1// Copyright 2018 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package xerrors_test 6 7import ( 8 "bytes" 9 "fmt" 10 "math/big" 11 "testing" 12 13 "golang.org/x/xerrors" 14 "golang.org/x/xerrors/internal" 15) 16 17type myType struct{} 18 19func (myType) Format(s fmt.State, v rune) { 20 s.Write(bytes.Repeat([]byte("Hi! "), 10)) 21} 22 23func BenchmarkErrorf(b *testing.B) { 24 err := xerrors.New("foo") 25 // pi := big.NewFloat(3.14) // Something expensive. 26 num := big.NewInt(5) 27 args := func(a ...interface{}) []interface{} { return a } 28 benchCases := []struct { 29 name string 30 format string 31 args []interface{} 32 }{ 33 {"no_format", "msg: %v", args(err)}, 34 {"with_format", "failed %d times: %v", args(5, err)}, 35 {"method: mytype", "pi: %v", args("myfile.go", myType{}, err)}, 36 {"method: number", "pi: %v", args("myfile.go", num, err)}, 37 } 38 for _, bc := range benchCases { 39 b.Run(bc.name, func(b *testing.B) { 40 b.Run("ExpWithTrace", func(b *testing.B) { 41 for i := 0; i < b.N; i++ { 42 xerrors.Errorf(bc.format, bc.args...) 43 } 44 }) 45 b.Run("ExpNoTrace", func(b *testing.B) { 46 internal.EnableTrace = false 47 defer func() { internal.EnableTrace = true }() 48 49 for i := 0; i < b.N; i++ { 50 xerrors.Errorf(bc.format, bc.args...) 51 } 52 }) 53 b.Run("Core", func(b *testing.B) { 54 for i := 0; i < b.N; i++ { 55 fmt.Errorf(bc.format, bc.args...) 56 } 57 }) 58 }) 59 } 60} 61