Arthas trace 命令讲解如何查看方法耗时

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Arthas trace 命令讲解如何查看方法耗时

前言

public static int wuyifantime() {    final int sleepTime = 1000 * 60 * new Random().nextInt(3);    try {        // 0 分钟到 3 分钟        Thread.sleep(sleepTime);    } catch (InterruptedException e) {        e.printStackTrace();    }    changeobject();    return sleepTime;}public static void changeobject() {    try {        Thread.sleep(200);    } catch (InterruptedException e) {        e.printStackTrace();    }    testgt18();}public static void testgt18() {    try {        Thread.sleep(200);    } catch (InterruptedException e) {        e.printStackTrace();    }}
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TRACE 命令学习

USAGE:                                                                                                                                                                                                      trace [--exclude-class-pattern <value>] [-h] [-n <value>] [--listenerId <value>] [-p <value>] [-E] [--skipJDKMethod <value>] [-v] class-pattern method-pattern [condition-express]                      SUMMARY:                                                                                                                                                                                                    Trace the execution time of specified method invocation.                                                                                                                                                  The express may be one of the following expression (evaluated dynamically):                                                                                                                                       target : the object                                                                                                                                                                                        clazz : the object's class                                                                                                                                                                               method : the constructor or method                                                                                                                                                                        params : the parameters array of method                                                                                                                                                             params[0..n] : the element of parameters array                                                                                                                                                               returnObj : the returned object of method                                                                                                                                                                  throwExp : the throw exception of method                                                                                                                                                                  isReturn : the method ended by return                                                                                                                                                                      isThrow : the method ended by throwing exception                                                                                                                                                            #cost : the execution time in ms of method invocation                                                                                                                                          EXAMPLES:                                                                                                                                                                                                   trace org.apache.commons.lang.StringUtils isBlank                                                                                                                                                         trace *StringUtils isBlank                                                                                                                                                                                trace *StringUtils isBlank params[0].length==1                                                                                                                                                            trace *StringUtils isBlank '#cost>100'                                                                                                                                                                    trace -E org\\.apache\\.commons\\.lang\\.StringUtils isBlank                                                                                                                                              trace -E com.test.ClassA|org.test.ClassB method1|method2|method3                                                                                                                                          trace demo.MathGame run -n 5                                                                                                                                                                              trace demo.MathGame run --skipJDKMethod false                                                                                                                                                             trace javax.servlet.Filter * --exclude-class-pattern com.demo.TestFilter                                                                                                                                WIKI:                                                                                                                                                                                                       https://arthas.aliyun.com/doc/trace                                                                                                                                                                     OPTIONS:                                                                                                                                                                                                      --exclude-class-pattern <value>                                exclude class name pattern, use either '.' or '/' as separator                                                                         -h, --help                                                         this help                                                                                                                              -n, --limits <value>                                               Threshold of execution times                                                                                                               --listenerId <value>                                           The special listenerId                                                                                                                 -p, --path <value>                                                 path tracing pattern                                                                                                                   -E, --regex                                                        Enable regular expression to match (wildcard matching by default)                                                                          --skipJDKMethod <value>                                        skip jdk method trace, default value true.                                                                                             -v, --verbose                                                      Enables print verbose information, default value false.                                                                                <class-pattern>                                                    Class name pattern, use either '.' or '/' as separator                                                                                 <method-pattern>                                                   Method name pattern                                                                                                                    <condition-express>                                                Conditional expression in ognl style, for example:                                                                                                                                                          TRUE  : 1==1                                                                                                                                                                                              TRUE  : true                                                                                                                                                                                              FALSE : false                                                                                                                                                                                             TRUE  : 'params.length>=0'                                                                                                                                                                                FALSE : 1==2                                                                                                                                                                                              '#cost>100'
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使用:

--exclude-class-pattern <value> 想要排除的类                                                -n, --limits <value> 观察几次--listenerId <value> 指定的 listenerId-p, --path <value> 这个没看懂啥作用-E, --regex 正则表达式--skipJDKMethod <value> 是否跳过 jdk 的方法, 默认是 true-v, --verbose 是否多输出一些信息, 默认是 false<class-pattern> 类名<method-pattern> 方法名<condition-express> ognl 表达式
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**这个方法主要用于查看方法的耗时, 主要有两点常见的使用办法: **

比如查看耗时在 1 s 以上的方法:

[arthas@63687]$ trace com.codog.demo.Main wuyifantime '#cost > 1000'Press Q or Ctrl+C to abort.Affect(class count: 1 , method count: 1) cost in 26 ms, listenerId: 2`---ts=2021-07-24 22:37:54;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=jdk.internal.loader.ClassLoaders$AppClassLoader@3d4eac69    `---[406.151996ms] com.codog.demo.Main:changeobject() #29
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这个方式只能计算一层的耗时, 想看到下面几层的耗时:

➜  demotemp telnet localhost 3658Trying 127.0.0.1...Connected to localhost.Escape character is '^]'.  ,---.  ,------. ,--------.,--.  ,--.  ,---.   ,---.                            /  O  \ |  .--. ''--.  .--'|  '--'  | /  O  \ '   .-'                          |  .-.  ||  '--'.'   |  |   |  .--.  ||  .-.  |`.  `-.                          |  | |  ||  |\  \    |  |   |  |  |  ||  | |  |.-'    |                         `--' `--'`--' '--'   `--'   `--'  `--'`--' `--'`-----'                          wiki       https://arthas.aliyun.com/doc                                        tutorials  https://arthas.aliyun.com/doc/arthas-tutorials.html                  version    3.5.2                                                                main_class com.codog.demo.Main                                                  pid        63687                                                                time       2021-07-24 22:11:33                                                  [arthas@63687]$ [arthas@63687]$ [arthas@63687]$ [arthas@63687]$ trace com.codog.demo.Main changeobject --listenerId 1Press Q or Ctrl+C to abort.Affect(class count: 1 , method count: 1) cost in 21 ms, listenerId: 1
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[arthas@63687]$ trace com.codog.demo.Main wuyifantimePress Q or Ctrl+C to abort.Affect(class count: 1 , method count: 1) cost in 113 ms, listenerId: 1`---ts=2021-07-24 22:12:14;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=jdk.internal.loader.ClassLoaders$AppClassLoader@3d4eac69    `---[405.964495ms] com.codog.demo.Main:wuyifantime()        `---[405.313685ms] com.codog.demo.Main:changeobject() #29`---ts=2021-07-24 22:12:15;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=jdk.internal.loader.ClassLoaders$AppClassLoader@3d4eac69    `---[120406.120851ms] com.codog.demo.Main:wuyifantime()        `---[405.479587ms] com.codog.demo.Main:changeobject() #29`---ts=2021-07-24 22:14:15;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=jdk.internal.loader.ClassLoaders$AppClassLoader@3d4eac69    `---[120407.586592ms] com.codog.demo.Main:wuyifantime()        `---[405.349313ms] com.codog.demo.Main:changeobject() #29`---ts=2021-07-24 22:23:50;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=jdk.internal.loader.ClassLoaders$AppClassLoader@3d4eac69    `---[60407.737325ms] com.codog.demo.Main:wuyifantime()        `---[402.376084ms] com.codog.demo.Main:changeobject() #29            `---[402.127891ms] com.codog.demo.Main:changeobject()                `---[200.970532ms] com.codog.demo.Main:testgt18() #39`---ts=2021-07-24 22:24:50;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=jdk.internal.loader.ClassLoaders$AppClassLoader@3d4eac69    `---[60406.014846ms] com.codog.demo.Main:wuyifantime()        `---[401.328146ms] com.codog.demo.Main:changeobject() #29            `---[401.128872ms] com.codog.demo.Main:changeobject()                `---[200.614497ms] com.codog.demo.Main:testgt18() #39
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