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arthas的监控java性能
目录
- 1 arthas简介
- 2 arthas下载
- 3 arthas的使用
- 3.1 arthas启动
- 3.2 常用命令
- 3.2.1 dashboard
- 3.2.2 thread
- 3.2.3 jad
- 3.2.4 watch
- 3.2.5 getstatic
- 3.2.6 heapdump
- 3.2.7 jvm
- 3.2.8 logger
- 3.2.9 mbean
- 3.2.10 memory
- 3.2.11 ognl
- 3.2.12 perfcounter
- 3.2.13 sysenv
- 3.2.14 vmoption
- 3.2.15 vmtool
- 3.2.16 classloader
- 3.2.17 dump
- 3.2.18 mc
- 3.2.19 redefine
- 3.2.20 retransform
- 3.2.21 sc
- 3.2.22 sm
- 3.2.23 monitor
- 3.2.24 stack
- 3.2.25 trace
- 3.2.26 tt
- 3.2.27 auth
- 3.2.28 options
- 3.2.29 base64
- 3.2.30 cat
- 3.2.31 cls
- 3.2.32 echo
- 3.2.33 grep
- 3.2.34 help
- 3.2.35 history
- 3.2.36 keymap
- 3.2.37 pwd
- 3.2.38 tee
- 3.2.39 profile
- 3.2.40 session
- 3.2.41 version
- 3.2.42 quit
- 3.2.43 reset
- 3.2.44 stop
1 arthas简介
Arthas 是一款线上监控诊断产品，通过全局视角实时查看应用load、内存、gc、线程的状态信息，并能在不修改应用代码的情况下，对业务问题进行诊断，包括查看方法调用的出入参、异常，监测方法执行耗时，类加载信息等，大大提升线上问题排查效率。
参考地址：
https://arthas.aliyun.com/- 1
2 arthas下载
curl -O https://arthas.aliyun.com/arthas-boot.jar- 1
3 arthas的使用
3.1 arthas启动
$ $ java -jar arthas-boot.jar * [1]: 71560 math-game.jar [2]: 35542- 1
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进程是第 1 个，则输入 1，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 $- 1
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3.2 常用命令
3.2.1 dashboard
$ 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/JavaVir tualMachines/jdk1.8.0 _162.jdk/Contents/Hom e/jre- 1
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3.2.2 thread
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)- 1
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3.2.3 jad
反编译 Main Class
$ jad demo.MathGame ClassLoader: +-sun.misc.Launcher$AppClassLoader@3d4eac69 +-sun.misc.Launcher$ExtClassLoader@66350f69 Location: /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(); List<Integer> 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, List<Integer> primeFactors) { StringBuffer sb = new StringBuffer("" + number + "="); Iterator<Integer> 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 List<Integer> primeFactors(int number) { if (number < 2) { ++this.illegalArgumentCount; throw new IllegalArgumentException("number is: " + number + ", need >= 2"); } ArrayList<Integer> result = new ArrayList<Integer>(); 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.- 1
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3.2.4 watch
查看demo.MathGame#primeFactors函数的返回值
$ watch demo.MathGame primeFactors returnObj Press Ctrl+C to abort. Affect(class-cnt:1 , method-cnt:1) cost in 107 ms. ts=2018-11-28 19:22:30; [cost=1.715367ms] result=null ts=2018-11-28 19:22:31; [cost=0.185203ms] result=null ts=2018-11-28 19:22:32; [cost=19.012416ms] result=@ArrayList[ @Integer[5], @Integer[47], @Integer[2675531], ] ts=2018-11-28 19:22:33; [cost=0.311395ms] result=@ArrayList[ @Integer[2], @Integer[5], @Integer[317], @Integer[503], @Integer[887], ] ts=2018-11-28 19:22:34; [cost=10.136007ms] result=@ArrayList[ @Integer[2], @Integer[2], @Integer[3], @Integer[3], @Integer[31], @Integer[717593], ] ts=2018-11-28 19:22:35; [cost=29.969732ms] result=@ArrayList[ @Integer[5], @Integer[29], @Integer[7651739], ]- 1
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3.2.5 getstatic
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 field: random @Random[ serialVersionUID=@Long[3905348978240129619], seed=@AtomicLong[120955813885284], 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], ]- 1
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3.2.6 heapdump
3.2.6.1 dump到指定的文件
[arthas@58205]$ heapdump /tmp/dump.hprof Dumping heap to /tmp/dump.hprof... Heap dump file created- 1
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3.2.6.2 dump live 对象
[arthas@58205]$ heapdump --live /tmp/dump-live.hprof Dumping heap to /tmp/dump.hprof... Heap dump file created- 1
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3.2.6.3 dump 到临时文件
[arthas@58205]$ heapdump Dumping heap to /var/folders/my/wy7c9w9j5732xbkcyt1mb4g40000gp/T/heapdump2019-09-03-16-385121018449645518991.hprof... Heap dump file created- 1
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3.2.7 jvm
$ jvm RUNTIME -------------------------------------------------------------------------------------------------------------- MACHINE-NAME 37@ff267334bb65 JVM-START-TIME 2020-07-23 07:50:36 MANAGEMENT-SPEC-VERSION 1.2 SPEC-NAME Java Virtual Machine Specification SPEC-VENDOR Oracle Corporation SPEC-VERSION 1.8 VM-NAME Java HotSpot(TM) 64-Bit Server VM VM-VENDOR Oracle Corporation VM-VERSION 25.201-b09 INPUT-ARGUMENTS [] CLASS-PATH demo-arthas-spring-boot.jar BOOT-CLASS-PATH /usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/j re/lib/rt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/sunrsasign.jar:/usr/lib/jvm/ java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/us r/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/l ib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/classes LIBRARY-PATH /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib -------------------------------------------------------------------------------------------------------------- CLASS-LOADING -------------------------------------------------------------------------------------------------------------- LOADED-CLASS-COUNT 7529 TOTAL-LOADED-CLASS-COUNT 7529 UNLOADED-CLASS-COUNT 0 IS-VERBOSE false -------------------------------------------------------------------------------------------------------------- COMPILATION -------------------------------------------------------------------------------------------------------------- NAME HotSpot 64-Bit Tiered Compilers TOTAL-COMPILE-TIME 14921(ms) -------------------------------------------------------------------------------------------------------------- GARBAGE-COLLECTORS -------------------------------------------------------------------------------------------------------------- PS Scavenge name : PS Scavenge [count/time (ms)] collectionCount : 7 collectionTime : 68 PS MarkSweep name : PS MarkSweep [count/time (ms)] collectionCount : 1 collectionTime : 47 -------------------------------------------------------------------------------------------------------------- MEMORY-MANAGERS -------------------------------------------------------------------------------------------------------------- CodeCacheManager Code Cache Metaspace Manager Metaspace Compressed Class Space Copy Eden Space Survivor Space MarkSweepCompact Eden Space Survivor Space Tenured Gen -------------------------------------------------------------------------------------------------------------- MEMORY -------------------------------------------------------------------------------------------------------------- HEAP-MEMORY-USAGE init : 268435456(256.0 MiB) [memory in bytes] used : 18039504(17.2 MiB) committed : 181403648(173.0 MiB) max : 3817865216(3.6 GiB) NO-HEAP-MEMORY-USAGE init : 2555904(2.4 MiB) [memory in bytes] used : 33926216(32.4 MiB) committed : 35176448(33.5 MiB) max : -1(-1 B) -------------------------------------------------------------------------------------------------------------- OPERATING-SYSTEM -------------------------------------------------------------------------------------------------------------- OS Linux ARCH amd64 PROCESSORS-COUNT 3 LOAD-AVERAGE 29.53 VERSION 4.15.0-52-generic -------------------------------------------------------------------------------------------------------------- THREAD -------------------------------------------------------------------------------------------------------------- COUNT 30 DAEMON-COUNT 24 PEAK-COUNT 31 STARTED-COUNT 36 DEADLOCK-COUNT 0 -------------------------------------------------------------------------------------------------------------- FILE-DESCRIPTOR -------------------------------------------------------------------------------------------------------------- MAX-FILE-DESCRIPTOR-COUNT 1048576 OPEN-FILE-DESCRIPTOR-COUNT 100 Affect(row-cnt:0) cost in 88 ms.- 1
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3.2.8 logger
[arthas@2062]$ logger name ROOT class ch.qos.logback.classic.Logger classLoader sun.misc.Launcher$AppClassLoader@2a139a55 classLoaderHash 2a139a55 level INFO effectiveLevel INFO additivity true codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar appenders name CONSOLE class ch.qos.logback.core.ConsoleAppender classLoader sun.misc.Launcher$AppClassLoader@2a139a55 classLoaderHash 2a139a55 target System.out name APPLICATION class ch.qos.logback.core.rolling.RollingFileAppender classLoader sun.misc.Launcher$AppClassLoader@2a139a55 classLoaderHash 2a139a55 file app.log name ASYNC class ch.qos.logback.classic.AsyncAppender classLoader sun.misc.Launcher$AppClassLoader@2a139a55 classLoaderHash 2a139a55 appenderRef [APPLICATION]- 1
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3.2.9 mbean
查看或监控 Mbean 的属性信息。
参数名称 参数说明 name-pattern 名称表达式匹配 attribute-pattern 属性名表达式匹配 [m] 查看元信息 [i:] 刷新属性值的时间间隔 (ms) [n:] 刷新属性值的次数 [E] 开启正则表达式匹配，默认为通配符匹配。仅对属性名有效 3.2.9.1 列出所有 Mbean 的名称
mbean
3.2.9.2 查看 Mbean 的元信息
mbean -m java.lang:type=Threading
3.2.9.3 查看 mbean 属性信息
mbean java.lang:type=Threading
3.2.9.4 mbean 的 name 支持通配符匹配
mbean java.lang:type=Th*
3.2.9.5 通配符匹配特定的属性字段：
mbean java.lang:type=Threading *Count
3.2.9.6 使用-E命令切换为正则匹配：
mbean -E java.lang:type=Threading PeakThreadCount|ThreadCount|DaemonThreadCount
3.2.9.7 使用-i命令实时监控
mbean -i 1000 java.lang:type=Threading *Count
3.2.10 memory
$ memory Memory used total max usage heap 32M 256M 4096M 0.79% g1_eden_space 11M 68M -1 16.18% g1_old_gen 17M 184M 4096M 0.43% g1_survivor_space 4M 4M -1 100.00% nonheap 35M 39M -1 89.55% codeheap_'non-nmethods' 1M 2M 5M 20.53% metaspace 26M 27M -1 96.88% codeheap_'profiled_nmethods' 4M 4M 117M 3.57% compressed_class_space 2M 3M 1024M 0.29% codeheap_'non-profiled_nmethods' 685K 2496K 120032K 0.57% mapped 0K 0K - 0.00% direct 48M 48M - 100.00%- 1
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3.2.11 ognl
参数名称 参数说明 express 执行的表达式 [c:] 执行表达式的 ClassLoader 的 hashcode，默认值是 SystemClassLoader [classLoaderClass:] 指定执行表达式的 ClassLoader 的 class name [x] 结果对象的展开层次，默认值 1 3.2.11.1 通过 hashcode 指定 ClassLoader
$ classloader -t +-BootstrapClassLoader +-jdk.internal.loader.ClassLoaders$PlatformClassLoader@301ec38b +-com.taobao.arthas.agent.ArthasClassloader@472067c7 +-jdk.internal.loader.ClassLoaders$AppClassLoader@4b85612c +-org.springframework.boot.loader.LaunchedURLClassLoader@7f9a81e8 $ ognl -c 7f9a81e8 @org.springframework.boot.SpringApplication@logger @Slf4jLocationAwareLog[ FQCN=@String[org.apache.commons.logging.LogAdapter$Slf4jLocationAwareLog], name=@String[org.springframework.boot.SpringApplication], logger=@Logger[Logger[org.springframework.boot.SpringApplication]], ] $- 1
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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：
$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader @org.springframework.boot.SpringApplication@logger @Slf4jLocationAwareLog[ FQCN=@String[org.apache.commons.logging.LogAdapter$Slf4jLocationAwareLog], name=@String[org.springframework.boot.SpringApplication], logger=@Logger[Logger[org.springframework.boot.SpringApplication]], ]- 1
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3.2.11.2 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}' @ArrayList[ @String[/opt/java/8.0.181-zulu/jre], @String[OpenJDK Runtime Environment], ]- 1
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3.2.12 perfcounter
$ perfcounter java.ci.totalTime 2325637411 java.cls.loadedClasses 3403 java.cls.sharedLoadedClasses 0 java.cls.sharedUnloadedClasses 0 java.cls.unloadedClasses 0 java.property.java.version 11.0.4 java.property.java.vm.info mixed mode java.property.java.vm.name OpenJDK 64-Bit Server VM ...- 1
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3.2.13 sysenv
$ sysenv KEY VALUE ---------------------------------------------------------------------------------------------------------------------------- PATH /Users/admin/.sdkman/candidates/visualvm/current/bin:/Users/admin/.sdkman/candidates/ja va/current/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/Wireshark.app/Contents/ MacOS SDKMAN_VERSION 5.7.3+337 JAVA_HOME /Users/admin/.sdkman/candidates/java/current JAVA_MAIN_CLASS_65244 demo.MathGame TERM xterm-256color LANG zh_CN.UTF-8 AUTOJUMP_SOURCED 1 COLORTERM truecolor LOGNAME admin XPC_SERVICE_NAME 0 PWD /Users/admin/code/ali/arthas/demo TERM_PROGRAM_VERSION 3.2.5 _ /Users/admin/.sdkman/candidates/java/current/bin/java SHELL /bin/bash TERM_PROGRAM iTerm.app SDKMAN_PLATFORM Darwin USER admin ITERM_PROFILE Default TMPDIR /var/folders/0r/k561bkk917gg972stqclbz9h0000gn/T/ XPC_FLAGS 0x0 TERM_SESSION_ID w0t4p0:60BC264D-9649-42AC-A7E4-AF85B69F93F8 __CF_USER_TEXT_ENCODING 0x1F5:0x19:0x34 Apple_PubSub_Socket_Ren /private/tmp/com.apple.launchd.DwmmjSQsll/Render der COLORFGBG 7;0 HOME /Users/admin SHLVL 1 AUTOJUMP_ERROR_PATH /Users/admin/Library/autojump/errors.log- 1
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3.2.14 vmoption
[arthas@56963]$ vmoption KEY VALUE ORIGIN WRITEABLE --------------------------------------------------------------------------------------------- HeapDumpBeforeFullGC false DEFAULT true HeapDumpAfterFullGC false DEFAULT true HeapDumpOnOutOfMemory false DEFAULT true Error HeapDumpPath DEFAULT true CMSAbortablePrecleanW 100 DEFAULT true aitMillis CMSWaitDuration 2000 DEFAULT true CMSTriggerInterval -1 DEFAULT true PrintGC false DEFAULT true PrintGCDetails true MANAGEMENT true PrintGCDateStamps false DEFAULT true PrintGCTimeStamps false DEFAULT true PrintGCID false DEFAULT true PrintClassHistogramBe false DEFAULT true foreFullGC PrintClassHistogramAf false DEFAULT true terFullGC PrintClassHistogram false DEFAULT true MinHeapFreeRatio 0 DEFAULT true MaxHeapFreeRatio 100 DEFAULT true PrintConcurrentLocks false DEFAULT true- 1
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3.2.15 vmtool
$ 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$ValueIterator], @String[java/util/concurrent/locks/LockSupport], ]- 1
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3.2.16 classloader
参数名称 Value [l] 按类加载实例进行统计 [t] 打印所有 ClassLoader 的继承树 [a] 列出所有 ClassLoader 加载的类，请谨慎使用 [c:] ClassLoader 的 hashcode [classLoaderClass:] 指定执行表达式的 ClassLoader 的 class name [c: r:] 用 ClassLoader 去查找 resource [c: load:] 用 ClassLoader 去加载指定的类 3.2.17 dump
参数名称 参数说明 class-pattern 类名表达式匹配 [c:] 类所属 ClassLoader 的 hashcode [classLoaderClass:] 指定执行表达式的 ClassLoader 的 class name [d:] 设置类文件的目标目录 [E] 开启正则表达式匹配，默认为通配符匹配 3.2.18 mc
Memory Compiler/内存编译器，编译.java文件生成.class。
mc /tmp/Test.java- 1
3.2.19 redefine
参数名称 参数说明 [c:] ClassLoader 的 hashcode [classLoaderClass:] 指定执行表达式的 ClassLoader 的 class name 3.2.20 retransform
加载外部的.class文件，retransform jvm 已加载的类
retransform /tmp/Test.class retransform -l retransform -d 1 # delete retransform entry retransform --deleteAll # delete all retransform entries retransform --classPattern demo.* # triger retransform classes retransform -c 327a647b /tmp/Test.class /tmp/Test\$Inner.class retransform --classLoaderClass 'sun.misc.Launcher$AppClassLoader' /tmp/Test.class- 1
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3.2.21 sc
查看 JVM 已加载的类信息
参数名称 参数说明 class-pattern 类名表达式匹配 method-pattern 方法名表达式匹配 [d] 输出当前类的详细信息，包括这个类所加载的原始文件来源、类的声明、加载的 ClassLoader 等详细信息。 如果一个类被多个 ClassLoader 所加载，则会出现多次 [E] 开启正则表达式匹配，默认为通配符匹配 [f] 输出当前类的成员变量信息（需要配合参数-d 一起使用） [x:] 指定输出静态变量时属性的遍历深度，默认为 0，即直接使用 toString 输出 [c:] 指定 class 的 ClassLoader 的 hashcode [classLoaderClass:] 指定执行表达式的 ClassLoader 的 class name [n:] 具有详细信息的匹配类的最大数量（默认为 100） 3.2.22 sm
参数名称 参数说明 class-pattern 类名表达式匹配 method-pattern 方法名表达式匹配 [d] 展示每个方法的详细信息 [E] 开启正则表达式匹配，默认为通配符匹配 [c:] 指定 class 的 ClassLoader 的 hashcode [classLoaderClass:] 指定执行表达式的 ClassLoader 的 class name [n:] 具有详细信息的匹配类的最大数量（默认为 100） 3.2.23 monitor
参数名称 参数说明 class-pattern 类名表达式匹配 method-pattern 方法名表达式匹配 condition-express 条件表达式 [E] 开启正则表达式匹配，默认为通配符匹配 [c:] 统计周期，默认值为 120 秒 [b] 在方法调用之前计算 condition-express 3.2.24 stack
参数名称 参数说明 class-pattern 类名表达式匹配 method-pattern 方法名表达式匹配 condition-express 条件表达式 [E] 开启正则表达式匹配，默认为通配符匹配 [n:] 执行次数限制 3.2.25 trace
参数名称 参数说明 class-pattern 类名表达式匹配 method-pattern 方法名表达式匹配 condition-express 条件表达式 [E] 开启正则表达式匹配，默认为通配符匹配 [n:] 命令执行次数 #cost 方法执行耗时 3.2.26 tt
$ 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- 1
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3.2.27 auth
[arthas@37430]$ auth ppp Authentication result: true- 1
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3.2.28 options
$ options LEVEL TYPE NAME VALUE SUMMARY DESCRIPTION ------------------------------------------------------------------------------------------------------- 0 boolea unsafe false Option to support sy This option enables to proxy functionality n stem-level class of JVM classes. Due to serious security r isk a JVM crash is possibly be introduced. Do not activate it unless you are able to manage. 1 boolea dump false Option to dump the e This option enables the enhanced classes t n nhanced classes o be dumped to external file for further d e-compilation and analysis. 1 boolea batch-re-tra true Option to support ba This options enables to reTransform classe n nsform tch reTransform Clas s with batch mode. s 2 boolea json-format false Option to support JS This option enables to format object outpu n ON format of object t with JSON when -x option selected. output 1 boolea disable-sub- false Option to control in This option disable to include sub class w n class clude sub class when hen matching class. class matching 1 boolea support-defa true Option to control in This option disable to include default met n ult-method clude default method hod in interface when matching class. in interface when c lass matching 1 boolea save-result false Option to print comm This option enables to save each command's n and's result to log result to log file, which path is ${user. file home}/logs/arthas-cache/result.log. 2 String job-timeout 1d Option to job timeou This option setting job timeout,The unit c t an be d, h, m, s for day, hour, minute, se cond. 1d is one day in default 1 boolea print-parent true Option to print all This option enables print files in parent n -fields fileds in parent cla class, default value true. ss 1 boolea verbose false Option to print verb This option enables print verbose informat n ose information ion, default value false. 1 boolea strict true Option to strict mod By default, strict mode is true, not allow n e ed to set object properties. Want to set o bject properties, execute `options strict false`- 1
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3.2.29 base64
[arthas@70070]$ echo 'abc' > /tmp/test.txt [arthas@70070]$ cat /tmp/test.txt abc [arthas@70070]$ base64 /tmp/test.txt YWJjCg==- 1
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3.2.30 cat
$ cat /tmp/a.txt- 1
3.2.31 cls
清空当前屏幕区域
3.2.32 echo
打印参数，和 linux 里的 echo 命令类似。
3.2.33 grep
类似传统的grep命令。
3.2.34 help
[help 指令]的等同于[指令 -help]，都是查看具体指令的使用说明。
3.2.35 history
3.2.35.1 查看最近执行的3条指令
$ history 3 269 thread 270 cls 271 history 3- 1
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3.2.35.2 清空指令
$ history -c $ history 3 1 history 3- 1
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3.2.36 keymap
keymap命令输出当前的快捷键映射表
3.2.37 pwd
返回当前的工作目录，和 linux 命令类似
3.2.38 tee
tee 指令会从标准输入设备读取数据，将其内容输出到标准输出设备，同时保存成文件。
3.2.39 profile
[arthas@25575]$ profiler start Profiling started [arthas@25575]$ profiler getSamples 291 [arthas@25575]$ profiler status Profiling is running for 39 seconds [arthas@25575]$ profiler stop OK profiler output file: /data/src/flume/teflume-prod/apache-flume-1.9.0-bin/arthas-output/20220621-161810.html- 1
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3.2.40 session
如果配置了 tunnel server，会追加打印 代理 id、tunnel 服务器的 url 以及连接状态。使用了 staturl 做统计，会追加显示 statUrl 地址。
$ session Name Value -------------------------------------------------- JAVA_PID 14584 SESSION_ID c2073d3b-443a-4a9b-9249-0c5d24a5756c- 1
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3.2.41 version
输出当前目标 Java 进程所加载的 Arthas 版本号。
$ version 3.5.1- 1
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3.2.42 quit
退出当前 Arthas 客户端，其他 Arthas 客户端不受影响。等同于exit、logout、q三个指令。
3.2.43 reset
重置增强类，将被 Arthas 增强过的类全部还原，Arthas 服务端stop时会重置所有增强过的类。
3.2.43.1 还原指定类
$ trace Test test Press Ctrl+C to abort. Affect(class-cnt:1 , method-cnt:1) cost in 57 ms. `---ts=2017-10-26 17:10:33;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@14dad5dc `---[0.590102ms] Test:test() `---ts=2017-10-26 17:10:34;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@14dad5dc `---[0.068692ms] Test:test() $ reset Test Affect(class-cnt:1 , method-cnt:0) cost in 11 ms.- 1
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3.2.43.2 还原所有类
$ trace Test test Press Ctrl+C to abort. Affect(class-cnt:1 , method-cnt:1) cost in 15 ms. `---ts=2017-10-26 17:12:06;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@14dad5dc `---[0.128518ms] Test:test() $ reset Affect(class-cnt:1 , method-cnt:0) cost in 9 ms- 1
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3.2.44 stop
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。
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- 原文地址：https://blog.csdn.net/u013916029/article/details/127869023
