{"id":1019,"date":"2018-09-07T10:26:25","date_gmt":"2018-09-07T02:26:25","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=1019"},"modified":"2018-09-07T10:26:25","modified_gmt":"2018-09-07T02:26:25","slug":"jvm%e5%86%85%e5%ad%98%e8%ae%be%e7%bd%ae%e5%a4%9a%e5%a4%a7%e5%90%88%e9%80%82%ef%bc%9fxmx%e5%92%8cxmn%e5%a6%82%e4%bd%95%e8%ae%be%e7%bd%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=1019","title":{"rendered":"JVM\u5185\u5b58\u8bbe\u7f6e\u591a\u5927\u5408\u9002\uff1fXmx\u548cXmn\u5982\u4f55\u8bbe\u7f6e\uff1f"},"content":{"rendered":"\n
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\u95ee\u9898:<\/strong><\/div>\n
\u65b0\u4e0a\u7ebf\u4e00\u4e2ajava\u670d\u52a1\uff0c\u6216\u8005\u662fRPC\u6216\u8005\u662fWEB\u7ad9\u70b9\uff0c \u5185\u5b58\u7684\u8bbe\u7f6e\u8be5\u600e\u4e48\u8bbe\u7f6e\u5462\uff1f\u8bbe\u7f6e\u6210\u591a\u5927\u6bd4\u8f83\u5408\u9002\uff0c\u65e2\u4e0d\u6d6a\u8d39\u5185\u5b58\uff0c\u53c8\u4e0d\u5f71\u54cd\u6027\u80fd\u5462\uff1f<\/div>\n<\/div>\n
\u00a0<\/strong><\/div>\n
\u5206\u6790\uff1a<\/strong><\/div>\n

\u4f9d\u636e\u7684\u539f\u5219\u662f\u6839\u636eJava Performance\u91cc\u9762\u7684\u63a8\u8350\u516c\u5f0f\u6765\u8fdb\u884c\u8bbe\u7f6e\u3002<\/p>\n

\"WX20171103-112002.png\"<\/a><\/p>\n

\u00a0<\/div>\n<\/div>\n
\u5177\u4f53\u6765\u8bb2\uff1a<\/div>\n
\n
Java\u6574\u4e2a\u5806\u5927\u5c0f\u8bbe\u7f6e\uff0cXmx \u548c Xms\u8bbe\u7f6e\u4e3a\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u76843-4\u500d\uff0c\u5373FullGC\u4e4b\u540e\u7684\u8001\u5e74\u4ee3\u5185\u5b58\u5360\u7528\u76843-4\u500d<\/div>\n
\u6c38\u4e45\u4ee3 PermSize\u548cMaxPermSize\u8bbe\u7f6e\u4e3a\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u76841.2-1.5\u500d\u3002<\/div>\n
\u5e74\u8f7b\u4ee3Xmn\u7684\u8bbe\u7f6e\u4e3a\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u76841-1.5\u500d\u3002<\/div>\n
\u8001\u5e74\u4ee3\u7684\u5185\u5b58\u5927\u5c0f\u8bbe\u7f6e\u4e3a\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u76842-3\u500d\u3002<\/div>\n
\u00a0<\/div>\n
BTW\uff1a<\/div>\n<\/div>\n<\/div>\n
\u00a0 \u00a0 \u00a01\u3001Sun\u5b98\u65b9\u5efa\u8bae\u5e74\u8f7b\u4ee3\u7684\u5927\u5c0f\u4e3a\u6574\u4e2a\u5806\u76843\/8\u5de6\u53f3\uff0c \u6240\u4ee5\u6309\u7167\u4e0a\u8ff0\u8bbe\u7f6e\u7684\u65b9\u5f0f\uff0c\u57fa\u672c\u7b26\u5408Sun\u7684\u5efa\u8bae\u3002\u00a0<\/div>\n
\u00a0 \u00a0 \u00a02\u3001\u5806\u5927\u5c0f=\u5e74\u8f7b\u4ee3\u5927\u5c0f+\u5e74\u8001\u4ee3\u5927\u5c0f\uff0c \u5373xmx=xmn+\u8001\u5e74\u4ee3\u5927\u5c0f \u3002 Permsize\u4e0d\u5f71\u54cd\u5806\u5927\u5c0f\u3002<\/div>\n
\n
\u00a0 \u00a0 \u00a03\u3001\u4e3a\u4ec0\u4e48\u8981\u6309\u7167\u4e0a\u9762\u7684\u6765\u8fdb\u884c\u8bbe\u7f6e\u5462\uff1f \u6ca1\u6709\u5177\u4f53\u7684\u8bf4\u660e\uff0c\u4f46\u5e94\u8be5\u662f\u6839\u636e\u591a\u79cd\u8c03\u4f18\u4e4b\u540e\u5f97\u51fa\u7684\u4e00\u4e2a\u7ed3\u8bba\u3002<\/div>\n
\n
\u00a0<\/div>\n
\u5982\u4f55\u786e\u8ba4\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u5927\u5c0f\uff1f<\/div>\n
\u65b9\u5f0f1\uff08\u63a8\u8350\/\u6bd4\u8f83\u7a33\u59a5\uff09\uff1a<\/strong><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0JVM\u53c2\u6570\u4e2d\u6dfb\u52a0GC\u65e5\u5fd7\uff0cGC\u65e5\u5fd7\u4e2d\u4f1a\u8bb0\u5f55\u6bcf\u6b21FullGC\u4e4b\u540e\u5404\u4ee3\u7684\u5185\u5b58\u5927\u5c0f\uff0c\u89c2\u5bdf\u8001\u5e74\u4ee3GC\u4e4b\u540e\u7684\u7a7a\u95f4\u5927\u5c0f\u3002\u53ef\u89c2\u5bdf\u4e00\u6bb5\u65f6\u95f4\u5185\uff08\u6bd4\u59822\u5929\uff09\u7684FullGC\u4e4b\u540e\u7684\u5185\u5b58\u60c5\u51b5\uff0c\u6839\u636e\u591a\u6b21\u7684FullGC\u4e4b\u540e\u7684\u8001\u5e74\u4ee3\u7684\u7a7a\u95f4\u5927\u5c0f\u6570\u636e\u6765\u9884\u4f30FullGC\u4e4b\u540e\u8001\u5e74\u4ee3\u7684\u5b58\u6d3b\u5bf9\u8c61\u5927\u5c0f\uff08\u53ef\u6839\u636e\u591a\u6b21FullGC\u4e4b\u540e\u7684\u5185\u5b58\u5927\u5c0f\u53d6\u5e73\u5747\u503c\uff09<\/div>\n
\u00a0<\/div>\n
\u65b9\u5f0f2\uff1a\uff08\u5f3a\u5236\u89e6\u53d1FullGC, \u4f1a\u5f71\u54cd\u7ebf\u4e0a\u670d\u52a1\uff0c\u614e\u7528\uff09<\/strong><\/div>\n
\u00a0 \u00a0 \u00a0\u65b9\u5f0f1\u7684\u65b9\u5f0f\u6bd4\u8f83\u53ef\u884c\uff0c\u4f46\u9700\u8981\u66f4\u6539JVM\u53c2\u6570\uff0c\u5e76\u5206\u6790\u65e5\u5fd7\u3002\u540c\u65f6\uff0c\u5728\u4f7f\u7528CMS\u56de\u6536\u5668\u7684\u65f6\u5019\uff0c\u6709\u53ef\u80fd\u4e0d\u80fd\u89e6\u53d1FullGC\uff08\u53ea\u53d1\u751fCMS GC\uff09\uff0c\u6240\u4ee5\u65e5\u5fd7\u4e2d\u5e76\u6ca1\u6709\u8bb0\u5f55FullGC\u7684\u65e5\u5fd7\u3002\u5728\u5206\u6790\u7684\u65f6\u5019\u5c31\u6bd4\u8f83\u96be\u5904\u7406\u3002<\/div>\n
\u00a0 \u00a0 \u00a0BTW\uff1a\u4f7f\u7528jstat -gcutil\u5de5\u5177\u6765\u770bFullGC\u7684\u65f6\u5019\uff0c CMS GC\u662f\u4f1a\u9020\u62102\u6b21\u7684FullGC\u6b21\u6570\u589e\u52a0\u3002 \u5177\u4f53\u53ef\u53c2\u89c1\u4e4b\u524d\u5199\u7684\u4e00\u7bc7\u5173\u4e8ejstat\u4f7f\u7528\u7684\u6587\u7ae0<\/div>\n
\u00a0 \u00a0 \u00a0\u6240\u4ee5\uff0c\u6709\u65f6\u5019\u9700\u8981\u5f3a\u5236\u89e6\u53d1\u4e00\u6b21FullGC\uff0c\u6765\u89c2\u5bdfFullGC\u4e4b\u540e\u7684\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u5927\u5c0f\u3002<\/div>\n<\/div>\n
\u00a0 \u00a0 \u00a0\u6ce8\uff1a\u5f3a\u5236\u89e6\u53d1FullGC\uff0c\u4f1a\u9020\u6210\u7ebf\u4e0a\u670d\u52a1\u505c\u987f\uff08STW\uff09\uff0c\u8981\u8c28\u614e\uff0c\u5efa\u8bae\u7684\u64cd\u4f5c\u65b9\u5f0f\u4e3a\uff0c\u5728\u5f3a\u5236FullGC\u524d\u5148\u628a\u670d\u52a1\u8282\u70b9\u6458\u9664\uff0cFullGC\u4e4b\u540e\u518d\u5c06\u670d\u52a1\u6302\u56de\u53ef\u7528\u8282\u70b9\uff0c\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1<\/div>\n
\u00a0 \u00a0 \u00a0\u5728\u4e0d\u540c\u65f6\u95f4\u6bb5\u89e6\u53d1FullGC\uff0c\u6839\u636e\u591a\u6b21FullGC\u4e4b\u540e\u7684\u8001\u5e74\u4ee3\u5185\u5b58\u60c5\u51b5\u6765\u9884\u4f30FullGC\u4e4b\u540e\u7684\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u5927\u5c0f<\/div>\n
\u00a0<\/div>\n
\u5982\u4f55\u89e6\u53d1FullGC \uff1f<\/strong><\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u4f7f\u7528jmap\u5de5\u5177\u53ef\u89e6\u53d1FullGC\u00a0<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0jmap -dump:live,format=b,file=heap.bin <pid> \u5c06\u5f53\u524d\u7684\u5b58\u6d3b\u5bf9\u8c61dump\u5230\u6587\u4ef6\uff0c\u6b64\u65f6\u4f1a\u89e6\u53d1FullGC<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0jmap -histo:live <pid>\u00a0\u6253\u5370\u6bcf\u4e2aclass\u7684\u5b9e\u4f8b\u6570\u76ee,\u5185\u5b58\u5360\u7528,\u7c7b\u5168\u540d\u4fe1\u606f.live\u5b50\u53c2\u6570\u52a0\u4e0a\u540e,\u53ea\u7edf\u8ba1\u6d3b\u7684\u5bf9\u8c61\u6570\u91cf. \u6b64\u65f6\u4f1a\u89e6\u53d1FullGC<\/div>\n
\u00a0<\/div>\n<\/div>\n
\u5177\u4f53\u64cd\u4f5c\u5b9e\u4f8b\uff1a<\/strong><\/div>\n
\u4ee5\u6211\u53f8\u7684\u4e00\u4e2aRPC\u670d\u52a1\u4e3a\u4f8b\u3002<\/div>\n
BTW\uff1a\u521a\u4e0a\u7ebf\u7684\u65b0\u670d\u52a1\uff0c\u4e0d\u77e5\u9053\u8be5\u8bbe\u7f6e\u591a\u5927\u7684\u5185\u5b58\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u5148\u591a\u8bbe\u7f6e\u4e00\u70b9\u5185\u5b58\uff0c\u7136\u540e\u6839\u636eGC\u4e4b\u540e\u7684\u60c5\u51b5\u6765\u8fdb\u884c\u5206\u6790\u3002<\/div>\n
\u521d\u59cbJVM\u5185\u5b58\u53c2\u6570\u8bbe\u7f6e\u4e3a\uff1a\u00a0Xmx=2G Xms=2G xmn=1G\u00a0<\/div>\n
\u00a0<\/div>\n

\u4f7f\u7528jstat \u67e5\u770b\u5f53\u524d\u7684GC\u60c5\u51b5\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n

\"WX20171103-112025.png\"<\/a><\/p>\n

\u00a0<\/div>\n
YGC\u5e73\u5747\u8017\u65f6\uff1a 173.825s\/15799=11ms<\/div>\n
FGC\u5e73\u5747\u8017\u65f6\uff1a0.817s\/41=19.9ms<\/div>\n
\u5e73\u5747\u5927\u7ea610-20s\u4f1a\u4ea7\u751f\u4e00\u6b21YGC<\/div>\n
\u00a0<\/div>\n
\u770b\u8d77\u6765\u4f3c\u4e4e\u4e0d\u9519\uff0cYGC\u89e6\u53d1\u7684\u9891\u7387\u4e0d\u9ad8\uff0cFGC\u7684\u8017\u65f6\u4e5f\u4e0d\u9ad8\uff0c\u4f46\u8fd9\u6837\u7684\u5185\u5b58\u8bbe\u7f6e\u662f\u4e0d\u662f\u6709\u4e9b\u6d6a\u8d39\u5462\uff1f<\/div>\n
\u4e3a\u4e86\u5feb\u901f\u770b\u6570\u636e\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u65b9\u5f0f2\uff0c\u4ea7\u751f\u4e86\u51e0\u6b21FullGC\uff0cFullGC\u4e4b\u540e\uff0c\u4f7f\u7528\u7684jmap -heap \u6765\u770b\u7684\u5f53\u524d\u7684\u5806\u5185\u5b58\u60c5\u51b5\uff08\u4e5f\u53ef\u4ee5\u6839\u636eGC\u65e5\u5fd7\u6765\u770b\uff09<\/div>\n

heap\u60c5\u51b5\u5982\u4e0b\u56fe\uff1a\uff08\u547d\u4ee4 \uff1a jmap -heap <pid>\uff09<\/p>\n

\"WX20171103-112039.png\"<\/a><\/p>\n

\u00a0<\/div>\n
\u4e0a\u56fe\u4e2d\u7684concurrent mark-sweep generation\u5373\u4e3a\u8001\u5e74\u4ee3\u7684\u5185\u5b58\u63cf\u8ff0\u3002<\/div>\n
\u8001\u5e74\u4ee3\u7684\u5185\u5b58\u5360\u7528\u4e3a100M\u5de6\u53f3\u3002 \u6309\u7167\u6574\u4e2a\u5806\u5927\u5c0f\u662f\u8001\u5e74\u4ee3\uff08FullGC\uff09\u4e4b\u540e\u76843-4\u500d\u8ba1\u7b97\u7684\u8bdd\uff0c\u8bbe\u7f6e\u5404\u4ee3\u7684\u5185\u5b58\u60c5\u51b5\u5982\u4e0b\uff1a<\/div>\n
\u00a0 \u00a0 \u00a0Xmx=512m \u00a0Xms=512m \u00a0Xmn=128m PermSize=128m \u00a0\u8001\u5e74\u4ee3\u7684\u5927\u5c0f\u4e3a \uff08512-128=384m\uff09\u4e3a\u8001\u5e74\u4ee3\u5b58\u6d3b\u5bf9\u8c61\u5927\u5c0f\u76843\u500d\u5de6\u53f3<\/div>\n

\u8c03\u6574\u4e4b\u540e\u7684\uff0cheap\u60c5\u51b5<\/p>\n

\"WX20171103-112102.png\"<\/a><\/p>\n

\u00a0<\/div>\n

GC\u60c5\u51b5\u5982\u4e0b\uff1a<\/p>\n

\"WX20171103-112111.png\"<\/a><\/p>\n

\u00a0<\/div>\n
YGC \u5dee\u4e0d\u591a\u572810s\u5de6\u53f3\u89e6\u53d1\u4e00\u6b21\u3002\u6bcf\u6b21YGC\u5e73\u5747\u8017\u65f6\u5927\u7ea69.41ms\u3002\u53ef\u63a5\u53d7\u3002<\/div>\n
FGC\u5e73\u5747\u8017\u65f6\uff1a0.016s\/2=8ms<\/div>\n
\u6574\u4f53\u7684GC\u8017\u65f6\u51cf\u5c11\u3002\u4f46GC\u9891\u7387\u6bd4\u4e4b\u524d\u76842G\u65f6\u7684\u8981\u591a\u4e86\u4e00\u4e9b\u3002<\/div>\n
\u00a0<\/div>\n
\u6ce8\uff1a\u00a0\u770b\u4e0a\u8ff0GC\u7684\u65f6\u5019\uff0c\u53d1\u73b0YGC\u7684\u6b21\u6570\u7a81\u7136\u4f1a\u589e\u591a\u5f88\u591a\u4e2a\uff0c\u6bd4\u5982 \u4ece1359\u6b21\u5230\u4e861364\u6b21\u3002\u5177\u4f53\u539f\u56e0\u662f\uff1f<\/strong><\/div>\n
\u00a0<\/div>\n
\u603b\u7ed3\uff1a<\/strong><\/div>\n
\u5728\u5185\u5b58\u76f8\u5bf9\u7d27\u5f20\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u6309\u7167\u4e0a\u8ff0\u7684\u65b9\u5f0f\u6765\u8fdb\u884c\u5185\u5b58\u7684\u8c03\u4f18\uff0c \u627e\u5230\u4e00\u4e2a\u5728GC\u9891\u7387\u548cGC\u8017\u65f6\u4e0a\u90fd\u53ef\u63a5\u53d7\u7684\u4e00\u4e2a\u5185\u5b58\u8bbe\u7f6e\uff0c\u53ef\u4ee5\u7528\u8f83\u5c0f\u7684\u5185\u5b58\u6ee1\u8db3\u5f53\u524d\u7684\u670d\u52a1\u9700\u8981<\/div>\n
\u4f46\u5f53\u5185\u5b58\u76f8\u5bf9\u5bbd\u88d5\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u76f8\u5bf9\u7ed9\u670d\u52a1\u591a\u589e\u52a0\u4e00\u70b9\u5185\u5b58\uff0c\u53ef\u4ee5\u51cf\u5c11GC\u7684\u9891\u7387\uff0cGC\u7684\u8017\u65f6\u76f8\u5e94\u4f1a\u589e\u52a0\u4e00\u4e9b\u3002 \u4e00\u822c\u8981\u6c42\u4f4e\u5ef6\u65f6\u7684\u53ef\u4ee5\u8003\u8651\u591a\u8bbe\u7f6e\u4e00\u70b9\u5185\u5b58\uff0c \u5bf9\u5ef6\u65f6\u8981\u6c42\u4e0d\u9ad8\u7684\uff0c\u53ef\u4ee5\u6309\u7167\u4e0a\u8ff0\u65b9\u5f0f\u8bbe\u7f6e\u8f83\u5c0f\u5185\u5b58\u3002\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u8865\u5145\uff1a<\/div>\n
\u6c38\u4e45\u4ee3\uff08\u65b9\u6cd5\u533a\uff09\u5e76\u4e0d\u5728\u5806\u5185\uff0c\u6240\u4ee5\u4e4b\u524d\u6709\u770b\u8fc7\u4e00\u7bc7\u6587\u7ae0\u4e2d\u63cf\u8ff0\u7684 \u6574\u4e2a\u5806\u5927\u5c0f=\u5e74\u8f7b\u4ee3+\u5e74\u8001\u4ee3+\u6c38\u4e45\u4ee3\u7684\u63cf\u8ff0\u662f\u4e0d\u6b63\u786e\u7684\u3002\u00a0<\/div>\n","protected":false},"excerpt":{"rendered":"

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