其实由于Arthas是阿里开源的，中文文档写的非常好，所以也就不用搬了，直接看官方中文文档：
一、Arthas的安装
1、安装非常简单，下载jar包后，java -jar 运行即可：
curl -O java -jar arthas-boot.jar
没有比这更简单的软件了！
2、运行后，交互输入我们需要监控的应用程序的编号即可（自动挂载）：
[root@tcosmo-test-szls-baas01 ~]# java -jar arthas-boot.jar [INFO] arthas-boot version: 3.6.2 [INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER. * [1]: 44919 thingsboard-3.3.1-boot.jar 1 [INFO] Start download arthas from remote server: https://arthas.aliyun.com/download/3.6.2?mirror=aliyun [INFO] Download arthas success. [INFO] arthas home: /root/.arthas/lib/3.6.2/arthas [INFO] Try to attach process 44919 [INFO] Attach process 44919 success. [INFO] arthas-client connect 127.0.0.1 3658 ,---. ,------. ,--------.,--. ,--. ,---. ,---. / O \ | .--. ''--. .--'| '--' | / O \ ' .-' | .-. || '--'.' | | | .--. || .-. |`. `-. | | | || |\ \ | | | | | || | | |.-' | `--' `--'`--' '--' `--' `--' `--'`--' `--'`-----' wiki https://arthas.aliyun.com/doc tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html version 3.6.2 main_class pid 44919 time 2021-06-21 14:27:26
二、简单使用（不断更新）
官方教程肯定是最全的，我这只列举我喜欢用的。
1、dashboard命令：整体看程序的运行情况：
2、如果某个线程异常（CPU过高，死锁等），直接使用：thread #线程号
[arthas@44919]$ thread 41 "transport-consumer-5-thread-1" Id=41 RUNNABLE (in native) at java.base@11.0.12/sun.nio.ch.EPoll.wait(Native Method) at java.base@11.0.12/sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:120) at java.base@11.0.12/sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:124) at java.base@11.0.12/sun.nio.ch.SelectorImpl.select(SelectorImpl.java:136) at org.apache.kafka.common.network.Selector.select(Selector.java:869) at org.apache.kafka.common.network.Selector.poll(Selector.java:465) at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:561) at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:265) at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:236) at org.apache.kafka.clients.consumer.KafkaConsumer.pollForFetches(KafkaConsumer.java:1296) at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1237) at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1210) at org.thingsboard.server.queue.kafka.TbKafkaConsumerTemplate.doPoll(TbKafkaConsumerTemplate.java:91) at org.thingsboard.server.queue.common.AbstractTbQueueConsumerTemplate.poll(AbstractTbQueueConsumerTemplate.java:101) at org.thingsboard.server.common.transport.service.DefaultTransportService.lambda$init$1(DefaultTransportService.java:216) at org.thingsboard.server.common.transport.service.DefaultTransportService$$Lambda$1160/0x0000000800bd7c40.run(Unknown Source) at java.base@11.0.12/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base@11.0.12/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base@11.0.12/java.lang.Thread.run(Thread.java:834)
3、反编译项目代码：jad 包名.类名
[arthas@44919]$ jad org.thingsboard.server.controller.TenantProfileController ClassLoader: +-org.springframework.boot.loader.LaunchedURLClassLoader@4c70fda8 +-jdk.internal.loader.ClassLoaders$AppClassLoader@4b85612c +-jdk.internal.loader.ClassLoaders$PlatformClassLoader@197abec4 Location: file:/tb/thingsboard-3.3.1-boot.jar!/BOOT-INF/classes!/ package org.thingsboard.server.controller; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.http.HttpStatus; import org.springframework.security.access.prepost.PreAuthorize; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.ResponseStatus;
最新代码是否发布成功，一目了然，运维无法狡辩！
4、火焰图：用图形化的方式来展现profiler工具采集的性能数据：
对数据进行统计和分析，方便找出性能热点
[arthas@44919]$ profiler start Profiling started #燃烧个一两分钟差不多 [arthas@44919]$ profiler stop OK profiler output file: /tb/arthas-output/20220621-145221.html
