java性能火焰图的生成

朱雀 2022-11-11 05:54 382阅读 0赞

##### 序言 #####

如果你经常遇到 Java 线上性能问题束手无策，看着线上服务 CPU 飙升一筹莫展，发现内存不断泄露满脸茫然。别慌，这里有一款低开销、自带火焰图、让你大呼好用的 Java 性能分析工具 - async-profiler。

##### 1、准备程序 #####

[root@localhost ~]# git clone git://github.com/jvm-profiling-tools/async-profiler
    [root@localhost async-profiler]# yum -y install gcc+ gcc-c++
    [root@localhost async-profiler]# make 
    [root@localhost ~]# more  Test.java  
    public class Test {
    
        public static void main(String[] args) throws Exception {
            Test test = new Test();
            while (true) {
                test.func1();
                test.func2();
                test.func3();
            }
        }
    
        public void func1() throws Exception { //调用第一个方法，需要100ms
            Thread.sleep(100L);
        }
    
        public void func2() throws Exception { //调用第二个方法，需要500ms
            Thread.sleep(500L);
        }
    
        public void func3() throws Exception { //调用第三个方法，需要1500ms
            Thread.sleep(1500L);
        }
    
    }
    [root@localhost ~]# 
    [root@localhost ~]#  javac Test.java 
    [root@localhost ~]# java Test

##### 生成火焰图数据 #####

root      21765   7152  0 18:29 pts/1    00:00:00 java Test
    root      21799  21777  0 18:29 pts/0    00:00:00 grep --color=auto java
    [root@localhost ~]# cd async-profiler/
    [root@localhost async-profiler]# 
    [root@localhost async-profiler]# ./profiler.sh -d 60 -o collapsed -f /tmp/test_01.txt  21765
    Profiling for 60 seconds
    Done
    [root@localhost async-profiler]# cd ..
    [root@localhost ~]# ls
    anaconda-ks.cfg  a.out  async-profiler  FlameGraph  jdk-8u121-linux-x64.tar.gz  perf.data  process.svg  test.c  Test.class  Test.java
    [root@localhost ~]# cd  FlameGraph/
    [root@localhost FlameGraph]# perl flamegraph.pl --colors=java /tmp/test_01.txt > test_01.svg
    [root@localhost FlameGraph]# ls
    aix-perf.pl                example-perf-stacks.txt.gz  README.md                  stackcollapse-instruments.pl      stackcollapse-pmc.pl        test
    demos                      example-perf.svg            record-test.sh             stackcollapse-java-exceptions.pl  stackcollapse-recursive.pl  test_01.svg
    dev                        files.pl                    stackcollapse-aix.pl       stackcollapse-jstack.pl           stackcollapse-sample.awk    test.sh
    difffolded.pl              flamegraph.pl               stackcollapse-bpftrace.pl  stackcollapse-ljp.awk             stackcollapse-stap.pl
    docs                       jmaps                       stackcollapse-elfutils.pl  stackcollapse-perf.pl             stackcollapse-vsprof.pl
    example-dtrace-stacks.txt  pkgsplit-perf.pl            stackcollapse-gdb.pl       stackcollapse-perf-sched.awk      stackcollapse-vtune.pl
    example-dtrace.svg         range-perf.pl               stackcollapse-go.pl        stackcollapse.pl                  stackcollapse-xdebug.php
    [root@localhost FlameGraph]# sz test_01.svg

##### 3、展示 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMxNTU1OTUx_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMxNTU1OTUx_size_16_color_FFFFFF_t_70]: /images/20221022/0eb61dab1216417a91ed04b81387e51f.png