ~ (p=0.763 n=20)
GlobalIntN1000-8 2.814n ± 0% 2.814n ± 2% ~ (p=0.969 n=20)
IntN1000-8 2.934n ± 2% 3.003n ± 2% +2.35% (p=0.000 n=20)
Int64N1000-8 2.957n ± 1% 2.954n ± 0% ~ (p=0.285 n=20)
Int64N1e8-8 2.935n ± 2% 2.956n ± 0% +0.73% (p=0.002 n=20)
Int64N1e9-8 2.935n ± 2% 3.325n ± 0% +13.29% (p=0.000 n=20)
Int64N2e9-8 2.933n ± 4% 2.956n ± 2% ~ (p=0.163 n=20)
Int64N1e18-8 3.781n ± 1% 3.780n ± 1% ~ (p=0.805 n=20)
Int64N2e18-8 4.362n ± 0% 4.385n ± 0% ~ (p=0.077 n=20)
Int64N4e18-8 6.576n ± 1% 6.527n ± 0% ~ (p=0.024 n=20)
Int32N1000-8 2.942n ± 2% 2.964n ± 1% ~ (p=0.073 n=20)
Int32N1e8-8 2.941n ± 1% 2.964n ± 1% ~ (p=0.058 n=20)
Int32N1e9-8 2.938n ± 2% 2.963n ± 2% +0.87% (p=0.003 n=20)
Int32N2e9-8 2.982n ± 2% 2.961n ± 2% ~ (p=0.056 n=20)
Float32-8 3.441n ± 0% 3.442n ± 0% ~ (p=0.030 n=20)
Float64-8 3.441n ± 0% 3.442n ± 0% +0.03% (p=0.001 n=20)
ExpFloat64-8 4.472n ± 0% 4.472n ± 0% ~ (p=0.877 n=20)
NormFloat64-8 4.716n ± 0% 4.734n ± 0% +0.38% (p=0.000 n=20)
Perm3-8 26.66n ± 0% 26.55n ± 0% -0.39% (p=0.000 n=20)
Perm30-8 143.3n ± 0% 181.9n ± 0% +26.97% (p=0.000 n=20)
Perm30ViaShuffle-8 142.9n ± 0% 143.1n ± 0% ~ (p=0.669 n=20)
ShuffleOverhead-8 121.1n ± 1% 120.6n ± 1% -0.41% (p=0.004 n=20)
Concurrent-8 2.379n ± 2% 2.357n ± 2% ~ (p=0.337 n=20)
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ e1bbe739fb.386 │ 8993506f2f.386 │
│ sec/op │ sec/op vs base │
SourceUint64-32 2.087n ± 1% 2.102n ± 2% ~ (p=0.507 n=20)
GlobalInt64-32 3.538n ± 2% 3.542n ± 2% ~ (p=0.425 n=20)
GlobalInt64Parallel-32 0.3207n ± 1% 0.3202n ± 0% ~ (p=0.963 n=20)
GlobalUint64-32 3.543n ± 1% 3.507n ± 1% ~ (p=0.034 n=20)
GlobalUint64Parallel-32 0.3170n ± 0% 0.3170n ± 1% ~ (p=0.920 n=20)
Int64-32 2.548n ± 1% 2.516n ± 1% ~ (p=0.139 n=20)
Uint64-32 2.565n ± 2% 2.544n ± 1% ~ (p=0.394 n=20)
GlobalIntN1000-32 6.300n ± 1% 6.237n ± 1% ~ (p=0.029 n=20)
IntN1000-32 4.750n ± 0% 4.670n ± 2% ~ (p=0.034 n=20)
Int64N1000-32 5.515n ± 2% 5.412n ± 1% -1.86% (p=0.009 n=20)
Int64N1e8-32 5.527n ± 0% 5.414n ± 2% -2.05% (p=0.002 n=20)
Int64N1e9-32 5.531n ± 2% 5.473n ± 1% ~ (p=0.047 n=20)
Int64N2e9-32 5.514n ± 2% 5.487n ± 1% ~ (p=0.298 n=20)
Int64N1e18-32 9.059n ± 1% 8.901n ± 2% ~ (p=0.037 n=20)
Int64N2e18-32 9.594n ± 1% 9.521n ± 1% ~ (p=0.051 n=20)
Int64N4e18-32 12.05n ± 2% 11.92n ± 1% ~ (p=0.357 n=20)
Int32N1000-32 4.840n ± 2% 4.785n ± 1% ~ (p=0.189 n=20)
Int32N1e8-32 4.832n ± 2% 4.748n ± 1% ~ (p=0.042 n=20)
Int32N1e9-32 4.815n ± 2% 4.810n ± 1% ~ (p=0.878 n=20)
Int32N2e9-32 4.813n ± 1% 4.812n ± 1% ~ (p=0.542 n=20)
Float32-32 10.90n ± 2% 10.48n ± 4% -3.85% (p=0.007 n=20)
Float64-32 20.32n ± 4% 19.79n ± 3% ~ (p=0.553 n=20)
ExpFloat64-32 12.95n ± 3% 12.91n ± 3% ~ (p=0.909 n=20)
NormFloat64-32 7.570n ± 1% 7.462n ± 1% -1.44% (p=0.004 n=20)
Perm3-32 37.80n ± 2% 35.98n ± 2% -4.79% (p=0.000 n=20)
Perm30-32 214.0n ± 1% 241.5n ± 1% +12.85% (p=0.000 n=20)
Perm30ViaShuffle-32 188.7n ± 2% 187.3n ± 2% ~ (p=0.029 n=20)
ShuffleOverhead-32 160.8n ± 1% 160.2n ± 1% ~ (p=0.180 n=20)
Concurrent-32 3.288n ± 0% 3.308n ± 3% ~ (p=0.037 n=20)
For #61716.
Change-Id: I342b611456c3569520d3c91c849d29eba325d87e
Reviewed-on: https://go-review.googlesource.com/c/go/+/502504
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Rob Pike <r@golang.org>
|
||
Branden Brown
|
488e2a56b9 |
math/rand/v2: remove bias in ExpFloat64 and NormFloat64
The original implementation of the ziggurat algorithm was designed for
32-bit random integer inputs. This necessitated reusing some low-order
bits for the slice selection and the random coordinate, which introduces
statistical bias. The result is that PractRand consistently fails the
math/rand normal and exponential sequences (transformed to uniform)
within 2 GB of variates.
This change adjusts the ziggurat procedures to use 63-bit random inputs,
so that there is no need to reuse bits between the slice and coordinate.
This is sufficient for the normal sequence to survive to 256 GB of
PractRand testing.
An alternative technique is to recalculate the ziggurats to use 1024
rather than 128 or 256 slices to make full use of 64-bit inputs. This
improves the survival of the normal sequence to far beyond 256 GB and
additionally provides a 6% performance improvement due to the improved
rejection procedure efficiency. However, doing so increases the total
size of the ziggurat tables from 4.5 kB to 48 kB.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 2703446c2e.amd64 │ e1bbe739fb.amd64 │
│ sec/op │ sec/op vs base │
SourceUint64-32 1.337n ± 1% 1.316n ± 2% ~ (p=0.024 n=20)
GlobalInt64-32 2.225n ± 2% 2.048n ± 1% -7.93% (p=0.000 n=20)
GlobalInt64Parallel-32 0.1043n ± 2% 0.1037n ± 1% ~ (p=0.587 n=20)
GlobalUint64-32 2.058n ± 1% 2.039n ± 2% ~ (p=0.030 n=20)
GlobalUint64Parallel-32 0.1009n ± 1% 0.1013n ± 1% ~ (p=0.984 n=20)
Int64-32 1.719n ± 2% 1.692n ± 2% ~ (p=0.085 n=20)
Uint64-32 1.669n ± 1% 1.643n ± 2% ~ (p=0.049 n=20)
GlobalIntN1000-32 3.321n ± 2% 3.287n ± 1% ~ (p=0.298 n=20)
IntN1000-32 2.479n ± 1% 2.678n ± 2% +8.01% (p=0.000 n=20)
Int64N1000-32 2.477n ± 1% 2.684n ± 2% +8.38% (p=0.000 n=20)
Int64N1e8-32 2.490n ± 1% 2.663n ± 2% +6.99% (p=0.000 n=20)
Int64N1e9-32 2.458n ± 1% 2.633n ± 1% +7.12% (p=0.000 n=20)
Int64N2e9-32 2.486n ± 2% 2.657n ± 1% +6.90% (p=0.000 n=20)
Int64N1e18-32 3.215n ± 2% 3.125n ± 2% -2.78% (p=0.000 n=20)
Int64N2e18-32 3.588n ± 2% 3.476n ± 1% -3.15% (p=0.000 n=20)
Int64N4e18-32 4.938n ± 2% 4.795n ± 1% -2.91% (p=0.000 n=20)
Int32N1000-32 2.673n ± 2% 2.485n ± 2% -7.02% (p=0.000 n=20)
Int32N1e8-32 2.631n ± 2% 2.457n ± 1% -6.63% (p=0.000 n=20)
Int32N1e9-32 2.628n ± 2% 2.452n ± 1% -6.70% (p=0.000 n=20)
Int32N2e9-32 2.684n ± 2% 2.453n ± 1% -8.61% (p=0.000 n=20)
Float32-32 2.240n ± 2% 2.254n ± 1% ~ (p=0.878 n=20)
Float64-32 2.253n ± 1% 2.262n ± 1% ~ (p=0.963 n=20)
ExpFloat64-32 3.677n ± 1% 3.777n ± 2% +2.71% (p=0.004 n=20)
NormFloat64-32 3.761n ± 1% 3.606n ± 1% -4.15% (p=0.000 n=20)
Perm3-32 33.55n ± 2% 33.12n ± 2% ~ (p=0.402 n=20)
Perm30-32 173.2n ± 1% 176.1n ± 1% +1.67% (p=0.000 n=20)
Perm30ViaShuffle-32 115.9n ± 1% 109.3n ± 1% -5.69% (p=0.000 n=20)
ShuffleOverhead-32 101.9n ± 1% 112.5n ± 1% +10.35% (p=0.000 n=20)
Concurrent-32 2.107n ± 6% 2.099n ± 0% ~ (p=0.051 n=20)
goos: darwin
goarch: arm64
pkg: math/rand/v2
cpu: Apple M1
│ 2703446c2e.arm64 │ e1bbe739fb.arm64 │
│ sec/op │ sec/op vs base │
SourceUint64-8 2.275n ± 0% 2.290n ± 1% ~ (p=0.044 n=20)
GlobalInt64-8 2.154n ± 1% 2.180n ± 1% ~ (p=0.068 n=20)
GlobalInt64Parallel-8 0.4298n ± 0% 0.4294n ± 0% ~ (p=0.079 n=20)
GlobalUint64-8 2.160n ± 1% 2.170n ± 1% ~ (p=0.129 n=20)
GlobalUint64Parallel-8 0.4286n ± 0% 0.4283n ± 0% ~ (p=0.350 n=20)
Int64-8 2.491n ± 1% 2.481n ± 1% ~ (p=0.330 n=20)
Uint64-8 2.458n ± 0% 2.464n ± 1% ~ (p=0.351 n=20)
GlobalIntN1000-8 2.814n ± 2% 2.814n ± 0% ~ (p=0.325 n=20)
IntN1000-8 2.933n ± 0% 2.934n ± 2% ~ (p=0.079 n=20)
Int64N1000-8 2.962n ± 1% 2.957n ± 1% ~ (p=0.259 n=20)
Int64N1e8-8 2.960n ± 1% 2.935n ± 2% ~ (p=0.276 n=20)
Int64N1e9-8 2.935n ± 2% 2.935n ± 2% ~ (p=0.984 n=20)
Int64N2e9-8 2.934n ± 0% 2.933n ± 4% ~ (p=0.463 n=20)
Int64N1e18-8 3.777n ± 1% 3.781n ± 1% ~ (p=0.516 n=20)
Int64N2e18-8 4.359n ± 1% 4.362n ± 0% ~ (p=0.256 n=20)
Int64N4e18-8 6.536n ± 1% 6.576n ± 1% ~ (p=0.224 n=20)
Int32N1000-8 2.937n ± 0% 2.942n ± 2% ~ (p=0.312 n=20)
Int32N1e8-8 2.937n ± 1% 2.941n ± 1% ~ (p=0.463 n=20)
Int32N1e9-8 2.936n ± 0% 2.938n ± 2% ~ (p=0.044 n=20)
Int32N2e9-8 2.938n ± 2% 2.982n ± 2% ~ (p=0.174 n=20)
Float32-8 3.441n ± 0% 3.441n ± 0% ~ (p=0.064 n=20)
Float64-8 3.441n ± 0% 3.441n ± 0% ~ (p=0.826 n=20)
ExpFloat64-8 4.486n ± 0% 4.472n ± 0% -0.31% (p=0.000 n=20)
NormFloat64-8 4.721n ± 0% 4.716n ± 0% ~ (p=0.051 n=20)
Perm3-8 26.65n ± 0% 26.66n ± 0% ~ (p=0.080 n=20)
Perm30-8 143.2n ± 0% 143.3n ± 0% +0.10% (p=0.000 n=20)
Perm30ViaShuffle-8 143.0n ± 0% 142.9n ± 0% ~ (p=0.642 n=20)
ShuffleOverhead-8 120.6n ± 1% 121.1n ± 1% +0.41% (p=0.010 n=20)
Concurrent-8 2.399n ± 5% 2.379n ± 2% ~ (p=0.365 n=20)
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 2703446c2e.386 │ e1bbe739fb.386 │
│ sec/op │ sec/op vs base │
SourceUint64-32 2.072n ± 2% 2.087n ± 1% ~ (p=0.440 n=20)
GlobalInt64-32 3.546n ± 27% 3.538n ± 2% ~ (p=0.101 n=20)
GlobalInt64Parallel-32 0.3211n ± 0% 0.3207n ± 1% ~ (p=0.753 n=20)
GlobalUint64-32 3.522n ± 2% 3.543n ± 1% ~ (p=0.071 n=20)
GlobalUint64Parallel-32 0.3172n ± 0% 0.3170n ± 0% ~ (p=0.507 n=20)
Int64-32 2.520n ± 2% 2.548n ± 1% ~ (p=0.267 n=20)
Uint64-32 2.581n ± 1% 2.565n ± 2% ~ (p=0.143 n=20)
GlobalIntN1000-32 6.171n ± 1% 6.300n ± 1% ~ (p=0.037 n=20)
IntN1000-32 4.752n ± 2% 4.750n ± 0% ~ (p=0.984 n=20)
Int64N1000-32 5.429n ± 1% 5.515n ± 2% ~ (p=0.292 n=20)
Int64N1e8-32 5.469n ± 2% 5.527n ± 0% ~ (p=0.013 n=20)
Int64N1e9-32 5.489n ± 2% 5.531n ± 2% ~ (p=0.256 n=20)
Int64N2e9-32 5.492n ± 2% 5.514n ± 2% ~ (p=0.606 n=20)
Int64N1e18-32 8.927n ± 1% 9.059n ± 1% ~ (p=0.229 n=20)
Int64N2e18-32 9.622n ± 1% 9.594n ± 1% ~ (p=0.703 n=20)
Int64N4e18-32 12.03n ± 1% 12.05n ± 2% ~ (p=0.733 n=20)
Int32N1000-32 4.817n ± 1% 4.840n ± 2% ~ (p=0.941 n=20)
Int32N1e8-32 4.801n ± 1% 4.832n ± 2% ~ (p=0.228 n=20)
Int32N1e9-32 4.798n ± 1% 4.815n ± 2% ~ (p=0.560 n=20)
Int32N2e9-32 4.840n ± 1% 4.813n ± 1% ~ (p=0.015 n=20)
Float32-32 10.51n ± 4% 10.90n ± 2% +3.71% (p=0.007 n=20)
Float64-32 20.33n ± 3% 20.32n ± 4% ~ (p=0.566 n=20)
ExpFloat64-32 12.59n ± 2% 12.95n ± 3% +2.86% (p=0.002 n=20)
NormFloat64-32 7.350n ± 2% 7.570n ± 1% +2.99% (p=0.007 n=20)
Perm3-32 39.29n ± 2% 37.80n ± 2% -3.79% (p=0.000 n=20)
Perm30-32 219.1n ± 2% 214.0n ± 1% -2.33% (p=0.002 n=20)
Perm30ViaShuffle-32 189.8n ± 2% 188.7n ± 2% ~ (p=0.147 n=20)
ShuffleOverhead-32 158.9n ± 2% 160.8n ± 1% ~ (p=0.176 n=20)
Concurrent-32 3.306n ± 3% 3.288n ± 0% -0.54% (p=0.005 n=20)
For #61716.
Change-Id: I4c5fe710b310dc075ae21c97d1805bcc20db5050
Reviewed-on: https://go-review.googlesource.com/c/go/+/516275
Auto-Submit: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Rob Pike <r@golang.org>
|
||
|
Russ Cox
|
ecda959b99 |
math/rand/v2: optimize Float32, Float64
We realized too late after Go 1 that float64(r.Uint64())/(1<<64)
is not a correct implementation: it occasionally rounds to 1.
The correct implementation is float64(r.Uint64()&(1<<53-1))/(1<<53)
but we couldn't change the implementation for compatibility, so we
changed it to retry only in the "round to 1" cases.
The change to v2 lets us update the algorithm to the simpler,
faster one.
Note that this implementation cannot generate 2⁻⁵⁴, nor 2⁻¹⁰⁰,
nor any of the other numbers between 0 and 2⁻⁵³. A slower algorithm
could shift some of the probability of generating these two boundary
values over to the values in between, but that would be much slower
and not necessarily be better. In particular, the current
implementation has the property that there are uniform gaps between
the possible returned floats, which might help stability. Also, the
result is often scaled and shifted, like Float64()*X+Y. Multiplying by
X>1 would open new gaps, and adding most Y would erase all the
distinctions that were introduced.
The only changes to benchmarks should be in Float32 and Float64.
The other changes remain a cautionary tale.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 4d84a369d1.amd64 │ 2703446c2e.amd64 │
│ sec/op │ sec/op vs base │
SourceUint64-32 1.348n ± 2% 1.337n ± 1% ~ (p=0.662 n=20)
GlobalInt64-32 2.082n ± 2% 2.225n ± 2% +6.87% (p=0.000 n=20)
GlobalInt64Parallel-32 0.1036n ± 1% 0.1043n ± 2% ~ (p=0.171 n=20)
GlobalUint64-32 2.077n ± 2% 2.058n ± 1% ~ (p=0.560 n=20)
GlobalUint64Parallel-32 0.1012n ± 1% 0.1009n ± 1% ~ (p=0.995 n=20)
Int64-32 1.750n ± 0% 1.719n ± 2% -1.74% (p=0.000 n=20)
Uint64-32 1.707n ± 2% 1.669n ± 1% -2.20% (p=0.000 n=20)
GlobalIntN1000-32 3.192n ± 1% 3.321n ± 2% +4.04% (p=0.000 n=20)
IntN1000-32 2.462n ± 2% 2.479n ± 1% ~ (p=0.417 n=20)
Int64N1000-32 2.470n ± 1% 2.477n ± 1% ~ (p=0.664 n=20)
Int64N1e8-32 2.503n ± 2% 2.490n ± 1% ~ (p=0.245 n=20)
Int64N1e9-32 2.487n ± 1% 2.458n ± 1% ~ (p=0.032 n=20)
Int64N2e9-32 2.487n ± 1% 2.486n ± 2% ~ (p=0.507 n=20)
Int64N1e18-32 3.006n ± 2% 3.215n ± 2% +6.94% (p=0.000 n=20)
Int64N2e18-32 3.368n ± 1% 3.588n ± 2% +6.55% (p=0.000 n=20)
Int64N4e18-32 4.763n ± 1% 4.938n ± 2% +3.69% (p=0.000 n=20)
Int32N1000-32 2.403n ± 1% 2.673n ± 2% +11.19% (p=0.000 n=20)
Int32N1e8-32 2.405n ± 1% 2.631n ± 2% +9.42% (p=0.000 n=20)
Int32N1e9-32 2.402n ± 2% 2.628n ± 2% +9.41% (p=0.000 n=20)
Int32N2e9-32 2.384n ± 1% 2.684n ± 2% +12.56% (p=0.000 n=20)
Float32-32 2.641n ± 2% 2.240n ± 2% -15.18% (p=0.000 n=20)
Float64-32 2.483n ± 1% 2.253n ± 1% -9.26% (p=0.000 n=20)
ExpFloat64-32 3.486n ± 2% 3.677n ± 1% +5.49% (p=0.000 n=20)
NormFloat64-32 3.648n ± 1% 3.761n ± 1% +3.11% (p=0.000 n=20)
Perm3-32 33.04n ± 1% 33.55n ± 2% ~ (p=0.180 n=20)
Perm30-32 171.9n ± 1% 173.2n ± 1% ~ (p=0.050 n=20)
Perm30ViaShuffle-32 100.3n ± 1% 115.9n ± 1% +15.55% (p=0.000 n=20)
ShuffleOverhead-32 102.5n ± 1% 101.9n ± 1% ~ (p=0.266 n=20)
Concurrent-32 2.101n ± 0% 2.107n ± 6% ~ (p=0.212 n=20)
goos: darwin
goarch: arm64
pkg: math/rand/v2
cpu: Apple M1
│ 4d84a369d1.arm64 │ 2703446c2e.arm64 │
│ sec/op │ sec/op vs base │
SourceUint64-8 2.261n ± 1% 2.275n ± 0% ~ (p=0.082 n=20)
GlobalInt64-8 2.160n ± 1% 2.154n ± 1% ~ (p=0.490 n=20)
GlobalInt64Parallel-8 0.4299n ± 0% 0.4298n ± 0% ~ (p=0.663 n=20)
GlobalUint64-8 2.169n ± 1% 2.160n ± 1% ~ (p=0.292 n=20)
GlobalUint64Parallel-8 0.4293n ± 1% 0.4286n ± 0% ~ (p=0.155 n=20)
Int64-8 2.473n ± 1% 2.491n ± 1% ~ (p=0.317 n=20)
Uint64-8 2.453n ± 1% 2.458n ± 0% ~ (p=0.941 n=20)
GlobalIntN1000-8 2.814n ± 2% 2.814n ± 2% ~ (p=0.972 n=20)
IntN1000-8 2.933n ± 2% 2.933n ± 0% ~ (p=0.287 n=20)
Int64N1000-8 2.934n ± 2% 2.962n ± 1% ~ (p=0.062 n=20)
Int64N1e8-8 2.935n ± 2% 2.960n ± 1% ~ (p=0.183 n=20)
Int64N1e9-8 2.934n ± 2% 2.935n ± 2% ~ (p=0.367 n=20)
Int64N2e9-8 2.935n ± 2% 2.934n ± 0% ~ (p=0.455 n=20)
Int64N1e18-8 3.778n ± 1% 3.777n ± 1% ~ (p=0.995 n=20)
Int64N2e18-8 4.359n ± 1% 4.359n ± 1% ~ (p=0.122 n=20)
Int64N4e18-8 6.546n ± 1% 6.536n ± 1% ~ (p=0.920 n=20)
Int32N1000-8 2.940n ± 2% 2.937n ± 0% ~ (p=0.149 n=20)
Int32N1e8-8 2.937n ± 2% 2.937n ± 1% ~ (p=0.620 n=20)
Int32N1e9-8 2.938n ± 0% 2.936n ± 0% ~ (p=0.046 n=20)
Int32N2e9-8 2.938n ± 2% 2.938n ± 2% ~ (p=0.455 n=20)
Float32-8 3.486n ± 0% 3.441n ± 0% -1.28% (p=0.000 n=20)
Float64-8 3.480n ± 0% 3.441n ± 0% -1.13% (p=0.000 n=20)
ExpFloat64-8 4.533n ± 0% 4.486n ± 0% -1.03% (p=0.000 n=20)
NormFloat64-8 4.764n ± 0% 4.721n ± 0% -0.90% (p=0.000 n=20)
Perm3-8 26.66n ± 0% 26.65n ± 0% ~ (p=0.019 n=20)
Perm30-8 143.4n ± 0% 143.2n ± 0% -0.17% (p=0.000 n=20)
Perm30ViaShuffle-8 142.9n ± 0% 143.0n ± 0% ~ (p=0.522 n=20)
ShuffleOverhead-8 120.7n ± 0% 120.6n ± 1% ~ (p=0.488 n=20)
Concurrent-8 2.360n ± 2% 2.399n ± 5% ~ (p=0.062 n=20)
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 4d84a369d1.386 │ 2703446c2e.386 │
│ sec/op │ sec/op vs base │
SourceUint64-32 2.101n ± 2% 2.072n ± 2% ~ (p=0.273 n=20)
GlobalInt64-32 3.518n ± 2% 3.546n ± 27% +0.78% (p=0.007 n=20)
GlobalInt64Parallel-32 0.3206n ± 0% 0.3211n ± 0% ~ (p=0.386 n=20)
GlobalUint64-32 3.538n ± 1% 3.522n ± 2% ~ (p=0.331 n=20)
GlobalUint64Parallel-32 0.3231n ± 0% 0.3172n ± 0% -1.84% (p=0.000 n=20)
Int64-32 2.554n ± 2% 2.520n ± 2% ~ (p=0.465 n=20)
Uint64-32 2.575n ± 2% 2.581n ± 1% ~ (p=0.213 n=20)
GlobalIntN1000-32 6.292n ± 1% 6.171n ± 1% ~ (p=0.015 n=20)
IntN1000-32 4.735n ± 1% 4.752n ± 2% ~ (p=0.635 n=20)
Int64N1000-32 5.489n ± 2% 5.429n ± 1% ~ (p=0.324 n=20)
Int64N1e8-32 5.528n ± 2% 5.469n ± 2% ~ (p=0.013 n=20)
Int64N1e9-32 5.438n ± 2% 5.489n ± 2% ~ (p=0.984 n=20)
Int64N2e9-32 5.474n ± 1% 5.492n ± 2% ~ (p=0.616 n=20)
Int64N1e18-32 9.053n ± 1% 8.927n ± 1% ~ (p=0.037 n=20)
Int64N2e18-32 9.685n ± 2% 9.622n ± 1% ~ (p=0.449 n=20)
Int64N4e18-32 12.18n ± 1% 12.03n ± 1% ~ (p=0.013 n=20)
Int32N1000-32 4.862n ± 1% 4.817n ± 1% -0.94% (p=0.002 n=20)
Int32N1e8-32 4.758n ± 2% 4.801n ± 1% ~ (p=0.597 n=20)
Int32N1e9-32 4.772n ± 1% 4.798n ± 1% ~ (p=0.774 n=20)
Int32N2e9-32 4.847n ± 0% 4.840n ± 1% ~ (p=0.867 n=20)
Float32-32 22.18n ± 4% 10.51n ± 4% -52.61% (p=0.000 n=20)
Float64-32 21.21n ± 3% 20.33n ± 3% -4.17% (p=0.000 n=20)
ExpFloat64-32 12.39n ± 2% 12.59n ± 2% ~ (p=0.139 n=20)
NormFloat64-32 7.422n ± 1% 7.350n ± 2% ~ (p=0.208 n=20)
Perm3-32 38.00n ± 2% 39.29n ± 2% +3.38% (p=0.000 n=20)
Perm30-32 212.7n ± 1% 219.1n ± 2% +3.03% (p=0.001 n=20)
Perm30ViaShuffle-32 187.5n ± 2% 189.8n ± 2% ~ (p=0.457 n=20)
ShuffleOverhead-32 159.7n ± 1% 158.9n ± 2% ~ (p=0.920 n=20)
Concurrent-32 3.470n ± 0% 3.306n ± 3% -4.71% (p=0.000 n=20)
For #61716.
Change-Id: I1933f1f9efd7e6e832d83e7fa5d84398f67d41f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/502503
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
|
||
|
Russ Cox
|
c266587846 |
math/rand/v2: add, optimize N, UintN, Uint32N, Uint64N
Now that we can break the value stream, we can take advantage
of better algorithms that have been suggested since the original
code was written.
Also optimizes IntN, Int32N, Int64N, Perm (indirectly).
All the N variants (IntN, Int32N, Int64N, UintN, N, etc) now
return the same values given a Source and parameter n, so that
for example uint(r.IntN(10)) and r.UintN(10) and r.N(uint(10))
are completely interchangeable.
Int64N4e18 gets slower but that is a near worst case for
the algorithm and is extremely unlikely in practice.
32-bit Int32N variants got slower too, by 15-30%, in exchange
for speeding up everything on 64-bit systems and consistency
across the N functions.
Also rename previously missed benchmark
GlobalInt63Parallel to GlobalInt64Parallel.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 11ad9fdddc.amd64 │ 4d84a369d1.amd64 │
│ sec/op │ sec/op vs base │
SourceUint64-32 1.335n ± 1% 1.348n ± 2% ~ (p=0.335 n=20)
GlobalInt64-32 2.046n ± 1% 2.082n ± 2% ~ (p=0.310 n=20)
GlobalInt63Parallel-32 0.1037n ± 1%
GlobalInt64Parallel-32 0.1036n ± 1%
GlobalUint64-32 2.075n ± 0% 2.077n ± 2% ~ (p=0.228 n=20)
GlobalUint64Parallel-32 0.1013n ± 1% 0.1012n ± 1% ~ (p=0.878 n=20)
Int64-32 1.726n ± 2% 1.750n ± 0% +1.39% (p=0.000 n=20)
Uint64-32 1.673n ± 1% 1.707n ± 2% +2.03% (p=0.002 n=20)
GlobalIntN1000-32 3.895n ± 2% 3.192n ± 1% -18.05% (p=0.000 n=20)
IntN1000-32 3.403n ± 1% 2.462n ± 2% -27.65% (p=0.000 n=20)
Int64N1000-32 3.053n ± 2% 2.470n ± 1% -19.11% (p=0.000 n=20)
Int64N1e8-32 2.718n ± 1% 2.503n ± 2% -7.91% (p=0.000 n=20)
Int64N1e9-32 2.712n ± 1% 2.487n ± 1% -8.31% (p=0.000 n=20)
Int64N2e9-32 2.690n ± 1% 2.487n ± 1% -7.57% (p=0.000 n=20)
Int64N1e18-32 3.084n ± 2% 3.006n ± 2% -2.53% (p=0.000 n=20)
Int64N2e18-32 4.026n ± 1% 3.368n ± 1% -16.33% (p=0.000 n=20)
Int64N4e18-32 4.049n ± 2% 4.763n ± 1% +17.62% (p=0.000 n=20)
Int32N1000-32 2.730n ± 0% 2.403n ± 1% -11.94% (p=0.000 n=20)
Int32N1e8-32 2.916n ± 2% 2.405n ± 1% -17.53% (p=0.000 n=20)
Int32N1e9-32 3.375n ± 1% 2.402n ± 2% -28.83% (p=0.000 n=20)
Int32N2e9-32 3.292n ± 1% 2.384n ± 1% -27.58% (p=0.000 n=20)
Float32-32 2.673n ± 1% 2.641n ± 2% ~ (p=0.147 n=20)
Float64-32 2.485n ± 1% 2.483n ± 1% ~ (p=0.804 n=20)
ExpFloat64-32 3.577n ± 2% 3.486n ± 2% -2.57% (p=0.000 n=20)
NormFloat64-32 3.797n ± 2% 3.648n ± 1% -3.92% (p=0.000 n=20)
Perm3-32 35.79n ± 2% 33.04n ± 1% -7.68% (p=0.000 n=20)
Perm30-32 205.1n ± 1% 171.9n ± 1% -16.14% (p=0.000 n=20)
Perm30ViaShuffle-32 111.2n ± 2% 100.3n ± 1% -9.76% (p=0.000 n=20)
ShuffleOverhead-32 100.5n ± 2% 102.5n ± 1% +1.99% (p=0.007 n=20)
Concurrent-32 2.188n ± 5% 2.101n ± 0% ~ (p=0.013 n=20)
goos: darwin
goarch: arm64
pkg: math/rand/v2
cpu: Apple M1
│ 11ad9fdddc.arm64 │ 4d84a369d1.arm64 │
│ sec/op │ sec/op vs base │
SourceUint64-8 2.272n ± 1% 2.261n ± 1% ~ (p=0.172 n=20)
GlobalInt64-8 2.155n ± 1% 2.160n ± 1% ~ (p=0.482 n=20)
GlobalInt63Parallel-8 0.4352n ± 0%
GlobalInt64Parallel-8 0.4299n ± 0%
GlobalUint64-8 2.173n ± 1% 2.169n ± 1% ~ (p=0.262 n=20)
GlobalUint64Parallel-8 0.4340n ± 0% 0.4293n ± 1% -1.08% (p=0.000 n=20)
Int64-8 2.544n ± 1% 2.473n ± 1% -2.83% (p=0.000 n=20)
Uint64-8 2.552n ± 1% 2.453n ± 1% -3.90% (p=0.000 n=20)
GlobalIntN1000-8 3.856n ± 0% 2.814n ± 2% -27.02% (p=0.000 n=20)
IntN1000-8 3.820n ± 0% 2.933n ± 2% -23.22% (p=0.000 n=20)
Int64N1000-8 3.219n ± 2% 2.934n ± 2% -8.85% (p=0.000 n=20)
Int64N1e8-8 3.221n ± 2% 2.935n ± 2% -8.91% (p=0.000 n=20)
Int64N1e9-8 3.276n ± 2% 2.934n ± 2% -10.44% (p=0.000 n=20)
Int64N2e9-8 3.217n ± 0% 2.935n ± 2% -8.78% (p=0.000 n=20)
Int64N1e18-8 3.502n ± 2% 3.778n ± 1% +7.91% (p=0.000 n=20)
Int64N2e18-8 4.968n ± 1% 4.359n ± 1% -12.26% (p=0.000 n=20)
Int64N4e18-8 4.963n ± 0% 6.546n ± 1% +31.92% (p=0.000 n=20)
Int32N1000-8 3.189n ± 1% 2.940n ± 2% -7.81% (p=0.000 n=20)
Int32N1e8-8 3.514n ± 1% 2.937n ± 2% -16.41% (p=0.000 n=20)
Int32N1e9-8 4.133n ± 0% 2.938n ± 0% -28.91% (p=0.000 n=20)
Int32N2e9-8 4.137n ± 0% 2.938n ± 2% -28.97% (p=0.000 n=20)
Float32-8 3.468n ± 1% 3.486n ± 0% +0.52% (p=0.000 n=20)
Float64-8 3.478n ± 0% 3.480n ± 0% ~ (p=0.063 n=20)
ExpFloat64-8 4.563n ± 0% 4.533n ± 0% -0.67% (p=0.000 n=20)
NormFloat64-8 4.768n ± 0% 4.764n ± 0% -0.07% (p=0.001 n=20)
Perm3-8 28.94n ± 0% 26.66n ± 0% -7.88% (p=0.000 n=20)
Perm30-8 175.9n ± 0% 143.4n ± 0% -18.50% (p=0.000 n=20)
Perm30ViaShuffle-8 152.6n ± 1% 142.9n ± 0% -6.29% (p=0.000 n=20)
ShuffleOverhead-8 119.6n ± 1% 120.7n ± 0% +0.96% (p=0.000 n=20)
Concurrent-8 2.452n ± 3% 2.360n ± 2% -3.73% (p=0.007 n=20)
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 11ad9fdddc.386 │ 4d84a369d1.386 │
│ sec/op │ sec/op vs base │
SourceUint64-32 2.091n ± 1% 2.101n ± 2% ~ (p=0.672 n=20)
GlobalInt64-32 3.514n ± 2% 3.518n ± 2% ~ (p=0.723 n=20)
GlobalInt63Parallel-32 0.3197n ± 0%
GlobalInt64Parallel-32 0.3206n ± 0%
GlobalUint64-32 3.542n ± 1% 3.538n ± 1% ~ (p=0.304 n=20)
GlobalUint64Parallel-32 0.3218n ± 0% 0.3231n ± 0% ~ (p=0.071 n=20)
Int64-32 2.552n ± 2% 2.554n ± 2% ~ (p=0.693 n=20)
Uint64-32 2.566n ± 1% 2.575n ± 2% ~ (p=0.606 n=20)
GlobalIntN1000-32 5.965n ± 2% 6.292n ± 1% +5.46% (p=0.000 n=20)
IntN1000-32 4.652n ± 1% 4.735n ± 1% +1.77% (p=0.000 n=20)
Int64N1000-32 14.485n ± 1% 5.489n ± 2% -62.11% (p=0.000 n=20)
Int64N1e8-32 14.675n ± 1% 5.528n ± 2% -62.33% (p=0.000 n=20)
Int64N1e9-32 16.805n ± 2% 5.438n ± 2% -67.64% (p=0.000 n=20)
Int64N2e9-32 14.515n ± 1% 5.474n ± 1% -62.28% (p=0.000 n=20)
Int64N1e18-32 16.165n ± 1% 9.053n ± 1% -44.00% (p=0.000 n=20)
Int64N2e18-32 17.945n ± 2% 9.685n ± 2% -46.03% (p=0.000 n=20)
Int64N4e18-32 18.35n ± 2% 12.18n ± 1% -33.62% (p=0.000 n=20)
Int32N1000-32 3.608n ± 1% 4.862n ± 1% +34.77% (p=0.000 n=20)
Int32N1e8-32 3.767n ± 1% 4.758n ± 2% +26.31% (p=0.000 n=20)
Int32N1e9-32 4.130n ± 2% 4.772n ± 1% +15.54% (p=0.000 n=20)
Int32N2e9-32 4.206n ± 1% 4.847n ± 0% +15.24% (p=0.000 n=20)
Float32-32 22.18n ± 4% 22.18n ± 4% ~ (p=0.195 n=20)
Float64-32 20.75n ± 4% 21.21n ± 3% ~ (p=0.394 n=20)
ExpFloat64-32 12.58n ± 3% 12.39n ± 2% ~ (p=0.032 n=20)
NormFloat64-32 7.920n ± 3% 7.422n ± 1% -6.29% (p=0.000 n=20)
Perm3-32 40.27n ± 1% 38.00n ± 2% -5.65% (p=0.000 n=20)
Perm30-32 213.2n ± 2% 212.7n ± 1% ~ (p=0.995 n=20)
Perm30ViaShuffle-32 164.2n ± 2% 187.5n ± 2% +14.22% (p=0.000 n=20)
ShuffleOverhead-32 134.7n ± 2% 159.7n ± 1% +18.52% (p=0.000 n=20)
Concurrent-32 3.301n ± 2% 3.470n ± 0% +5.10% (p=0.000 n=20)
For #61716.
Change-Id: Id1481b04202883cd0b23e21bb58d1bca4e482bd3
Reviewed-on: https://go-review.googlesource.com/c/go/+/502500
Reviewed-by: Rob Pike <r@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
|
||
|
Russ Cox
|
c7dddb02d3 |
math/rand/v2: change Source to use uint64
This should make Uint64-using functions faster and leave
other things alone. It is a mystery why so much got faster.
A good cautionary tale not to read too much into minor
jitter in the benchmarks.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 220860f76f.amd64 │ 11ad9fdddc.amd64 │
│ sec/op │ sec/op vs base │
SourceUint64-32 1.555n ± 1% 1.335n ± 1% -14.15% (p=0.000 n=20)
GlobalInt64-32 2.071n ± 1% 2.046n ± 1% ~ (p=0.016 n=20)
GlobalInt63Parallel-32 0.1023n ± 1% 0.1037n ± 1% +1.37% (p=0.002 n=20)
GlobalUint64-32 5.193n ± 1% 2.075n ± 0% -60.06% (p=0.000 n=20)
GlobalUint64Parallel-32 0.2341n ± 0% 0.1013n ± 1% -56.74% (p=0.000 n=20)
Int64-32 2.056n ± 2% 1.726n ± 2% -16.10% (p=0.000 n=20)
Uint64-32 2.077n ± 2% 1.673n ± 1% -19.46% (p=0.000 n=20)
GlobalIntN1000-32 4.077n ± 2% 3.895n ± 2% -4.45% (p=0.000 n=20)
IntN1000-32 3.476n ± 2% 3.403n ± 1% -2.10% (p=0.000 n=20)
Int64N1000-32 3.059n ± 1% 3.053n ± 2% ~ (p=0.131 n=20)
Int64N1e8-32 2.942n ± 1% 2.718n ± 1% -7.60% (p=0.000 n=20)
Int64N1e9-32 2.932n ± 1% 2.712n ± 1% -7.50% (p=0.000 n=20)
Int64N2e9-32 2.925n ± 1% 2.690n ± 1% -8.03% (p=0.000 n=20)
Int64N1e18-32 3.116n ± 1% 3.084n ± 2% ~ (p=0.425 n=20)
Int64N2e18-32 4.067n ± 1% 4.026n ± 1% -1.02% (p=0.007 n=20)
Int64N4e18-32 4.054n ± 1% 4.049n ± 2% ~ (p=0.204 n=20)
Int32N1000-32 2.951n ± 1% 2.730n ± 0% -7.49% (p=0.000 n=20)
Int32N1e8-32 3.102n ± 1% 2.916n ± 2% -6.03% (p=0.000 n=20)
Int32N1e9-32 3.535n ± 1% 3.375n ± 1% -4.54% (p=0.000 n=20)
Int32N2e9-32 3.514n ± 1% 3.292n ± 1% -6.30% (p=0.000 n=20)
Float32-32 2.760n ± 1% 2.673n ± 1% -3.13% (p=0.000 n=20)
Float64-32 2.284n ± 1% 2.485n ± 1% +8.80% (p=0.000 n=20)
ExpFloat64-32 3.757n ± 1% 3.577n ± 2% -4.78% (p=0.000 n=20)
NormFloat64-32 3.837n ± 1% 3.797n ± 2% ~ (p=0.204 n=20)
Perm3-32 35.23n ± 2% 35.79n ± 2% ~ (p=0.298 n=20)
Perm30-32 208.8n ± 1% 205.1n ± 1% -1.82% (p=0.000 n=20)
Perm30ViaShuffle-32 111.7n ± 1% 111.2n ± 2% ~ (p=0.273 n=20)
ShuffleOverhead-32 101.1n ± 1% 100.5n ± 2% ~ (p=0.878 n=20)
Concurrent-32 2.108n ± 7% 2.188n ± 5% ~ (p=0.417 n=20)
goos: darwin
goarch: arm64
pkg: math/rand/v2
│ 220860f76f.arm64 │ 11ad9fdddc.arm64 │
│ sec/op │ sec/op vs base │
SourceUint64-8 2.316n ± 1% 2.272n ± 1% -1.86% (p=0.000 n=20)
GlobalInt64-8 2.183n ± 1% 2.155n ± 1% ~ (p=0.122 n=20)
GlobalInt63Parallel-8 0.4331n ± 0% 0.4352n ± 0% +0.48% (p=0.000 n=20)
GlobalUint64-8 4.377n ± 2% 2.173n ± 1% -50.35% (p=0.000 n=20)
GlobalUint64Parallel-8 0.9237n ± 0% 0.4340n ± 0% -53.02% (p=0.000 n=20)
Int64-8 2.538n ± 1% 2.544n ± 1% ~ (p=0.189 n=20)
Uint64-8 2.604n ± 1% 2.552n ± 1% -1.98% (p=0.000 n=20)
GlobalIntN1000-8 3.857n ± 2% 3.856n ± 0% ~ (p=0.051 n=20)
IntN1000-8 3.822n ± 2% 3.820n ± 0% -0.05% (p=0.001 n=20)
Int64N1000-8 3.318n ± 0% 3.219n ± 2% -2.98% (p=0.000 n=20)
Int64N1e8-8 3.349n ± 1% 3.221n ± 2% -3.79% (p=0.000 n=20)
Int64N1e9-8 3.317n ± 2% 3.276n ± 2% -1.24% (p=0.001 n=20)
Int64N2e9-8 3.317n ± 2% 3.217n ± 0% -3.01% (p=0.000 n=20)
Int64N1e18-8 3.542n ± 1% 3.502n ± 2% -1.16% (p=0.001 n=20)
Int64N2e18-8 5.087n ± 0% 4.968n ± 1% -2.33% (p=0.000 n=20)
Int64N4e18-8 5.084n ± 0% 4.963n ± 0% -2.39% (p=0.000 n=20)
Int32N1000-8 3.208n ± 2% 3.189n ± 1% -0.58% (p=0.001 n=20)
Int32N1e8-8 3.610n ± 1% 3.514n ± 1% -2.67% (p=0.000 n=20)
Int32N1e9-8 4.235n ± 0% 4.133n ± 0% -2.40% (p=0.000 n=20)
Int32N2e9-8 4.229n ± 1% 4.137n ± 0% -2.19% (p=0.000 n=20)
Float32-8 3.468n ± 0% 3.468n ± 1% ~ (p=0.350 n=20)
Float64-8 3.447n ± 0% 3.478n ± 0% +0.90% (p=0.000 n=20)
ExpFloat64-8 4.567n ± 0% 4.563n ± 0% -0.10% (p=0.002 n=20)
NormFloat64-8 4.821n ± 0% 4.768n ± 0% -1.09% (p=0.000 n=20)
Perm3-8 28.89n ± 0% 28.94n ± 0% +0.17% (p=0.000 n=20)
Perm30-8 175.7n ± 0% 175.9n ± 0% +0.14% (p=0.000 n=20)
Perm30ViaShuffle-8 153.5n ± 0% 152.6n ± 1% ~ (p=0.010 n=20)
ShuffleOverhead-8 119.8n ± 1% 119.6n ± 1% ~ (p=0.147 n=20)
Concurrent-8 2.433n ± 3% 2.452n ± 3% ~ (p=0.616 n=20)
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 220860f76f.386 │ 11ad9fdddc.386 │
│ sec/op │ sec/op vs base │
SourceUint64-32 2.370n ± 1% 2.091n ± 1% -11.75% (p=0.000 n=20)
GlobalInt64-32 3.569n ± 1% 3.514n ± 2% -1.56% (p=0.000 n=20)
GlobalInt63Parallel-32 0.3221n ± 1% 0.3197n ± 0% -0.76% (p=0.000 n=20)
GlobalUint64-32 8.797n ± 10% 3.542n ± 1% -59.74% (p=0.000 n=20)
GlobalUint64Parallel-32 0.6351n ± 0% 0.3218n ± 0% -49.33% (p=0.000 n=20)
Int64-32 2.612n ± 2% 2.552n ± 2% -2.30% (p=0.000 n=20)
Uint64-32 3.350n ± 1% 2.566n ± 1% -23.42% (p=0.000 n=20)
GlobalIntN1000-32 5.892n ± 1% 5.965n ± 2% ~ (p=0.082 n=20)
IntN1000-32 4.546n ± 1% 4.652n ± 1% +2.33% (p=0.000 n=20)
Int64N1000-32 14.59n ± 1% 14.48n ± 1% ~ (p=0.652 n=20)
Int64N1e8-32 14.76n ± 2% 14.67n ± 1% ~ (p=0.836 n=20)
Int64N1e9-32 16.57n ± 1% 16.80n ± 2% ~ (p=0.016 n=20)
Int64N2e9-32 14.54n ± 1% 14.52n ± 1% ~ (p=0.533 n=20)
Int64N1e18-32 16.14n ± 1% 16.16n ± 1% ~ (p=0.606 n=20)
Int64N2e18-32 18.10n ± 1% 17.95n ± 2% ~ (p=0.062 n=20)
Int64N4e18-32 18.65n ± 1% 18.35n ± 2% -1.61% (p=0.010 n=20)
Int32N1000-32 3.560n ± 1% 3.608n ± 1% +1.33% (p=0.001 n=20)
Int32N1e8-32 3.770n ± 2% 3.767n ± 1% ~ (p=0.155 n=20)
Int32N1e9-32 4.098n ± 0% 4.130n ± 2% ~ (p=0.016 n=20)
Int32N2e9-32 4.179n ± 1% 4.206n ± 1% ~ (p=0.011 n=20)
Float32-32 21.18n ± 4% 22.18n ± 4% +4.70% (p=0.003 n=20)
Float64-32 20.60n ± 2% 20.75n ± 4% +0.73% (p=0.000 n=20)
ExpFloat64-32 13.07n ± 0% 12.58n ± 3% -3.82% (p=0.000 n=20)
NormFloat64-32 7.738n ± 2% 7.920n ± 3% ~ (p=0.066 n=20)
Perm3-32 36.73n ± 1% 40.27n ± 1% +9.65% (p=0.000 n=20)
Perm30-32 211.9n ± 1% 213.2n ± 2% ~ (p=0.262 n=20)
Perm30ViaShuffle-32 165.2n ± 1% 164.2n ± 2% ~ (p=0.029 n=20)
ShuffleOverhead-32 133.9n ± 1% 134.7n ± 2% ~ (p=0.551 n=20)
Concurrent-32 3.287n ± 2% 3.301n ± 2% ~ (p=0.330 n=20)
For #61716.
Change-Id: I8d2f73f87dd3603a0c2ff069988938e0957b6904
Reviewed-on: https://go-review.googlesource.com/c/go/+/502499
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Rob Pike <r@golang.org>
|
||
Ubuntu
|
8fc043ccfa |
cmd/compile: optimize right shifts of int32 on riscv64
The compiler is currently sign extending 32 bit signed integers to
64 bits before right shifting them using a 64 bit shift instruction.
There's no need to do this as RISC-V has instructions for right
shifting 32 bit signed values (sraw and sraiw) which sign extend
the result of the shift to 64 bits. Change the compiler so that
it uses sraw and sraiw for shifts of signed 32 bit integers reducing
in most cases the number of instructions needed to perform the shift.
Here are some examples of code sequences that are changed by this
patch:
int32(a) >> 2
before:
sll x5,x10,0x20
sra x10,x5,0x22
after:
sraw x10,x10,0x2
int32(v) >> int(s)
before:
sext.w x5,x10
sltiu x6,x11,64
add x6,x6,-1
or x6,x11,x6
sra x10,x5,x6
after:
sltiu x5,x11,32
add x5,x5,-1
or x5,x11,x5
sraw x10,x10,x5
int32(v) >> (int(s) & 31)
before:
sext.w x5,x10
and x6,x11,63
sra x10,x5,x6
after:
and x5,x11,31
sraw x10,x10,x5
int32(100) >> int(a)
before:
bltz x10,<target address calls runtime.panicshift>
sltiu x5,x10,64
add x5,x5,-1
or x5,x10,x5
li x6,100
sra x10,x6,x5
after:
bltz x10,<target address calls runtime.panicshift>
sltiu x5,x10,32
add x5,x5,-1
or x5,x10,x5
li x6,100
sraw x10,x6,x5
int32(v) >> (int(s) & 63)
before:
sext.w x5,x10
and x6,x11,63
sra x10,x5,x6
after:
and x5,x11,63
sltiu x6,x5,32
add x6,x6,-1
or x5,x5,x6
sraw x10,x10,x5
In most cases we eliminate one instruction. In the case where
we shift a int32 constant by a variable the number of instructions
generated is identical. A sra is simply replaced by a sraw. In the
unusual case where we shift right by a variable anded with a constant
> 31 but < 64, we generate two additional instructions. As this is
an unusual case we do not try to optimize for it.
Some improvements can be seen in some of the existing benchmarks,
notably in the utf8 package which performs right shifts of runes
which are signed 32 bit integers.
| utf8-old | utf8-new |
| sec/op | sec/op vs base |
EncodeASCIIRune-4 17.68n ± 0% 17.67n ± 0% ~ (p=0.312 n=10)
EncodeJapaneseRune-4 35.34n ± 0% 34.53n ± 1% -2.31% (p=0.000 n=10)
AppendASCIIRune-4 3.213n ± 0% 3.213n ± 0% ~ (p=0.318 n=10)
AppendJapaneseRune-4 36.14n ± 0% 35.35n ± 0% -2.19% (p=0.000 n=10)
DecodeASCIIRune-4 28.11n ± 0% 27.36n ± 0% -2.69% (p=0.000 n=10)
DecodeJapaneseRune-4 38.55n ± 0% 38.58n ± 0% ~ (p=0.612 n=10)
Change-Id: I60a91cbede9ce65597571c7b7dd9943eeb8d3cc2
Reviewed-on: https://go-review.googlesource.com/c/go/+/535115
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: M Zhuo <mzh@golangcn.org>
Reviewed-by: David Chase <drchase@google.com>
|
||
|
Russ Cox
|
1f4db9dbd6 |
math/rand/v2: update benchmarks
Change the benchmarks to use the result of the calls,
as I found that in certain cases inlining resulted in
discarding part of the computation in the benchmark loop.
Add various benchmarks that will be relevant in future CLs.
goos: linux
goarch: amd64
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 220860f76f.amd64 │
│ sec/op │
SourceUint64-32 1.555n ± 1%
GlobalInt64-32 2.071n ± 1%
GlobalInt63Parallel-32 0.1023n ± 1%
GlobalUint64-32 5.193n ± 1%
GlobalUint64Parallel-32 0.2341n ± 0%
Int64-32 2.056n ± 2%
Uint64-32 2.077n ± 2%
GlobalIntN1000-32 4.077n ± 2%
IntN1000-32 3.476n ± 2%
Int64N1000-32 3.059n ± 1%
Int64N1e8-32 2.942n ± 1%
Int64N1e9-32 2.932n ± 1%
Int64N2e9-32 2.925n ± 1%
Int64N1e18-32 3.116n ± 1%
Int64N2e18-32 4.067n ± 1%
Int64N4e18-32 4.054n ± 1%
Int32N1000-32 2.951n ± 1%
Int32N1e8-32 3.102n ± 1%
Int32N1e9-32 3.535n ± 1%
Int32N2e9-32 3.514n ± 1%
Float32-32 2.760n ± 1%
Float64-32 2.284n ± 1%
ExpFloat64-32 3.757n ± 1%
NormFloat64-32 3.837n ± 1%
Perm3-32 35.23n ± 2%
Perm30-32 208.8n ± 1%
Perm30ViaShuffle-32 111.7n ± 1%
ShuffleOverhead-32 101.1n ± 1%
Concurrent-32 2.108n ± 7%
goos: darwin
goarch: arm64
pkg: math/rand/v2
cpu: Apple M1
│ 220860f76f.arm64 │
│ sec/op │
SourceUint64-8 2.316n ± 1%
GlobalInt64-8 2.183n ± 1%
GlobalInt63Parallel-8 0.4331n ± 0%
GlobalUint64-8 4.377n ± 2%
GlobalUint64Parallel-8 0.9237n ± 0%
Int64-8 2.538n ± 1%
Uint64-8 2.604n ± 1%
GlobalIntN1000-8 3.857n ± 2%
IntN1000-8 3.822n ± 2%
Int64N1000-8 3.318n ± 0%
Int64N1e8-8 3.349n ± 1%
Int64N1e9-8 3.317n ± 2%
Int64N2e9-8 3.317n ± 2%
Int64N1e18-8 3.542n ± 1%
Int64N2e18-8 5.087n ± 0%
Int64N4e18-8 5.084n ± 0%
Int32N1000-8 3.208n ± 2%
Int32N1e8-8 3.610n ± 1%
Int32N1e9-8 4.235n ± 0%
Int32N2e9-8 4.229n ± 1%
Float32-8 3.468n ± 0%
Float64-8 3.447n ± 0%
ExpFloat64-8 4.567n ± 0%
NormFloat64-8 4.821n ± 0%
Perm3-8 28.89n ± 0%
Perm30-8 175.7n ± 0%
Perm30ViaShuffle-8 153.5n ± 0%
ShuffleOverhead-8 119.8n ± 1%
Concurrent-8 2.433n ± 3%
goos: linux
goarch: 386
pkg: math/rand/v2
cpu: AMD Ryzen 9 7950X 16-Core Processor
│ 220860f76f.386 │
│ sec/op │
SourceUint64-32 2.370n ± 1%
GlobalInt64-32 3.569n ± 1%
GlobalInt63Parallel-32 0.3221n ± 1%
GlobalUint64-32 8.797n ± 10%
GlobalUint64Parallel-32 0.6351n ± 0%
Int64-32 2.612n ± 2%
Uint64-32 3.350n ± 1%
GlobalIntN1000-32 5.892n ± 1%
IntN1000-32 4.546n ± 1%
Int64N1000-32 14.59n ± 1%
Int64N1e8-32 14.76n ± 2%
Int64N1e9-32 16.57n ± 1%
Int64N2e9-32 14.54n ± 1%
Int64N1e18-32 16.14n ± 1%
Int64N2e18-32 18.10n ± 1%
Int64N4e18-32 18.65n ± 1%
Int32N1000-32 3.560n ± 1%
Int32N1e8-32 3.770n ± 2%
Int32N1e9-32 4.098n ± 0%
Int32N2e9-32 4.179n ± 1%
Float32-32 21.18n ± 4%
Float64-32 20.60n ± 2%
ExpFloat64-32 13.07n ± 0%
NormFloat64-32 7.738n ± 2%
Perm3-32 36.73n ± 1%
Perm30-32 211.9n ± 1%
Perm30ViaShuffle-32 165.2n ± 1%
ShuffleOverhead-32 133.9n ± 1%
Concurrent-32 3.287n ± 2%
For #61716.
Change-Id: I2f0938eae4b7bf736a8cd899a99783e731bf2179
Reviewed-on: https://go-review.googlesource.com/c/go/+/502496
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Rob Pike <r@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
|
||
|
Russ Cox
|
1cc5b34d28 |
math/rand/v2: remove Rand.Seed
Removing Rand.Seed lets us remove lockedSource as well, along with the ambiguity in globalRand about which source to use. For #61716. Change-Id: Ibe150520dd1e7dd87165eacaebe9f0c2daeaedfd Reviewed-on: https://go-review.googlesource.com/c/go/+/502498 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Rob Pike <r@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Russ Cox <rsc@golang.org> |
||
|
Russ Cox
|
48bd1fc93b |
math/rand/v2: clean up regression test
Add more test cases. Replace -printgolden with -update, which rewrites the files for us. For #61716. Change-Id: I7c4c900ee896042429135a21971a56ebe16b6a66 Reviewed-on: https://go-review.googlesource.com/c/go/+/516858 Reviewed-by: Rob Pike <r@golang.org> Reviewed-by: David Chase <drchase@google.com> Auto-Submit: Russ Cox <rsc@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
||
|
Russ Cox
|
d6c1ef52ad |
math/rand/v2: remove Read
In math/rand, Read is deprecated. Remove in v2. People should use crypto/rand if they need long strings. For #61716. Change-Id: Ib254b7e1844616e96db60a3a7abb572b0dcb1583 Reviewed-on: https://go-review.googlesource.com/c/go/+/502497 Reviewed-by: Rob Pike <r@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Auto-Submit: Russ Cox <rsc@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
||
|
Russ Cox
|
d42750b17c |
math/rand/v2: rename various functions
Int31 -> Int32 Int31n -> Int32N Int63 -> Int64 Int63n -> Int64N Intn -> IntN The 31 and 63 are pedantic and confusing: the functions should be named for the type they return, same as all the others. The lower-case n is inconsistent with Go's usual CamelCase and especially problematic because we plan to add 'func N'. Capitalize the n. For #61716. Change-Id: Idb1a005a82f353677450d47fb612ade7a41fde69 Reviewed-on: https://go-review.googlesource.com/c/go/+/516857 Auto-Submit: Russ Cox <rsc@golang.org> Reviewed-by: Robert Griesemer <gri@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
||
|
Russ Cox
|
59f0ab4036 |
math/rand/v2: start of new API
This is the beginning of the math/rand/v2 package from proposal #61716. Start by copying old API. This CL copies math/rand/* to math/rand/v2 and updates references to math/rand to add v2 throughout. Later CLs will make the v2 changes. For #61716. Change-Id: I1624ccffae3dfa442d4ba2461942decbd076e11b Reviewed-on: https://go-review.googlesource.com/c/go/+/502495 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Russ Cox <rsc@golang.org> Reviewed-by: Rob Pike <r@golang.org> |
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Cherry Mui
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8c92897e15 |
cmd/compile: rework TestPGOHash to not rebuild dependencies
TestPGOHash may rebuild dependencies as we pass -trimpath to the go command. This CL makes it pass -trimpath compiler flag to only the current package instead, as we only need the current package to have a stable source file path. Also refactor buildPGOInliningTest to only take compiler flags, not go flags, to avoid accidental rebuild. Should fix #63733. Change-Id: Iec6c4e90cf659790e21083ee2e697f518234c5b9 Reviewed-on: https://go-review.googlesource.com/c/go/+/535915 Reviewed-by: Michael Pratt <mpratt@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Bryan Mills <bcmills@google.com> |
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Cherry Mui
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5613882df7 |
internal/testenv: use cmd.Environ in CleanCmdEnv
In CleanCmdEnv, use cmd.Environ instead of os.Environ, so it sets the PWD environment variable if cmd.Dir is set. This ensures the child process sees a canonical path for its working directory. Change-Id: Ia769552a488dc909eaf6bb7d21937adba06d1072 Reviewed-on: https://go-review.googlesource.com/c/go/+/538215 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Bryan Mills <bcmills@google.com> |
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Jes Cok
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b46aec0765 |
bytes,internal/bytealg: eliminate HashStrBytes,HashStrRevBytes using …
…generics The logic of HashStrBytes, HashStrRevBytes and HashStr, HashStrRev, are exactly the same, except that the types are different. Since the bootstrap toolchain is bumped to 1.20, we can eliminate them by using generics. Change-Id: I4336b1cab494ba963f09646c169b45f6b1ee62e3 GitHub-Last-Rev: b11a2bf9476d54bed4bd18a3f9269b5c95a66d67 GitHub-Pull-Request: golang/go#63766 Reviewed-on: https://go-review.googlesource.com/c/go/+/538175 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Keith Randall <khr@google.com> Auto-Submit: Keith Randall <khr@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
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Cherry Mui
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0262ea1ff9 |
runtime: print a stack trace at "morestack on g0"
Error like "morestack on g0" is one of the errors that is very hard to debug, because often it doesn't print a useful stack trace. The runtime doesn't directly print a stack trace because it is a bad stack state to call print. Sometimes the SIGABRT may trigger a traceback, but sometimes not especially in a cgo binary. Even if it triggers a traceback it often does not include the stack trace of the bad stack. This CL makes it explicitly print a stack trace and throw. The idea is to have some space as an "emergency" crash stack. When the stack is in a really bad state, we switch to the crash stack and do a traceback. Currently only implemented on AMD64 and ARM64. TODO: also handle errors like "morestack on gsignal" and bad systemstack. Also handle other architectures. Change-Id: Ibfc397202f2bb0737c5cbe99f2763de83301c1c1 Reviewed-on: https://go-review.googlesource.com/c/go/+/419435 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com> |
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Alexander Yastrebov
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29b80397a8 |
crypto/subtle: use PCALIGN in xorBytes
goos: linux
goarch: amd64
pkg: crypto/subtle
cpu: Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz
│ master │ HEAD │
│ sec/op │ sec/op vs base │
XORBytes/8Bytes-8 10.90n ± 1% 10.96n ± 5% ~ (p=0.617 n=10)
XORBytes/128Bytes-8 14.85n ± 2% 12.05n ± 2% -18.82% (p=0.000 n=10)
XORBytes/2048Bytes-8 88.30n ± 2% 72.64n ± 1% -17.73% (p=0.000 n=10)
XORBytes/32768Bytes-8 1.489µ ± 2% 1.442µ ± 1% -3.12% (p=0.000 n=10)
geomean 67.91n 60.99n -10.19%
│ master │ HEAD │
│ B/s │ B/s vs base │
XORBytes/8Bytes-8 700.5Mi ± 1% 696.5Mi ± 5% ~ (p=0.631 n=10)
XORBytes/128Bytes-8 8.026Gi ± 2% 9.890Gi ± 2% +23.22% (p=0.000 n=10)
XORBytes/2048Bytes-8 21.60Gi ± 2% 26.26Gi ± 1% +21.55% (p=0.000 n=10)
XORBytes/32768Bytes-8 20.50Gi ± 2% 21.16Gi ± 1% +3.21% (p=0.000 n=10)
geomean 7.022Gi 7.819Gi +11.34%
For #63678
Change-Id: I3996873773748a6f78acc6575e70e09bb6aea979
GitHub-Last-Rev: d9129cb8eae363792b6a6236d597465fcf8d4d6b
GitHub-Pull-Request: golang/go#63754
Reviewed-on: https://go-review.googlesource.com/c/go/+/537856
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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Dmitri Shuralyov
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7546c79e91 |
cmd: update vendored golang.org/x/mod
Pull in CL 500335. It teaches modfile.IsDirectoryPath to recognize all relative paths that begin with a "." or ".." path element as a valid directory path (rather than a module path). This allows removing the path == "." check that CL 389298 added to modload.ToDirectoryPath. go get golang.org/x/mod@6e58e47c # CL 500335 go mod tidy go mod vendor Updates #51448. Fixes #60572. Change-Id: Ide99c728c8dac8fd238e13f6d6a0c3917d7aea2d Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest Reviewed-on: https://go-review.googlesource.com/c/go/+/500355 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com> |
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Mauri de Souza Meneguzzo
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0046c1414c |
net/http: pull http2 underflow fix from x/net/http2
After CL 534295 was merged to fix a CVE it introduced an underflow when we try to decrement sc.curHandlers in handlerDone. Pull in a fix from x/net/http2: http2: fix underflow in http2 server push https://go-review.googlesource.com/c/net/+/535595 Fixes #63511 Change-Id: I5c678ce7dcc53635f3ad5e4999857cb120dfc1ab GitHub-Last-Rev: 587ffa3cafbb9da6bc82ba8a5b83313f81e5c89b GitHub-Pull-Request: golang/go#63561 Reviewed-on: https://go-review.googlesource.com/c/go/+/535575 Run-TryBot: Mauri de Souza Meneguzzo <mauri870@gmail.com> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: David Chase <drchase@google.com> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> |
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Michael Pratt
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1af424c196 |
runtime: clear g0 stack bounds in dropm
After CL 527715, needm uses callbackUpdateSystemStack to set the stack bounds for g0 on an M from the extra M list. Since callbackUpdateSystemStack is also used for recursive cgocallback, it does nothing if the stack is already in bounds. Currently, the stack bounds in an extra M may contain stale bounds from a previous thread that used this M and then returned it to the extra list in dropm. Typically a new thread will not have an overlapping stack with an old thread, but because the old thread has exited there is a small chance that the C memory allocator will allocate the new thread's stack partially or fully overlapping with the old thread's stack. If this occurs, then callbackUpdateSystemStack will not update the stack bounds. If in addition, the overlap is partial such that SP on cgocallback is close to the recorded stack lower bound, then Go may quickly "overflow" the stack and crash with "morestack on g0". Fix this by clearing the stack bounds in dropm, which ensures that callbackUpdateSystemStack will unconditionally update the bounds in needm. For #62440. Change-Id: Ic9e2052c2090dd679ed716d1a23a86d66cbcada7 Reviewed-on: https://go-review.googlesource.com/c/go/+/537695 Reviewed-by: Cherry Mui <cherryyz@google.com> Run-TryBot: Michael Pratt <mpratt@google.com> Auto-Submit: Michael Pratt <mpratt@google.com> TryBot-Bypass: Michael Pratt <mpratt@google.com> |
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Daniel Martí
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5fe2035927 |
internal/profile: actually return errors in postDecode
As spotted by staticcheck, the body did keep track of errors by sharing a single err variable, but its last value was never used as the function simply finished by returning nil. To prevent postDecode from erroring on empty profiles, which breaks TestEmptyProfile, add a check at the top of the function. Update the runtime/pprof test accordingly, since the default units didn't make sense for an empty profile anyway. Change-Id: I188cd8337434adf9169651ab5c914731b8b20f39 Reviewed-on: https://go-review.googlesource.com/c/go/+/483137 Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
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Mauri de Souza Meneguzzo
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555af99bcc |
runtime/internal/atomic: add riscv64 operators for And/Or
These primitives will be used by the new And/Or sync/atomic apis. For #61395 Change-Id: I4062d6317e01afd94d3588f5425237723ab15ade GitHub-Last-Rev: c0a8d8f34dc355997fa697d4d8da7d45a00bb3c7 GitHub-Pull-Request: golang/go#63272 Reviewed-on: https://go-review.googlesource.com/c/go/+/531575 Reviewed-by: Than McIntosh <thanm@google.com> Run-TryBot: Mauri de Souza Meneguzzo <mauri870@gmail.com> Reviewed-by: Mark Ryan <markdryan@rivosinc.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Joel Sing <joel@sing.id.au> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> |