github.com/chipaca/snappy@v0.0.0-20210104084008-1f06296fe8ad/strutil/matchcounter_benchmark_test.go (about) 1 // -*- Mode: Go; indent-tabs-mode: t -*- 2 3 /* 4 * Copyright (C) 2018 Canonical Ltd 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 3 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 * 18 */ 19 20 package strutil_test 21 22 import ( 23 "regexp" 24 "testing" 25 26 "github.com/snapcore/snapd/strutil" 27 ) 28 29 func benchmarkMatchCounter(b *testing.B, wrx *regexp.Regexp, wn int) { 30 buf := []byte(out) 31 for n := 0; n < b.N; n++ { 32 for step := 1; step < 100; step++ { 33 w := &strutil.MatchCounter{Regexp: wrx, N: wn} 34 var i int 35 for i = 0; i+step < len(buf); i += step { 36 _, err := w.Write(buf[i : i+step]) 37 if err != nil { 38 b.Fatalf("step:%d i:%d: %v", step, i, err) 39 } 40 } 41 _, err := w.Write(buf[i:]) 42 if err != nil { 43 b.Fatalf("step:%d tail: %v", step, err) 44 } 45 } 46 } 47 } 48 49 func BenchmarkNil(b *testing.B) { benchmarkMatchCounter(b, nil, 3) } 50 func BenchmarkNilAll(b *testing.B) { benchmarkMatchCounter(b, nil, -1) } 51 func BenchmarkNilEquiv(b *testing.B) { benchmarkMatchCounter(b, nilRegexpEquiv, 3) } 52 func BenchmarkNilEquivAll(b *testing.B) { benchmarkMatchCounter(b, nilRegexpEquiv, -1) }