098eb01600
Benchmarks:
name old time/op new time/op delta
CopyNSmall-4 5.09µs ± 1% 2.25µs ±86% -55.91% (p=0.000 n=11+14)
CopyNLarge-4 114µs ±73% 121µs ±72% ~ (p=0.701 n=14+14)
name old alloc/op new alloc/op delta
CopyNSmall-4 34.6kB ± 0% 1.9kB ±19% -94.60% (p=0.000 n=12+14)
CopyNLarge-4 129kB ± 8% 127kB ±18% -2.00% (p=0.007 n=14+14)
name old allocs/op new allocs/op delta
CopyNSmall-4 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.000 n=14+14)
CopyNLarge-4 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.000 n=14+14)
Benchmark code:
type Buffer struct {
bytes.Buffer
io.ReaderFrom
}
func BenchmarkCopyNSmall(b *testing.B) {
bs := bytes.Repeat([]byte{0}, 1024)
rd := bytes.NewReader(bs)
buf := new(Buffer)
b.ResetTimer()
for i := 0; i < b.N; i++ {
io.CopyN(buf, rd, 512)
rd.Reset(bs)
}
}
func BenchmarkCopyNLarge(b *testing.B) {
bs := bytes.Repeat([]byte{0}, 64*1024)
rd := bytes.NewReader(bs)
buf := new(Buffer)
b.ResetTimer()
for i := 0; i < b.N; i++ {
io.CopyN(buf, rd, (32*1024)+1)
rd.Reset(bs)
}
}
Change-Id: Id8d29e55758452c870cf372db640f07baec05849
Reviewed-on: https://go-review.googlesource.com/60630
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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