File size: 4,225 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 | // Copyright 2014 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.
package context_test
import (
. "context"
"fmt"
"runtime"
"sync"
"testing"
"time"
)
func BenchmarkCommonParentCancel(b *testing.B) {
root := WithValue(Background(), "key", "value")
shared, sharedcancel := WithCancel(root)
defer sharedcancel()
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
x := 0
for pb.Next() {
ctx, cancel := WithCancel(shared)
if ctx.Value("key").(string) != "value" {
b.Fatal("should not be reached")
}
for i := 0; i < 100; i++ {
x /= x + 1
}
cancel()
for i := 0; i < 100; i++ {
x /= x + 1
}
}
})
}
func BenchmarkWithTimeout(b *testing.B) {
for concurrency := 40; concurrency <= 4e5; concurrency *= 100 {
name := fmt.Sprintf("concurrency=%d", concurrency)
b.Run(name, func(b *testing.B) {
benchmarkWithTimeout(b, concurrency)
})
}
}
func benchmarkWithTimeout(b *testing.B, concurrentContexts int) {
gomaxprocs := runtime.GOMAXPROCS(0)
perPContexts := concurrentContexts / gomaxprocs
root := Background()
// Generate concurrent contexts.
var wg sync.WaitGroup
ccf := make([][]CancelFunc, gomaxprocs)
for i := range ccf {
wg.Add(1)
go func(i int) {
defer wg.Done()
cf := make([]CancelFunc, perPContexts)
for j := range cf {
_, cf[j] = WithTimeout(root, time.Hour)
}
ccf[i] = cf
}(i)
}
wg.Wait()
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
wcf := make([]CancelFunc, 10)
for pb.Next() {
for i := range wcf {
_, wcf[i] = WithTimeout(root, time.Hour)
}
for _, f := range wcf {
f()
}
}
})
b.StopTimer()
for _, cf := range ccf {
for _, f := range cf {
f()
}
}
}
func BenchmarkCancelTree(b *testing.B) {
depths := []int{1, 10, 100, 1000}
for _, d := range depths {
b.Run(fmt.Sprintf("depth=%d", d), func(b *testing.B) {
b.Run("Root=Background", func(b *testing.B) {
for i := 0; i < b.N; i++ {
buildContextTree(Background(), d)
}
})
b.Run("Root=OpenCanceler", func(b *testing.B) {
for i := 0; i < b.N; i++ {
ctx, cancel := WithCancel(Background())
buildContextTree(ctx, d)
cancel()
}
})
b.Run("Root=ClosedCanceler", func(b *testing.B) {
for i := 0; i < b.N; i++ {
ctx, cancel := WithCancel(Background())
cancel()
buildContextTree(ctx, d)
}
})
})
}
}
func buildContextTree(root Context, depth int) {
for d := 0; d < depth; d++ {
root, _ = WithCancel(root)
}
}
func BenchmarkCheckCanceled(b *testing.B) {
ctx, cancel := WithCancel(Background())
cancel()
b.Run("Err", func(b *testing.B) {
for i := 0; i < b.N; i++ {
ctx.Err()
}
})
b.Run("Done", func(b *testing.B) {
for i := 0; i < b.N; i++ {
select {
case <-ctx.Done():
default:
}
}
})
}
func BenchmarkContextCancelDone(b *testing.B) {
ctx, cancel := WithCancel(Background())
defer cancel()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
select {
case <-ctx.Done():
default:
}
}
})
}
func BenchmarkDeepValueNewGoRoutine(b *testing.B) {
for _, depth := range []int{10, 20, 30, 50, 100} {
ctx := Background()
for i := 0; i < depth; i++ {
ctx = WithValue(ctx, i, i)
}
b.Run(fmt.Sprintf("depth=%d", depth), func(b *testing.B) {
for i := 0; i < b.N; i++ {
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
ctx.Value(-1)
}()
wg.Wait()
}
})
}
}
func BenchmarkDeepValueSameGoRoutine(b *testing.B) {
for _, depth := range []int{10, 20, 30, 50, 100} {
ctx := Background()
for i := 0; i < depth; i++ {
ctx = WithValue(ctx, i, i)
}
b.Run(fmt.Sprintf("depth=%d", depth), func(b *testing.B) {
for i := 0; i < b.N; i++ {
ctx.Value(-1)
}
})
}
}
func BenchmarkErrOK(b *testing.B) {
ctx, cancel := WithCancel(Background())
defer cancel()
for b.Loop() {
if err := ctx.Err(); err != nil {
b.Fatalf("ctx.Err() = %v", err)
}
}
}
func BenchmarkErrCanceled(b *testing.B) {
ctx, cancel := WithCancel(Background())
cancel()
for b.Loop() {
if err := ctx.Err(); err == nil {
b.Fatalf("ctx.Err() = %v", err)
}
}
}
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