文档 Arthas 用户文档
启动 1 2 wget https://alibaba.github.io/arthas/arthas-boot.jar java -jar arthas-boot.jar
命令 dashboard 查看当前java进程的实时数据面板
thread 查看当前线程信息
classloader 类加载器信息
按类加载类型查看统计信息
查看ClassLoader统计信息和实例hash
查看ClassLoader的继承树
ognl 执行ognl表达式
执行静态方法
1 ognl '@java.lang.Math@abs(-1)'
获取静态变量
1 ognl '@java.lang.System@out'
执行对象方法
1 ognl '#date=new java.util.Date(),#date.setTime(1),#date.getTime()'
指定ClassLoader执行静态方法
ognl默认使用SystemClassLoader，非默认加载器加载的Class无法读取，需要通过sc -d com.sz.Test（推荐）或者classloader -l命令获取加载该CLass的类加载器的hash后，指定hash执行静态方法
1 ognl -c 439f5b3d '@com.sz.Test@log.info("test")'
sc 查看JVM已加载的类信息
模糊搜索已加载的类
打印类的详细信息
jad 反编译指定已加载类的源码
反编译输出到文件
1 jad com.sz.Test > /opt/Test.java
monitor 方法执行监控
每5秒输出方法的访问次数
1 monitor -c 5 com.sz.Test test
watch 输出方法出参和返回值
1 watch com.sz.Test test "{params,returnObj}" -x 3
条件表达式过滤
1 watch com.sz.Test test "{params,returnObj}" "params[1]==5" -x 3
异常输出
1 watch com.sz.Test test "{params[0],throwExp}" -e -x 2
火焰图
启动profiler1 2 3 # 基于CPU使用率采样(适用于CPU密集型) $ profiler start Started [cpu] profiling
1 2 3 # 基于样本采样,可估算耗时(适用于IO密集型) $ profiler start -e wall Started [wall] profiling
获取已采集的sample的数量
1 2 $ profiler getSamples 23
查看profiler状态
1 2 $ profiler status [cpu] profiling is running for 4 seconds
生成svg格式结果
1 2 3 $ profiler stop profiler output file: /tmp/demo/arthas-output/20191125-135546.svg OK
tt 方法执行数据的隧道
记录方法调用的环境现场
输出
1 2 3 INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD --------------------------------------------------------------------------------------------------- 1000 2019-04-05 15:49:28 17.526337 true false 0x6c03fb16 Test test
通过环境现场的index获取方法对象
1 tt -i 1000 -w 'target.log.info("hello world")'
Alibaba Arthas实践–获取到Spring Context，然后为所欲为
trace 方法内部调用路径，并输出方法路径上的每个节点上耗时
输出耗时大于100ms的调用路径
1 trace org.springframework.web.servlet.DispatcherServlet * '#cost > 100'
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 Affect(class count: 1 , method count: 44) cost in 356 ms, listenerId: 5 `---ts=2021-03-19 09:39:50;thread_name=http-nio-8088-exec-7;id=64;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@59b98152 `---[527.902147ms] org.springframework.web.servlet.DispatcherServlet:doService() +---[0.00661ms] org.apache.commons.logging.Log:isDebugEnabled() #889 +---[0.007177ms] org.springframework.web.util.WebUtils:isIncludeRequest() #898 +---[0.006119ms] org.springframework.web.servlet.DispatcherServlet:getWebApplicationContext() #910 +---[min=0.00399ms,max=0.00549ms,total=0.013975ms,count=3] javax.servlet.http.HttpServletRequest:setAttribute() #95 +---[0.004205ms] javax.servlet.http.HttpServletRequest:setAttribute() #911 +---[0.003514ms] javax.servlet.http.HttpServletRequest:setAttribute() #912 +---[0.04213ms] org.springframework.web.servlet.DispatcherServlet:getThemeSource() #913 | `---[0.024214ms] org.springframework.web.servlet.DispatcherServlet:getThemeSource() | +---[0.004096ms] org.springframework.web.servlet.DispatcherServlet:getWebApplicationContext() #782 | `---[0.004078ms] org.springframework.web.servlet.DispatcherServlet:getWebApplicationContext() #95 +---[0.015018ms] org.springframework.web.servlet.FlashMapManager:retrieveAndUpdate() #916 +---[0.005817ms] org.springframework.web.servlet.FlashMap:<init>() #920 +---[0.003581ms] javax.servlet.http.HttpServletRequest:setAttribute() #921 +---[527.660569ms] org.springframework.web.servlet.DispatcherServlet:doDispatch() #925 | `---[527.641089ms] org.springframework.web.servlet.DispatcherServlet:doDispatch() | +---[0.00552ms] org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager() #953 | +---[0.034196ms] org.springframework.web.servlet.DispatcherServlet:checkMultipart() #960 | | `---[0.018654ms] org.springframework.web.servlet.DispatcherServlet:checkMultipart() | | `---[0.007299ms] org.springframework.web.multipart.MultipartResolver:isMultipart() #1117 | +---[0.344646ms] org.springframework.web.servlet.DispatcherServlet:getHandler() #964 | | `---[0.318626ms] org.springframework.web.servlet.DispatcherServlet:getHandler() | | +---[min=0.003103ms,max=0.003579ms,total=0.006682ms,count=2] org.apache.commons.logging.Log:isTraceEnabled() #1184 | | `---[min=0.044735ms,max=0.229457ms,total=0.274192ms,count=2] org.springframework.web.servlet.HandlerMapping:getHandler() #1188 | +---[0.005121ms] org.springframework.web.servlet.HandlerExecutionChain:getHandler() #971 | +---[0.044803ms] org.springframework.web.servlet.DispatcherServlet:getHandlerAdapter() #95 | | `---[0.027969ms] org.springframework.web.servlet.DispatcherServlet:getHandlerAdapter() | | +---[0.004322ms] org.apache.commons.logging.Log:isTraceEnabled() #1225 | | `---[0.006146ms] org.springframework.web.servlet.HandlerAdapter:supports() #1228 | +---[0.003523ms] javax.servlet.http.HttpServletRequest:getMethod() #974 | +---[0.003492ms] org.springframework.web.servlet.HandlerExecutionChain:getHandler() #977 | +---[0.00555ms] org.springframework.web.servlet.HandlerAdapter:getLastModified() #95 | +---[0.003345ms] org.apache.commons.logging.Log:isDebugEnabled() #978 | +---[0.00582ms] org.springframework.web.context.request.ServletWebRequest:<init>() #981 | +---[0.01446ms] org.springframework.web.context.request.ServletWebRequest:checkNotModified() #95 | +---[2.956797ms] org.springframework.web.servlet.HandlerExecutionChain:applyPreHandle() #986 | +---[0.008488ms] org.springframework.web.servlet.HandlerExecutionChain:getHandler() #991 | +---[523.914178ms] org.springframework.web.servlet.HandlerAdapter:handle() #95 | +---[0.005795ms] org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted() #993 | +---[0.044017ms] org.springframework.web.servlet.DispatcherServlet:applyDefaultViewName() #997 | | `---[0.012355ms] org.springframework.web.servlet.DispatcherServlet:applyDefaultViewName() | +---[0.012352ms] org.springframework.web.servlet.HandlerExecutionChain:applyPostHandle() #998 | +---[0.075111ms] org.springframework.web.servlet.DispatcherServlet:processDispatchResult() #1008 | | `---[0.056069ms] org.springframework.web.servlet.DispatcherServlet:processDispatchResult() | | +---[0.005093ms] org.apache.commons.logging.Log:isDebugEnabled() #1075 | | +---[0.007475ms] org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager() #1081 | | +---[0.00442ms] org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted() #95 | | `---[0.00794ms] org.springframework.web.servlet.HandlerExecutionChain:triggerAfterCompletion() #1087 | `---[0.004107ms] org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted() #1018 +---[0.006615ms] org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager() #928 `---[0.004469ms] org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted() #95
常见问题 需要监控31299 进程，输入 2 回车后，监控到了 1进程 23873