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1fa7029425
Combine NoScan allocations < 16 bytes into a single memory block. Reduces number of allocations on json/garbage benchmarks by 10+%. json-1 allocated 8039872 7949194 -1.13% allocs 105774 93776 -11.34% cputime 156200000 100700000 -35.53% gc-pause-one 4908873 3814853 -22.29% gc-pause-total 2748969 2899288 +5.47% rss 52674560 43560960 -17.30% sys-gc 3796976 3256304 -14.24% sys-heap 43843584 35192832 -19.73% sys-other 5589312 5310784 -4.98% sys-stack 393216 393216 +0.00% sys-total 53623088 44153136 -17.66% time 156193436 100886714 -35.41% virtual-mem 256548864 256540672 -0.00% garbage-1 allocated 2996885 2932982 -2.13% allocs 62904 55200 -12.25% cputime 17470000 17400000 -0.40% gc-pause-one 932757485 925806143 -0.75% gc-pause-total 4663787 4629030 -0.75% rss 1151074304 1133670400 -1.51% sys-gc 66068352 65085312 -1.49% sys-heap 1039728640 1024065536 -1.51% sys-other 38038208 37485248 -1.45% sys-stack 8650752 8781824 +1.52% sys-total 1152485952 1135417920 -1.48% time 17478088 17418005 -0.34% virtual-mem 1343709184 1324204032 -1.45% LGTM=iant, bradfitz R=golang-codereviews, dave, iant, rsc, bradfitz CC=golang-codereviews, khr https://golang.org/cl/38750047
64 lines
1.1 KiB
Go
64 lines
1.1 KiB
Go
// run
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test that defers do not prevent garbage collection.
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package main
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import (
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"runtime"
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"sync"
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"sync/atomic"
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"time"
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)
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var sink func()
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func main() {
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// Does not work on 32-bits due to partially conservative GC.
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// Try to enable when we have fully precise GC.
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if runtime.GOARCH != "amd64" {
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return
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}
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// Likewise for gccgo.
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if runtime.Compiler == "gccgo" {
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return
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}
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N := 10
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count := int32(N)
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var wg sync.WaitGroup
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wg.Add(N)
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for i := 0; i < N; i++ {
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go func() {
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defer wg.Done()
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v := new(string)
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f := func() {
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if *v != "" {
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panic("oops")
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}
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}
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if *v != "" {
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// let the compiler think f escapes
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sink = f
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}
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runtime.SetFinalizer(v, func(p *string) {
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atomic.AddInt32(&count, -1)
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})
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defer f()
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}()
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}
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wg.Wait()
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for i := 0; i < 3; i++ {
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time.Sleep(10 * time.Millisecond)
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runtime.GC()
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}
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if count != 0 {
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println(count, "out of", N, "finalizer are not called")
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panic("not all finalizers are called")
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}
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}
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