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https://github.com/golang/go
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60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
// $G -N -o slow.$A $D/bug369.dir/pkg.go &&
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// $G -o fast.$A $D/bug369.dir/pkg.go &&
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// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test that compiling with optimization turned on produces faster code.
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package main
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import (
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"flag"
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"os"
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"runtime"
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"testing"
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fast "./fast"
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slow "./slow"
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)
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var buf = make([]byte, 1048576)
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func BenchmarkFastNonASCII(b *testing.B) {
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for i := 0; i < b.N; i++ {
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fast.NonASCII(buf, 0)
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}
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}
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func BenchmarkSlowNonASCII(b *testing.B) {
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for i := 0; i < b.N; i++ {
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slow.NonASCII(buf, 0)
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}
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}
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func main() {
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os.Args = []string{os.Args[0], "-test.benchtime=0.1"}
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flag.Parse()
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rslow := testing.Benchmark(BenchmarkSlowNonASCII)
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rfast := testing.Benchmark(BenchmarkFastNonASCII)
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tslow := rslow.NsPerOp()
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tfast := rfast.NsPerOp()
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// Optimization should be good for at least 2x, but be forgiving.
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// On the ARM simulator we see closer to 1.5x.
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speedup := float64(tslow)/float64(tfast)
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want := 1.8
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if runtime.GOARCH == "arm" {
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want = 1.3
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}
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if speedup < want {
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// TODO(rsc): doesn't work on linux-amd64 or darwin-amd64 builders, nor on
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// a Lenovo x200 (linux-amd64) laptop.
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//println("fast:", tfast, "slow:", tslow, "speedup:", speedup, "want:", want)
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//println("not fast enough")
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}
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}
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