mirror of
https://github.com/golang/go
synced 2024-11-12 09:50:21 -07:00
63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
// $G -N -o slow.$A $D/bug369.dir/pkg.go &&
|
|
// $G -o fast.$A $D/bug369.dir/pkg.go &&
|
|
// run
|
|
|
|
// NOTE: This test is not run by 'run.go' and so not run by all.bash.
|
|
// To run this test you must use the ./run shell script.
|
|
|
|
// 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.
|
|
|
|
// Test that compiling with optimization turned on produces faster code.
|
|
|
|
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() {
|
|
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")
|
|
}
|
|
}
|