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## 下载启动测试程序
curl -O https://arthas.aliyun.com/math-game.jar
java -jar math-game.jar

# 下载启动 arthas
curl -O https://arthas.aliyun.com/arthas-boot.jar
java -jar arthas-boot.jar

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public class Advice {

    private final ClassLoader loader;
    private final Class<?> clazz;
    private final ArthasMethod method;
    private final Object target;
    private final Object[] params;
    private final Object returnObj;
    private final Throwable throwExp;
    private final boolean isBefore;
    private final boolean isThrow;
    private final boolean isReturn;

    // getter/setter
}

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$ help
 NAME         DESCRIPTION
 help         Display Arthas Help
 auth         Authenticates the current session
 keymap       Display all the available keymap for the specified connection.
 sc           Search all the classes loaded by JVM
 sm           Search the method of classes loaded by JVM
 classloader  Show classloader info
 jad          Decompile class
 getstatic    Show the static field of a class
 monitor      Monitor method execution statistics, e.g. total/success/failure count, average rt, fail rate, etc.
 stack        Display the stack trace for the specified class and method
 thread       Display thread info, thread stack
 trace        Trace the execution time of specified method invocation.
 watch        Display the input/output parameter, return object, and thrown exception of specified method invocation
 tt           Time Tunnel
 jvm          Display the target JVM information
 memory       Display jvm memory info.
 perfcounter  Display the perf counter information.
 ognl         Execute ognl expression.
 mc           Memory compiler, compiles java files into bytecode and class files in memory.
 redefine     Redefine classes. @see Instrumentation#redefineClasses(ClassDefinition...)
 retransform  Retransform classes. @see Instrumentation#retransformClasses(Class...)
 dashboard    Overview of target jvm's thread, memory, gc, vm, tomcat info.
 dump         Dump class byte array from JVM
 heapdump     Heap dump
 options      View and change various Arthas options
 cls          Clear the screen
 reset        Reset all the enhanced classes
 version      Display Arthas version
 session      Display current session information
 sysprop      Display and change the system properties.
 sysenv       Display the system env.
 vmoption     Display, and update the vm diagnostic options.
 logger       Print logger info, and update the logger level
 history      Display command history
 cat          Concatenate and print files
 base64       Encode and decode using Base64 representation
 echo         write arguments to the standard output
 pwd          Return working directory name
 mbean        Display the mbean information
 grep         grep command for pipes.
 tee          tee command for pipes.
 profiler     Async Profiler. https://github.com/jvm-profiling-tools/async-profiler
 vmtool       jvm tool
 stop         Stop/Shutdown Arthas server and exit the console.
 jfr          Java Flight Recorder Command

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$ help dashboard
 USAGE:
   dashboard [-h] [-i <value>] [-n <value>]

 SUMMARY:
   Overview of target jvm's thread, memory, gc, vm, tomcat info.

 EXAMPLES:
   dashboard
   dashboard -n 10
   dashboard -i 2000

 WIKI:
   https://arthas.aliyun.com/doc/dashboard

 OPTIONS:
 -h, --help                              this help
 -i, --interval <value>                  The interval (in ms) between two executions, default is 5000 ms.
 -n, --number-of-execution <value>       The number of times this command will be executed.

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$ session
 Name        Value
--------------------------------------------------
 JAVA_PID    96956
 SESSION_ID  14219aff-0255-4e7d-aaa8-244061bd8277

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# 还原指定类
reset Test
# 还原所有类
reset

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$ version
3.7.2

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# 查看所有的 options
options
# 获取 option 的值
options json-format
# 设置指定的 option
options save-result true

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options unsafe true

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$ watch demo.MathGame primeFactors 'target' 'target.illegalArgumentCount=1'
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 20 ms, listenerId: 6
watch failed, condition is: target.illegalArgumentCount=1, express is: target, By default, strict mode is true, not allowed to set object properties. Want to set object properties, execute `options strict false`, visit /Users/lucaschen/logs/arthas/arthas.log for more details.

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# 一键展示当前最忙的前 N 个线程并打印堆栈
thread -n 3

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# 当没有参数时，显示第一页线程的信息
# 默认按照 CPU 增量时间降序排列，只显示第一页数据。
thread

# 显示所有匹配线程信息，有时需要获取全部 JVM 的线程数据进行分析。
thread --all

# thread id, 显示指定线程的运行堆栈
thread 1

# thread -b, 找出当前阻塞其他线程的线程
# 有时候我们发现应用卡住了， 通常是由于某个线程拿住了某个锁， 并且其他线程都在等待这把锁造成的。 为了排查这类问题， arthas 提供了 thread -b， 一键找出那个罪魁祸首
# **注意**
# 注意， 目前只支持找出 synchronized 关键字阻塞住的线程， 如果是java.util.concurrent.Lock， 目前还不支持
thread -b

# thread -i, 指定采样时间间隔
# 统计最近 1000ms 内的线程 CPU 时间
thread -i 1000
# 列出 1000ms 内最忙的 3 个线程栈
thread -n 3 -i 1000

# thread --state ，查看指定状态的线程
# NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, TERMINATED
thread --state WAITING

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# 查看所有属性
sysprop

# 查看单个属性, 支持通过TAB键自动补全
sysprop java.version

# 修改单个属性
sysprop user.country CN

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# 查看所有环境变量
sysenv

# 查看单个环境变量, 支持通过TAB键自动补全
sysenv java.version

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# 查看所有的 option
vmoption

# 查看指定的 option
vmoption PrintGC

# 更新指定的 option
vmoption PrintGCDetails true

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# 获取对象
# 通过 --limit参数，可以限制返回值数量，避免获取超大数据时对 JVM 造成压力。默认值是 10。
vmtool --action getInstances --className java.lang.String --limit 10

# 指定 classloader name
vmtool --action getInstances --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --className org.springframework.context.ApplicationContext

# 指定 classloader hash
#可以通过sc命令查找到加载 class 的 classloader。
sc -d org.springframework.context.ApplicationContext
 class-info        org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
 code-source       file:/private/tmp/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/
 name              org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
...
 class-loader      +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2
                     +-sun.misc.Launcher$AppClassLoader@75b84c92
                       +-sun.misc.Launcher$ExtClassLoader@4f023edb
 classLoaderHash   19469ea2
# 然后用-c/--classloader 参数指定：
vmtool --action getInstances -c 19469ea2 --className org.springframework.context.ApplicationContext

# 指定返回结果展开层数
# getInstances action 返回结果绑定到instances变量上，它是数组。
# 通过 -x/--expand 参数可以指定结果的展开层次，默认值是 1。
vmtool --action getInstances -c 19469ea2 --className org.springframework.context.ApplicationContext -x 2

# 执行表达式
# getInstances action 返回结果绑定到instances变量上，它是数组。可以通过--express参数执行指定的表达式。
vmtool --action getInstances --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --className org.springframework.context.ApplicationContext --express 'instances[0].getBeanDefinitionNames()'

# 强制 GC
# 可以结合 vmoption 命令动态打开PrintGC开关
vmtool --action forceGc

# interrupt 指定线程
# thread id 通过-t参数指定，可以使用 thread 命令获取。
vmtool --action interruptThread -t 1

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perfcounter
# 可以用-d参数打印更多信息：
perfcounter -d

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--add-opens java.base/jdk.internal.perf=ALL-UNNAMED --add-exports java.base/jdk.internal.perf=ALL-UNNAMED --add-opens java.management/sun.management.counter.perf=ALL-UNNAMED --add-opens java.management/sun.management.counter=ALL-UNNAMED

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# 更新 logger level
logger --name ROOT --level debug

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# 通过 getstatic 命令可以方便的查看类的静态属性。使用方法为 `getstatic class_name field_name`
getstatic demo.MathGame random

# 注意 hashcode 是变化的，需要先查看当前的 ClassLoader 信息，使用sc -d <ClassName>提取对应 ClassLoader 的 hashcode。
# 如果你使用-c，你需要手动输入 hashcode：-c <hashcode>
getstatic -c 3d4eac69 demo.MathGame random
# 对于只有唯一实例的 ClassLoader 可以通过--classLoaderClass指定 class name，使用起来更加方便：
getstatic --classLoaderClass sun.misc.Launcher$AppClassLoader demo.MathGame random

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# 调用静态函数：
ognl '@[email protected]("hello")'
# 获取静态类的静态字段：
ognl '@demo.MathGame@random'
# 执行多行表达式，赋值给临时变量，返回一个 List：
$ ognl '#value1=@System@getProperty("java.home"), #value2=@System@getProperty("java.runtime.name"), {#value1, #value2}'

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# 查看第一个参数：
watch com.taobao.container.Test test "params[0]"

# 查看第一个参数的 size：
watch com.taobao.container.Test test "params[0].size()"

# 将结果按 name 属性投影：
watch com.taobao.container.Test test "params[0].{ #this.name }"

# 按条件过滤：
watch com.taobao.container.Test test "params[0].{? #this.name == null }.size() > 0" -x 2

# 过滤后统计：
watch com.taobao.container.Test test "params[0].{? #this.age > 10 }.size()" -x 2

# 判断字符串相等
watch com.demo.Test test 'params[0]=="xyz"'

# 判断 long 型
watch com.demo.Test test 'params[0]==123456789L'

# 子表达式求值：
watch com.taobao.container.Test test "params[0].{? #this.age > 10 }.size().(#this > 20 ? #this - 10 : #this + 10)" -x 2

# 选择第一个满足条件：
watch com.taobao.container.Test test "params[0].{^ #this.name != null}" -x 2

# 选择最后一个满足条件：
watch com.taobao.container.Test test "params[0].{$ #this.name != null}" -x 2


# 匹配线程 & 正则多个类多个方法
trace -E 'io\.netty\.channel\.nio\.NioEventLoop|io\.netty\.util\.concurrent\.SingleThreadEventExecutor'  'select|processSelectedKeys|runAllTasks' '@Thread@currentThread().getName().contains("IO-HTTP-WORKER-IOPool")&&#cost>500'

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# 列出所有 Mbean 的名称：
mbean

# 查看 Mbean 的元信息：
mbean -m java.lang:type=Threading

# 查看 mbean 属性信息：
mbean java.lang:type=Threading

# mbean 的 name 支持通配符匹配：
# 注意：ObjectName 的匹配规则与正常的通配符存在差异，详细参见：[javax.management.ObjectName](https://docs.oracle.com/javase/8/docs/api/javax/management/ObjectName.html?is-external=true)
mbean java.lang:type=Th*

# 通配符匹配特定的属性字段：
mbean java.lang:type=Threading *Count

# 使用 -E 命令切换为正则匹配：
mbean -E java.lang:type=Threading PeakThreadCount|ThreadCount|DaemonThreadCount

# 使用 -i 命令实时监控：
mbean -i 1000 java.lang:type=Threading *Count

# 实时监控使用 -i，使用 -n 命令执行命令的次数（默认为 100 次）：
mbean -i 1000 -n 50 java.lang:type=Threading *Count

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# dump 到指定文件
# 生成文件在arthas-output目录，可以通过浏览器下载： http://localhost:8563/arthas-output/
heapdump arthas-output/dump.hprof

# 只 dump live 对象
heapdump --live /tmp/dump.hprof

# dump 到临时文件
heapdump

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# 模糊搜索
sc demo.*

# 打印类的详细信息
sc -d demo.MathGame

# 打印出类的 Field 信息
sc -d -f demo.MathGame

# 通过 ClassLoader#toString 查找类（前提：有一个 toString()返回值是apo的类加载器，加载的类中包含 `demo.MathGame`, `demo.MyBar`, `demo.MyFoo3` 个类）
sc -cs apo *demo*

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sm java.lang.String
sm -d java.lang.String toString

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# 反编译java.lang.String
jad java.lang.String

# 反编译时只显示源代码
# 默认情况下，反编译结果里会带有 ClassLoader 信息，通过 --source-only 选项，可以只打印源代码。方便和 mc/retransform 命令结合使用
jad --source-only demo.MathGame

# 反编译指定的函数
jad demo.MathGame main

# 反编译时不显示行号
# --lineNumber 参数默认值为 true，显示指定为 false 则不打印行号。
jad demo.MathGame main --lineNumber false

# 反编译时指定 ClassLoader
# 当有多个 ClassLoader 都加载了这个类时，jad 命令会输出对应 ClassLoader 实例的 hashcode，然后你只需要重新执行 jad 命令，并使用参数 -c <hashcode> 就可以反编译指定 ClassLoader 加载的那个类了；
jad org.apache.log4j.Logger
# 对于只有唯一实例的 ClassLoader 还可以通过--classLoaderClass指定 class name，使用起来更加方便：
# --classLoaderClass 的值是 ClassLoader 的类名，只有匹配到唯一的 ClassLoader 实例时才能工作，目的是方便输入通用命令，而-c <hashcode>是动态变化的。

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> **提示**
>
> 加载外部的.class文件，retransform jvm 已加载的类。

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# retransform 指定的 .class 文件
# 加载指定的 .class 文件，然后解析出 class name，再 retransform jvm 中已加载的对应的类。每加载一个 .class 文件，则会记录一个 retransform entry.
# 如果多次执行 retransform 加载同一个 class 文件，则会有多条 retransform entry.
retransform /tmp/Test.class

# 查看 retransform entry
# TransformCount 统计在 ClassFileTransformer#transform 函数里尝试返回 entry 对应的 .class 文件的次数，但并不表明 transform 一定成功。
retransform -l

# 删除指定 retransform entry
# 需要指定 id：
retransform -d 1                    # delete retransform entry

# 删除所有 retransform entry
retransform --deleteAll             # delete all retransform entries

# 显式触发 retransform
# 注意：对于同一个类，当存在多个 retransform entry 时，如果显式触发 retransform ，则最后添加的 entry 生效(id 最大的)。
retransform --classPattern demo.*   # triger retransform classes


retransform -c 327a647b /tmp/Test.class /tmp/Test\$Inner.class
retransform --classLoaderClass 'sun.misc.Launcher$AppClassLoader' /tmp/Test.class

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jad --source-only com.example.demo.arthas.user.UserController > /tmp/UserController.java

mc /tmp/UserController.java -d /tmp

retransform /tmp/com/example/demo/arthas/user/UserController.class

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base64 < Test.class > result.txt

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base64 -d < result.txt > Test.class

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public class MathGame {
    public static void main(String[] args) throws InterruptedException {
        MathGame game = new MathGame();
        while (true) {
            game.run();
            TimeUnit.SECONDS.sleep(1);
            // 这个不生效，因为代码一直跑在 while里
            System.out.println("in loop");
        }
    }

    public void run() throws InterruptedException {
        // 这个生效，因为run()函数每次都可以完整结束
        System.out.println("call run()");
        try {
            int number = random.nextInt();
            List<Integer> primeFactors = primeFactors(number);
            print(number, primeFactors);

        } catch (Exception e) {
            System.out.println(String.format("illegalArgumentCount:%3d, ", illegalArgumentCount) + e.getMessage());
        }
    }
}

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dump java.lang.String

dump demo.*

dump -d /tmp/output java.lang.String

# 指定 classLoader
# 如果你使用 -c，你需要手动输入 hashcode：-c <hashcode>
dump -c 3d4eac69 demo.*
# 对于只有唯一实例的 ClassLoader 可以通过--classLoaderClass指定 class name，使用起来更加方便：
dump --classLoaderClass sun.misc.Launcher$AppClassLoader demo.*

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# 按类加载类型查看统计信息
classloader
# 按类加载实例查看统计信息
classloader -l
# 查看 ClassLoader 的继承树
classloader -t

# 查看 URLClassLoader 实际的 urls
classloader -c 3d4eac69
# 注意 hashcode 是变化的，需要先查看当前的 ClassLoader 信息，提取对应 ClassLoader 的 hashcode。
# 对于只有唯一实例的 ClassLoader 可以通过 class name 指定，使用起来更加方便：
classloader --classLoaderClass sun.misc.Launcher$AppClassLoader

# 使用 ClassLoader 去查找 resource
classloader -c 3d4eac69  -r META-INF/MANIFEST.MF
# 也可以尝试查找类的 class 文件：
classloader -c 1b6d3586 -r java/lang/String.class

# 使用 ClassLoader 去加载类
classloader -c 3d4eac69 --load demo.MathGame

# 统计 ClassLoader 实际使用 URL 和未使用的 URL
classloader --url-stat
# 注意，基于 JVM 目前已加载的所有类统计，不代表 Unused URLs 可以从应用中删掉。因为可能将来需要从 Unused URLs 里加载类，或者需要加载 resources。

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$ monitor -c 5 demo.MathGame primeFactors
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 94 ms.
 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2018-12-03 19:06:38  demo.MathGame  primeFactors  5      1        4     1.15        80.00%

 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2018-12-03 19:06:43  demo.MathGame  primeFactors  5      3        2     42.29       40.00%

 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2018-12-03 19:06:48  demo.MathGame  primeFactors  5      3        2     67.92       40.00%

 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2018-12-03 19:06:53  demo.MathGame  primeFactors  5      2        3     0.25        60.00%

 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2018-12-03 19:06:58  demo.MathGame  primeFactors  1      1        0     0.45        0.00%

 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2018-12-03 19:07:03  demo.MathGame  primeFactors  2      2        0     3182.72     0.00%

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$ monitor -c 1 -m 1 demo.MathGame primeFactors
Press Q or Ctrl+C to abort.
Affect(class count:1 , method count:1) cost in 384 ms, listenerId: 6.
 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2022-12-25 21:12:58  demo.MathGame  primeFactors  1      1        0     0.18        0.00%

 timestamp            class          method        total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2022-12-25 21:12:59  demo.MathGame  primeFactors  0      0        0     0.00       0.00%

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monitor -c 5 demo.MathGame primeFactors "params[0] <= 2"
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 19 ms, listenerId: 5
 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
-----------------------------------------------------------------------------------------------
 2020-09-02 09:42:36  demo.MathGame  primeFactors    5       3       2      0.09       40.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:41  demo.MathGame  primeFactors    5       2       3      0.11       60.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:46  demo.MathGame  primeFactors    5       1       4      0.06       80.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:51  demo.MathGame  primeFactors    5       1       4      0.12       80.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:56  demo.MathGame  primeFactors    5       3       2      0.15       40.00%

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monitor -b -c 5 com.test.testes.MathGame primeFactors "params[0] <= 2"
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 21 ms, listenerId: 4
 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:41:57  demo.MathGame  primeFactors    1       0        1      0.10      100.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:02  demo.MathGame  primeFactors    3       0        3      0.06      100.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:07  demo.MathGame  primeFactors    2       0        2      0.06      100.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:12  demo.MathGame  primeFactors    1       0        1      0.05      100.00%

 timestamp            class          method         total  success  fail  avg-rt(ms)  fail-rate
----------------------------------------------------------------------------------------------
 2020-09-02 09:42:17  demo.MathGame  primeFactors    2       0        2      0.10      100.00%

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# 观察表达式，默认值是{params, target, returnObj}
$ watch demo.MathGame primeFactors -x 2
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 32 ms, listenerId: 5
method=demo.MathGame.primeFactors location=AtExceptionExit
ts=2021-08-31 15:22:57; [cost=0.220625ms] result=@ArrayList[
    @Object[][
        @Integer[-179173],
    ],
    @MathGame[
        random=@Random[java.util.Random@31cefde0],
        illegalArgumentCount=@Integer[44],
    ],
    null,
]
method=demo.MathGame.primeFactors location=AtExit
ts=2021-08-31 15:22:58; [cost=1.020982ms] result=@ArrayList[
    @Object[][
        @Integer[1],
    ],
    @MathGame[
        random=@Random[java.util.Random@31cefde0],
        illegalArgumentCount=@Integer[44],
    ],
    @ArrayList[
        @Integer[2],
        @Integer[2],
        @Integer[26947],
    ],
]

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$ watch demo.MathGame primeFactors -m 1
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 302 ms, listenerId: 3
method=demo.MathGame.primeFactors location=AtExceptionExit
ts=2022-12-25 19:58:41; [cost=0.222419ms] result=@ArrayList[
    @Object[][isEmpty=false;size=1],
    @MathGame[demo.MathGame@3bf400],
    null,
]
method=demo.MathGame.primeFactors location=AtExceptionExit
ts=2022-12-25 19:58:51; [cost=0.046928ms] result=@ArrayList[
    @Object[][isEmpty=false;size=1],
    @MathGame[demo.MathGame@3bf400],
    null,
]

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$ watch demo.MathGame primeFactors "{params,returnObj}" -x 2 -b
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 50 ms.
ts=2018-12-03 19:23:23; [cost=0.0353ms] result=@ArrayList[
    @Object[][
        @Integer[-1077465243],
    ],
    null,
]
# 对比前一个例子，返回值为空（事件点为函数执行前，因此获取不到返回值）

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$ watch demo.MathGame primeFactors "{params,target,returnObj}" -x 2 -b -s -n 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 46 ms.
ts=2018-12-03 19:29:54; [cost=0.01696ms] result=@ArrayList[
    @Object[][
        @Integer[1],
    ],
    @MathGame[
        random=@Random[java.util.Random@522b408a],
        illegalArgumentCount=@Integer[13038],
    ],
    null,
]
ts=2018-12-03 19:29:54; [cost=4.277392ms] result=@ArrayList[
    @Object[][
        @Integer[1],
    ],
    @MathGame[
        random=@Random[java.util.Random@522b408a],
        illegalArgumentCount=@Integer[13038],
    ],
    @ArrayList[
        @Integer[2],
        @Integer[2],
        @Integer[2],
        @Integer[5],
        @Integer[5],
        @Integer[73],
        @Integer[241],
        @Integer[439],
    ],
]

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$ watch demo.MathGame primeFactors "{params,target}" -x 3
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 58 ms.
ts=2018-12-03 19:34:19; [cost=0.587833ms] result=@ArrayList[
    @Object[][
        @Integer[1],
    ],
    @MathGame[
        random=@Random[
            serialVersionUID=@Long[3905348978240129619],
            seed=@AtomicLong[3133719055989],
            multiplier=@Long[25214903917],
            addend=@Long[11],
            mask=@Long[281474976710655],
            DOUBLE_UNIT=@Double[1.1102230246251565E-16],
            BadBound=@String[bound must be positive],
            BadRange=@String[bound must be greater than origin],
            BadSize=@String[size must be non-negative],
            seedUniquifier=@AtomicLong[-3282039941672302964],
            nextNextGaussian=@Double[0.0],
            haveNextNextGaussian=@Boolean[false],
            serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
            unsafe=@Unsafe[sun.misc.Unsafe@2eaa1027],
            seedOffset=@Long[24],
        ],
        illegalArgumentCount=@Integer[13159],
    ],
]

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$ watch demo.MathGame primeFactors "{params[0],target}" "params[0]<0"
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 68 ms.
ts=2018-12-03 19:36:04; [cost=0.530255ms] result=@ArrayList[
    @Integer[-18178089],
    @MathGame[demo.MathGame@41cf53f9],
]
# 只有满足条件的调用，才会有响应。

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$ watch demo.MathGame primeFactors "{params[0],throwExp}" -e -x 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 62 ms.
ts=2018-12-03 19:38:00; [cost=1.414993ms] result=@ArrayList[
    @Integer[-1120397038],
    java.lang.IllegalArgumentException: number is: -1120397038, need >= 2
	at demo.MathGame.primeFactors(MathGame.java:46)
	at demo.MathGame.run(MathGame.java:24)
	at demo.MathGame.main(MathGame.java:16)
,
]

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$ watch demo.MathGame primeFactors '{params, returnObj}' '#cost>200' -x 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 66 ms.
ts=2018-12-03 19:40:28; [cost=2112.168897ms] result=@ArrayList[
    @Object[][
        @Integer[1],
    ],
    @ArrayList[
        @Integer[5],
        @Integer[428379493],
    ],
]

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$ watch demo.MathGame primeFactors 'target'
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 52 ms.
ts=2018-12-03 19:41:52; [cost=0.477882ms] result=@MathGame[
    random=@Random[java.util.Random@522b408a],
    illegalArgumentCount=@Integer[13355],
]

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$ watch demo.MathGame primeFactors 'target.illegalArgumentCount'
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 67 ms.
ts=2018-12-03 20:04:34; [cost=131.303498ms] result=@Integer[8]
ts=2018-12-03 20:04:35; [cost=0.961441ms] result=@Integer[8]

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watch demo.MathGame * '{params,@[email protected](100)}' -v -n 1 -x 2
[arthas@6527]$ watch demo.MathGame * '{params,@[email protected](100)}' -n 1 -x 2
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 5) cost in 34 ms, listenerId: 3
ts=2021-01-05 21:35:20; [cost=0.173966ms] result=@ArrayList[
    @Object[][
        @Integer[-138282],
    ],
    @Integer[89],
]

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watch javax.servlet.Filter * --exclude-class-pattern com.demo.TestFilter

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options disable-sub-class true

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$ watch -v -x 2 demo.MathGame print 'params' 'params[0] > 100000'
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 29 ms, listenerId: 11
Condition express: params[0] > 100000 , result: false
Condition express: params[0] > 100000 , result: false
Condition express: params[0] > 100000 , result: true
ts=2020-12-02 22:38:56; [cost=0.060843ms] result=@Object[][
    @Integer[200033],
    @ArrayList[
        @Integer[200033],
    ],
]
Condition express: params[0] > 100000 , result: true
ts=2020-12-02 22:38:57; [cost=0.052877ms] result=@Object[][
    @Integer[123047],
    @ArrayList[
        @Integer[29],
        @Integer[4243],
    ],
]

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$ trace demo.MathGame run
Press Q or Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 28 ms.
`---ts=2019-12-04 00:45:08;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    `---[0.617465ms] demo.MathGame:run()
        `---[0.078946ms] demo.MathGame:primeFactors() #24 [throws Exception]

`---ts=2019-12-04 00:45:09;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    `---[1.276874ms] demo.MathGame:run()
        `---[0.03752ms] demo.MathGame:primeFactors() #24 [throws Exception]

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$ trace demo.MathGame run -m 1
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 412 ms, listenerId: 4
`---ts=2022-12-25 21:00:00;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@b4aac2
    `---[0.762093ms] demo.MathGame:run()
        `---[30.21% 0.230241ms] demo.MathGame:primeFactors() #46 [throws Exception]

`---ts=2022-12-25 21:00:10;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@b4aac2
    `---[0.315298ms] demo.MathGame:run()
        `---[13.95% 0.043995ms] demo.MathGame:primeFactors() #46 [throws Exception]

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trace demo.MathGame run -n 1
Press Q or Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 20 ms.
`---ts=2019-12-04 00:45:53;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    `---[0.549379ms] demo.MathGame:run()
        +---[0.059839ms] demo.MathGame:primeFactors() #24
        `---[0.232887ms] demo.MathGame:print() #25

Command execution times exceed limit: 1, so command will exit. You can set it with -n option.

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$ trace --skipJDKMethod false demo.MathGame run
Press Q or Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 60 ms.
`---ts=2019-12-04 00:44:41;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    `---[1.357742ms] demo.MathGame:run()
        +---[0.028624ms] java.util.Random:nextInt() #23
        +---[0.045534ms] demo.MathGame:primeFactors() #24 [throws Exception]
        +---[0.005372ms] java.lang.StringBuilder:<init>() #28
        +---[0.012257ms] java.lang.Integer:valueOf() #28
        +---[0.234537ms] java.lang.String:format() #28
        +---[min=0.004539ms,max=0.005778ms,total=0.010317ms,count=2] java.lang.StringBuilder:append() #28
        +---[0.013777ms] java.lang.Exception:getMessage() #28
        +---[0.004935ms] java.lang.StringBuilder:toString() #28
        `---[0.06941ms] java.io.PrintStream:println() #28

`---ts=2019-12-04 00:44:42;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    `---[3.030432ms] demo.MathGame:run()
        +---[0.010473ms] java.util.Random:nextInt() #23
        +---[0.023715ms] demo.MathGame:primeFactors() #24 [throws Exception]
        +---[0.005198ms] java.lang.StringBuilder:<init>() #28
        +---[0.006405ms] java.lang.Integer:valueOf() #28
        +---[0.178583ms] java.lang.String:format() #28
        +---[min=0.011636ms,max=0.838077ms,total=0.849713ms,count=2] java.lang.StringBuilder:append() #28
        +---[0.008747ms] java.lang.Exception:getMessage() #28
        +---[0.019768ms] java.lang.StringBuilder:toString() #28
        `---[0.076457ms] java.io.PrintStream:println() #28

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$ trace demo.MathGame run '#cost > 10'
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 41 ms.
`---ts=2018-12-04 01:12:02;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    `---[12.033735ms] demo.MathGame:run()
        +---[0.006783ms] java.util.Random:nextInt()
        +---[11.852594ms] demo.MathGame:primeFactors()
        `---[0.05447ms] demo.MathGame:print()

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trace -E com.test.ClassA|org.test.ClassB method1|method2|method3

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$ trace demo.MathGame run -n 1
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 66 ms, listenerId: 1
`---ts=2021-02-08 11:27:36;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@232204a1
    `---[0.705196ms] demo.MathGame:run()
        +---[0.152743ms] demo.MathGame:primeFactors() #24
        `---[0.145825ms] demo.MathGame:print() #25

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$ trace demo.MathGame run --skipJDKMethod false
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 35 ms, listenerId: 2
`---ts=2021-02-08 11:27:48;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@232204a1
    `---[0.810591ms] demo.MathGame:run()
        +---[0.034568ms] java.util.Random:nextInt() #23
        +---[0.119367ms] demo.MathGame:primeFactors() #24 [throws Exception]
        +---[0.017407ms] java.lang.StringBuilder:<init>() #28
        +---[0.127922ms] java.lang.String:format() #57
        +---[min=0.01419ms,max=0.020221ms,total=0.034411ms,count=2] java.lang.StringBuilder:append() #57
        +---[0.021911ms] java.lang.Exception:getMessage() #57
        +---[0.015643ms] java.lang.StringBuilder:toString() #57
        `---[0.086622ms] java.io.PrintStream:println() #57

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$ stack demo.MathGame primeFactors
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 36 ms.
ts=2018-12-04 01:32:19;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    @demo.MathGame.run()
        at demo.MathGame.main(MathGame.java:16)

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$ stack demo.MathGame primeFactors -m 1
Press Q or Ctrl+C to abort.
Affect(class count:1 , method count:1) cost in 561 ms, listenerId: 5.
ts=2022-12-25 21:07:07;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@b4aac2
    @demo.MathGame.primeFactors()
        at demo.MathGame.run(MathGame.java:46)
        at demo.MathGame.main(MathGame.java:38)

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$ stack demo.MathGame primeFactors 'params[0]<0' -n 2
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 30 ms.
ts=2018-12-04 01:34:27;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    @demo.MathGame.run()
        at demo.MathGame.main(MathGame.java:16)

ts=2018-12-04 01:34:30;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    @demo.MathGame.run()
        at demo.MathGame.main(MathGame.java:16)

Command execution times exceed limit: 2, so command will exit. You can set it with -n option.

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$ stack demo.MathGame primeFactors '#cost>5'
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 35 ms.
ts=2018-12-04 01:35:58;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@3d4eac69
    @demo.MathGame.run()
        at demo.MathGame.main(MathGame.java:16)

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$ tt -t demo.MathGame primeFactors
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 66 ms.
 INDEX   TIMESTAMP            COST(ms)  IS-RET  IS-EXP   OBJECT         CLASS                          METHOD
-------------------------------------------------------------------------------------------------------------------------------------
 1000    2018-12-04 11:15:38  1.096236  false   true     0x4b67cf4d     MathGame                       primeFactors
 1001    2018-12-04 11:15:39  0.191848  false   true     0x4b67cf4d     MathGame                       primeFactors
 1002    2018-12-04 11:15:40  0.069523  false   true     0x4b67cf4d     MathGame                       primeFactors
 1003    2018-12-04 11:15:41  0.186073  false   true     0x4b67cf4d     MathGame                       primeFactors
 1004    2018-12-04 11:15:42  17.76437  true    false    0x4b67cf4d     MathGame

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$ tt -t -m 1 demo.MathGame primeFactors
Press Q or Ctrl+C to abort.
Affect(class count:1 , method count:1) cost in 130 ms, listenerId: 1.
 INDEX   TIMESTAMP            COST(ms)  IS-RET  IS-EXP   OBJECT         CLASS                          METHOD
-------------------------------------------------------------------------------------------------------------------------------------
 1000    2022-12-25 19:41:45  2.629929  true    false    0x3bf400       MathGame                       primeFactors
 1001    2022-12-25 19:41:55  0.146161  false   true     0x3bf400       MathGame

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$ tt -l
 INDEX   TIMESTAMP            COST(ms)  IS-RET  IS-EXP   OBJECT         CLASS                          METHOD
-------------------------------------------------------------------------------------------------------------------------------------
 1000    2018-12-04 11:15:38  1.096236  false   true     0x4b67cf4d     MathGame                       primeFactors
 1001    2018-12-04 11:15:39  0.191848  false   true     0x4b67cf4d     MathGame                       primeFactors
 1002    2018-12-04 11:15:40  0.069523  false   true     0x4b67cf4d     MathGame                       primeFactors
 1003    2018-12-04 11:15:41  0.186073  false   true     0x4b67cf4d     MathGame                       primeFactors
 1004    2018-12-04 11:15:42  17.76437  true    false    0x4b67cf4d     MathGame                       primeFactors
                              9
 1005    2018-12-04 11:15:43  0.4776    false   true     0x4b67cf4d     MathGame                       primeFactors
Affect(row-cnt:6) cost in 4 ms.

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$ tt -s 'method.name=="primeFactors"'
 INDEX   TIMESTAMP            COST(ms)  IS-RET  IS-EXP   OBJECT         CLASS                          METHOD
-------------------------------------------------------------------------------------------------------------------------------------
 1000    2018-12-04 11:15:38  1.096236  false   true     0x4b67cf4d     MathGame                       primeFactors
 1001    2018-12-04 11:15:39  0.191848  false   true     0x4b67cf4d     MathGame                       primeFactors
 1002    2018-12-04 11:15:40  0.069523  false   true     0x4b67cf4d     MathGame                       primeFactors
 1003    2018-12-04 11:15:41  0.186073  false   true     0x4b67cf4d     MathGame                       primeFactors
 1004    2018-12-04 11:15:42  17.76437  true    false    0x4b67cf4d     MathGame                       primeFactors
                              9
 1005    2018-12-04 11:15:43  0.4776    false   true     0x4b67cf4d     MathGame                       primeFactors
Affect(row-cnt:6) cost in 607 ms.

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$ tt -i 1003
 INDEX            1003
 GMT-CREATE       2018-12-04 11:15:41
 COST(ms)         0.186073
 OBJECT           0x4b67cf4d
 CLASS            demo.MathGame
 METHOD           primeFactors
 IS-RETURN        false
 IS-EXCEPTION     true
 PARAMETERS[0]    @Integer[-564322413]
 THROW-EXCEPTION  java.lang.IllegalArgumentException: number is: -564322413, need >= 2
                      at demo.MathGame.primeFactors(MathGame.java:46)
                      at demo.MathGame.run(MathGame.java:24)
                      at demo.MathGame.main(MathGame.java:16)

Affect(row-cnt:1) cost in 11 ms.

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$ tt -i 1004 -p
 RE-INDEX       1004
 GMT-REPLAY     2018-12-04 11:26:00
 OBJECT         0x4b67cf4d
 CLASS          demo.MathGame
 METHOD         primeFactors
 PARAMETERS[0]  @Integer[946738738]
 IS-RETURN      true
 IS-EXCEPTION   false
 COST(ms)         0.186073
 RETURN-OBJ     @ArrayList[
                    @Integer[2],
                    @Integer[11],
                    @Integer[17],
                    @Integer[2531387],
                ]
Time fragment[1004] successfully replayed.
Affect(row-cnt:1) cost in 14 ms.

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tt -d 1001

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tt --delete-all

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profiler start

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$ profiler getSamples
23

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

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# 默认情况下，结果文件是html格式，也可以用--format参数指定：
$ profiler stop --format html
profiler output file: /tmp/test/arthas-output/20211207-111550.html
OK
# 或者在--file参数里用文件名指名格式。比如--file /tmp/result.html 。

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# 在不同的平台，不同的 OS 下面，支持的 events 各有不同。可以使用命令查看：
profiler list

# 可以用--event参数指定要采样的事件，比如对alloc事件进入采样：
profiler start --event alloc

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profiler resume

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profiler execute 'start,framebuf=5000000'

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profiler execute 'stop,file=/tmp/result.html'

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$ profiler actions
Supported Actions: [resume, dumpCollapsed, getSamples, start, list, execute, version, stop, load, dumpFlat, actions, dumpTraces, status]

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$ profiler version
Async-profiler 1.6 built on Sep  9 2019
Copyright 2019 Andrei Pangin

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profiler start --framebuf 5000000

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profiler start --include 'java/*' --include 'demo/*' --exclude '*Unsafe.park*'

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profiler start --duration 300

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profiler start --file /tmp/test.jfr

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$ jfr start
Started recording 1. No limit specified, using maxsize=250MB as default.

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$ jfr start -n myRecording --duration 60s -f /tmp/myRecording.jfr
Started recording 2. The result will be written to:
/tmp/myRecording.jfr

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$ jfr status
Recording: recording=1 name=Recording-1 (running)
Recording: recording=2 name=myRecording duration=PT1M (closed)

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$ jfr status -r 1
Recording: recording=1 name=Recording-1 (running)

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$ jfr status --state closed
Recording: recording=2 name=myRecording duration=PT1M (closed)

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$ jfr dump -r 1 -f /tmp/myRecording1.jfr
Dump recording 1, The result will be written to:
/tmp/myRecording1.jfr

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$ jfr dump -r 1
Dump recording 1, The result will be written to:
/tmp/test/arthas-output/20220819-200915.jfr

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$ jfr stop -r 1
Stop recording 1, The result will be written to:
/tmp/test/arthas-output/20220819-202049.jfr