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wget https://alibaba.github.io/arthas/arthas-boot.jar
java -jar arthas-boot.jar

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# 基于CPU使用率采样(适用于CPU密集型)
$ profiler start
Started [cpu] profiling

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# 基于样本采样,可估算耗时(适用于IO密集型)
$ profiler start -e wall
Started [wall] profiling

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$ profiler getSamples
23

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$ profiler status
[cpu] profiling is running for 4 seconds

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$ profiler stop
profiler output file: /tmp/demo/arthas-output/20191125-135546.svg
OK

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@RestController
@RequestMapping
public class IndexController {

    @GetMapping("/")
    public String index() throws InterruptedException {
        long start = System.currentTimeMillis();
        cpuHandler();
        long time1 = System.currentTimeMillis();
        timeHandler();
        long time2 = System.currentTimeMillis();
        normalHandler();
        long time3 = System.currentTimeMillis();

        return String.format("%d %d %d", time1 - start, time2 - time1, time3 - time2);
    }

    private int cpuHandler() {
        int value = 0;
        int max = (int)(Math.random() * 100_000_000);
        for (int i = 0; i < max; i++) {
            value += i;
        }
        return value;
    }

    private void timeHandler() throws InterruptedException {
        Thread.sleep(10);
    }

    private void normalHandler() {
        Random random = new Random();
        random.nextInt(100);
    }
}

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curl -so on-cpu.pprof http://127.0.0.1:9090/debug/pprof/profile?seconds=10
go tool pprof -http=0.0.0.0:6061 ./on-cpu.pprof

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curl -so pprof.trace http://127.0.0.1:9090/debug/pprof/trace?seconds=10
go tool trace --pprof=sync pprof.trace > off-cpu.pprof
go tool pprof -http=0.0.0.0:6061 ./off-cpu.pprof

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package main

import (
	"fmt"
	"log"
	"math/rand"
	"net/http"
	_ "net/http/pprof"
	"time"
)

func main() {
	http.HandleFunc("/", handler)
	err := http.ListenAndServe(":9090", nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}

func handler(w http.ResponseWriter, r *http.Request) {
	start := time.Now()
	cpuHandler()
	time1 := time.Now()
	sleepHandler()
	time2 := time.Now()
	normalHandler()
	time3 := time.Now()

	response := fmt.Sprintf("%v, %v, %v", time1.Sub(start), time2.Sub(time1), time3.Sub(time2))
	_, _ = fmt.Fprint(w, response)
}

func cpuHandler() (value int) {
	for i := 0; i < 10_000_000; i++ {
		value += i
	}
	return
}

func sleepHandler() {
	_, _ = http.Get("http://192.168.50.150")
}

func normalHandler() {
	rand.Int31n(100)
}

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[root@localhost ~]# go tool pprof -http=0.0.0.0:6061 ./pprof
Serving web UI on http://0.0.0.0:6061
http://0.0.0.0:6061
Failed to execute dot. Is Graphviz installed?
exec: "dot": executable file not found in $PATH

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Could not execute dot; may need to install graphviz.

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curl -so fgprof.pprof http://127.0.0.1:9090/debug/fgprof?seconds=10
go tool pprof -http=0.0.0.0:6061 ./fgprof.pprof

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package main

import (
	"fmt"
	"github.com/felixge/fgprof"
	"log"
	"math/rand"
	"net/http"
	"time"
)

func main() {
	http.HandleFunc("/", handler)
	http.Handle("/debug/fgprof", fgprof.Handler())
	err := http.ListenAndServe(":9090", nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}

func handler(w http.ResponseWriter, r *http.Request) {
	start := time.Now()
	cpuHandler()
	time1 := time.Now()
	sleepHandler()
	time2 := time.Now()
	normalHandler()
	time3 := time.Now()

	response := fmt.Sprintf("%v, %v, %v", time1.Sub(start), time2.Sub(time1), time3.Sub(time2))
	_, _ = fmt.Fprint(w, response)
}

func cpuHandler() (value int) {
	for i := 0; i < 10_000_000; i++ {
		value += i
	}
	return
}

func sleepHandler() {
	_, _ = http.Get("http://192.168.50.150")
}

func normalHandler() {
	rand.Int31n(100)
}

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// On-CPU采样数据
perf record -g

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// Off-CPU采样数据
perf record -g -e 'sched:sched_switch' -e 'sched:sched_stat_sleep' -e 'sched:sched_process_exit'

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git clone https://github.com/brendangregg/FlameGraph

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perf script | ./FlameGraph/stackcollapse-perf.pl | ./FlameGraph/flamegraph.pl > perf.svg