复兴企业做网站推广,一个好的网站建设需要多少钱,娱乐城网站模板,html5视频播放器插件jvm调优工具arthas(阿尔萨斯)安装与使用—实践
Arthas 是Alibaba开源的Java诊断工具#xff0c;深受开发者喜爱。
当你遇到以下类似问题而束手无策时#xff0c;Arthas可以帮助你解决#xff1a;
这个类从哪个 jar 包加载的#xff1f;为什么会报各种类相关的 Exception…jvm调优工具arthas(阿尔萨斯)安装与使用—实践
Arthas 是Alibaba开源的Java诊断工具深受开发者喜爱。
当你遇到以下类似问题而束手无策时Arthas可以帮助你解决
这个类从哪个 jar 包加载的为什么会报各种类相关的 Exception我改的代码为什么没有执行到难道是我没 commit分支搞错了遇到问题无法在线上 debug难道只能通过加日志再重新发布吗线上遇到某个用户的数据处理有问题但线上同样无法 debug线下无法重现是否有一个全局视角来查看系统的运行状况有什么办法可以监控到JVM的实时运行状态怎么快速定位应用的热点生成火焰图怎样直接从JVM内查找某个类的实例
Arthas支持JDK 64.x 版本不再支持 JDK 6 和 JDK 7支持Linux/Mac/Windows采用命令行交互模式同时提供丰富的 Tab 自动补全功能进一步方便进行问题的定位和诊断。
官方文档
1. 启动 math-game
curl -O https://arthas.aliyun.com/math-game.jar
java -jar math-game.jarmath-game是一个简单的程序每隔一秒生成一个随机数再执行质因数分解并打印出分解结果。
2. 启动 arthas
在命令行下面执行使用和目标进程一致的用户启动否则可能 attach 失败
curl -O https://arthas.aliyun.com/arthas-boot.jar
java -jar arthas-boot.jar执行该程序的用户需要和目标进程具有相同的权限。比如以admin用户来执行sudo su admin java -jar arthas-boot.jar 或 sudo -u admin -EH java -jar arthas-boot.jar。如果 attach 不上目标进程可以查看~/logs/arthas/ 目录下的日志。如果下载速度比较慢可以使用 aliyun 的镜像java -jar arthas-boot.jar --repo-mirror aliyun --use-httpjava -jar arthas-boot.jar -h 打印更多参数信息。
选择应用 java 进程
$ $ java -jar arthas-boot.jar
* [1]: 35542[2]: 71560 math-game.jarmath-game进程是第 2 个则输入 2再输入回车/enter。Arthas 会 attach 到目标进程上并输出日志
[INFO] Try to attach process 71560
[INFO] Attach process 71560 success.
[INFO] arthas-client connect 127.0.0.1 3658,---. ,------. ,--------.,--. ,--. ,---. ,---./ O \ | .--. --. .--| -- | / O \ .-
| .-. || --. | | | .--. || .-. |. -.
| | | || |\ \ | | | | | || | | |.- |
-- ---- -- -- -- ---- -------wiki: https://arthas.aliyun.com/doc
version: 3.0.5.20181127201536
pid: 71560
time: 2018-11-28 19:16:24$3. 查看 dashboard
输入dashboard按回车/enter会展示当前进程的信息按ctrlc可以中断执行。
$ dashboard
ID NAME GROUP PRIORI STATE %CPU TIME INTERRU DAEMON
17 pool-2-thread-1 system 5 WAITIN 67 0:0 false false
27 Timer-for-arthas-dashb system 10 RUNNAB 32 0:0 false true
11 AsyncAppender-Worker-a system 9 WAITIN 0 0:0 false true
9 Attach Listener system 9 RUNNAB 0 0:0 false true
3 Finalizer system 8 WAITIN 0 0:0 false true
2 Reference Handler system 10 WAITIN 0 0:0 false true
4 Signal Dispatcher system 9 RUNNAB 0 0:0 false true
26 as-command-execute-dae system 10 TIMED_ 0 0:0 false true
13 job-timeout system 9 TIMED_ 0 0:0 false true
1 main main 5 TIMED_ 0 0:0 false false
14 nioEventLoopGroup-2-1 system 10 RUNNAB 0 0:0 false false
18 nioEventLoopGroup-2-2 system 10 RUNNAB 0 0:0 false false
23 nioEventLoopGroup-2-3 system 10 RUNNAB 0 0:0 false false
15 nioEventLoopGroup-3-1 system 10 RUNNAB 0 0:0 false false
Memory used total max usage GC
heap 32M 155M 1820M 1.77% gc.ps_scavenge.count 4
ps_eden_space 14M 65M 672M 2.21% gc.ps_scavenge.time(m 166
ps_survivor_space 4M 5M 5M s)
ps_old_gen 12M 85M 1365M 0.91% gc.ps_marksweep.count 0
nonheap 20M 23M -1 gc.ps_marksweep.time( 0
code_cache 3M 5M 240M 1.32% ms)
Runtime
os.name Mac OS X
os.version 10.13.4
java.version 1.8.0_162
java.home /Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre4. 通过 thread 命令来获取到math-game进程的 Main Class
thread 1会打印线程 ID 1 的栈通常是 main 函数的线程。
$ thread 1 | grep main(at demo.MathGame.main(MathGame.java:17)5. 通过 jad 来反编译 Main Class
$ jad demo.MathGameClassLoader:
-sun.misc.Launcher$AppClassLoader3d4eac69-sun.misc.Launcher$ExtClassLoader66350f69Location:
/tmp/math-game.jar/** Decompiled with CFR 0_132.*/
package demo;import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;public class MathGame {private static Random random new Random();private int illegalArgumentCount 0;public static void main(String[] args) throws InterruptedException {MathGame game new MathGame();do {game.run();TimeUnit.SECONDS.sleep(1L);} while (true);}public void run() throws InterruptedException {try {int number random.nextInt();ListInteger primeFactors this.primeFactors(number);MathGame.print(number, primeFactors);}catch (Exception e) {System.out.println(String.format(illegalArgumentCount:%3d, , this.illegalArgumentCount) e.getMessage());}}public static void print(int number, ListInteger primeFactors) {StringBuffer sb new StringBuffer( number );IteratorInteger iterator primeFactors.iterator();while (iterator.hasNext()) {int factor iterator.next();sb.append(factor).append(*);}if (sb.charAt(sb.length() - 1) *) {sb.deleteCharAt(sb.length() - 1);}System.out.println(sb);}public ListInteger primeFactors(int number) {if (number 2) {this.illegalArgumentCount;throw new IllegalArgumentException(number is: number , need 2);}ArrayListInteger result new ArrayListInteger();int i 2;while (i number) {if (number % i 0) {result.add(i);number / i;i 2;continue;}i;}return result;}
}Affect(row-cnt:1) cost in 970 ms.6. watch
通过watch命令来查看demo.MathGame#primeFactors函数的返回值
$ watch demo.MathGame primeFactors returnObj
Press CtrlC to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 107 ms.
ts2018-11-28 19:22:30; [cost1.715367ms] resultnull
ts2018-11-28 19:22:31; [cost0.185203ms] resultnull
ts2018-11-28 19:22:32; [cost19.012416ms] resultArrayList[Integer[5],Integer[47],Integer[2675531],
]
ts2018-11-28 19:22:33; [cost0.311395ms] resultArrayList[Integer[2],Integer[5],Integer[317],Integer[503],Integer[887],
]
ts2018-11-28 19:22:34; [cost10.136007ms] resultArrayList[Integer[2],Integer[2],Integer[3],Integer[3],Integer[31],Integer[717593],
]
ts2018-11-28 19:22:35; [cost29.969732ms] resultArrayList[Integer[5],Integer[29],Integer[7651739],
]7. 退出 arthas
如果只是退出当前的连接可以用quit或者exit命令。Attach 到目标进程上的 arthas 还会继续运行端口会保持开放下次连接时可以直接连接上。
如果想完全退出 arthas可以执行stop命令。
参考文档 在线教程(推荐) 用户文档 安装 下载 快速入门 进阶使用 命令列表 WebConsole Docker Arthas Spring Boot Starter 用户案例 FAQ/常见问题 编译调试/参与贡献 Release Notes
案例展示
Dashboard
https://arthas.aliyun.com/doc/dashboard
Thread
https://arthas.aliyun.com/doc/thread
一目了然的了解系统的状态哪些线程比较占cpu他们到底在做什么
$ thread -n 3
as-command-execute-daemon Id29 cpuUsage75% RUNNABLEat sun.management.ThreadImpl.dumpThreads0(Native Method)at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)at com.taobao.arthas.core.command.monitor200.ThreadCommand$1.action(ThreadCommand.java:58)at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute(AbstractCommandHandler.java:238)at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand(DefaultCommandHandler.java:67)at com.taobao.arthas.core.server.ArthasServer$4.run(ArthasServer.java:276)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at java.lang.Thread.run(Thread.java:745)Number of locked synchronizers 1- java.util.concurrent.ThreadPoolExecutor$Worker6cd0b6f8as-session-expire-daemon Id25 cpuUsage24% TIMED_WAITINGat java.lang.Thread.sleep(Native Method)at com.taobao.arthas.core.server.DefaultSessionManager$2.run(DefaultSessionManager.java:85)Reference Handler Id2 cpuUsage0% WAITING on java.lang.ref.Reference$Lock69ba0f27at java.lang.Object.wait(Native Method)- waiting on java.lang.ref.Reference$Lock69ba0f27at java.lang.Object.wait(Object.java:503)at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)jad
https://arthas.aliyun.com/doc/jad
对类进行反编译:
$ jad javax.servlet.ServletClassLoader:
-java.net.URLClassLoader6108b2d7-sun.misc.Launcher$AppClassLoader18b4aac2-sun.misc.Launcher$ExtClassLoader1ddf84b8Location:
/Users/xxx/work/test/lib/servlet-api.jar/** Decompiled with CFR 0_122.*/
package javax.servlet;import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;public interface Servlet {public void init(ServletConfig var1) throws ServletException;public ServletConfig getServletConfig();public void service(ServletRequest var1, ServletResponse var2) throws ServletException, IOException;public String getServletInfo();public void destroy();
}mc
https://arthas.aliyun.com/doc/mc
Memory Compiler/内存编译器编译.java文件生成.class。
mc /tmp/Test.javaretransform
https://arthas.aliyun.com/doc/retransform
加载外部的.class文件retransform 热更新jvm已加载的类。
retransform /tmp/Test.class
retransform -c 327a647b /tmp/Test.class /tmp/Test\$Inner.classsc
https://arthas.aliyun.com/doc/sc
查找JVM中已经加载的类
$ sc -d org.springframework.web.context.support.XmlWebApplicationContextclass-info org.springframework.web.context.support.XmlWebApplicationContextcode-source /Users/xxx/work/test/WEB-INF/lib/spring-web-3.2.11.RELEASE.jarname org.springframework.web.context.support.XmlWebApplicationContextisInterface falseisAnnotation falseisEnum falseisAnonymousClass falseisArray falseisLocalClass falseisMemberClass falseisPrimitive falseisSynthetic falsesimple-name XmlWebApplicationContextmodifier publicannotationinterfacessuper-class -org.springframework.web.context.support.AbstractRefreshableWebApplicationContext-org.springframework.context.support.AbstractRefreshableConfigApplicationContext-org.springframework.context.support.AbstractRefreshableApplicationContext-org.springframework.context.support.AbstractApplicationContext-org.springframework.core.io.DefaultResourceLoader-java.lang.Objectclass-loader -org.apache.catalina.loader.ParallelWebappClassLoader-java.net.URLClassLoader6108b2d7-sun.misc.Launcher$AppClassLoader18b4aac2-sun.misc.Launcher$ExtClassLoader1ddf84b8classLoaderHash 25131501vmtool
https://arthas.aliyun.com/doc/vmtool
从JVM heap中获取指定类的实例。
$ vmtool --action getInstances --className java.lang.String --limit 10
String[][String[com/taobao/arthas/core/shell/session/Session],String[com.taobao.arthas.core.shell.session.Session],String[com/taobao/arthas/core/shell/session/Session],String[com/taobao/arthas/core/shell/session/Session],String[com/taobao/arthas/core/shell/session/Session.class],String[com/taobao/arthas/core/shell/session/Session.class],String[com/taobao/arthas/core/shell/session/Session.class],String[com/],String[java/util/concurrent/ConcurrentHashMap$ValueIterator],String[java/util/concurrent/locks/LockSupport],
]stack
https://arthas.aliyun.com/doc/stack
查看方法 test.arthas.TestStack#doGet 的调用堆栈
$ stack test.arthas.TestStack doGet
Press CtrlC to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 286 ms.
ts2018-09-18 10:11:45;thread_namehttp-bio-8080-exec-10;idd9;is_daemontrue;priority5;TCCLorg.apache.catalina.loader.ParallelWebappClassLoader25131501test.arthas.TestStack.doGet()at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)...at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:451)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1121)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)Trace
https://arthas.aliyun.com/doc/trace
观察方法执行的时候哪个子调用比较慢:
Watch
https://arthas.aliyun.com/doc/watch
观察方法 test.arthas.TestWatch#doGet 执行的入参仅当方法抛出异常时才输出。
$ watch test.arthas.TestWatch doGet {params[0], throwExp} -e
Press CtrlC to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 65 ms.
ts2018-09-18 10:26:28;resultArrayList[RequestFacade[org.apache.catalina.connector.RequestFacade79f922b2],NullPointerException[java.lang.NullPointerException],
]Monitor
https://arthas.aliyun.com/doc/monitor
监控某个特殊方法的调用统计数据包括总调用次数平均rt成功率等信息每隔5秒输出一次。
$ monitor -c 5 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello
Press CtrlC to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 109 ms.timestamp class method total success fail avg-rt(ms) fail-rate
----------------------------------------------------------------------------------------------------------------------------2018-09-20 09:45:32 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.67 0.00%timestamp class method total success fail avg-rt(ms) fail-rate
----------------------------------------------------------------------------------------------------------------------------2018-09-20 09:45:37 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 1.00 0.00%timestamp class method total success fail avg-rt(ms) fail-rate
----------------------------------------------------------------------------------------------------------------------------2018-09-20 09:45:42 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.43 0.00%Time Tunnel(tt)
https://arthas.aliyun.com/doc/tt
记录方法调用信息支持事后查看方法调用的参数返回值抛出的异常等信息仿佛穿越时空隧道回到调用现场一般。
$ tt -t org.apache.dubbo.demo.provider.DemoServiceImpl sayHello
Press CtrlC to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 75 ms.INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
-------------------------------------------------------------------------------------------------------------------------------------1000 2018-09-20 09:54:10 1.971195 true false 0x55965cca DemoServiceImpl sayHello1001 2018-09-20 09:54:11 0.215685 true false 0x55965cca DemoServiceImpl sayHello1002 2018-09-20 09:54:12 0.236303 true false 0x55965cca DemoServiceImpl sayHello1003 2018-09-20 09:54:13 0.159598 true false 0x55965cca DemoServiceImpl sayHello1004 2018-09-20 09:54:14 0.201982 true false 0x55965cca DemoServiceImpl sayHello1005 2018-09-20 09:54:15 0.214205 true false 0x55965cca DemoServiceImpl sayHello1006 2018-09-20 09:54:16 0.241863 true false 0x55965cca DemoServiceImpl sayHello1007 2018-09-20 09:54:17 0.305747 true false 0x55965cca DemoServiceImpl sayHello1008 2018-09-20 09:54:18 0.18468 true false 0x55965cca DemoServiceImpl sayHelloClassloader
https://arthas.aliyun.com/doc/classloader
了解当前系统中有多少类加载器以及每个加载器加载的类数量帮助您判断是否有类加载器泄露。
$ classloadername numberOfInstances loadedCountTotalBootstrapClassLoader 1 3346com.taobao.arthas.agent.ArthasClassloader 1 1262java.net.URLClassLoader 2 1033org.apache.catalina.loader.ParallelWebappClassLoader 1 628sun.reflect.DelegatingClassLoader 166 166sun.misc.Launcher$AppClassLoader 1 31com.alibaba.fastjson.util.ASMClassLoader 6 15sun.misc.Launcher$ExtClassLoader 1 7org.jvnet.hk2.internal.DelegatingClassLoader 2 2sun.reflect.misc.MethodUtil 1 1Web Console
https://arthas.aliyun.com/doc/web-console Profiler/FlameGraph/火焰图
https://arthas.aliyun.com/doc/profiler
$ profiler start
Started [cpu] profiling$ profiler stop
profiler output file: /tmp/demo/arthas-output/20211207-111550.html
OK通过浏览器查看profiler结果 Arthas Spring Boot Starter
Arthas Spring Boot Starter
