{"id":1189,"date":"2019-04-08T10:48:31","date_gmt":"2019-04-08T02:48:31","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=1189"},"modified":"2019-04-08T10:48:31","modified_gmt":"2019-04-08T02:48:31","slug":"jvm%e6%80%a7%e8%83%bd%e8%b0%83%e4%bc%98%e7%9b%91%e6%8e%a7%e5%b7%a5%e5%85%b7jps%e3%80%81jstack%e3%80%81jmap%e3%80%81jhat%e3%80%81jstat%e3%80%81hprof%e4%bd%bf%e7%94%a8%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=1189","title":{"rendered":"JVM\u6027\u80fd\u8c03\u4f18\u76d1\u63a7\u5de5\u5177jps\u3001jstack\u3001jmap\u3001jhat\u3001jstat\u3001hprof\u4f7f\u7528\u8be6\u89e3"},"content":{"rendered":"

JVM\u6027\u80fd\u8c03\u4f18\u76d1\u63a7\u5de5\u5177jps\u3001jstack\u3001jmap\u3001jhat\u3001jstat\u3001hprof\u4f7f\u7528\u8be6\u89e3<\/h2>\n
2016-10-28<\/em>\u00a0<\/a>\u9a6c\u54e5Linux\u8fd0\u7ef4<\/div>\n
DK\u672c\u8eab\u63d0\u4f9b\u4e86\u5f88\u591a\u65b9\u4fbf\u7684JVM\u6027\u80fd\u8c03\u4f18\u76d1\u63a7\u5de5\u5177\uff0c\u9664\u4e86\u96c6\u6210\u5f0f\u7684VisualVM\u548cjConsole\u5916\uff0c\u8fd8\u6709jps\u3001jstack\u3001jmap\u3001jhat\u3001jstat\u3001hprof\u7b49\u5c0f\u5de7\u7684\u5de5\u5177\uff0c\u672c\u535a\u5ba2\u5e0c\u671b\u80fd\u8d77\u629b\u7816\u5f15\u7389\u4e4b\u7528\uff0c\u8ba9\u5927\u5bb6\u80fd\u5f00\u59cb\u5bf9JVM\u6027\u80fd\u8c03\u4f18\u7684\u5e38\u7528\u5de5\u5177\u6709\u6240\u4e86\u89e3\u3002\u73b0\u5b9e\u4f01\u4e1a\u7ea7Java\u5f00\u53d1\u4e2d\uff0c\u6709\u65f6\u5019\u6211\u4eec\u4f1a\u78b0\u5230\u4e0b\u9762\u8fd9\u4e9b\u95ee\u9898\uff1aOutOfMemoryError\uff0c\u5185\u5b58\u4e0d\u8db3\u5185\u5b58\u6cc4\u9732\u7ebf\u7a0b\u6b7b\u9501\u9501\u4e89\u7528\uff08Lock Contention\uff09Java\u8fdb\u7a0b\u6d88\u8017CPU\u8fc7\u9ad8……\u8fd9\u4e9b\u95ee\u9898\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\u53ef\u80fd\u88ab\u5f88\u591a\u4eba\u5ffd\u89c6\uff08\u6bd4\u5982\u6709\u7684\u4eba\u9047\u5230\u4e0a\u9762\u7684\u95ee\u9898\u53ea\u662f\u91cd\u542f\u670d\u52a1\u5668\u6216\u8005\u8c03\u5927\u5185\u5b58\uff0c\u800c\u4e0d\u4f1a\u6df1\u7a76\u95ee\u9898\u6839\u6e90\uff09\uff0c\u4f46\u80fd\u591f\u7406\u89e3\u5e76\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u662fJava\u7a0b\u5e8f\u5458\u8fdb\u9636\u7684\u5fc5\u5907\u8981\u6c42\u3002\u672c\u6587\u5c06\u5bf9\u4e00\u4e9b\u5e38\u7528\u7684JVM\u6027\u80fd\u8c03\u4f18\u76d1\u63a7\u5de5\u5177\u8fdb\u884c\u4ecb\u7ecd\uff0c\u5e0c\u671b\u80fd\u8d77\u629b\u7816\u5f15\u7389\u4e4b\u7528\u3002<\/p>\n

A\u3001\u00a0jps(Java Virtual Machine Process Status Tool) \u00a0 \u00a0 \u00a0<\/strong>\u00a0 \u00a0 jps\u4e3b\u8981\u7528\u6765\u8f93\u51faJVM\u4e2d\u8fd0\u884c\u7684\u8fdb\u7a0b\u72b6\u6001\u4fe1\u606f\u3002\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1ajps\u00a0[options]\u00a0[hostid]
\n\u5982\u679c\u4e0d\u6307\u5b9ahostid\u5c31\u9ed8\u8ba4\u4e3a\u5f53\u524d\u4e3b\u673a\u6216\u670d\u52a1\u5668\u3002\u00a0 \u00a0 \u547d\u4ee4\u884c\u53c2\u6570\u9009\u9879\u8bf4\u660e\u5982\u4e0b\uff1a-q\u00a0\u4e0d\u8f93\u51fa\u7c7b\u540d\u3001Jar\u540d\u548c\u4f20\u5165main\u65b9\u6cd5\u7684\u53c2\u6570-m\u00a0\u8f93\u51fa\u4f20\u5165main\u65b9\u6cd5\u7684\u53c2\u6570-l\u00a0\u8f93\u51famain\u7c7b\u6216Jar\u7684\u5168\u9650\u540d-v\u00a0\u8f93\u51fa\u4f20\u5165JVM\u7684\u53c2\u6570
\n\u6bd4\u5982\u4e0b\u9762\uff1aroot@ubuntu:\/#\u00a0jps\u00a0-m\u00a0-l2458\u00a0org.artifactory.standalone.main.Main\u00a0\/usr\/local\/artifactory-2.2.5\/etc\/jetty.xml29920\u00a0com.sun.tools.hat.Main\u00a0-port\u00a09998\u00a0\/tmp\/dump.dat3149\u00a0org.apache.catalina.startup.Bootstrap\u00a0start30972\u00a0sun.tools.jps.Jps\u00a0-m\u00a0-l8247\u00a0org.apache.catalina.startup.Bootstrap\u00a0start25687\u00a0com.sun.tools.hat.Main\u00a0-port\u00a09999\u00a0dump.dat21711\u00a0mrf-center.jar<\/p>\n

B\u3001\u00a0jstack<\/strong>\u00a0 \u00a0 jstack\u4e3b\u8981\u7528\u6765\u67e5\u770b\u67d0\u4e2aJava\u8fdb\u7a0b\u5185\u7684\u7ebf\u7a0b\u5806\u6808\u4fe1\u606f\u3002\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1ajstack\u00a0[option]\u00a0pidjstack\u00a0[option]\u00a0executable\u00a0corejstack\u00a0[option]\u00a0[server-id@]remote-hostname-or-ip
\n\u547d\u4ee4\u884c\u53c2\u6570\u9009\u9879\u8bf4\u660e\u5982\u4e0b\uff1a-l\u00a0long\u00a0listings\uff0c\u4f1a\u6253\u5370\u51fa\u989d\u5916\u7684\u9501\u4fe1\u606f\uff0c\u5728\u53d1\u751f\u6b7b\u9501\u65f6\u53ef\u4ee5\u7528jstack\u00a0-l\u00a0pid\u6765\u89c2\u5bdf\u9501\u6301\u6709\u60c5\u51b5-m\u00a0mixed\u00a0mode\uff0c\u4e0d\u4ec5\u4f1a\u8f93\u51faJava\u5806\u6808\u4fe1\u606f\uff0c\u8fd8\u4f1a\u8f93\u51faC\/C++\u5806\u6808\u4fe1\u606f\uff08\u6bd4\u5982Native\u65b9\u6cd5\uff09
\njstack\u53ef\u4ee5\u5b9a\u4f4d\u5230\u7ebf\u7a0b\u5806\u6808\uff0c\u6839\u636e\u5806\u6808\u4fe1\u606f\u6211\u4eec\u53ef\u4ee5\u5b9a\u4f4d\u5230\u5177\u4f53\u4ee3\u7801\uff0c\u6240\u4ee5\u5b83\u5728JVM\u6027\u80fd\u8c03\u4f18\u4e2d\u4f7f\u7528\u5f97\u975e\u5e38\u591a\u3002\u4e0b\u9762\u6211\u4eec\u6765\u4e00\u4e2a\u5b9e\u4f8b\u627e\u51fa\u67d0\u4e2aJava\u8fdb\u7a0b\u4e2d\u6700\u8017\u8d39CPU\u7684Java\u7ebf\u7a0b\u5e76\u5b9a\u4f4d\u5806\u6808\u4fe1\u606f\uff0c\u7528\u5230\u7684\u547d\u4ee4\u6709ps\u3001top\u3001printf\u3001jstack\u3001grep\u3002\u00a0 \u00a0 \u7b2c\u4e00\u6b65\u5148\u627e\u51faJava\u8fdb\u7a0bID\uff0c\u6211\u90e8\u7f72\u5728\u670d\u52a1\u5668\u4e0a\u7684Java\u5e94\u7528\u540d\u79f0\u4e3amrf-center\uff1aroot@ubuntu:\/#\u00a0ps\u00a0-ef\u00a0|\u00a0grep\u00a0mrf-center\u00a0|\u00a0grep\u00a0-v\u00a0grep
\nroot\u00a0\u00a0\u00a0\u00a0\u00a021711\u00a0\u00a0\u00a0\u00a0\u00a01\u00a0\u00a01\u00a014:47\u00a0pts\/3\u00a0\u00a0\u00a0\u00a000:02:10\u00a0java\u00a0-jar\u00a0mrf-center.jar
\n\u5f97\u5230\u8fdb\u7a0bID\u4e3a21711\uff0c\u7b2c\u4e8c\u6b65\u627e\u51fa\u8be5\u8fdb\u7a0b\u5185\u6700\u8017\u8d39CPU\u7684\u7ebf\u7a0b\uff0c\u53ef\u4ee5\u4f7f\u7528ps -Lfp pid\u6216\u8005ps -mp pid -o THREAD, tid, time\u6216\u8005top -Hp pid\uff0c\u6211\u8fd9\u91cc\u7528\u7b2c\u4e09\u4e2a\uff0c\u8f93\u51fa\u5982\u4e0b\uff1a\"\"\u00a0 \u00a0 TIME\u5217\u5c31\u662f\u5404\u4e2aJava\u7ebf\u7a0b\u8017\u8d39\u7684CPU\u65f6\u95f4\uff0cCPU\u65f6\u95f4\u6700\u957f\u7684\u662f\u7ebf\u7a0bID\u4e3a21742\u7684\u7ebf\u7a0b\uff0c\u7528printf\u00a0“%x\\n”\u00a021742
\n\u5f97\u523021742\u7684\u5341\u516d\u8fdb\u5236\u503c\u4e3a54ee\uff0c\u4e0b\u9762\u4f1a\u7528\u5230\u3002 \u00a0 \u00a0\u00a0 \u00a0 OK\uff0c\u4e0b\u4e00\u6b65\u7ec8\u4e8e\u8f6e\u5230jstack\u4e0a\u573a\u4e86\uff0c\u5b83\u7528\u6765\u8f93\u51fa\u8fdb\u7a0b21711\u7684\u5806\u6808\u4fe1\u606f\uff0c\u7136\u540e\u6839\u636e\u7ebf\u7a0bID\u7684\u5341\u516d\u8fdb\u5236\u503cgrep\uff0c\u5982\u4e0b\uff1aroot@ubuntu:\/#\u00a0jstack\u00a021711\u00a0|\u00a0grep\u00a054ee”PollIntervalRetrySchedulerThread”\u00a0prio=10\u00a0tid=0x00007f950043e000\u00a0nid=0x54ee\u00a0in\u00a0Object.wait()\u00a0[0x00007f94c6eda000]
\n\u53ef\u4ee5\u770b\u5230CPU\u6d88\u8017\u5728PollIntervalRetrySchedulerThread\u8fd9\u4e2a\u7c7b\u7684Object.wait()\uff0c\u6211\u627e\u4e86\u4e0b\u6211\u7684\u4ee3\u7801\uff0c\u5b9a\u4f4d\u5230\u4e0b\u9762\u7684\u4ee3\u7801\uff1a\"\"\u5b83\u662f\u8f6e\u8be2\u4efb\u52a1\u7684\u7a7a\u95f2\u7b49\u5f85\u4ee3\u7801\uff0c\u4e0a\u9762\u7684sigLock.wait(timeUntilContinue)\u5c31\u5bf9\u5e94\u4e86\u524d\u9762\u7684Object.wait()\u3002<\/p>\n

C\u3001\u00a0jmap\uff08Memory Map\uff09\u548cjhat\uff08Java Heap Analysis Tool\uff09<\/strong>\u00a0 \u00a0 jmap\u7528\u6765\u67e5\u770b\u5806\u5185\u5b58\u4f7f\u7528\u72b6\u51b5\uff0c\u4e00\u822c\u7ed3\u5408jhat\u4f7f\u7528\u3002\u00a0 \u00a0 jmap\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1ajmap\u00a0[option]\u00a0pidjmap\u00a0[option]\u00a0executable\u00a0corejmap\u00a0[option]\u00a0[server-id@]remote-hostname-or-ip
\n\u5982\u679c\u8fd0\u884c\u572864\u4f4dJVM\u4e0a\uff0c\u53ef\u80fd\u9700\u8981\u6307\u5b9a-J-d64\u547d\u4ee4\u9009\u9879\u53c2\u6570\u3002jmap\u00a0-permstat\u00a0pid
\n\u6253\u5370\u8fdb\u7a0b\u7684\u7c7b\u52a0\u8f7d\u5668\u548c\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u7684\u6301\u4e45\u4ee3\u5bf9\u8c61\u4fe1\u606f\uff0c\u8f93\u51fa\uff1a\u7c7b\u52a0\u8f7d\u5668\u540d\u79f0\u3001\u5bf9\u8c61\u662f\u5426\u5b58\u6d3b\uff08\u4e0d\u53ef\u9760\uff09\u3001\u5bf9\u8c61\u5730\u5740\u3001\u7236\u7c7b\u52a0\u8f7d\u5668\u3001\u5df2\u52a0\u8f7d\u7684\u7c7b\u5927\u5c0f\u7b49\u4fe1\u606f\uff0c\u5982\u4e0b\u56fe\uff1a\"\"\u00a0 \u00a0\u4f7f\u7528jmap -heap pid\u67e5\u770b\u8fdb\u7a0b\u5806\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u5305\u62ec\u4f7f\u7528\u7684GC\u7b97\u6cd5\u3001\u5806\u914d\u7f6e\u53c2\u6570\u548c\u5404\u4ee3\u4e2d\u5806\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002\u6bd4\u5982\u4e0b\u9762\u7684\u4f8b\u5b50\uff1a\"\"\"\"
\n\u4f7f\u7528jmap -histo[:live] pid\u67e5\u770b\u5806\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u6570\u76ee\u3001\u5927\u5c0f\u7edf\u8ba1\u76f4\u65b9\u56fe\uff0c\u5982\u679c\u5e26\u4e0alive\u5219\u53ea\u7edf\u8ba1\u6d3b\u5bf9\u8c61\uff0c\u5982\u4e0b\uff1a\"\"class name\u662f\u5bf9\u8c61\u7c7b\u578b\uff0c\u8bf4\u660e\u5982\u4e0b\uff1aB\u00a0\u00a0byteC\u00a0\u00a0charD\u00a0\u00a0doubleF\u00a0\u00a0floatI\u00a0\u00a0intJ\u00a0\u00a0longZ\u00a0\u00a0boolean[\u00a0\u00a0\u6570\u7ec4\uff0c\u5982[I\u8868\u793aint[]
\n[L+\u7c7b\u540d\u00a0\u5176\u4ed6\u5bf9\u8c61\u8fd8\u6709\u4e00\u4e2a\u5f88\u5e38\u7528\u7684\u60c5\u51b5\u662f\uff1a\u7528jmap\u628a\u8fdb\u7a0b\u5185\u5b58\u4f7f\u7528\u60c5\u51b5dump\u5230\u6587\u4ef6\u4e2d\uff0c\u518d\u7528jhat\u5206\u6790\u67e5\u770b\u3002jmap\u8fdb\u884cdump\u547d\u4ee4\u683c\u5f0f\u5982\u4e0b\uff1a
\njmap\u00a0-dump:format=b,file=dumpFileName pid
\n\u6211\u4e00\u6837\u5730\u5bf9\u4e0a\u9762\u8fdb\u7a0bID\u4e3a21711\u8fdb\u884cDump\uff1aroot@ubuntu:\/#\u00a0jmap\u00a0-dump:format=b,file=\/tmp\/dump.dat\u00a021711
\nDumping\u00a0heap\u00a0to\u00a0\/tmp\/dump.dat\u00a0…
\nHeap\u00a0dump\u00a0file\u00a0created
\ndump\u51fa\u6765\u7684\u6587\u4ef6\u53ef\u4ee5\u7528MAT\u3001VisualVM\u7b49\u5de5\u5177\u67e5\u770b\uff0c\u8fd9\u91cc\u7528jhat\u67e5\u770b\uff1a.\"\"
\n\u6ce8\u610f\u5982\u679cDump\u6587\u4ef6\u592a\u5927\uff0c\u53ef\u80fd\u9700\u8981\u52a0\u4e0a-J-Xmx512m\u8fd9\u79cd\u53c2\u6570\u6307\u5b9a\u6700\u5927\u5806\u5185\u5b58\uff0c\u5373jhat -J-Xmx512m -port 9998 \/tmp\/dump.dat\u3002\u7136\u540e\u5c31\u53ef\u4ee5\u5728\u6d4f\u89c8\u5668\u4e2d\u8f93\u5165\u4e3b\u673a\u5730\u5740:9998\u67e5\u770b\u4e86\uff1a\"\"\u00a0 \u00a0 \u4e0a\u9762\u7ea2\u7ebf\u6846\u51fa\u6765\u7684\u90e8\u5206\u5927\u5bb6\u53ef\u4ee5\u81ea\u5df1\u53bb\u6478\u7d22\u4e0b\uff0c\u6700\u540e\u4e00\u9879\u652f\u6301OQL\uff08\u5bf9\u8c61\u67e5\u8be2\u8bed\u8a00\uff09\u3002
\nD\u3001jstat\uff08JVM\u7edf\u8ba1\u76d1\u6d4b\u5de5\u5177\uff09<\/strong>\u00a0 \u00a0 \u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1ajstat\u00a0[\u00a0generalOption\u00a0|\u00a0outputOptions\u00a0vmid\u00a0[interval[s|ms]\u00a0[count]]\u00a0]
\nvmid\u662fJava\u865a\u62df\u673aID\uff0c\u5728Linux\/Unix\u7cfb\u7edf\u4e0a\u4e00\u822c\u5c31\u662f\u8fdb\u7a0bID\u3002interval\u662f\u91c7\u6837\u65f6\u95f4\u95f4\u9694\u3002count\u662f\u91c7\u6837\u6570\u76ee\u3002\u6bd4\u5982\u4e0b\u9762\u8f93\u51fa\u7684\u662fGC\u4fe1\u606f\uff0c\u91c7\u6837\u65f6\u95f4\u95f4\u9694\u4e3a250ms\uff0c\u91c7\u6837\u6570\u4e3a4\uff1a\"\"
\n\u8981\u660e\u767d\u4e0a\u9762\u5404\u5217\u7684\u610f\u4e49\uff0c\u5148\u770bJVM\u5806\u5185\u5b58\u5e03\u5c40\uff1a\"\"\u00a0 \u00a0 \u53ef\u4ee5\u770b\u51fa\uff1a\u5806\u5185\u5b58\u00a0=\u00a0\u5e74\u8f7b\u4ee3\u00a0+\u00a0\u5e74\u8001\u4ee3\u00a0+\u00a0\u6c38\u4e45\u4ee3
\n\u5e74\u8f7b\u4ee3\u00a0=\u00a0Eden\u533a\u00a0+\u00a0\u4e24\u4e2aSurvivor\u533a\uff08From\u548cTo\uff09
\n\u73b0\u5728\u6765\u89e3\u91ca\u5404\u5217\u542b\u4e49\uff1aS0C\u3001S1C\u3001S0U\u3001S1U\uff1aSurvivor\u00a00\/1\u533a\u5bb9\u91cf\uff08Capacity\uff09\u548c\u4f7f\u7528\u91cf\uff08Used\uff09
\nEC\u3001EU\uff1aEden\u533a\u5bb9\u91cf\u548c\u4f7f\u7528\u91cf
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