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(); }}
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'
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
**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$AppClassLoader@3d4eac69 `---[406.151996ms] com.codog.demo.Main:changeobject() #29
这个方式只能计算一层的耗时, 想看到下面几层的耗时:
➜ demotemp telnet localhost 3658Trying 127.0.0.1...Connected to localhost.Escape character is '^]'. ,---. ,------. ,--------.,--. ,--. ,---. ,---. / O \ | .--. ''--. .--'| '--' | / O \ ' .-' | .-. || '--'.' | | | .--. || .-. |`. `-. | | | || |\ \ | | | | | || | | |.-' | `--' `--'`--' '--' `--' `--' `--'`--' `--'`-----' wiki https://arthas.aliyun.com/doc tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html version 3.5.2 main_class com.codog.demo.Main pid 63687 time 2021-07-24 22:11:33 [arthas@63687]$ [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
[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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