mirror of
https://github.com/golang/go
synced 2024-10-02 04:28:33 -06:00
46a75870ad
This occurs a fair amount in the runtime for non-power-of-two n. Use an alternative, faster formulation. name old time/op new time/op delta Fastrandn/2-8 4.45ns ± 2% 2.09ns ± 3% -53.12% (p=0.000 n=14+14) Fastrandn/3-8 4.78ns ±11% 2.06ns ± 2% -56.94% (p=0.000 n=15+15) Fastrandn/4-8 4.76ns ± 9% 1.99ns ± 3% -58.28% (p=0.000 n=15+13) Fastrandn/5-8 4.96ns ±13% 2.03ns ± 6% -59.14% (p=0.000 n=15+15) name old time/op new time/op delta SelectUncontended-8 33.7ns ± 2% 33.9ns ± 2% +0.70% (p=0.000 n=49+50) SelectSyncContended-8 1.68µs ± 4% 1.65µs ± 4% -1.54% (p=0.000 n=50+45) SelectAsyncContended-8 282ns ± 1% 277ns ± 1% -1.50% (p=0.000 n=48+43) SelectNonblock-8 5.31ns ± 1% 5.32ns ± 1% ~ (p=0.275 n=45+44) SelectProdCons-8 585ns ± 3% 577ns ± 2% -1.35% (p=0.000 n=50+50) GoroutineSelect-8 1.59ms ± 2% 1.59ms ± 1% ~ (p=0.084 n=49+48) Updates #16213 Change-Id: Ib555a4d7da2042a25c3976f76a436b536487d5b7 Reviewed-on: https://go-review.googlesource.com/36932 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
46 lines
787 B
Go
46 lines
787 B
Go
// Copyright 2017 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package runtime_test
|
|
|
|
import (
|
|
. "runtime"
|
|
"strconv"
|
|
"testing"
|
|
)
|
|
|
|
func BenchmarkFastrand(b *testing.B) {
|
|
b.RunParallel(func(pb *testing.PB) {
|
|
for pb.Next() {
|
|
Fastrand()
|
|
}
|
|
})
|
|
}
|
|
|
|
func BenchmarkFastrandHashiter(b *testing.B) {
|
|
var m = make(map[int]int, 10)
|
|
for i := 0; i < 10; i++ {
|
|
m[i] = i
|
|
}
|
|
b.RunParallel(func(pb *testing.PB) {
|
|
for pb.Next() {
|
|
for _ = range m {
|
|
break
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
var sink32 uint32
|
|
|
|
func BenchmarkFastrandn(b *testing.B) {
|
|
for n := uint32(2); n <= 5; n++ {
|
|
b.Run(strconv.Itoa(int(n)), func(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
sink32 = Fastrandn(n)
|
|
}
|
|
})
|
|
}
|
|
}
|