golang 使用pprof进行性能调优

概述  package mainimport "fmt"func lengthOfNonRepeatingSubStr(s string) int { lastOccurred := make(map[rune]int) start := 0 maxLength := 0 for i, ch := range []rune(s) { if lastI, ok :=

 

package mainimport "fmt"func lengthOfNonRepeatingSubStr(s string) int {	lastOccurred := make(map[rune]int)	start := 0	maxLength := 0	for i,ch := range []rune(s) {		if lastI,ok := lastOccurred[ch]; ok && lastI >= start {			start = lastI + 1		}		if i-start+1 > maxLength {			maxLength = i - start + 1		}		lastOccurred[ch] = i	}	return maxLength}func main() {	fmt.Println(lengthOfNonRepeatingSubStr("123123"))}

　　随便写一个名字叫nonrepeat.go的文件,然后再写了一个nonrepeat_test.go

package mainimport "testing"func BenchmarkLengthOfNonRepeatingSubStr(b *testing.B) {	for i := 0; i < b.N; i++ {		if lengthOfNonRepeatingSubStr("123123") != 3 {			b.Errorf("正确的值是:%d",3)		}	}}

　　然后执行:

go test -bench .  -cpuprofile cpu.outgoos: darwingoarch: amd64pkg: gopcp.v2/chapter7/nonrepeatBenchmarkLengthOfNonRepeatingSubStr-4           10000000               225 ns/opPASSok      gopcp.v2/chapter7/nonrepeat     2.646s

　　

 nonrepeat go tool pprof cpu.out Type: cpuTime: Apr 16,2019 at 6:53pm (CST)Duration: 2.64s,Total samples = 2.28s (86.48%)Entering interactive mode (type "help" for commands,"o" for options)(pprof) 

　　mac 上面还需要安装图形化的界面工具 https://www.macports.org/install.php ,实在不行参考 https://blog.csdn.net/qq_36847641/article/details/78224910 这个安装盒子

　　

(pprof) webFailed to execute dot. Is Graphviz installed? Error: exec: "dot": executable file not found in $PATH(pprof) 

　　

上面分析得出map 访问占用的性能比较高,可以换个用 slice 处理

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