Golang使用pprof监控性能及GC调优

net/http/pprof
runtime/pprof

go tool pprof http://localhost:7777/debug/pprof/heap
go tool pprof http://localhost:7777/debug/pprof/profile

go tool  pprof --text http://localhost:7777/debug/pprof/heap

#xiaorui.cc
package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	_ "net/http/pprof"
	"sync"
	"time"
)

func counter() {
	list := []int{1}
	c := 1
	for i := 0; i < 10000000; i++ {
		httpGet()
		c = i + 1 + 2 + 3 + 4 - 5
		list = append(list, c)
	}
	fmt.Println(c)
	fmt.Println(list[0])
}

func work(wg *sync.WaitGroup) {
	for {
		counter()
		time.Sleep(1 * time.Second)
	}
	wg.Done()
}

func httpGet() int {
	queue := []string{"start..."}
	resp, err := http.Get("http://www.163.com")
	if err != nil {
		// handle error
	}

	//defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		// handle error
	}
	queue = append(queue, string(body))
	return len(queue)
}

func main() {
	flag.Parse()

	//这里实现了远程获取pprof数据的接口
	go func() {
		log.Println(http.ListenAndServe("localhost:7777", nil))
	}()

	var wg sync.WaitGroup
	wg.Add(10)
	for i := 0; i < 100; i++ {
		go work(&wg)
	}

	wg.Wait()
	time.Sleep(3 * time.Second)
}

#xiaorui.cc
$ go tool  pprof --text http://localhost:7777/debug/pprof/heap
Fetching profile from http://localhost:7777/debug/pprof/heap
Saved profile in /Users/ruifengyun/pprof/pprof.localhost:7777.inuse_objects.inuse_space.024.pb.gz
60.81MB of 60.81MB total (  100%)
Dropped 62 nodes (cum <= 0.30MB)
      flat  flat%   sum%        cum   cum%
   56.23MB 92.46% 92.46%    56.23MB 92.46%  bytes.makeSlice
    3.08MB  5.07% 97.53%     3.08MB  5.07%  compress/flate.NewReader
    0.50MB  0.83% 98.36%     0.50MB  0.83%  net/http.(*Transport).dialConn
    0.50MB  0.82% 99.18%     0.50MB  0.82%  net/http.readTransfer
    0.50MB  0.82%   100%     0.50MB  0.82%  net/http.NewRequest
         0     0%   100%    59.31MB 97.53%  bytes.(*Buffer).ReadFrom
         0     0%   100%     3.08MB  5.07%  compress/gzip.(*Reader).readHeader
         0     0%   100%     3.08MB  5.07%  compress/gzip.NewReader
         0     0%   100%    59.31MB 97.53%  io/ioutil.ReadAll
         0     0%   100%    59.31MB 97.53%  io/ioutil.readAll
         0     0%   100%    59.81MB 98.35%  main.counter
         0     0%   100%    59.81MB 98.35%  main.httpGet
         0     0%   100%    59.81MB 98.35%  main.work
         0     0%   100%     0.50MB  0.82%  net/http.(*Client).Get
         0     0%   100%     0.50MB  0.83%  net/http.(*Transport).getConn.func4
         0     0%   100%     3.08MB  5.07%  net/http.(*bodyEOFSignal).Read
         0     0%   100%     3.08MB  5.07%  net/http.(*gzipReader).Read
         0     0%   100%     0.50MB  0.82%  net/http.(*persistConn).readLoop
         0     0%   100%     0.50MB  0.82%  net/http.(*persistConn).readResponse
         0     0%   100%     0.50MB  0.82%  net/http.Get
         0     0%   100%     0.50MB  0.82%  net/http.ReadResponse
         0     0%   100%    60.81MB   100%  runtime.goexit

#xiaorui.cc
$ go tool  pprof  http://localhost:6060/debug/pprof/heap
Fetching profile from http://localhost:6060/debug/pprof/heap
Saved profile in /Users/ruifengyun/pprof/pprof.localhost:6060.inuse_objects.inuse_space.032.pb.gz
Entering interactive mode (type "help" for commands)
(pprof) help

 Commands:
   cmd [n] [--cum] [focus_regex]* [-ignore_regex]*
       Produce a text report with the top n entries.
       Include samples matching focus_regex, and exclude ignore_regex.
       Add --cum to sort using cumulative data.
       Available commands:
         callgrind    Outputs a graph in callgrind format
         disasm       Output annotated assembly for functions matching regexp or address
         dot          Outputs a graph in DOT format
         eog          Visualize graph through eog
         evince       Visualize graph through evince
         gif          Outputs a graph image in GIF format
         gv           Visualize graph through gv
         list         Output annotated source for functions matching regexp
         pdf          Outputs a graph in PDF format
         peek         Output callers/callees of functions matching regexp
         png          Outputs a graph image in PNG format
         proto        Outputs the profile in compressed protobuf format
         ps           Outputs a graph in PS format
         raw          Outputs a text representation of the raw profile
         svg          Outputs a graph in SVG format
         tags         Outputs all tags in the profile
         text         Outputs top entries in text form
         top          Outputs top entries in text form
         tree         Outputs a text rendering of call graph
         web          Visualize graph through web browser
         weblist      Output annotated source in HTML for functions matching regexp or address
   peek func_regex
       Display callers and callees of functions matching func_regex.

   dot [n] [focus_regex]* [-ignore_regex]* [>file]
       Produce an annotated callgraph with the top n entries.
       Include samples matching focus_regex, and exclude ignore_regex.
       For other outputs, replace dot with:
       - Graphic formats: dot, svg, pdf, ps, gif, png (use > to name output file)
       - Graph viewer:    gv, web, evince, eog

   callgrind [n] [focus_regex]* [-ignore_regex]* [>file]
       Produce a file in callgrind-compatible format.
       Include samples matching focus_regex, and exclude ignore_regex.

   weblist func_regex [-ignore_regex]*
       Show annotated source with interspersed assembly in a web browser.

   list func_regex [-ignore_regex]*
       Print source for routines matching func_regex, and exclude ignore_regex.

   disasm func_regex [-ignore_regex]*
       Disassemble routines matching func_regex, and exclude ignore_regex.

   tags tag_regex [-ignore_regex]*
       List tags with key:value matching tag_regex and exclude ignore_regex.

   quit/exit/^D
         Exit pprof.

   option=value
       The following options can be set individually:
           cum/flat:           Sort entries based on cumulative or flat data
           call_tree:          Build context-sensitive call trees
           nodecount:          Max number of entries to display
           nodefraction:       Min frequency ratio of nodes to display
           edgefraction:       Min frequency ratio of edges to display
           focus/ignore:       Regexp to include/exclude samples by name/file
           tagfocus/tagignore: Regexp or value range to filter samples by tag
                               eg "1mb", "1mb:2mb", ":64kb"

           functions:          Level of aggregation for sample data
           files:
           lines:
           addresses:

           unit:               Measurement unit to use on reports

           Sample value selection by index:
            sample_index:      Index of sample value to display
            mean:              Average sample value over first value

           Sample value selection by name:
            alloc_space        for heap profiles
            alloc_objects
            inuse_space
            inuse_objects

            total_delay        for contention profiles
            mean_delay
            contentions

   :   Clear focus/ignore/hide/tagfocus/tagignore
(pprof)