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https://github.com/golang/go
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a66190ecee
Change-Id: Idc67abb95248bc010820a89dd6096a2da334e723
GitHub-Last-Rev: ae9014b011
GitHub-Pull-Request: golang/go#47254
Reviewed-on: https://go-review.googlesource.com/c/go/+/335189
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
// Copyright 2013 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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package go1
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import (
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"math/rand"
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"regexp"
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"testing"
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)
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// benchmark based on regexp/exec_test.go
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var regexpText []byte
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func makeRegexpText(n int) []byte {
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rand.Seed(0) // For reproducibility.
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if len(regexpText) >= n {
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return regexpText[:n]
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}
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regexpText = make([]byte, n)
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for i := range regexpText {
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if rand.Intn(30) == 0 {
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regexpText[i] = '\n'
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} else {
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regexpText[i] = byte(rand.Intn(0x7E+1-0x20) + 0x20)
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}
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}
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return regexpText
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}
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func benchmark(b *testing.B, re string, n int) {
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r := regexp.MustCompile(re)
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t := makeRegexpText(n)
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b.ResetTimer()
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b.SetBytes(int64(n))
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for i := 0; i < b.N; i++ {
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if r.Match(t) {
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b.Fatal("match!")
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}
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}
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}
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const (
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easy0 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
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easy1 = "A[AB]B[BC]C[CD]D[DE]E[EF]F[FG]G[GH]H[HI]I[IJ]J$"
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medium = "[XYZ]ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
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hard = "[ -~]*ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
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)
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func BenchmarkRegexpMatchEasy0_32(b *testing.B) { benchmark(b, easy0, 32<<0) }
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func BenchmarkRegexpMatchEasy0_1K(b *testing.B) { benchmark(b, easy0, 1<<10) }
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func BenchmarkRegexpMatchEasy1_32(b *testing.B) { benchmark(b, easy1, 32<<0) }
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func BenchmarkRegexpMatchEasy1_1K(b *testing.B) { benchmark(b, easy1, 1<<10) }
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func BenchmarkRegexpMatchMedium_32(b *testing.B) { benchmark(b, medium, 32<<0) }
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func BenchmarkRegexpMatchMedium_1K(b *testing.B) { benchmark(b, medium, 1<<10) }
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func BenchmarkRegexpMatchHard_32(b *testing.B) { benchmark(b, hard, 32<<0) }
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func BenchmarkRegexpMatchHard_1K(b *testing.B) { benchmark(b, hard, 1<<10) }
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