{"id":1382,"date":"2017-03-30T14:40:12","date_gmt":"2017-03-30T06:40:12","guid":{"rendered":"https:\/\/www.strongd.net\/?p=1382"},"modified":"2017-03-30T14:40:12","modified_gmt":"2017-03-30T06:40:12","slug":"%e5%88%86%e6%9e%90java%e8%bf%9b%e7%a8%8b%e5%81%87%e6%ad%bb%e6%83%85%e5%86%b5","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=1382","title":{"rendered":"\u5206\u6790java\u8fdb\u7a0b\u5047\u6b7b\u60c5\u51b5"},"content":{"rendered":"

1 \u5f15\u8a00<\/h1>\n

 <\/p>\n

1.1 \u7f16\u5199\u76ee\u7684<\/h2>\n

 <\/p>\n

\u4e3a\u4e86\u65b9\u4fbf\u5927\u5bb6\u4ee5\u540e\u53d1\u73b0\u8fdb\u7a0b\u5047\u6b7b\u7684\u65f6\u5019\u80fd\u591f\u6b63\u5e38\u7684\u5206\u6790\u5e76\u4e14\u7b2c\u4e00\u65f6\u95f4\u4fdd\u7559\u73b0\u573a\u5feb\u7167\u3002<\/p>\n

 <\/p>\n

1.2\u7f16\u5199\u80cc\u666f<\/h2>\n

 <\/p>\n

\u6700\u8fd1\u670d\u52a1\u5668\u53d1\u73b0tomcat\u7684\u5e94\u7528\u4f1a\u5076\u5c14\u51fa\u73b0\u65e0\u6cd5\u8bbf\u95ee\u7684\u60c5\u51b5\u3002\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u7684\u89c2\u5bdf\u6700\u8fd1\u53c8\u53d1\u73b0\u6709\u53f0tomcat\u7684\u5e94\u7528\u51fa\u73b0\u4e86\u65e0\u6cd5\u8bbf\u95ee\u60c5\u51b5\u3002\u7b80\u5355\u63cf\u8ff0\u4e0b\u8be5\u53f0tomcat\u5f53\u65f6\u5177\u4f53\u7684\u8868\u73b0\uff1a\u5ba2\u6237\u7aef\u8bf7\u6c42\u6ca1\u6709\u54cd\u5e94\uff0c\u67e5\u770b\u670d\u52a1\u5668\u7aeftomcat\u7684\u8fdb\u7a0b\u662f\u5b58\u6d3b\u7684\uff0c\u67e5\u770b\u4e1a\u52a1\u65e5\u5fd7\u7684\u65f6\u5019\u53d1\u73b0\u65e5\u5fd7\u505c\u6b62\u6ca1\u6709\u4efb\u4f55\u6700\u65b0\u7684\u8bbf\u95ee\u65e5\u5fd7\u3002\u8fdetomcat\u4e0b\u9762\u7684catalina.log\u4e5f\u6ca1\u6709\u4efb\u4f55\u8bbf\u95ee\u8bb0\u5f55\uff0c\u57fa\u672c\u65ad\u5b9a\u8be5\u53f0tomcat\u5df2\u4e0d\u80fd\u63d0\u4f9b\u670d\u52a1\u3002<\/p>\n

 <\/p>\n

2 \u5206\u6790\u6b65\u9aa4<\/h1>\n

 <\/p>\n

\u6839\u636e\u524d\u9762\u6211\u63cf\u8ff0\u7684\u5047\u6b7b\u73b0\u8c61\uff0c\u6211\u6700\u5148\u60f3\u5230\u7684\u662f\u7f51\u7edc\u662f\u5426\u51fa\u73b0\u4e86\u95ee\u9898\uff0c\u662f\u4e0d\u662f\u6709\u4ec0\u4e48\u4e22\u5305\u4e25\u91cd\u7684\u60c5\u51b5\uff0c\u4e8e\u662f\u6211\u5f00\u59cb\u4ece\u8bf7\u6c42\u7684\u6570\u636e\u6d41\u7a0b\u5f00\u59cb\u5206\u6790\uff0c\u7531\u4e8e\u6211\u4eec\u4e1a\u52a1\u7684\u67b6\u6784\u91c7\u7528\u7684\u662fnginx+tomcat\u7684\u96c6\u7fa4\u914d\u7f6e\uff0c\u4e00\u4e2a\u8bf7\u6c42\u4e0a\u6765\u7684\u6d41\u5411\u53ef\u4ee5\u7528\u4e0b\u56fe\u6765\u7b80\u5355\u7684\u63cf\u8ff0\u4e00\u4e0b\uff1a<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

2.1\u68c0\u67e5nginx\u7684\u7f51\u7edc\u60c5\u51b5<\/h2>\n

 <\/p>\n

\u66f4\u6539nginx\u7684\u914d\u7f6e\uff0c\u8ba9\u8be5\u53f0nginx\u8bf7\u6c42\u53ea\u8f6c\u5230\u672c\u673a\u5668\u7684\u51fa\u73b0\u95ee\u9898\u7684tomcat\u5e94\u7528\u4e0a\u9762\uff0c\u5728access.log\u91cc\u770b\u662f\u5426\u6709\u7f51\u7edc\u8bf7\u6c42\uff0c\u7ed3\u679c\u53ef\u4ee5\u67e5\u770b\u5230\u5f53\u524d\u6240\u6709\u7684\u7f51\u7edc\u8bf7\u6c42\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ef\u4ee5\u6392\u9664\u662f\u7f51\u7edc\u7684\u95ee\u9898\u3002<\/p>\n

 <\/p>\n

2.2\u68c0\u67e5tomcat \u7684\u7f51\u7edc\u60c5\u51b5<\/h2>\n

 <\/p>\n

\u5206\u6790\u4e1a\u52a1\u914d\u7f6e\u7684tomcat\u8bbf\u95ee\u65e5\u5fd7xxxx.log\u4e0a\u662f\u5426\u6709\u65e5\u5fd7\u8bbf\u95ee\u8bb0\u5f55\uff0c\u7ecf\u8fc7\u67e5\u8be2\u8be5\u53f0tomcat\u5e94\u7528\u65e5\u5fd7\u5b8c\u5168\u6ca1\u6709\u4efb\u4f55\u8bbf\u95ee\u8bb0\u5f55\uff0c\u7531\u4e8e\u6211\u4eec\u7684\u90e8\u7f72\u662f\u672c\u673a\u7684nginx\u8f6c\u5230\u672c\u673a\u7684tomcat\u5e94\u7528\uff0c\u6240\u4ee5\u53ef\u4ee5\u6392\u9664\u4e0d\u662f\u7f51\u7edc\u95ee\u9898\u3002\u5230\u6b64\u57fa\u672c\u53ef\u4ee5\u65ad\u5b9a\u7f51\u7edc\u6ca1\u6709\u95ee\u9898\uff0ctomcat \u672c\u8eab\u51fa\u73b0\u4e86\u5047\u6b7b\u7684\u60c5\u51b5\u3002\u5728tomcat\u7684\u65e5\u5fd7\u91cc\u6709\u62a5\u8fc7OutOfMemoryError\u7684\u5f02\u5e38\uff0c\u6240\u4ee5\u53ef\u4ee5\u80af\u5b9atomcat\u5047\u6b7b\u7684\u539f\u56e0\u662fOOM<\/p>\n

 <\/p>\n

3 \u5206\u6790JVM\u5185\u5b58\u6ea2\u51fa<\/h1>\n

 <\/p>\n

3.1\u4e3a\u4ec0\u4e48\u4f1a\u53d1\u751f\u5185\u5b58\u6cc4\u6f0f<\/h2>\n

 <\/p>\n

\u5728\u6211\u4eec\u5b66\u4e60Java\u7684\u65f6\u5019\u5c31\u77e5\u9053\u5b83\u6700\u4e3a\u65b9\u4fbf\u7684\u5730\u65b9\u5c31\u662f\u6211\u4eec\u4e0d\u9700\u8981\u7ba1\u7406\u5185\u5b58\u7684\u5206\u914d\u548c\u91ca\u653e\uff0c\u4e00\u5207\u7531JVM\u81ea\u5df1\u6765\u8fdb\u884c\u5904\u7406\uff0c\u5f53Java\u5bf9\u8c61\u4e0d\u518d\u88ab\u5e94\u7528\u65f6\uff0c\u7b49\u5230\u5806\u5185\u5b58\u4e0d\u591f\u7528\u65f6JVM\u4f1a\u8fdb\u884cGC\u5904\u7406\uff0c\u6e05\u9664\u8fd9\u4e9b\u5bf9\u8c61\u5360\u7528\u7684\u5806\u5185\u5b58\u7a7a\u95f4\uff0c\u4f46\u662f\u5982\u679c\u5bf9\u8c61\u4e00\u76f4\u88ab\u5e94\u7528\uff0c\u90a3\u4e48JVM\u662f\u65e0\u6cd5\u5bf9\u5176\u8fdb\u884cGC\u5904\u7406\u7684\uff0c\u90a3\u4e48\u6211\u4eec\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\u65f6\uff0cJVM\u5c31\u6ca1\u6709\u529e\u6cd5\u4ece\u5806\u4e2d\u83b7\u53d6\u8db3\u591f\u7684\u5185\u5b58\u5206\u914d\u7ed9\u6b64\u5bf9\u8c61\uff0c\u8fd9\u65f6\u5c31\u4f1a\u5bfc\u81f4OOM\u3002\u6211\u4eec\u51fa\u73b0OOM\u539f\u56e0\uff0c\u4e00\u822c\u90fd\u662f\u56e0\u4e3a\u6211\u4eec\u4e0d\u65ad\u7684\u5f80\u5bb9\u5668\u91cc\u5b58\u653e\u5bf9\u8c61\uff0c\u7136\u800c\u5bb9\u5668\u6ca1\u6709\u76f8\u5e94\u7684\u5927\u5c0f\u9650\u5236\u6216\u6e05\u9664\u673a\u5236\uff0c\u8fd9\u6837\u5c31\u5bb9\u6613\u5bfc\u81f4OOM\u3002<\/p>\n

 <\/p>\n

3.2\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898<\/h2>\n

 <\/p>\n

\u5f53\u6211\u4eec\u7684\u5e94\u7528\u670d\u52a1\u5668\u5360\u7528\u4e86\u8fc7\u591a\u5185\u5b58\u7684\u65f6\u5019\uff0c\u6211\u4eec\u600e\u4e48\u6837\u624d\u80fd\u5feb\u901f\u7684\u5b9a\u4f4d\u95ee\u9898\u5462\uff1f\u8981\u60f3\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898\uff0c\u9996\u5148\u6211\u4eec\u5fc5\u9700\u83b7\u53d6\u670d\u52a1\u5668JVM\u67d0\u65f6\u523b\u7684\u5185\u5b58\u5feb\u7167\u3002Jdk\u91cc\u9762\u63d0\u4f9b\u4e86\u5f88\u591a\u76f8\u5e94\u7684\u547d\u4ee4\u6bd4\u5982\uff1ajstack,jstat,jmap,jps\u7b49\u7b49. \u5728\u51fa\u73b0\u95ee\u9898\u540e\u6211\u4eec\u5e94\u8be5\u5feb\u901f\u4fdd\u7559\u73b0\u573a\u3002<\/p>\n

 <\/p>\n

3.2.1 jstack<\/p>\n

 <\/p>\n

\u53ef\u4ee5\u89c2\u5bdf\u5230jvm\u4e2d\u5f53\u524d\u6240\u6709\u7ebf\u7a0b\u7684\u8fd0\u884c\u60c5\u51b5\u548c\u7ebf\u7a0b\u5f53\u524d\u72b6\u6001.<\/p>\n

 <\/p>\n

sudo jstack -F \u8fdb\u7a0bID
\n\u8f93\u51fa\u5185\u5bb9\u5982\u4e0b\uff1a
\n\"\"<\/p>\n

\u4ece\u4e0a\u9762\u7684\u56fe\u6211\u4eec\u53ef\u4ee5\u770b\u5230tomcat\u8fdb\u7a0b\u91cc\u9762\u6ca1\u6709\u6b7b\u9501\u7684\u60c5\u51b5\uff0c\u800c\u4e14\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u5904\u7406\u7b49\u5f85\u7684\u72b6\u6001\u3002\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u53ef\u4ee5telnet\u547d\u4ee4\u8fde\u4e0atomcat\u7684\u7aef\u53e3\u67e5\u770btomcat\u8fdb\u7a0b\u662f\u5426\u6709\u4efb\u52a1\u56de\u5e94\u3002\u8fd9\u65f6\u53d1\u73b0tomcat\u6ca1\u6709\u4efb\u4f55\u56de\u5e94\u53ef\u4ee5\u8bc1\u660etomcat\u5e94\u7528\u5df2\u6ca1\u6709\u54cd\u5e94\u5904\u7406\u5047\u6b7b\u72b6\u6001\u3002<\/p>\n

 <\/p>\n

3.2.2 jstat<\/p>\n

\u8fd9\u662fjdk\u547d\u4ee4\u4e2d\u6bd4\u8f83\u91cd\u8981\uff0c\u4e5f\u662f\u76f8\u5f53\u5b9e\u7528\u7684\u4e00\u4e2a\u547d\u4ee4\uff0c\u53ef\u4ee5\u89c2\u5bdf\u5230classloader\uff0ccompiler\uff0cgc\u76f8\u5173\u4fe1\u606f
\n\u5177\u4f53\u53c2\u6570\u5982\u4e0b\uff1a
\n-class\uff1a\u7edf\u8ba1class loader\u884c\u4e3a\u4fe1\u606f
\n-compile\uff1a\u7edf\u8ba1\u7f16\u8bd1\u884c\u4e3a\u4fe1\u606f
\n-gc\uff1a\u7edf\u8ba1jdk gc\u65f6heap\u4fe1\u606f
\n-gccapacity\uff1a\u7edf\u8ba1\u4e0d\u540c\u7684generations\uff08\u5305\u62ec\u65b0\u751f\u533a\uff0c\u8001\u5e74\u533a\uff0cpermanent\u533a\uff09\u76f8\u5e94\u7684heap\u5bb9\u91cf\u60c5\u51b5
\n-gccause\uff1a\u7edf\u8ba1gc\u7684\u60c5\u51b5\uff0c\uff08\u540c-gcutil\uff09\u548c\u5f15\u8d77gc\u7684\u4e8b\u4ef6
\n-gcnew\uff1a\u7edf\u8ba1gc\u65f6\uff0c\u65b0\u751f\u4ee3\u7684\u60c5\u51b5
\n-gcnewcapacity\uff1a\u7edf\u8ba1gc\u65f6\uff0c\u65b0\u751f\u4ee3heap\u5bb9\u91cf
\n-gcold\uff1a\u7edf\u8ba1gc\u65f6\uff0c\u8001\u5e74\u533a\u7684\u60c5\u51b5
\n-gcoldcapacity\uff1a\u7edf\u8ba1gc\u65f6\uff0c\u8001\u5e74\u533aheap\u5bb9\u91cf
\n-gcpermcapacity\uff1a\u7edf\u8ba1gc\u65f6\uff0cpermanent\u533aheap\u5bb9\u91cf
\n-gcutil\uff1a\u7edf\u8ba1gc\u65f6\uff0cheap\u60c5\u51b5
\n-printcompilation\uff1a\u4e0d\u77e5\u9053\u5e72\u4ec0\u4e48\u7684\uff0c\u4e00\u76f4\u6ca1\u7528\u8fc7\u3002<\/p>\n

\u4e00\u822c\u6bd4\u8f83\u5e38\u7528\u7684\u51e0\u4e2a\u53c2\u6570\u662f\uff1a
\nsudo jstat -class 2083 1000 10 \uff08\u6bcf\u96941\u79d2\u76d1\u63a7\u4e00\u6b21\uff0c\u4e00\u5171\u505a10\u6b21\uff09<\/p>\n

 <\/p>\n

\u67e5\u770b\u5f53\u65f6\u7684head\u60c5\u51b5<\/p>\n

 <\/p>\n

sudo jstat -gcutil\u00a0 20683 2000
\n\"\"
\n\u6ce8\uff1a\u8be5\u56fe\u4e0d\u662f\u51fa\u9519\u622a\u53d6<\/p>\n

 <\/p>\n

\u51fa\u73b0\u65f6\u5019\u622a\u53d6\u7684\u6570\u636e\u662fgc\u5df2\u7ecf\u5b8c\u5168\u6ca1\u6709\u5904\u7406\u4e86,\u56e0\u4e3a\u6ca1\u6709\u52a0\u4e0afull gc\u7684\u65e5\u5fd7\u6240\u4ee5\u4e0d\u786e\u5b9aJVM GC \u65f6\u95f4\u8fc7\u957f\uff0c\u5bfc\u81f4\u5e94\u7528\u6682\u505c.<\/p>\n

 <\/p>\n

3.2.3\u83b7\u53d6\u5185\u5b58\u5feb\u7167<\/p>\n

 <\/p>\n

Jdk\u81ea\u5e26\u7684jmap\u53ef\u4ee5\u83b7\u53d6\u5185\u5728\u67d0\u4e00\u65f6\u523b\u7684\u5feb\u7167<\/p>\n

 <\/p>\n

\u547d\u4ee4\uff1ajmap -dump:format=b,file=heap.bin <pid>
\nfile\uff1a\u4fdd\u5b58\u8def\u5f84\u53ca\u6587\u4ef6\u540d
\npid\uff1a\u8fdb\u7a0b\u7f16\u53f7\uff08windows\u901a\u8fc7\u4efb\u52a1\u7ba1\u7406\u5668\u67e5\u770b\uff0clinux\u901a\u8fc7ps aux\u67e5\u770b\uff09
\ndump\u6587\u4ef6\u53ef\u4ee5\u901a\u8fc7MemoryAnalyzer\u5206\u6790\u67e5\u770b\uff0c\u7f51\u5740\uff1ahttp:\/\/www.eclipse.org\/mat\/\uff0c\u53ef\u4ee5\u67e5\u770bdump\u65f6\u5bf9\u8c61\u6570\u91cf\uff0c\u5185\u5b58\u5360\u7528\uff0c\u7ebf\u7a0b\u60c5\u51b5\u7b49\u3002
\n\"\"
\n\u4ece\u4e0a\u9762\u7684\u56fe\u53ef\u4ee5\u770b\u5f97\u51fa\u6765\u5bf9\u8c61\u6ca1\u6709\u5185\u5b58\u6ea2\u51fa\u3002
\n\"\"<\/p>\n

\u4ece\u4e0a\u56fe\u6211\u4eec\u53ef\u4ee5\u660e\u786e\u7684\u770b\u51fa\u6b64\u9879\u76ee\u7684HashMap\u5185\u5b58\u4f7f\u7528\u7387\u6bd4\u8f83\u9ad8\uff0c\u56e0\u4e3a\u6211\u4eec\u7684\u7cfb\u7edf\u90fd\u662f\u8fd4\u56deMap\u7684\u6570\u636e\u7ed3\u6784\u6240\u4ee5\u5360\u7528\u6bd4\u8f83\u9ad8\u7684\u5185\u5b58\u662f\u6b63\u5e38\u60c5\u51b5\u3002<\/p>\n

 <\/p>\n

 <\/p>\n

3.2.4\u89c2\u5bdf\u8fd0\u884c\u4e2d\u7684jvm\u7269\u7406\u5185\u5b58\u7684\u5360\u7528\u60c5\u51b5<\/p>\n

 <\/p>\n

\u89c2\u5bdf\u8fd0\u884c\u4e2d\u7684jvm\u7269\u7406\u5185\u5b58\u7684\u5360\u7528\u60c5\u51b5\u3002\u6211\u4eec\u4e5f\u53ef\u4ee5\u7528jmap\u547d\u4ee4
\n\u53c2\u6570\u5982\u4e0b\uff1a
\n-heap\uff1a\u6253\u5370jvm heap\u7684\u60c5\u51b5
\n-histo\uff1a\u6253\u5370jvm heap\u7684\u76f4\u65b9\u56fe\u3002\u5176\u8f93\u51fa\u4fe1\u606f\u5305\u62ec\u7c7b\u540d\uff0c\u5bf9\u8c61\u6570\u91cf\uff0c\u5bf9\u8c61\u5360\u7528\u5927\u5c0f\u3002
\n-histo\uff1alive \uff1a\u540c\u4e0a\uff0c\u4f46\u662f\u53ea\u7b54\u5e94\u5b58\u6d3b\u5bf9\u8c61\u7684\u60c5\u51b5
\n-permstat\uff1a\u6253\u5370permanent generation heap\u60c5\u51b5<\/p>\n

\u547d\u4ee4\u4f7f\u7528\uff1a
\njmap -heap 2083
\n\u53ef\u4ee5\u89c2\u5bdf\u5230New Generation\uff08Eden Space\uff0cFrom Space\uff0cTo Space\uff09,tenured generation,Perm Generation\u7684\u5185\u5b58\u4f7f\u7528\u60c5\u51b5
\n\u8f93\u51fa\u5185\u5bb9\uff1a
\n\"\"
\n\u4e0a\u56fe\u4e3atomcat\u5e94\u7528\u51fa\u9519\u524dJVM\u7684\u914d\u7f6e\u4fe1\u606f,\u53ef\u4ee5\u660e\u786e\u7684\u770b\u5230\u5f53\u65f6\u7684\u4fe1\u606f:<\/p>\n

 <\/p>\n

MaxHeapSize\u5806\u5185\u5b58\u5927\u5c0f\u4e3a\uff1a3500M<\/p>\n

 <\/p>\n

MaxNewSize\u65b0\u751f\u4ee3\u5185\u5b58\u5927\u5c0f\uff1a512M<\/p>\n

 <\/p>\n

PermSize\u6c38\u4e45\u4ee3\u5185\u5b58\u5927\u5c0f:192M<\/p>\n

 <\/p>\n

NewRatio\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\uff08\u5305\u62ecEden\u548c\u4e24\u4e2aSurvivor\u533a\uff09\u4e0e\u5e74\u8001\u4ee3\u7684\u6bd4\u503c\uff08\u9664\u53bb\u6301\u4e45\u4ee3\uff09\u3002\u8bbe\u7f6e\u4e3a2\uff0c\u5219\u5e74\u8f7b\u4ee3\u4e0e\u5e74\u8001\u4ee3\u6240\u5360\u6bd4\u503c\u4e3a1\uff1a2\uff0c\u5e74\u8f7b\u4ee3\u5360\u6574\u4e2a\u5806\u6808\u76841\/3<\/p>\n

 <\/p>\n

SurvivorRatio\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u4e2dEden\u533a\u4e0eSurvivor\u533a\u7684\u5927\u5c0f\u6bd4\u503c\u3002\u8bbe\u7f6e\u4e3a8\uff0c\u5219\u4e24\u4e2aSurvivor\u533a\u4e0e\u4e00\u4e2aEden\u533a\u7684\u6bd4\u503c\u4e3a2:8\uff0c\u4e00\u4e2aSurvivor\u533a\u5360\u6574\u4e2a\u5e74\u8f7b\u4ee3\u76841\/10<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

\u5728New Generation\u4e2d\uff0c\u6709\u4e00\u4e2a\u53ebEden\u7684\u7a7a\u95f4\uff0c\u4e3b\u8981\u662f\u7528\u6765\u5b58\u653e\u65b0\u751f\u7684\u5bf9\u8c61\uff0c\u8fd8\u6709\u4e24\u4e2aSurvivor Spaces\uff08from,to\uff09, \u5b83\u4eec\u7528\u6765\u5b58\u653e\u6bcf\u6b21\u5783\u573e\u56de\u6536\u540e\u5b58\u6d3b\u4e0b\u6765\u7684\u5bf9\u8c61\u3002\u5728Old Generation\u4e2d\uff0c\u4e3b\u8981\u5b58\u653e\u5e94\u7528\u7a0b\u5e8f\u4e2d\u751f\u547d\u5468\u671f\u957f\u7684\u5185\u5b58\u5bf9\u8c61\uff0c\u8fd8\u6709\u4e2aPermanent Generation\uff0c\u4e3b\u8981\u7528\u6765\u653eJVM\u81ea\u5df1\u7684\u53cd\u5c04\u5bf9\u8c61\uff0c\u6bd4\u5982\u7c7b\u5bf9\u8c61\u548c\u65b9\u6cd5\u5bf9\u8c61\u7b49\u3002<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

\u4ece\u4e0a\u9762\u7684\u56fe\u53ef\u4ee5\u770b\u51fa\u6765JVM\u7684\u65b0\u751f\u4ee3\u8bbe\u7f6e\u592a\u5c0f\uff0c\u53ef\u4ee5\u770b\u51fa\u5e94\u7528\u7684\u65b0\u751f\u4ee3\u533a\u5b8c\u5168\u5360\u6ee1\u4e86\uff0c\u65e0\u6cd5\u518d\u5f80\u65b0\u751f\u4ee3\u533a\u589e\u52a0\u65b0\u7684\u5bf9\u8c61\u6b64\u65f6\u7684\u8fd9\u4e9b\u5bf9\u8c61\u90fd\u5904\u4e8e\u6d3b\u8dc3\u72b6\u6001\uff0c\u6240\u4ee5\u4e0d\u4f1a\u88abGC\u5904\u7406\uff0c\u4f46\u662ftomcat\u5e94\u7528\u8fd8\u5728\u7ee7\u7eed\u4ea7\u751f\u65b0\u7684\u5bf9\u8c61\uff0c\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4OOM\u7684\u53d1\u751f\uff0c\u8fd9\u5c31\u662f\u5bfc\u81f4tomcat\u5047\u6b7b\u7684\u539f\u56e0.<\/p>\n

 <\/p>\n

4 Tomcat\u5047\u6b7b\u5176\u5b83\u60c5\u51b5<\/h1>\n

 <\/p>\n

\u4ee5\u4e0b\u662f\u7f51\u4e0a\u8d44\u6599\u8bf4\u7684tomcat\u5047\u7684\u60c5\u51b5\uff1a<\/p>\n

 <\/p>\n

1\u3001\u5e94\u7528\u672c\u8eab\u7a0b\u5e8f\u7684\u95ee\u9898\uff0c\u9020\u6210\u6b7b\u9501\u3002<\/p>\n

 <\/p>\n

2\u3001load \u592a\u9ad8\uff0c\u5df2\u7ecf\u8d85\u51fa\u670d\u52a1\u7684\u6781\u9650<\/p>\n

 <\/p>\n

3\u3001jvm GC \u65f6\u95f4\u8fc7\u957f\uff0c\u5bfc\u81f4\u5e94\u7528\u6682\u505c<\/p>\n

 <\/p>\n

\u56e0\u4e3a\u51fa\u9519\u9879\u76ee\u91cc\u9762\u6ca1\u6709\u6253\u51faGC\u7684\u5904\u7406\u60c5\u51b5\uff0c\u6240\u4ee5\u4e0d\u786e\u5b9a\u6b64\u539f\u56e0\u662f\u5426\u4e5f\u662f\u6211\u9879\u76eetomcat\u5047\u6b7b\u7684\u539f\u56e0\u4e4b\u4e00\u3002<\/p>\n

 <\/p>\n

4\u3001\u5927\u91cftcp \u8fde\u63a5 CLOSE_WAIT<\/p>\n

 <\/p>\n

netstat -n | awk ‘\/^tcp\/ {++S[$NF]} END {for(a in S) print a, S[a]}’<\/p>\n

 <\/p>\n

TIME_WAIT 48<\/p>\n

 <\/p>\n

CLOSE_WAIT 2228<\/p>\n

 <\/p>\n

ESTABLISHED 86<\/p>\n

 <\/p>\n

\u5e38\u7528\u7684\u4e09\u4e2a\u72b6\u6001\u662f\uff1aESTABLISHED \u8868\u793a\u6b63\u5728\u901a\u4fe1\uff0cTIME_WAIT \u8868\u793a\u4e3b\u52a8\u5173\u95ed\uff0cCLOSE_WAIT \u8868\u793a\u88ab\u52a8\u5173<\/p>\n","protected":false},"excerpt":{"rendered":"

1 \u5f15\u8a00   1.1 \u7f16\u5199\u76ee\u7684   \u4e3a\u4e86\u65b9\u4fbf\u5927\u5bb6\u4ee5\u540e\u53d1\u73b0\u8fdb\u7a0b\u5047\u6b7b\u7684\u65f6\u5019\u80fd\u591f\u6b63\u5e38\u7684\u5206\u6790\u5e76\u4e14\u7b2c\u4e00\u65f6\u95f4\u4fdd\u7559\u73b0\u573a\u5feb\u7167\u3002   1.2\u7f16\u5199\u80cc\u666f   \u6700\u8fd1\u670d\u52a1\u5668\u53d1\u73b0tomcat\u7684\u5e94\u7528\u4f1a\u5076\u5c14\u51fa\u73b0\u65e0\u6cd5\u8bbf\u95ee\u7684\u60c5\u51b5\u3002\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u7684\u89c2\u5bdf\u6700\u8fd1\u53c8\u53d1\u73b0\u6709\u53f0tomcat\u7684\u5e94\u7528\u51fa\u73b0\u4e86\u65e0\u6cd5\u8bbf\u95ee\u60c5\u51b5\u3002\u7b80\u5355\u63cf\u8ff0\u4e0b\u8be5\u53f0tomcat\u5f53\u65f6\u5177\u4f53\u7684\u8868\u73b0\uff1a\u5ba2\u6237\u7aef\u8bf7\u6c42\u6ca1\u6709\u54cd\u5e94\uff0c\u67e5\u770b\u670d\u52a1\u5668\u7aeftomcat\u7684\u8fdb\u7a0b\u662f\u5b58\u6d3b\u7684\uff0c\u67e5\u770b\u4e1a\u52a1\u65e5\u5fd7\u7684\u65f6\u5019\u53d1\u73b0\u65e5\u5fd7\u505c\u6b62\u6ca1\u6709\u4efb\u4f55\u6700\u65b0\u7684\u8bbf\u95ee\u65e5\u5fd7\u3002\u8fdetomcat\u4e0b\u9762\u7684catalina.log\u4e5f\u6ca1\u6709\u4efb\u4f55\u8bbf\u95ee\u8bb0\u5f55\uff0c\u57fa\u672c\u65ad\u5b9a\u8be5\u53f0tomcat\u5df2\u4e0d\u80fd\u63d0\u4f9b\u670d\u52a1\u3002   2 \u5206\u6790\u6b65\u9aa4   \u6839\u636e\u524d\u9762\u6211\u63cf\u8ff0\u7684\u5047\u6b7b\u73b0\u8c61\uff0c\u6211\u6700\u5148\u60f3\u5230\u7684\u662f\u7f51\u7edc\u662f\u5426\u51fa\u73b0\u4e86\u95ee\u9898\uff0c\u662f\u4e0d\u662f\u6709\u4ec0\u4e48\u4e22\u5305\u4e25\u91cd\u7684\u60c5\u51b5\uff0c\u4e8e\u662f\u6211\u5f00\u59cb\u4ece\u8bf7\u6c42\u7684\u6570\u636e\u6d41\u7a0b\u5f00\u59cb\u5206\u6790\uff0c\u7531\u4e8e\u6211\u4eec\u4e1a\u52a1\u7684\u67b6\u6784\u91c7\u7528\u7684\u662fnginx+tomcat\u7684\u96c6\u7fa4\u914d\u7f6e\uff0c\u4e00\u4e2a\u8bf7\u6c42\u4e0a\u6765\u7684\u6d41\u5411\u53ef\u4ee5\u7528\u4e0b\u56fe\u6765\u7b80\u5355\u7684\u63cf\u8ff0\u4e00\u4e0b\uff1a       2.1\u68c0\u67e5nginx\u7684\u7f51\u7edc\u60c5\u51b5   \u66f4\u6539nginx\u7684\u914d\u7f6e\uff0c\u8ba9\u8be5\u53f0nginx\u8bf7\u6c42\u53ea\u8f6c\u5230\u672c\u673a\u5668\u7684\u51fa\u73b0\u95ee\u9898\u7684tomcat\u5e94\u7528\u4e0a\u9762\uff0c\u5728access.log\u91cc\u770b\u662f\u5426\u6709\u7f51\u7edc\u8bf7\u6c42\uff0c\u7ed3\u679c\u53ef\u4ee5\u67e5\u770b\u5230\u5f53\u524d\u6240\u6709\u7684\u7f51\u7edc\u8bf7\u6c42\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ef\u4ee5\u6392\u9664\u662f\u7f51\u7edc\u7684\u95ee\u9898\u3002   2.2\u68c0\u67e5tomcat \u7684\u7f51\u7edc\u60c5\u51b5   \u5206\u6790\u4e1a\u52a1\u914d\u7f6e\u7684tomcat\u8bbf\u95ee\u65e5\u5fd7xxxx.log\u4e0a\u662f\u5426\u6709\u65e5\u5fd7\u8bbf\u95ee\u8bb0\u5f55\uff0c\u7ecf\u8fc7\u67e5\u8be2\u8be5\u53f0tomcat\u5e94\u7528\u65e5\u5fd7\u5b8c\u5168\u6ca1\u6709\u4efb\u4f55\u8bbf\u95ee\u8bb0\u5f55\uff0c\u7531\u4e8e\u6211\u4eec\u7684\u90e8\u7f72\u662f\u672c\u673a\u7684nginx\u8f6c\u5230\u672c\u673a\u7684tomcat\u5e94\u7528\uff0c\u6240\u4ee5\u53ef\u4ee5\u6392\u9664\u4e0d\u662f\u7f51\u7edc\u95ee\u9898\u3002\u5230\u6b64\u57fa\u672c\u53ef\u4ee5\u65ad\u5b9a\u7f51\u7edc\u6ca1\u6709\u95ee\u9898\uff0ctomcat \u672c\u8eab\u51fa\u73b0\u4e86\u5047\u6b7b\u7684\u60c5\u51b5\u3002\u5728tomcat\u7684\u65e5\u5fd7\u91cc\u6709\u62a5\u8fc7OutOfMemoryError\u7684\u5f02\u5e38\uff0c\u6240\u4ee5\u53ef\u4ee5\u80af\u5b9atomcat\u5047\u6b7b\u7684\u539f\u56e0\u662fOOM   3 \u5206\u6790JVM\u5185\u5b58\u6ea2\u51fa   3.1\u4e3a\u4ec0\u4e48\u4f1a\u53d1\u751f\u5185\u5b58\u6cc4\u6f0f   \u5728\u6211\u4eec\u5b66\u4e60Java\u7684\u65f6\u5019\u5c31\u77e5\u9053\u5b83\u6700\u4e3a\u65b9\u4fbf\u7684\u5730\u65b9\u5c31\u662f\u6211\u4eec\u4e0d\u9700\u8981\u7ba1\u7406\u5185\u5b58\u7684\u5206\u914d\u548c\u91ca\u653e\uff0c\u4e00\u5207\u7531JVM\u81ea\u5df1\u6765\u8fdb\u884c\u5904\u7406\uff0c\u5f53Java\u5bf9\u8c61\u4e0d\u518d\u88ab\u5e94\u7528\u65f6\uff0c\u7b49\u5230\u5806\u5185\u5b58\u4e0d\u591f\u7528\u65f6JVM\u4f1a\u8fdb\u884cGC\u5904\u7406\uff0c\u6e05\u9664\u8fd9\u4e9b\u5bf9\u8c61\u5360\u7528\u7684\u5806\u5185\u5b58\u7a7a\u95f4\uff0c\u4f46\u662f\u5982\u679c\u5bf9\u8c61\u4e00\u76f4\u88ab\u5e94\u7528\uff0c\u90a3\u4e48JVM\u662f\u65e0\u6cd5\u5bf9\u5176\u8fdb\u884cGC\u5904\u7406\u7684\uff0c\u90a3\u4e48\u6211\u4eec\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\u65f6\uff0cJVM\u5c31\u6ca1\u6709\u529e\u6cd5\u4ece\u5806\u4e2d\u83b7\u53d6\u8db3\u591f\u7684\u5185\u5b58\u5206\u914d\u7ed9\u6b64\u5bf9\u8c61\uff0c\u8fd9\u65f6\u5c31\u4f1a\u5bfc\u81f4OOM\u3002\u6211\u4eec\u51fa\u73b0OOM\u539f\u56e0\uff0c\u4e00\u822c\u90fd\u662f\u56e0\u4e3a\u6211\u4eec\u4e0d\u65ad\u7684\u5f80\u5bb9\u5668\u91cc\u5b58\u653e\u5bf9\u8c61\uff0c\u7136\u800c\u5bb9\u5668\u6ca1\u6709\u76f8\u5e94\u7684\u5927\u5c0f\u9650\u5236\u6216\u6e05\u9664\u673a\u5236\uff0c\u8fd9\u6837\u5c31\u5bb9\u6613\u5bfc\u81f4OOM\u3002   3.2\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898   \u5f53\u6211\u4eec\u7684\u5e94\u7528\u670d\u52a1\u5668\u5360\u7528\u4e86\u8fc7\u591a\u5185\u5b58\u7684\u65f6\u5019\uff0c\u6211\u4eec\u600e\u4e48\u6837\u624d\u80fd\u5feb\u901f\u7684\u5b9a\u4f4d\u95ee\u9898\u5462\uff1f\u8981\u60f3\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898\uff0c\u9996\u5148\u6211\u4eec\u5fc5\u9700\u83b7\u53d6\u670d\u52a1\u5668JVM\u67d0\u65f6\u523b\u7684\u5185\u5b58\u5feb\u7167\u3002Jdk\u91cc\u9762\u63d0\u4f9b\u4e86\u5f88\u591a\u76f8\u5e94\u7684\u547d\u4ee4\u6bd4\u5982\uff1ajstack,jstat,jmap,jps\u7b49\u7b49. \u5728\u51fa\u73b0\u95ee\u9898\u540e\u6211\u4eec\u5e94\u8be5\u5feb\u901f\u4fdd\u7559\u73b0\u573a\u3002   3.2.1 jstack   \u53ef\u4ee5\u89c2\u5bdf\u5230jvm\u4e2d\u5f53\u524d\u6240\u6709\u7ebf\u7a0b\u7684\u8fd0\u884c\u60c5\u51b5\u548c\u7ebf\u7a0b\u5f53\u524d\u72b6\u6001.   sudo jstack -F \u8fdb\u7a0bID \u8f93\u51fa\u5185\u5bb9\u5982\u4e0b\uff1a \u4ece\u4e0a\u9762\u7684\u56fe\u6211\u4eec\u53ef\u4ee5\u770b\u5230tomcat\u8fdb\u7a0b\u91cc\u9762\u6ca1\u6709\u6b7b\u9501\u7684\u60c5\u51b5\uff0c\u800c\u4e14\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u5904\u7406\u7b49\u5f85\u7684\u72b6\u6001\u3002\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u53ef\u4ee5telnet\u547d\u4ee4\u8fde\u4e0atomcat\u7684\u7aef\u53e3\u67e5\u770btomcat\u8fdb\u7a0b\u662f\u5426\u6709\u4efb\u52a1\u56de\u5e94\u3002\u8fd9\u65f6\u53d1\u73b0tomcat\u6ca1\u6709\u4efb\u4f55\u56de\u5e94\u53ef\u4ee5\u8bc1\u660etomcat\u5e94\u7528\u5df2\u6ca1\u6709\u54cd\u5e94\u5904\u7406\u5047\u6b7b\u72b6\u6001\u3002   3.2.2 jstat … Continue reading \u5206\u6790java\u8fdb\u7a0b\u5047\u6b7b\u60c5\u51b5<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,6,20],"tags":[9],"class_list":["post-1382","post","type-post","status-publish","format-standard","hentry","category-java","category-linux","category-20","tag-java-2"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1382","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1382"}],"version-history":[{"count":1,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1382\/revisions"}],"predecessor-version":[{"id":1383,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1382\/revisions\/1383"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}