\n
\n
\u4f5c\u8005\uff1a\u6c5f\u5357\u767d\u8863<\/FONT><\/A>\uff0c\u6700\u65b0\u7248\u94fe\u63a5\uff1ahttp:\/\/blog.csdn.net\/calvinxiu\/archive\/2007\/05\/18\/1614473.aspx<\/FONT><\/A>\uff0c\u7248\u6743\u6240\u6709\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u6587\u94fe\u63a5\u3002 <\/P> \u539f\u672c\u60f3\u628a\u9898\u76ee\u66f4\u7b80\u5355\u7684\u5b9a\u4e3a–\u300a\u4e0d\u8981\u505c\u300b\u7684\uff0c\u4f46\u8fd8\u662f\u81ea\u5df1YY\u4e00\u4e0b\u5c31\u7b97\u4e86\u3002 \u4e00\u3001\u53c2\u8003\u8d44\u6599\uff1a<\/STRONG> <\/P> \u4e8c\u3001\u57fa\u672c\u6982\u5ff5<\/STRONG> <\/P> 1\u3001\u5806(Heap)<\/STRONG> <\/P> JVM\u7ba1\u7406\u7684\u5185\u5b58\u53eb\u5806\u3002\u572832Bit\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u67091.5G-2G\u7684\u9650\u5236\uff0c\u800c64Bit\u7684\u5c31\u6ca1\u6709\u3002 <\/P> JVM\u521d\u59cb\u5206\u914d\u7684\u5185\u5b58\u7531-Xms\u6307\u5b9a\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/64\u4f46\u5c0f\u4e8e1G\u3002 <\/P> JVM\u6700\u5927\u5206\u914d\u7684\u5185\u5b58\u7531-Xmx\u6307\u5b9a\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/4\u4f46\u5c0f\u4e8e1G\u3002 <\/P> \u9ed8\u8ba4\u7a7a\u4f59\u5806\u5185\u5b58\u5c0f\u4e8e40%\u65f6\uff0cJVM\u5c31\u4f1a\u589e\u5927\u5806\u76f4\u5230-Xmx\u7684\u6700\u5927\u9650\u5236\uff0c\u53ef\u4ee5\u7531-XX:MinHeapFreeRatio=\u6307\u5b9a\u3002 \u670d\u52a1\u5668\u4e00\u822c\u8bbe\u7f6e-Xms\u3001-Xmx\u76f8\u7b49\u4ee5\u907f\u514d\u5728\u6bcf\u6b21GC \u540e\u8c03\u6574\u5806\u7684\u5927\u5c0f\uff0c\u6240\u4ee5\u4e0a\u9762\u7684\u4e24\u4e2a\u53c2\u6570\u6ca1\u5565\u7528\u3002 <\/P> <\/STRONG><\/P> 2.\u57fa\u672c\u6536\u96c6\u7b97\u6cd5<\/STRONG> <\/P> \u53ef\u89c1\uff0c\u6ca1\u6709\u514d\u8d39\u7684\u5348\u9910\uff0c\u65e0\u8bba\u91c7\u7528\u590d\u5236\u8fd8\u662f\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\uff0c\u81ea\u52a8\u7684\u4e1c\u897f\u90fd\u8981\u4ed8\u51fa\u5f88\u5927\u7684\u6027\u80fd\u4ee3\u4ef7\u3002 <\/P> 3.\u5206\u4ee3<\/STRONG> <\/P> \u5206\u4ee3\u662fJava\u5783\u573e\u6536\u96c6\u7684\u4e00\u5927\u4eae\u70b9\uff0c\u6839\u636e\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u957f\u77ed\uff0c\u628a\u5806\u5206\u4e3a3\u4e2a\u4ee3\uff1aYoung\uff0cOld\u548cPermanent\uff0c\u6839\u636e\u4e0d\u540c\u4ee3\u7684\u7279\u70b9\u91c7\u7528\u4e0d\u540c\u7684\u6536\u96c6\u7b97\u6cd5\uff0c\u626c\u957f\u907f\u77ed\u4e5f\u3002 <\/P> Young(Nursery)\uff0c\u5e74\u8f7b\u4ee3<\/STRONG>\u3002\u7814\u7a76\u8868\u660e\u5927\u90e8\u5206\u5bf9\u8c61\u90fd\u662f\u671d\u751f\u66ae\u6b7b\uff0c\u968f\u751f\u968f\u706d\u7684\u3002\u56e0\u6b64\u6240\u6709\u6536\u96c6\u5668\u90fd\u4e3a\u5e74\u8f7b\u4ee3\u9009\u62e9\u4e86\u590d\u5236\u7b97\u6cd5\u3002 Young\u7684\u9ed8\u8ba4\u503c\u4e3a4M\uff0c\u968f\u5806\u5185\u5b58\u589e\u5927\uff0c\u7ea6\u4e3a1\/15\uff0cJVM\u4f1a\u6839\u636e\u60c5\u51b5\u52a8\u6001\u7ba1\u7406\u5176\u5927\u5c0f\u53d8\u5316\u3002 Young\u7684\u5927\u5c0f\u975e\u5e38\u975e\u5e38\u91cd\u8981\uff0c\u89c1\u201c\u540e\u9762\u6682\u505c\u65f6\u95f4\u4f18\u5148\u6536\u96c6\u5668\u201d\u7684\u8bba\u8ff0\u3002 <\/P> Young\u91cc\u9762\u53c8\u5206\u4e3a3\u4e2a\u533a\u57df\uff0c\u4e00\u4e2aEden\uff0c\u6240\u6709\u65b0\u5efa\u5bf9\u8c61\u90fd\u4f1a\u5b58\u5728\u4e8e\u8be5\u533a\uff0c\u4e24\u4e2aSurvivor\u533a\uff0c\u7528\u6765\u5b9e\u65bd\u590d\u5236\u7b97\u6cd5\u3002\u6bcf\u6b21\u590d\u5236\u5c31\u662f\u5c06Eden\u548c\u7b2c\u4e00\u5757Survior\u7684\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u7b2c2\u5757\uff0c\u7136\u540e\u6e05\u7a7aEden\u4e0e\u7b2c\u4e00\u5757Survior\u3002Eden\u4e0eSurvivor\u7684\u6bd4\u4f8b\u7531-XX:SurvivorRatio=\u8bbe\u7f6e\uff0c\u9ed8\u8ba4\u4e3a32\u3002Survivio\u5927\u4e86\u4f1a\u6d6a\u8d39\uff0c\u5c0f\u4e86\u7684\u8bdd\uff0c\u4f1a\u4f7f\u4e00\u4e9b\u5e74\u8f7b\u5bf9\u8c61\u6f5c\u9003\u5230\u8001\u4eba\u533a\uff0c\u5f15\u8d77\u8001\u4eba\u533a\u7684\u4e0d\u5b89\uff0c\u4f46\u8fd9\u4e2a\u53c2\u6570\u5bf9\u6027\u80fd\u5e76\u4e0d\u91cd\u8981\u3002 <\/P> Old(Tenured)\uff0c\u5e74\u8001\u4ee3<\/STRONG>\u3002\u5e74\u8f7b\u4ee3\u7684\u5bf9\u8c61\u5982\u679c\u80fd\u591f\u633a\u8fc7\u6570\u6b21\u6536\u96c6\uff0c\u5c31\u4f1a\u8fdb\u5165\u8001\u4eba\u533a\u3002\u8001\u4eba\u533a\u4f7f\u7528\u6807\u8bb0\u6574\u7406\u7b97\u6cd5\u3002\u56e0\u4e3a\u8001\u4eba\u533a\u7684\u5bf9\u8c61\u90fd\u6ca1\u90a3\u4e48\u5bb9\u6613\u6b7b\u7684\uff0c\u91c7\u7528\u590d\u5236\u7b97\u6cd5\u5c31\u8981\u53cd\u590d\u7684\u590d\u5236\u5bf9\u8c61\uff0c\u5f88\u4e0d\u5408\u7b97\uff0c\u53ea\u597d\u91c7\u7528\u6807\u8bb0\u6e05\u7406\u7b97\u6cd5\uff0c\u4f46\u6807\u8bb0\u6e05\u7406\u7b97\u6cd5\u5176\u5b9e\u4e5f\u4e0d\u8f7b\u677e\uff0c\u6bcf\u6b21\u90fd\u8981\u904d\u5386\u533a\u57df\u5185\u6240\u6709\u5bf9\u8c61\uff0c\u6240\u4ee5\u8fd8\u662f\u6ca1\u6709\u514d\u8d39\u7684\u5348\u9910\u554a\u3002 <\/P> -XX:MaxTenuringThreshold=\u8bbe\u7f6e\u71ac\u8fc7\u5e74\u8f7b\u4ee3\u591a\u5c11\u6b21\u6536\u96c6\u540e\u79fb\u5165\u8001\u4eba\u533a\uff0cCMS\u4e2d\u9ed8\u8ba4\u4e3a0\uff0c\u71ac\u8fc7\u7b2c\u4e00\u6b21GC\u5c31\u8f6c\u5165\uff0c\u53ef\u4ee5\u7528-XX:+PrintTenuringDistribution\u67e5\u770b\u3002 <\/P> Permanent\uff0c\u6301\u4e45\u4ee3\u3002<\/STRONG>\u88c5\u8f7dClass\u4fe1\u606f\u7b49\u57fa\u7840\u6570\u636e\uff0c\u9ed8\u8ba464M\uff0c\u5982\u679c\u662f\u7c7b\u5f88\u591a\u5f88\u591a\u7684\u670d\u52a1\u7a0b\u5e8f\uff0c\u9700\u8981\u52a0\u5927\u5176\u8bbe\u7f6e-XX:MaxPermSize=\uff0c\u5426\u5219\u5b83\u6ee1\u4e86\u4e4b\u540e\u4f1a\u5f15\u8d77fullgc()\u6216Out of Memory\u3002 \u6ce8\u610fSpring\uff0cHibernate\u8fd9\u7c7b\u559c\u6b22AOP\u52a8\u6001\u751f\u6210\u7c7b\u7684\u6846\u67b6\u9700\u8981\u66f4\u591a\u7684\u6301\u4e45\u4ee3\u5185\u5b58\u3002 <\/P> 4.minor\/major collection<\/STRONG> <\/P> \u6bcf\u4e2a\u4ee3\u6ee1\u4e86\u4e4b\u540e\u90fd\u4f1a\u4fc3\u53d1collection\uff0c\uff08\u53e6\u5916Concurrent Low Pause Collector\u9ed8\u8ba4\u5728\u8001\u4eba\u533a68%\u7684\u65f6\u5019\u4fc3\u53d1)\u3002GC\u7528\u8f83\u9ad8\u7684\u9891\u7387\u5bf9young\u8fdb\u884c\u626b\u63cf\u548c\u56de\u6536\uff0c\u8fd9\u79cd\u53eb\u505aminor collection\u3002 5.\u5c0f\u7ed3<\/STRONG> <\/P> Young — minor collection — \u590d\u5236\u7b97\u6cd5 <\/P> Old(Tenured) — major colletion — \u6807\u8bb0\u6e05\u9664\/\u6807\u8bb0\u6574\u7406\u7b97\u6cd5 <\/P> <\/STRONG><\/P> \u4e09\u3001\u6536\u96c6\u5668<\/STRONG> <\/P> 1.\u53e4\u8001\u7684\u4e32\u884c\u6536\u96c6\u5668(Serial Collector)<\/STRONG> <\/P> \u4f7f\u7528 -XX:+UseSerialGC\uff0c\u7b56\u7565\u4e3a\u5e74\u8f7b\u4ee3\u4e32\u884c\u590d\u5236\uff0c\u5e74\u8001\u4ee3\u4e32\u884c\u6807\u8bb0\u6574\u7406\u3002 <\/P> 2.\u541e\u5410\u91cf\u4f18\u5148\u7684\u5e76\u884c\u6536\u96c6\u5668(Throughput Collector)<\/STRONG> <\/P> \u4f7f\u7528 -XX:+UseParallelGC \uff0c\u4e5f\u662fJDK5 -server\u7684\u9ed8\u8ba4\u503c\u3002\u7b56\u7565\u4e3a\uff1a \u6240\u4ee5\u9700\u89812+\u7684CPU\u65f6\u624d\u4f1a\u4f18\u4e8e\u4e32\u884c\u6536\u96c6\u5668\uff0c\u9002\u7528\u4e8e\u540e\u53f0\u5904\u7406\uff0c\u79d1\u5b66\u8ba1\u7b97\u3002 <\/P> \u53ef\u4ee5\u4f7f\u7528-XX:MaxGCPauseMillis= \u548c -XX:GCTimeRatio \u6765\u8c03\u6574GC\u7684\u65f6\u95f4\u3002 <\/P> 3.\u6682\u505c\u65f6\u95f4\u4f18\u5148\u7684\u5e76\u53d1\u6536\u96c6\u5668(Concurrent Low Pause Collector-CMS<\/STRONG>)<\/STRONG> <\/P> \u524d\u9762\u8bf4\u4e86\u8fd9\u4e48\u591a\uff0c\u90fd\u662f\u4e3a\u4e86\u8fd9\u8282\u505a\u94fa\u57ab…… <\/P> \u4f7f\u7528-XX:+UseConcMarkSweepGC\uff0c\u7b56\u7565\u4e3a\uff1a 3.1 \u5e74\u8001\u4ee3\u8be6\u8ff0<\/STRONG> <\/P> \u5e76\u884c(Parallel)\u4e0e\u5e76\u53d1(Concurrent)\u4ec5\u4e00\u5b57\u4e4b\u5dee\uff0c\u5e76\u884c\u6307\u591a\u6761\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u5e76\u884c\uff0c\u5e76\u53d1\u6307\u7528\u6237\u7ebf\u7a0b\u4e0e\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u5e76\u53d1\uff0c\u7a0b\u5e8f\u5728\u7ee7\u7eed\u8fd0\u884c\uff0c\u800c\u5783\u573e\u6536\u96c6\u7a0b\u5e8f\u8fd0\u884c\u4e8e\u53e6\u4e00\u4e2a\u4e2aCPU\u4e0a\u3002 <\/P> \u5e76\u53d1\u6536\u96c6\u4e00\u5f00\u59cb\u4f1a\u5f88\u77ed\u6682\u7684\u505c\u6b62\u4e00\u6b21\u6240\u6709\u7ebf\u7a0b\u6765\u5f00\u59cb\u521d\u59cb\u6807\u8bb0\u6839\u5bf9\u8c61\uff0c\u7136\u540e\u6807\u8bb0\u7ebf\u7a0b\u4e0e\u5e94\u7528\u7ebf\u7a0b\u4e00\u8d77\u5e76\u53d1\u8fd0\u884c\uff0c\u6700\u540e\u53c8\u5f88\u77ed\u7684\u6682\u505c\u4e00\u6b21\uff0c\u591a\u7ebf\u7a0b\u5e76\u884c<\/STRONG>\u7684\u91cd\u65b0\u6807\u8bb0\u4e4b\u524d\u53ef\u80fd\u56e0\u4e3a\u5e76\u53d1\u800c\u6f0f\u6389\u7684\u5bf9\u8c61\uff0c\u7136\u540e\u5c31\u5f00\u59cb\u4e0e\u5e94\u7528\u7a0b\u5e8f\u5e76\u53d1\u7684\u6e05\u9664\u8fc7\u7a0b\u3002\u53ef\u89c1\uff0c\u6700\u957f\u7684\u4e24\u4e2a\u904d\u5386\u8fc7\u7a0b\u90fd\u662f\u4e0e\u5e94\u7528\u7a0b\u5e8f\u5e76\u53d1\u6267\u884c\u7684\uff0c\u6bd4\u4ee5\u524d\u7684\u4e32\u884c\u7b97\u6cd5\u6539\u8fdb\u592a\u591a\u592a\u591a\u4e86\uff01\uff01\uff01 <\/P> \u4e32\u884c\u6807\u8bb0\u6e05\u9664\u662f\u7b49\u5e74\u8001\u4ee3\u6ee1\u4e86\u518d\u5f00\u59cb\u6536\u96c6\u7684\uff0c\u800c\u5e76\u53d1\u6536\u96c6\u56e0\u4e3a\u8981\u4e0e\u5e94\u7528\u7a0b\u5e8f\u4e00\u8d77\u8fd0\u884c\uff0c\u5982\u679c\u6ee1\u4e86\u624d\u6536\u96c6\uff0c\u5e94\u7528\u7a0b\u5e8f\u5c31\u65e0\u5185\u5b58\u53ef\u7528\uff0c\u6240\u4ee5\u7cfb\u7edf\u9ed8\u8ba468%\u6ee1\u7684\u65f6\u5019\u5c31\u5f00\u59cb\u6536\u96c6\u3002\u5185\u5b58\u5df2\u8bbe\u5f97\u8f83\u5927\uff0c\u5403\u5185\u5b58\u53c8\u6ca1\u6709\u8fd9\u4e48\u5feb\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u7528-XX:CMSInitiatingOccupancyFraction=\u6070\u5f53\u589e\u5927\u8be5\u6bd4\u7387\u3002 <\/P> 3.2 \u5e74\u8f7b\u4ee3\u8be6\u8ff0<\/STRONG> <\/P> \u53ef\u60dc\u5bf9\u5e74\u8f7b\u4ee3\u7684\u590d\u5236\u6536\u96c6\uff0c\u4f9d\u7136\u5fc5\u987b\u505c\u6b62\u6240\u6709\u5e94\u7528\u7a0b\u5e8f\u7ebf\u7a0b\uff0c\u539f\u7406\u5982\u6b64\uff0c\u53ea\u80fd\u9760\u591aCPU\uff0c\u591a\u6536\u96c6\u7ebf\u7a0b\u5e76\u53d1\u6765\u63d0\u9ad8\u6536\u96c6\u901f\u5ea6\uff0c\u4f46\u9664\u975e\u4f60\u7684Server\u72ec\u5360\u6574\u53f0\u670d\u52a1\u5668\uff0c\u5426\u5219\u5982\u679c\u670d\u52a1\u5668\u4e0a\u672c\u8eab\u8fd8\u6709\u5f88\u591a\u5176\u4ed6\u7ebf\u7a0b\u65f6\uff0c\u5207\u6362\u8d77\u6765\u901f\u5ea6\u5c31….. \u6240\u4ee5\uff0c\u641e\u5230\u6700\u540e\uff0c\u6682\u505c\u65f6\u95f4\u7684\u74f6\u9888\u5c31\u843d\u5728\u4e86\u5e74\u8f7b\u4ee3\u7684\u590d\u5236\u7b97\u6cd5\u4e0a\u3002 <\/P> \u56e0\u6b64Young\u7684\u5927\u5c0f\u8bbe\u7f6e\u633a\u91cd\u8981\u7684\uff0c\u5927\u70b9\u5c31\u4e0d\u7528\u9891\u7e41GC\uff0c\u800c\u4e14\u589e\u5927GC\u7684\u95f4\u9694\u540e\uff0c\u53ef\u4ee5\u8ba9\u591a\u70b9\u5bf9\u8c61\u81ea\u5df1\u6b7b\u6389\u800c\u4e0d\u7528\u590d\u5236\u4e86\u3002\u4f46Young\u589e\u5927\u65f6\uff0cGC\u9020\u6210\u7684\u505c\u987f\u65f6\u95f4\u6500\u5347\u5f97\u975e\u5e38\u6050\u6016\uff0c\u6bd4\u5982\u5728\u6211\u7684\u673a\u5668\u4e0a\uff0c\u9ed8\u8ba48M\u7684Young\uff0c\u53ea\u9700\u8981\u51e0\u6beb\u79d2\u7684\u65f6\u95f4\uff0c64M\u5c31\u5347\u523090\u6beb\u79d2\uff0c\u800c\u5347\u5230256M\u65f6\uff0c\u5c31\u8981\u5230300\u6beb\u79d2\u4e86\uff0c\u5cf0\u503c\u8fd8\u4f1a\u6500\u5230\u6050\u6016\u7684800ms\u3002\u8c01\u53eb\u590d\u5236\u7b97\u6cd5\uff0c\u8981\u7b49Young\u6ee1\u4e86\u624d\u5f00\u59cb\u6536\u96c6\uff0c\u5f00\u59cb\u6536\u96c6\u5c31\u8981\u505c\u6b62\u6240\u6709\u7ebf\u7a0b\u5462\u3002 <\/P> 3.3 \u6301\u4e45\u4ee3<\/STRONG> <\/P> \u53ef\u8bbe\u7f6e-XX:+CMSClassUnloadingEnabled 4.\u589e\u91cf(train\u7b97\u6cd5)\u6536\u96c6\u5668(Incremental Collector)<\/STRONG> <\/P> \u5df2\u505c\u6b62\u7ef4\u62a4\uff0c\u2013Xincgc\u9009\u9879\u9ed8\u8ba4\u8f6c\u4e3a\u5e76\u53d1\u6536\u96c6\u5668\u3002 <\/P> \u56db\u3001\u6682\u505c\u65f6\u95f4\u663e\u793a<\/STRONG> <\/P> \u52a0\u5165\u4e0b\u5217\u53c2\u6570 (\u8bf7\u5c06PrintGC\u548cDetails\u4e2d\u95f4\u7684\u7a7a\u683c\u53bb\u6389\uff0cCSDN\u5f88\u602a\u7684\u8ba4\u4e3a\u662f\u7981\u6b62\u5b57\u53e5\uff09 <\/P> \u4f1a\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u5c06\u663e\u793a\u5982\u4e0b\u8f93\u51fa <\/P> 9.211: [GC 9.211: [ParNew: 7994K->0K(8128K), 0.0123935 secs] 427172K->419977K(524224K), 0.0125728 secs] <\/P> \u663e\u793a\u5728\u7a0b\u5e8f\u8fd0\u884c\u76849.211\u79d2\u53d1\u751f\u4e86Minor\u7684\u5783\u573e\u6536\u96c6\uff0c\u524d\u4e00\u6bb5\u6570\u636e\u9488\u5bf9\u65b0\u751f\u533a\uff0c\u4ece7994k\u6574\u7406\u4e3a0k\uff0c\u65b0\u751f\u533a\u603b\u5927\u5c0f\u4e3a8128k\uff0c\u7a0b\u5e8f\u6682\u505c\u4e8612ms\uff0c\u800c\u540e\u4e00\u6bb5\u6570\u636e\u9488\u5bf9\u6574\u4e2a\u5806\u3002 <\/P> \u5bf9\u4e8e\u5e74\u8001\u4ee3\u7684\u6536\u96c6\uff0c\u6682\u505c\u53d1\u751f\u5728\u4e0b\u9762\u4e24\u4e2a\u9636\u6bb5\uff0cCMS-remark\u7684\u4e2d\u65ad\u662f17\u6beb\u79d2\uff1a <\/P> [GC [1 CMS-initial-mark: 80168K(196608K)] 81144K(261184K), 0.0059036 secs] <\/P> [1 CMS-remark: 80168K(196608K)] 82493K(261184K),0.0168943 secs] <\/P> \u518d\u52a0\u4e24\u4e2a\u53c2\u6570 -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime\u5bf9\u6682\u505c\u65f6\u95f4\u770b\u5f97\u66f4\u6e05\u6670\u3002 <\/P> \u4e94\u3001\u771f\u6b63\u4e0d\u505c\u7684BEA JRockit \u4e0eSun RTS2.0<\/STRONG> <\/P> Bea\u7684JRockit 5.0 R27<\/FONT><\/A> \u7684\u7279\u8272\u4e4b\u4e00\u662f\u52a8\u6001\u51b3\u5b9a\u7684\u5783\u573e\u6536\u96c6\u7b56\u7565\uff0c\u7528\u6237\u53ef\u4ee5\u51b3\u5b9a\u81ea\u5df1\u5173\u5fc3\u7684\u662f\u541e\u5410\u91cf\uff0c\u6682\u505c\u65f6\u95f4\u8fd8\u662f\u786e\u5b9a\u7684\u6682\u505c\u65f6\u95f4\uff0c\u518d\u7531JVM\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u51b3\u5b9a\u3001\u6539\u53d8\u6539\u53d8\u5783\u573e\u6536\u96c6\u7b56\u7565\u3002 \u6700\u53ef\u60dcJRockt\u7684license\u5f88\u5947\u602a\uff0c\u867d\u7136\u5e73\u65f6\u4f7f\u7528\u514d\u8d39\uff0c\u4f46\u8fd9\u4e2a30ms\u7684\u9009\u9879\u5c31\u9700\u8981\u8d2d\u4e70\u6574\u4e2aWeblogic Real Time Server\u7684license\u3002 <\/P> \u5176\u4ed6\u514d\u8d39\u9009\u9879\uff0c\u6709\uff1a<\/P> JavaOne2007\u4e0a\u6709Sun\u7684 Java Real-Time System 2.0<\/FONT><\/A> \u7684\u4ecb\u7ecd\uff0cRTS2.0\u57fa\u4e8eJDK1.5\uff0c\u5728Real-Time Garbage Collctor\u4e0a\u53c8\u6709\u6539\u8fdb\uff0c\u4f46\u8fd8\u5728beta\u7248\u72b6\u6001\uff0c\u53ea\u4f9b\u7ed9OEM\uff0c\u66f4\u602a\u3002 <\/P> \u516d\u3001JDK 6.0\u7684\u6539\u8fdb<\/STRONG> <\/P> \u56e0\u4e3aJDK5.0\u5728Young\u8f83\u5927\u65f6\u7684\u8868\u73b0\u8fd8\u662f\u4e0d\u591f\u8ba9\u4eba\u6ee1\u610f\uff0c\u53c8\u7ee7\u7eed\u770bJDK6.0\u7684\u6539\u8fdb\uff0c\u7ed3\u679c\u7a0d\u7a0d\u5931\u671b\uff0c\u4e0d\u6d89\u53ca\u6211\u6700\u5934\u75db\u7684\u5e74\u8f7b\u4ee3\u590d\u5236\u6536\u96c6\u6539\u826f\u3002 <\/P> 1.\u5e74\u8001\u4ee3\u7684\u6807\u8bc6-\u6e05\u9664\u6536\u96c6\uff0c\u5e76\u884c\u6267\u884c\u6807\u8bc6<\/STRONG> 2.\u52a0\u5927\u4e86Young\u533a\u7684\u9ed8\u8ba4\u5927\u5c0f<\/STRONG> 3.System.gc()\u53ef\u4ee5\u4e0e\u5e94\u7528\u7a0b\u5e8f\u5e76\u53d1\u6267\u884c<\/STRONG> \u4e03\u3001\u5c0f\u7ed3<\/STRONG> <\/P> 1. JDK5.0\/6.0<\/STRONG><\/P> \u5bf9\u4e8e\u670d\u52a1\u5668\u5e94\u7528\uff0c\u6211\u4eec\u4f7f\u7528Concurrent Low Pause Collector\uff0c\u5bf9\u5e74\u8f7b\u4ee3\uff0c\u6682\u505c\u65f6\u591a\u7ebf\u7a0b\u5e76\u884c\u590d\u5236\u6536\u96c6\uff1b\u5bf9\u5e74\u8001\u4ee3\uff0c\u6536\u96c6\u5668\u4e0e\u5e94\u7528\u7a0b\u5e8f\u5e76\u884c\u6807\u8bb0–\u6574\u7406\u6536\u96c6\uff0c\u4ee5\u8fbe\u5230\u5c3d\u91cf\u77ed\u7684\u5783\u573e\u6536\u96c6\u65f6\u95f4\u3002 <\/P> \u672c\u7740\u6ca1\u6709\u6df1\u523b\u6d4b\u8bd5\u524d\u4e0d\u8981\u80e1\u4e71\u4f18\u5316\u7684\u5b97\u65e8\uff0c\u547d\u4ee4\u884c\u5c5e\u6027\u53ea\u9700\u7b80\u5355\u5199\u4e3a\uff1a <\/P> \u7136\u540e\u8981\u6839\u636e\u5e94\u7528\u7684\u60c5\u51b5\uff0c\u5728\u6d4b\u8bd5\u8f6f\u4ef6\u8f85\u52a9\u53ef\u4ee5\u4e0b\u770b\u770b\u6709\u6ca1\u6709JVM\u7684\u9ed8\u8ba4\u503c\u548c\u81ea\u52a8\u7ba1\u7406\u505a\u7684\u4e0d\u591f\u7684\u5730\u65b9\u53ef\u4ee5\u8c03\u6574\uff0c\u5982-xmn \u8bbeYoung\u7684\u5927\u5c0f\uff0c-XX:MaxPermSize\u8bbe\u6301\u4e45\u4ee3\u5927\u5c0f\u7b49\u3002 <\/P> 2. JRockit 6.0 R27.2<\/STRONG><\/P> \u4f46\u56e0\u4e3aJDK5\u7684\u6d4b\u8bd5\u7ed3\u679c\u5b9e\u5728\u4e0d\u80fd\u6ee1\u610f\uff0c\u540e\u6765\u53c8\u5c1d\u8bd5\u4e86JRockit\uff0c\u603b\u4f53\u6548\u679c\u8981\u597d\u4e9b\u3002 \u4f5c\u8005\uff1a\u6c5f\u5357\u767d\u8863\uff0c\u6700\u65b0\u7248\u94fe\u63a5\uff1ahttp:\/\/blog.csdn.net\/calvinxiu\/archive\/2007\/05\/18\/1614473.aspx\uff0c\u7248\u6743\u6240\u6709\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u6587\u94fe\u63a5\u3002 \u539f\u672c\u60f3\u628a\u9898\u76ee\u66f4\u7b80\u5355\u7684\u5b9a\u4e3a–\u300a\u4e0d\u8981\u505c\u300b\u7684\uff0c\u4f46\u8fd8\u662f\u81ea\u5df1YY\u4e00\u4e0b\u5c31\u7b97\u4e86\u3002 Java\u5f00\u53d1Server\u6700\u5927\u7684\u969c\u788d\uff0c\u5c31\u662fJDK1.4\u7248\u4e4b\u524d\u7684\u7684\u4e32\u884c\u5783\u573e\u6536\u96c6\u673a\u5236\u4f1a\u5f15\u8d77\u957f\u65f6\u95f4\u7684\u670d\u52a1\u6682\u505c\uff0c\u660e\u767d\u539f\u7406\u540e\uff0c\u60f3\u60f3\u90a3\u4e9b\u7528JDK1.3\u5199Server\u7684\u5148\u8f88\uff0c\u4e0d\u5f97\u4e0d\u540e\u6015\u3002 \u597d\u5728JDK1.4\u5df2\u5f00\u59cb\u652f\u6301\u591a\u7ebf\u7a0b\u5e76\u884c\u7684\u540e\u53f0\u5783\u573e\u6536\u96c6\u7b97\u6cd5\uff0cJDK5.0\u5219\u4f18\u5316\u4e86\u9ed8\u8ba4\u503c\u7684\u8bbe\u7f6e\u3002 \u4e00\u3001\u53c2\u8003\u8d44\u6599\uff1a Tuning Garbage Collection with the 5.0 Java Virtual Machine \u5b98\u65b9\u6307\u5357\u3002 Hotspot memory management whitepaper \u5b98\u65b9\u767d\u76ae\u4e66\u3002 Java Tuning White Paper \u5b98\u65b9\u6587\u6863\u3002 FAQ about Garbage Collection in the Hotspot \u5b98\u65b9FAQ\uff0cJVM1.4.2\u3002 Java HotSpot \u865a\u62df\u673a\u4e2d\u7684\u5783\u573e\u6536\u96c6 JavaOne2004\u4e0a\u7684\u4e2d\u6587ppt A Collection of JVM Options JVM\u9009\u9879\u7684\u8d85\u5b8c\u6574\u6536\u96c6\u3002 \u4e8c\u3001\u57fa\u672c\u6982\u5ff5 1\u3001\u5806(Heap) JVM\u7ba1\u7406\u7684\u5185\u5b58\u53eb\u5806\u3002\u572832Bit\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u67091.5G-2G\u7684\u9650\u5236\uff0c\u800c64Bit\u7684\u5c31\u6ca1\u6709\u3002 JVM\u521d\u59cb\u5206\u914d\u7684\u5185\u5b58\u7531-Xms\u6307\u5b9a\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/64\u4f46\u5c0f\u4e8e1G\u3002 JVM\u6700\u5927\u5206\u914d\u7684\u5185\u5b58\u7531-Xmx\u6307\u5b9a\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/4\u4f46\u5c0f\u4e8e1G\u3002 \u9ed8\u8ba4\u7a7a\u4f59\u5806\u5185\u5b58\u5c0f\u4e8e40%\u65f6\uff0cJVM\u5c31\u4f1a\u589e\u5927\u5806\u76f4\u5230-Xmx\u7684\u6700\u5927\u9650\u5236\uff0c\u53ef\u4ee5\u7531-XX:MinHeapFreeRatio=\u6307\u5b9a\u3002 \u9ed8\u8ba4\u7a7a\u4f59\u5806\u5185\u5b58\u5927\u4e8e70%\u65f6\uff0cJVM\u4f1a\u51cf\u5c11\u5806\u76f4\u5230-Xms\u7684\u6700\u5c0f\u9650\u5236\uff0c\u53ef\u4ee5\u7531-XX:MaxHeapFreeRatio=\u6307\u5b9a\u3002 \u670d\u52a1\u5668\u4e00\u822c\u8bbe\u7f6e-Xms\u3001-Xmx\u76f8\u7b49\u4ee5\u907f\u514d\u5728\u6bcf\u6b21GC \u540e\u8c03\u6574\u5806\u7684\u5927\u5c0f\uff0c\u6240\u4ee5\u4e0a\u9762\u7684\u4e24\u4e2a\u53c2\u6570\u6ca1\u5565\u7528\u3002 2.\u57fa\u672c\u6536\u96c6\u7b97\u6cd5 \u590d\u5236\uff1a\u5c06\u5806\u5185\u5206\u6210\u4e24\u4e2a\u76f8\u540c\u7a7a\u95f4\uff0c\u4ece\u6839(ThreadLocal\u7684\u5bf9\u8c61\uff0c\u9759\u6001\u5bf9\u8c61\uff09\u5f00\u59cb\u8bbf\u95ee\u6bcf\u4e00\u4e2a\u5173\u8054\u7684\u6d3b\u8dc3\u5bf9\u8c61\uff0c\u5c06\u7a7a\u95f4A\u7684\u6d3b\u8dc3\u5bf9\u8c61\u5168\u90e8\u590d\u5236\u5230\u7a7a\u95f4B\uff0c\u7136\u540e\u4e00\u6b21\u6027\u56de\u6536\u6574\u4e2a\u7a7a\u95f4A\u3002\u56e0\u4e3a\u53ea\u8bbf\u95ee\u6d3b\u8dc3\u5bf9\u8c61\uff0c\u5c06\u6240\u6709\u6d3b\u52a8\u5bf9\u8c61\u590d\u5236\u8d70\u4e4b\u540e\u5c31\u6e05\u7a7a\u6574\u4e2a\u7a7a\u95f4\uff0c\u4e0d\u7528\u53bb\u8bbf\u95ee\u6b7b\u5bf9\u8c61\uff0c\u6240\u4ee5\u904d\u5386\u7a7a\u95f4\u7684\u6210\u672c\u8f83\u5c0f\uff0c\u4f46\u9700\u8981\u5de8\u5927\u7684\u590d\u5236\u6210\u672c\u548c\u8f83\u591a\u7684\u5185\u5b58\u3002 \u6807\u8bb0\u6e05\u9664(mark-sweep)\uff1a\u6536\u96c6\u5668\u5148\u4ece\u6839\u5f00\u59cb\u8bbf\u95ee\u6240\u6709\u6d3b\u8dc3\u5bf9\u8c61\uff0c\u6807\u8bb0\u4e3a\u6d3b\u8dc3\u5bf9\u8c61\u3002\u7136\u540e\u518d\u904d\u5386\u4e00\u6b21\u6574\u4e2a\u5185\u5b58\u533a\u57df\uff0c\u628a\u6240\u6709\u6ca1\u6709\u6807\u8bb0\u6d3b\u8dc3\u7684\u5bf9\u8c61\u8fdb\u884c\u56de\u6536\u5904\u7406\u3002\u8be5\u7b97\u6cd5\u904d\u5386\u6574\u4e2a\u7a7a\u95f4\u7684\u6210\u672c\u8f83\u5927\u6682\u505c\u65f6\u95f4\u968f\u7a7a\u95f4\u5927\u5c0f\u7ebf\u6027\u589e\u5927\uff0c\u800c\u4e14\u6574\u7406\u540e\u5806\u91cc\u7684\u788e\u7247\u5f88\u591a\u3002 \u6807\u8bb0\u6574\u7406(mark-sweep-compact)\uff1a\u7efc\u5408\u4e86\u4e0a\u8ff0\u4e24\u8005\u7684\u505a\u6cd5\u548c\u4f18\u70b9\uff0c\u5148\u6807\u8bb0\u6d3b\u8dc3\u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u5176\u5408\u5e76\u6210\u8f83\u5927\u7684\u5185\u5b58\u5757\u3002 \u53ef\u89c1\uff0c\u6ca1\u6709\u514d\u8d39\u7684\u5348\u9910\uff0c\u65e0\u8bba\u91c7\u7528\u590d\u5236\u8fd8\u662f\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\uff0c\u81ea\u52a8\u7684\u4e1c\u897f\u90fd\u8981\u4ed8\u51fa\u5f88\u5927\u7684\u6027\u80fd\u4ee3\u4ef7\u3002 … Continue reading JDK5.0\u5783\u573e\u6536\u96c6\u4f18\u5316\u4e4b–Don’t Pause<\/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],"tags":[85],"class_list":["post-506","post","type-post","status-publish","format-standard","hentry","category-java","tag-85"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/506","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=506"}],"version-history":[{"count":1,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/506\/revisions"}],"predecessor-version":[{"id":861,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/506\/revisions\/861"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Java\u5f00\u53d1Server\u6700\u5927\u7684\u969c\u788d\uff0c\u5c31\u662fJDK1.4\u7248\u4e4b\u524d\u7684\u7684\u4e32\u884c\u5783\u573e\u6536\u96c6\u673a\u5236\u4f1a\u5f15\u8d77\u957f\u65f6\u95f4\u7684\u670d\u52a1\u6682\u505c\uff0c\u660e\u767d\u539f\u7406\u540e\uff0c\u60f3\u60f3\u90a3\u4e9b\u7528JDK1.3\u5199Server\u7684\u5148\u8f88\uff0c\u4e0d\u5f97\u4e0d\u540e\u6015\u3002
\u597d\u5728JDK1.4\u5df2\u5f00\u59cb\u652f\u6301\u591a\u7ebf\u7a0b\u5e76\u884c\u7684\u540e\u53f0\u5783\u573e\u6536\u96c6\u7b97\u6cd5\uff0cJDK5.0\u5219\u4f18\u5316\u4e86\u9ed8\u8ba4\u503c\u7684\u8bbe\u7f6e\u3002 <\/P>
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\u9ed8\u8ba4\u7a7a\u4f59\u5806\u5185\u5b58\u5927\u4e8e70%\u65f6\uff0cJVM\u4f1a\u51cf\u5c11\u5806\u76f4\u5230-Xms\u7684\u6700\u5c0f\u9650\u5236\uff0c\u53ef\u4ee5\u7531-XX:MaxHeapFreeRatio=\u6307\u5b9a\u3002 <\/P>
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\u56e0\u4e3a\u53ea\u8bbf\u95ee\u6d3b\u8dc3\u5bf9\u8c61\uff0c\u5c06\u6240\u6709\u6d3b\u52a8\u5bf9\u8c61\u590d\u5236\u8d70\u4e4b\u540e\u5c31\u6e05\u7a7a\u6574\u4e2a\u7a7a\u95f4\uff0c\u4e0d\u7528\u53bb\u8bbf\u95ee\u6b7b\u5bf9\u8c61\uff0c\u6240\u4ee5\u904d\u5386\u7a7a\u95f4\u7684\u6210\u672c\u8f83\u5c0f\uff0c\u4f46\u9700\u8981\u5de8\u5927\u7684\u590d\u5236\u6210\u672c\u548c\u8f83\u591a\u7684\u5185\u5b58\u3002
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\u590d\u5236\u7b97\u6cd5\u4f18\u70b9\u662f\u53ea\u8bbf\u95ee\u6d3b\u8dc3\u5bf9\u8c61\uff0c\u7f3a\u70b9\u662f\u590d\u5236\u6210\u672c\u9ad8\u3002\u56e0\u4e3a\u5e74\u8f7b\u4ee3\u53ea\u6709\u5c11\u91cf\u7684\u5bf9\u8c61\u80fd\u71ac\u5230\u5783\u573e\u6536\u96c6\uff0c\u56e0\u6b64\u53ea\u9700\u5c11\u91cf\u7684\u590d\u5236\u6210\u672c\u3002\u800c\u4e14\u590d\u5236\u6536\u96c6\u5668\u53ea\u8bbf\u95ee\u6d3b\u8dc3\u5bf9\u8c61\uff0c\u5bf9\u90a3\u4e9b\u5360\u4e86\u6700\u5927\u6bd4\u7387\u7684\u6b7b\u5bf9\u8c61\u89c6\u800c\u4e0d\u89c1\uff0c\u5145\u5206\u53d1\u6325\u4e86\u5b83\u904d\u5386\u7a7a\u95f4\u6210\u672c\u4f4e\u7684\u4f18\u70b9\u3002 <\/P>
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-XX:NewRatio= \u53c2\u6570\u53ef\u4ee5\u8bbe\u7f6eYoung\u4e0eOld\u7684\u5927\u5c0f\u6bd4\u4f8b\uff0c-server\u65f6\u9ed8\u8ba4\u4e3a1:2\uff0c\u4f46\u5b9e\u9645\u4e0ayoung\u542f\u52a8\u65f6\u8fdc\u4f4e\u4e8e\u8fd9\u4e2a\u6bd4\u7387\uff1f\u5982\u679c\u4fe1\u4e0d\u8fc7JVM\uff0c\u4e5f\u53ef\u4ee5\u7528-Xmn\u786c\u6027\u89c4\u5b9a\u5176\u5927\u5c0f\uff0c\u6709\u6587\u6863\u63a8\u8350\u8bbe\u4e3aHeap\u603b\u5927\u5c0f\u76841\/4\u3002 <\/P>
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<\/STRONG>\u800c\u56e0\u4e3a\u6210\u672c\u5173\u7cfb\u5bf9Old\u7684\u68c0\u67e5\u56de\u6536\u9891\u7387\u8981\u4f4e\u5f88\u591a\uff0c\u540c\u65f6\u5bf9Young\u548cOld\u7684\u6536\u96c6\u79f0\u4e3amajor collection\u3002
System.gc()\u4f1a\u5f15\u53d1major collection\uff0c\u4f7f\u7528-XX:+DisableExplicitGC\u7981\u6b62\u5b83\uff0c\u6216\u8bbe\u4e3aCMS\u5e76\u53d1-XX:+ExplicitGCInvokesConcurrent\u3002 <\/P>
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1.\u5e74\u8f7b\u4ee3\u6682\u505c\u5e94\u7528\u7a0b\u5e8f\uff0c\u591a\u4e2a\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u5e76\u884c\u7684\u590d\u5236\u6536\u96c6\uff0c\u7ebf\u7a0b\u6570\u9ed8\u8ba4\u4e3aCPU\u4e2a\u6570\uff0cCPU\u5f88\u591a\u65f6\uff0c\u53ef\u7528\u2013XX:ParallelGCThreads=\u51cf\u5c11\u7ebf\u7a0b\u6570\u3002
2.\u5e74\u8001\u4ee3\u6682\u505c\u5e94\u7528\u7a0b\u5e8f\uff0c\u4e0e\u4e32\u884c\u6536\u96c6\u5668\u4e00\u6837\uff0c\u5355\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u6807\u8bb0\u6574\u7406\u3002 <\/P>
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1.\u5e74\u8f7b\u4ee3\u540c\u6837\u662f\u6682\u505c\u5e94\u7528\u7a0b\u5e8f\uff0c\u591a\u4e2a\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u5e76\u884c\u7684\u590d\u5236\u6536\u96c6\u3002
2.\u5e74\u8001\u4ee3\u5219\u53ea\u6709\u4e24\u6b21\u77ed\u6682\u505c\uff0c\u5176\u4ed6\u65f6\u95f4\u5e94\u7528\u7a0b\u5e8f\u4e0e\u6536\u96c6\u7ebf\u7a0b\u5e76\u53d1\u7684\u6e05\u9664\u3002 <\/P>
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\n-XX:+CMSPermGenSweepingEnabled\uff0c\u4f7fCMS\u6536\u96c6\u6301\u4e45\u4ee3\u7684\u7c7b\uff0c\u800c\u4e0d\u662ffullgc\uff0cnetbeans5.5 performance\u6587\u6863\u7684\u63a8\u8350\u3002<\/CODE> <\/P>
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\n![\"\"](\"http:\/\/images.csdn.net\/syntaxhighlighting\/OutliningIndicators\/None.gif\")
-verbose:gc -XX:+PrintGC Details -XX:+PrintGCTimeStamps <\/P>
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\u5b83\u7684Deterministic GC\u7684\u9009\u9879\u662f-Xgcprio: deterministic\uff0c\u53f7\u79f0\u53ef\u4ee5\u628a\u6682\u505c\u53ef\u4ee5\u63a7\u5236\u572810-30\u6beb\u79d2\uff0c\u975e\u5e38\u7684\u725b\uff0c\u4e00\u53e5Deterministic\u9053\u5c3d\u4e86RealTime\u7684\u771f\u8c1b\u3002 \u4e0d\u8fc7\u7ec6\u770b\u4e00\u4e0b\u6587\u6863\uff0c30ms\u7684\u6d4b\u8bd5\u73af\u5883\u662f1 GB heap \u548c \u5e73\u5747 30% \u7684\u6d3b\u8dc3\u5bf9\u8c61(\u4e5f\u5c31\u662f300M)\u6d3b\u52a8\u5bf9\u8c61\uff0c2 \u4e2a Xeon 3.6 GHz 4G\u5185\u5b58 \uff0c\u6216\u8005\u662f4 \u4e2aXeon 2.0 GHz\uff0c8G\u5185\u5b58\u3002 <\/P>
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\u56e0\u4e3a\u514d\u8d39\uff0c\u6240\u4ee5\u6700\u4f4e\u53ea\u80fd\u8bbe\u7f6e\u5230200ms pause target\u3002 200ms\u662fSun\u8ba4\u4e3aReal-Time\u7684\u5206\u754c\u7ebf\u3002
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\u666e\u901a\u7684\u5e76\u53d1\u505a\u6cd5\uff0c\u6548\u7387\u4e5f\u4e0d\u9519\u3002 <\/LI><\/UL>
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JDK5.0\u53ea\u5f00\u4e86\u4e00\u6761\u6536\u96c6\u8fdb\u7a0b\u4e0e\u5e94\u7528\u7ebf\u7a0b\u5e76\u53d1\u6807\u8bc6\uff0c\u800c6.0\u53ef\u4ee5\u5f00\u591a\u6761\u6536\u96c6\u7ebf\u7a0b\u6765\u505a\u6807\u8bc6\uff0c\u7f29\u77ed\u6807\u8bc6\u8001\u4eba\u533a\u6240\u6709\u6d3b\u52a8\u5bf9\u8c61\u7684\u65f6\u95f4\u3002 <\/P>
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\u9ed8\u8ba4\u5927\u5c0f\u4ece4M\u52a0\u523016M\uff0c\u4ece\u5806\u5185\u5b58\u76841\/15\u589e\u52a0\u52301\/7 <\/P>
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\u4f7f\u7528-XX:+ExplicitGCInvokesConcurrent \u8bbe\u7f6e<\/P>
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\n-server -Xms
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JRockit\u7684\u7279\u70b9\u662f\u52a8\u6001\u5783\u573e\u6536\u96c6\u5668\u662f\u6839\u636e\u7528\u6237\u5173\u5fc3\u7684\u7279\u5f81\u52a8\u6001\u51b3\u5b9a\u6536\u96c6\u7b97\u6cd5\u7684\uff0c\u53c2\u6570\u5982\u4e0b<\/P>
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\n -Xms
<\/DIV><\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"