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fmt: make benchmarks parallel

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This seems to be the best target to benchmark sync.Pool changes.

This is resend of cl/49910043 which was LGTMed by
TBR=bradfitz

R=golang-codereviews
CC=golang-codereviews
https://golang.org/cl/50140045
This commit is contained in:
Dmitriy Vyukov 2014-01-10 13:51:11 +04:00
parent bb7cd9659b
commit 7f62d08777
1 changed files with 36 additions and 15 deletions
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51
src/pkg/fmt/fmt_test.go
View File

@ -11,6 +11,7 @@ import (
"math"
"runtime"
"strings"
"sync/atomic"
"testing"
"time"
"unicode"
@ -606,46 +607,66 @@ func TestReorder(t *testing.T) {
}
func BenchmarkSprintfEmpty(b *testing.B) {
for i := 0; i < b.N; i++ {
benchmarkSprintf(b, func(buf *bytes.Buffer) {
Sprintf("")
}
})
}
func BenchmarkSprintfString(b *testing.B) {
for i := 0; i < b.N; i++ {
benchmarkSprintf(b, func(buf *bytes.Buffer) {
Sprintf("%s", "hello")
}
})
}
func BenchmarkSprintfInt(b *testing.B) {
for i := 0; i < b.N; i++ {
benchmarkSprintf(b, func(buf *bytes.Buffer) {
Sprintf("%d", 5)
}
})
}
func BenchmarkSprintfIntInt(b *testing.B) {
for i := 0; i < b.N; i++ {
benchmarkSprintf(b, func(buf *bytes.Buffer) {
Sprintf("%d %d", 5, 6)
}
})
}
func BenchmarkSprintfPrefixedInt(b *testing.B) {
for i := 0; i < b.N; i++ {
benchmarkSprintf(b, func(buf *bytes.Buffer) {
Sprintf("This is some meaningless prefix text that needs to be scanned %d", 6)
}
})
}
func BenchmarkSprintfFloat(b *testing.B) {
for i := 0; i < b.N; i++ {
benchmarkSprintf(b, func(buf *bytes.Buffer) {
Sprintf("%g", 5.23184)
}
})
}
func BenchmarkManyArgs(b *testing.B) {
var buf bytes.Buffer
for i := 0; i < b.N; i++ {
benchmarkSprintf(b, func(buf *bytes.Buffer) {
buf.Reset()
Fprintf(&buf, "%2d/%2d/%2d %d:%d:%d %s %s\n", 3, 4, 5, 11, 12, 13, "hello", "world")
Fprintf(buf, "%2d/%2d/%2d %d:%d:%d %s %s\n", 3, 4, 5, 11, 12, 13, "hello", "world")
})
}
func benchmarkSprintf(b *testing.B, f func(buf *bytes.Buffer)) {
const CallsPerSched = 1000
procs := runtime.GOMAXPROCS(-1)
N := int32(b.N / CallsPerSched)
c := make(chan bool, procs)
for p := 0; p < procs; p++ {
go func() {
var buf bytes.Buffer
for atomic.AddInt32(&N, -1) >= 0 {
for g := 0; g < CallsPerSched; g++ {
f(&buf)
}
}
c <- true
}()
}
for p := 0; p < procs; p++ {
<-c
}
}