超好用的自带火焰图的 Java 性能分析工具 Async-profiler 了解一下

git clone https://github.com/jvm-profiling-tools/async-profiler
cd async-profiler
make

➜  develop git clone https://github.com/jvm-profiling-tools/async-profiler
Cloning into 'async-profiler'...
remote: Enumerating objects: 69, done.
remote: Counting objects: 100% (69/69), done.
remote: Compressing objects: 100% (54/54), done.
remote: Total 1805 (delta 34), reused 32 (delta 15), pack-reused 1736
Receiving objects: 100% (1805/1805), 590.78 KiB | 23.00 KiB/s, done.
Resolving deltas: 100% (1288/1288), done.
➜  develop cd async-profiler
➜  async-profiler git:(master) make
mkdir -p build
g++ -O2 -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -DPROFILER_VERSION=\"1.6\" -I/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/include/darwin -fPIC -shared -o build/libasyncProfiler.so src/*.cpp -ldl -lpthread
gcc -O2 -DJATTACH_VERSION=\"1.5\" -o build/jattach src/jattach/jattach.c
mkdir -p build/classes
/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/bin/javac -source 6 -target 6 -d build/classes src/java/one/profiler/AsyncProfiler.java src/java/one/profiler/AsyncProfilerMXBean.java src/java/one/profiler/Counter.java src/java/one/profiler/Events.java
警告: [options] 未与 -source 1.6 一起设置引导类路径
1 个警告
/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/bin/jar cvf build/async-profiler.jar -C build/classes .
已添加清单
正在添加: one/(输入 = 0) (输出 = 0)(存储了 0%)
正在添加: one/profiler/(输入 = 0) (输出 = 0)(存储了 0%)
正在添加: one/profiler/AsyncProfiler.class(输入 = 1885) (输出 = 908)(压缩了 51%)
正在添加: one/profiler/Events.class(输入 = 405) (输出 = 286)(压缩了 29%)
正在添加: one/profiler/Counter.class(输入 = 845) (输出 = 473)(压缩了 44%)
正在添加: one/profiler/AsyncProfilerMXBean.class(输入 = 631) (输出 = 344)(压缩了 45%)
rm -rf build/classes
➜  async-profiler git:(master)

➜  async-profiler git:(master) ./profiler.sh
Usage: ./profiler.sh [action] [options] <pid>
Actions:
  start             start profiling and return immediately
  resume            resume profiling without resetting collected data
  stop              stop profiling
  status            print profiling status
  list              list profiling events supported by the target JVM
  collect           collect profile for the specified period of time
                    and then stop (default action)
Options:
  -e event          profiling event: cpu|alloc|lock|cache-misses etc.
  -d duration       run profiling for <duration> seconds
  -f filename       dump output to <filename>
  -i interval       sampling interval in nanoseconds
  -j jstackdepth    maximum Java stack depth
  -b bufsize        frame buffer size
  -t                profile different threads separately
  -s                simple class names instead of FQN
  -g                print method signatures
  -a                annotate Java method names
  -o fmt            output format: summary|traces|flat|collapsed|svg|tree|jfr
  -v, --version     display version string
  --title string    SVG title
  --width px        SVG width
  --height px       SVG frame height
  --minwidth px     skip frames smaller than px
  --reverse         generate stack-reversed FlameGraph / Call tree
  --all-kernel      only include kernel-mode events
  --all-user        only include user-mode events
  --sync-walk       use synchronous JVMTI stack walker (dangerous!)
<pid> is a numeric process ID of the target JVM
      or 'jps' keyword to find running JVM automatically
Example: ./profiler.sh -d 30 -f profile.svg 3456
         ./profiler.sh start -i 999000 jps
         ./profiler.sh stop -o summary,flat jps

./profiler.sh -d 30 -f profile.svg 3456

-e event     profiling event: cpu|alloc|lock|cache-misses etc.

import java.util.ArrayList;
import java.util.Random;
import java.util.UUID;
/**
 * <p>
 * 模拟热点代码
 *
 * @Author niujinpeng
 */
public class HotCode {
    private static volatile int value;
    private static Object array;
    public static void main(String[] args) {
        while (true) {
            hotmethod1();
            hotmethod2();
            hotmethod3();
            allocate();
        }
    }
    /**
     * 生成 6万长度的数组
     */
    private static void allocate() {
        array = new int[6 * 1000];
        array = new Integer[6 * 1000];
    }
    /**
     * 生成一个UUID
     */
    private static void hotmethod3() {
        ArrayList<String> list = new ArrayList<>();
        UUID uuid = UUID.randomUUID();
        String str = uuid.toString().replace("-", "");
        list.add(str);
    }
    /**
     * 数字累加
     */
    private static void hotmethod2() {
        value++;
    }
    /**
     * 生成一个随机数
     */
    private static void hotmethod1() {
        Random random = new Random();
        int anInt = random.nextInt();
    }
}

➜  develop jps
2800 Jps
2449 HotCode
2450 Launcher
805 RemoteMavenServer36
470 NutstoreGUI
699
➜  develop