Java项目服务器cpu占用100%解决办法-白红宇

Java项目服务器cpu占用100%解决办法

阅读量：5753 次

发布时间：2019-06-18

本文共 5070 字，大约阅读时间需要 16 分钟。

项目上线后运行一段时间，突然发现cpu 8个逻辑核心都占用100%，心情很紧张，然后就在网上找了一些解决方法，具体如下：

1.查找哪些进程在耗cpu

进入服务器，top 命令看一下，发现进程6633占用了800%

[root@server ~]# top

2.把进程的栈dump到文件里，以便后面的分析

[root@server ~]# jstack 23812 >> java.txt

3.看看这个进程里面哪些线程在占用cpu

[root@server ~]# top -p 23812 -H

一大片占用cpu很高的线程，选一个最高的吧，PID=15362

4.接着要看刚才dump出来的java.txt日志了，里面会有23812这个进程下面每个线程的栈信息，但是是十六进制显示的，所以先把5159转换成16进制

[root@server ~]# printf %0x 15362

[root@server ~]# 3c02

5.在cpu日志里找PID=3c02的线程

[root@server ~]# vi java.txt

6.分析原因

[root@localhost ~]# grep "3c02" java.txt

"JS executor for com.gargoylesoftware.htmlunit.WebClient@4e96f35e" #76858 daemon prio=5 os_prio=0 tid=0x00007f390000b800 nid=0x3c02 runnable [0x00007f3ae13db000]

"JS executor for com.gargoylesoftware.htmlunit.WebClient@4e96f35e" #76858 daemon prio=5 os_prio=0 tid=0x00007f390000b800 nid=0x3c02 runnab

java.lang.Thread.State: RUNNABLE

at java.util.ArrayList.<init>(ArrayList.java:177)

at com.gargoylesoftware.htmlunit.html.HtmlPage.safeGetAttributeListeners(HtmlPage.java:2222)

- locked <0x00000005cd622798> (a java.lang.String)

at com.gargoylesoftware.htmlunit.html.HtmlPage.fireHtmlAttributeReplaced(HtmlPage.java:2198)

at com.gargoylesoftware.htmlunit.html.HtmlElement.setAttributeNS(HtmlElement.java:213)

at com.gargoylesoftware.htmlunit.html.DomElement.setAttribute(DomElement.java:296)

at com.gargoylesoftware.htmlunit.javascript.host.css.CSSStyleDeclaration.writeToElement(CSSStyleDeclaration.java:652)

at com.gargoylesoftware.htmlunit.javascript.host.css.CSSStyleDeclaration.replaceStyleAttribute(CSSStyleDeclaration.java:576)

at com.gargoylesoftware.htmlunit.javascript.host.css.CSSStyleDeclaration.setStyleAttribute(CSSStyleDeclaration.java:550)

at com.gargoylesoftware.htmlunit.javascript.host.css.CSSStyleDeclaration.setZIndex(CSSStyleDeclaration.java:3956)

at sun.reflect.GeneratedMethodAccessor135.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:120)

at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject$GetterSlot.setValue(ScriptableObject.java:295)

at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject$RelinkedSlot.setValue(ScriptableObject.java:368)

at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.putImpl(ScriptableObject.java:2796)

at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.put(ScriptableObject.java:521)

at com.gargoylesoftware.htmlunit.javascript.host.css.CSSStyleDeclaration.put(CSSStyleDeclaration.java:2407)

at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.putProperty(ScriptableObject.java:2479)

at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1574)

at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1569)

at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1253)

at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)

at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)

at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:411)

at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309)

at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3057)

at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)

at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:566)

at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:674)

- locked <0x00000005cd2f5a08> (a com.gargoylesoftware.htmlunit.html.HtmlPage)

at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:620)

at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)

at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:575)

at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:550)

at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:971)

at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptStringJob.runJavaScript(JavaScriptStringJob.java:50)

at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptExecutionJob.run(JavaScriptExecutionJob.java:102)

at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptJobManagerImpl.runSingleJob(JavaScriptJobManagerImpl.java:328)

at com.gargoylesoftware.htmlunit.javascript.background.DefaultJavaScriptExecutor.run(DefaultJavaScriptExecutor.java:162)

at java.lang.Thread.run(Thread.java:745)

找到问题所在让java开发排查

转载于:https://blog.51cto.com/wujianwei/1964359

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