package main
import (
"testing"
)
// 第一种
func BenchmarkMake(t *testing.B) {
t.ResetTimer()
origin := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
for i := 0; i < t.N; i++ {
target := make([]int, len(origin))
for _, item := range origin {
if item != 6 {
target = append(target, item)
}
}
}
}
// 第二种
func BenchmarkReuse(t *testing.B) {
t.ResetTimer()
origin := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
for i := 0; i < t.N; i++ {
target := origin[:0]
for _, item := range origin {
if item != 6 {
target = append(target, item)
}
}
}
}
// 第三种
func BenchmarkEditOne(t *testing.B) {
t.ResetTimer()
origin := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
for i := 0; i < t.N; i++ {
for i := 0; i < len(origin); i++ {
if origin[i] == 6 {
origin = append(origin[:i], origin[i+1:]...)
i-- // maintain the correct index
}
}
}
}
// 第四种
func BenchmarkFuck(t *testing.B) {
t.ResetTimer()
origin := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
for i := 0; i < t.N; i++ {
for i := 0; i < len(origin); i++ {
if origin[i] == 6 {
tempV := origin[i]
origin = append(append(origin[:i], origin[i+1:]...), tempV)
//i-- // maintain the correct index
}
}
}
}执行命令：go test main6_test.go -v -bench=.
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输出：
E:\go_work_dir\test\x>go test main6_test.go -v -bench=.
goos: windows
goarch: amd64
BenchmarkMake-8 10000000 146 ns/op
BenchmarkReuse-8 100000000 10.9 ns/op
BenchmarkEditOne-8 200000000 7.69 ns/op
BenchmarkFuck-8 100000000 13.4 ns/op
PASS
ok command-line-arguments 8.592s
命令：go test main6_test.go -v -bench=. -benchtime=3s -benchmem
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原文：
https://www.jianshu.com/p/d276aa7300d1
