golang main 代码
文件路径：/test/fixedbugs/bug369.dir/main.go
/ Copyright 2011 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 main
import (
"flag"
"os"
"runtime"
"testing"
fast "./fast"
slow "./slow"
)
var buf = make([]byte, 1048576)
func BenchmarkFastNonASCII(b *testing.B) {
for i := 0; i < b.N; i++ {
fast.NonASCII(buf, 0)
}
}
func BenchmarkSlowNonASCII(b *testing.B) {
for i := 0; i < b.N; i++ {
slow.NonASCII(buf, 0)
}
}
func main() {
testing.Init()
os.Args = []string{os.Args[0], "-test.benchtime=100ms"}
flag.Parse()
rslow := testing.Benchmark(BenchmarkSlowNonASCII)
rfast := testing.Benchmark(BenchmarkFastNonASCII)
tslow := rslow.NsPerOp()
tfast := rfast.NsPerOp()
/ Optimization should be good for at least 2x, but be forgiving.
/ On the ARM simulator we see closer to 1.5x.
speedup := float64(tslow) / float64(tfast)
want := 1.8
if runtime.GOARCH == "arm" {
want = 1.3
}
if speedup < want {
/ TODO(rsc): doesn't work on linux-amd64 or darwin-amd64 builders, nor on
/ a Lenovo x200 (linux-amd64) laptop.
/ println("fast:", tfast, "slow:", tslow, "speedup:", speedup, "want:", want)
/ println("not fast enough")
/ os.Exit(1)
}
}