pprof发现go程序性能

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修改代码加入pprof

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package main
import (
	_ "net/http/pprof"
)
func main() {
	// we need a webserver to get the pprof webserver
	go func() {
		log.Println(http.ListenAndServe("localhost:6060", nil))
	}()
	// your code
}

生成性能报表

  1. 运行程序

  2. 生成内存性能报表

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    go tool pprof ./apply_idem http://localhost:6060/debug/pprof/heap

  3. 生成CPU性能报表

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    	go tool pprof ./apply_idem http://localhost:6060/debug/pprof/profile
    	Fetching profile over HTTP from http://localhost:6060/debug/pprof/profile
        Saved profile in /Users/loushuai/pprof/pprof.apply_idem.samples.cpu.001.pb.gz
        File: apply_idem
        Type: cpu
        Time: Apr 10, 2018 at 3:33pm (CST)
        Duration: 30.02s, Total samples = 2.55s ( 8.49%)
        Entering interactive mode (type "help" for commands, "o" for options)
    	(pprof) list exec_on_source_for_one_row
    Total: 2.55s
    ROUTINE ======================== main.exec_on_source_for_one_row in /Users/loushuai/dbscale/apply_script_go/apply_idem.go
             0      350ms (flat, cum) 13.73% of Total
             .          .    225:	return time_region_sql_snippet, time_region_sql_snippet_with_t
             .          .    226:}
             .          .    227:
             .          .    228:func exec_on_source_for_one_row(query_sql string, column_count int) []string {
             .          .    229:	row := make([]string, column_count)
             .      320ms    230:	rows := exec_on_source(query_sql)
             .          .    231:	defer rows.Close()
             .          .    232:	rawResult_onerow := make([][]byte, column_count)
             .          .    233:	dest_onerow := make([]interface{}, column_count)
             .          .    234:	for i, _ := range rawResult_onerow {
             .          .    235:		dest_onerow[i] = &rawResult_onerow[i]
             .          .    236:	}
             .          .    237:	for rows.Next() {
             .          .    238:		err := rows.Scan(dest_onerow...)
             .          .    239:		if err != nil {
             .          .    240:			fatal_error(err.Error())
             .          .    241:		}
             .          .    242:		for i, raw := range rawResult_onerow {
             .          .    243:			if raw == nil {
             .          .    244:				row[i] = "\\N"
             .          .    245:			} else {
             .       10ms    246:				row[i] = string(raw)
             .          .    247:			}
             .          .    248:		}
             .          .    249:		break
             .          .    250:	}
             .       20ms    251:	return row
             .          .    252:}
             .          .    253:
             .          .    254:func exec_on_target(query_sql string) {
             .          .    255:	retry_count := 10
             .          .    256:	if Print_msg {

  4. 生成flumegraph

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go-torch  -u http://127.0.0.1:6060/ --seconds 30

参考文章

  1. 使用 pprof 和火焰图调试 golang 应用
  2. net/http/pprof/
  3. runtime/pprof/

本文标题:pprof发现go程序性能

文章作者:Louis

发布时间:2018年04月10日 - 08:04

最后更新:2018年04月10日 - 16:04

原始链接:/2018/04/10/pprof/

许可协议: Louis-非商业性使用-禁止演绎 4.0 国际 转载请保留原文链接及作者。