{"id":481,"date":"2008-02-15T00:00:00","date_gmt":"2008-02-14T16:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=481"},"modified":"2011-07-15T09:42:25","modified_gmt":"2011-07-15T01:42:25","slug":"jvm%e8%b0%83%e4%bc%98%e6%80%bb%e7%bb%93-xms-xmx-xmn-xss","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=481","title":{"rendered":"JVM\u8c03\u4f18\u603b\u7ed3 -Xms -Xmx -Xmn -Xss"},"content":{"rendered":"<p><SPAN style=\"FONT-SIZE: x-small\"><STRONG><FONT size=1>\u4e09\u3001\u5e38\u89c1\u914d\u7f6e\u4e3e\u4f8b<\/FONT><\/STRONG><\/SPAN><br \/>\n<OL><br \/>\n<LI><STRONG>\u5806\u5927\u5c0f\u8bbe\u7f6e<BR><\/STRONG>JVM \u4e2d\u6700\u5927\u5806\u5927\u5c0f\u6709\u4e09\u65b9\u9762\u9650\u5236\uff1a\u76f8\u5173\u64cd\u4f5c\u7cfb\u7edf\u7684\u6570\u636e\u6a21\u578b\uff0832-bt\u8fd8\u662f64-bit\uff09\u9650\u5236\uff1b\u7cfb\u7edf\u7684\u53ef\u7528\u865a\u62df\u5185\u5b58\u9650\u5236\uff1b\u7cfb\u7edf\u7684\u53ef\u7528\u7269\u7406\u5185\u5b58\u9650\u5236\u300232\u4f4d\u7cfb\u7edf\u4e0b\uff0c\u4e00\u822c\u9650\u5236\u57281.5G~2G\uff1b64\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u5185\u5b58\u65e0\u9650\u5236\u3002\u6211\u5728Windows Server 2003 \u7cfb\u7edf\uff0c3.5G\u7269\u7406\u5185\u5b58\uff0cJDK5.0\u4e0b\u6d4b\u8bd5\uff0c\u6700\u5927\u53ef\u8bbe\u7f6e\u4e3a1478m\u3002<BR><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">\u5178\u578b\u8bbe\u7f6e\uff1a<\/SPAN><\/STRONG><br \/>\n<UL><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java <STRONG>-Xmx3550m -Xms3550m -Xmn2g<\/STRONG> <\/SPAN><SPAN style=\"FONT-FAMILY: Courier New\"><STRONG>-Xss128k<\/STRONG><BR><STRONG>&#8211;<\/STRONG><\/SPAN><SPAN style=\"FONT-FAMILY: Courier New\"><STRONG>Xmx3550m<\/STRONG>\uff1a\u8bbe\u7f6eJVM\u6700\u5927\u53ef\u7528\u5185\u5b58\u4e3a3550M\u3002<BR><STRONG>-Xms3550m<\/STRONG><\/SPAN><SPAN style=\"FONT-FAMILY: Courier New\">\uff1a\u8bbe\u7f6eJVM\u4fc3\u4f7f\u5185\u5b58\u4e3a3550m\u3002\u6b64\u503c\u53ef\u4ee5\u8bbe\u7f6e\u4e0e-Xmx\u76f8\u540c\uff0c\u4ee5\u907f\u514d\u6bcf\u6b21\u5783\u573e\u56de\u6536\u5b8c\u6210\u540eJVM\u91cd\u65b0\u5206\u914d\u5185\u5b58\u3002<BR><STRONG><SPAN style=\"COLOR: #ff0000\">-Xmn2g<\/SPAN><\/STRONG><\/SPAN><SPAN style=\"FONT-FAMILY: Courier New\">\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u5927\u5c0f\u4e3a2G\u3002<STRONG><SPAN style=\"COLOR: #0000ff\">\u6574\u4e2a\u5806\u5927\u5c0f=\u5e74\u8f7b\u4ee3\u5927\u5c0f + \u5e74\u8001\u4ee3\u5927\u5c0f + \u6301\u4e45\u4ee3\u5927\u5c0f<\/SPAN><\/STRONG>\u3002\u6301\u4e45\u4ee3\u4e00\u822c\u56fa\u5b9a\u5927\u5c0f\u4e3a64m\uff0c\u6240\u4ee5\u589e\u5927\u5e74\u8f7b\u4ee3\u540e\uff0c\u5c06\u4f1a\u51cf\u5c0f\u5e74\u8001\u4ee3\u5927\u5c0f\u3002\u6b64\u503c\u5bf9\u7cfb\u7edf\u6027\u80fd\u5f71\u54cd\u8f83\u5927\uff0cSun\u5b98\u65b9\u63a8\u8350\u914d\u7f6e\u4e3a\u6574\u4e2a\u5806\u76843\/8\u3002<BR><STRONG>-Xss128k<\/STRONG><\/SPAN><SPAN style=\"FONT-FAMILY: Courier New\">\uff1a\u8bbe\u7f6e\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u5806\u6808\u5927\u5c0f\u3002JDK5.0\u4ee5\u540e\u6bcf\u4e2a\u7ebf\u7a0b\u5806\u6808\u5927\u5c0f\u4e3a1M\uff0c\u4ee5\u524d\u6bcf\u4e2a\u7ebf\u7a0b\u5806\u6808\u5927\u5c0f\u4e3a256K\u3002\u66f4\u5177\u5e94\u7528\u7684\u7ebf\u7a0b\u6240\u9700\u5185\u5b58\u5927\u5c0f\u8fdb\u884c\u8c03\u6574\u3002\u5728\u76f8\u540c\u7269\u7406\u5185\u5b58\u4e0b\uff0c\u51cf\u5c0f\u8fd9\u4e2a\u503c\u80fd\u751f\u6210\u66f4\u591a\u7684\u7ebf\u7a0b\u3002\u4f46\u662f\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u4e00\u4e2a\u8fdb\u7a0b\u5185\u7684\u7ebf\u7a0b\u6570\u8fd8\u662f\u6709\u9650\u5236\u7684\uff0c\u4e0d\u80fd\u65e0\u9650\u751f\u6210\uff0c\u7ecf\u9a8c\u503c\u57283000~5000\u5de6\u53f3\u3002<BR><\/SPAN><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java -Xmx3550m -Xms3550m -Xss128k <STRONG>-XX:NewRatio=4 -XX:SurvivorRatio=4 -XX:MaxPermSize=16m -XX:MaxTenuringThreshold=0<\/STRONG><BR><STRONG>-XX:NewRatio=4<\/STRONG><\/SPAN><SPAN style=\"FONT-FAMILY: Courier New\">:\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\u4e3a4\uff0c\u5219\u5e74\u8f7b\u4ee3\u4e0e\u5e74\u8001\u4ee3\u6240\u5360\u6bd4\u503c\u4e3a1\uff1a4\uff0c\u5e74\u8f7b\u4ee3\u5360\u6574\u4e2a\u5806\u6808\u76841\/5<BR><STRONG>-XX:SurvivorRatio=4<\/STRONG><\/SPAN>\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u4e2dEden\u533a\u4e0eSurvivor\u533a\u7684\u5927\u5c0f\u6bd4\u503c\u3002\u8bbe\u7f6e\u4e3a4\uff0c\u5219\u4e24\u4e2aSurvivor\u533a\u4e0e\u4e00\u4e2aEden\u533a\u7684\u6bd4\u503c\u4e3a2:4\uff0c\u4e00\u4e2aSurvivor\u533a\u5360\u6574\u4e2a\u5e74\u8f7b\u4ee3\u76841\/6<BR><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:MaxPermSize=16m<\/SPAN><\/STRONG>:\u8bbe\u7f6e\u6301\u4e45\u4ee3\u5927\u5c0f\u4e3a16m\u3002<BR><SPAN style=\"FONT-FAMILY: Courier New\"><STRONG>-XX:MaxTenuringThreshold=0<\/STRONG>\uff1a\u8bbe\u7f6e\u5783\u573e\u6700\u5927\u5e74\u9f84\u3002<STRONG><SPAN style=\"COLOR: #0000ff\">\u5982\u679c\u8bbe\u7f6e\u4e3a0\u7684\u8bdd\uff0c\u5219\u5e74\u8f7b\u4ee3\u5bf9\u8c61\u4e0d\u7ecf\u8fc7Survivor\u533a\uff0c\u76f4\u63a5\u8fdb\u5165\u5e74\u8001\u4ee3<\/SPAN><\/STRONG>\u3002\u5bf9\u4e8e\u5e74\u8001\u4ee3\u6bd4\u8f83\u591a\u7684\u5e94\u7528\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u3002<STRONG><SPAN style=\"COLOR: #0000ff\">\u5982\u679c\u5c06\u6b64\u503c\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u8f83\u5927\u503c\uff0c\u5219\u5e74\u8f7b\u4ee3\u5bf9\u8c61\u4f1a\u5728Survivor\u533a\u8fdb\u884c\u591a\u6b21\u590d\u5236\uff0c\u8fd9\u6837\u53ef\u4ee5\u589e\u52a0\u5bf9\u8c61\u518d\u5e74\u8f7b\u4ee3\u7684\u5b58\u6d3b\u65f6\u95f4<\/SPAN><\/STRONG>\uff0c\u589e\u52a0\u5728\u5e74\u8f7b\u4ee3\u5373\u88ab\u56de\u6536\u7684\u6982\u8bba\u3002<\/SPAN><\/LI><\/UL><br \/>\n<LI><STRONG>\u56de\u6536\u5668\u9009\u62e9<BR><\/STRONG>JVM\u7ed9\u4e86\u4e09\u79cd\u9009\u62e9\uff1a<STRONG>\u4e32\u884c\u6536\u96c6\u5668\u3001\u5e76\u884c\u6536\u96c6\u5668\u3001\u5e76\u53d1\u6536\u96c6\u5668<\/STRONG>\uff0c\u4f46\u662f\u4e32\u884c\u6536\u96c6\u5668\u53ea\u9002\u7528\u4e8e\u5c0f\u6570\u636e\u91cf\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u8fd9\u91cc\u7684\u9009\u62e9\u4e3b\u8981\u9488\u5bf9\u5e76\u884c\u6536\u96c6\u5668\u548c\u5e76\u53d1\u6536\u96c6\u5668\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cJDK5.0\u4ee5\u524d\u90fd\u662f\u4f7f\u7528\u4e32\u884c\u6536\u96c6\u5668\uff0c\u5982\u679c\u60f3\u4f7f\u7528\u5176\u4ed6\u6536\u96c6\u5668\u9700\u8981\u5728\u542f\u52a8\u65f6\u52a0\u5165\u76f8\u5e94\u53c2\u6570\u3002JDK5.0\u4ee5\u540e\uff0cJVM\u4f1a\u6839\u636e\u5f53\u524d<A href=\"http:\/\/java.sun.com\/j2se\/1.5.0\/docs\/guide\/vm\/server-class.html\">\u7cfb\u7edf\u914d\u7f6e<\/A>\u8fdb\u884c\u5224\u65ad\u3002<br \/>\n<OL><br \/>\n<LI><STRONG>\u541e\u5410\u91cf\u4f18\u5148<\/STRONG>\u7684\u5e76\u884c\u6536\u96c6\u5668<BR>\u5982\u4e0a\u6587\u6240\u8ff0\uff0c\u5e76\u884c\u6536\u96c6\u5668\u4e3b\u8981\u4ee5\u5230\u8fbe\u4e00\u5b9a\u7684\u541e\u5410\u91cf\u4e3a\u76ee\u6807\uff0c\u9002\u7528\u4e8e\u79d1\u5b66\u6280\u672f\u548c\u540e\u53f0\u5904\u7406\u7b49\u3002<BR><STRONG>\u5178\u578b\u914d\u7f6e<\/STRONG>\uff1a<br \/>\n<UL><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java -Xmx3800m -Xms3800m -Xmn2g -Xss128k <STRONG>-XX:+UseParallelGC -XX:ParallelGCThreads=20<\/STRONG><BR><STRONG>-XX:+UseParallelGC<\/STRONG><\/SPAN><SPAN style=\"FONT-FAMILY: Courier New\">\uff1a\u9009\u62e9\u5783\u573e\u6536\u96c6\u5668\u4e3a\u5e76\u884c\u6536\u96c6\u5668\u3002<\/SPAN><STRONG><SPAN style=\"COLOR: #0000ff; FONT-FAMILY: Courier New\">\u6b64\u914d\u7f6e\u4ec5\u5bf9\u5e74\u8f7b\u4ee3\u6709\u6548\u3002\u5373\u4e0a\u8ff0\u914d\u7f6e\u4e0b\uff0c\u5e74\u8f7b\u4ee3\u4f7f\u7528\u5e76\u53d1\u6536\u96c6\uff0c\u800c\u5e74\u8001\u4ee3\u4ecd\u65e7\u4f7f\u7528\u4e32\u884c\u6536\u96c6\u3002<BR><\/SPAN><\/STRONG><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:ParallelGCThreads=20<\/SPAN><\/STRONG><SPAN style=\"FONT-FAMILY: Courier New\">\uff1a\u914d\u7f6e\u5e76\u884c\u6536\u96c6\u5668\u7684\u7ebf\u7a0b\u6570\uff0c\u5373\uff1a\u540c\u65f6\u591a\u5c11\u4e2a\u7ebf\u7a0b\u4e00\u8d77\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002\u6b64\u503c\u6700\u597d\u914d\u7f6e\u4e0e\u5904\u7406\u5668\u6570\u76ee\u76f8\u7b49\u3002<BR><\/SPAN><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC -XX:ParallelGCThreads=20 <\/SPAN><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:+UseParallelOldGC<BR><\/SPAN><\/STRONG><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:+UseParallelOldGC<\/SPAN><\/STRONG><SPAN style=\"FONT-FAMILY: Courier New\">\uff1a\u914d\u7f6e\u5e74\u8001\u4ee3\u5783\u573e\u6536\u96c6\u65b9\u5f0f\u4e3a\u5e76\u884c\u6536\u96c6\u3002JDK6.0\u652f\u6301\u5bf9\u5e74\u8001\u4ee3\u5e76\u884c\u6536\u96c6\u3002<BR><\/SPAN><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC&nbsp; <\/SPAN><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:MaxGCPauseMillis=100<BR><\/SPAN><\/STRONG><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:MaxGCPauseMillis=100<\/SPAN><\/STRONG><SPAN style=\"FONT-FAMILY: Courier New\"><STRONG>:<\/STRONG>\u8bbe\u7f6e\u6bcf\u6b21\u5e74\u8f7b\u4ee3\u5783\u573e\u56de\u6536\u7684\u6700\u957f\u65f6\u95f4\uff0c\u5982\u679c\u65e0\u6cd5\u6ee1\u8db3\u6b64\u65f6\u95f4\uff0cJVM\u4f1a\u81ea\u52a8\u8c03\u6574\u5e74\u8f7b\u4ee3\u5927\u5c0f\uff0c\u4ee5\u6ee1\u8db3\u6b64\u503c\u3002<BR><\/SPAN><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC&nbsp; -XX:MaxGCPauseMillis=100 <\/SPAN><STRONG>-XX:+UseAdaptiveSizePolicy<BR>-XX:+UseAdaptiveSizePolicy<\/STRONG>\uff1a\u8bbe\u7f6e\u6b64\u9009\u9879\u540e\uff0c\u5e76\u884c\u6536\u96c6\u5668\u4f1a\u81ea\u52a8\u9009\u62e9\u5e74\u8f7b\u4ee3\u533a\u5927\u5c0f\u548c\u76f8\u5e94\u7684Survivor\u533a\u6bd4\u4f8b\uff0c\u4ee5\u8fbe\u5230\u76ee\u6807\u7cfb\u7edf\u89c4\u5b9a\u7684\u6700\u4f4e\u76f8\u5e94\u65f6\u95f4\u6216\u8005\u6536\u96c6\u9891\u7387\u7b49\uff0c\u6b64\u503c\u5efa\u8bae\u4f7f\u7528\u5e76\u884c\u6536\u96c6\u5668\u65f6\uff0c\u4e00\u76f4\u6253\u5f00\u3002<BR><\/LI><\/UL><br \/>\n<LI><STRONG>\u54cd\u5e94\u65f6\u95f4\u4f18\u5148<\/STRONG>\u7684\u5e76\u53d1\u6536\u96c6\u5668<BR>\u5982\u4e0a\u6587\u6240\u8ff0\uff0c\u5e76\u53d1\u6536\u96c6\u5668\u4e3b\u8981\u662f\u4fdd\u8bc1\u7cfb\u7edf\u7684\u54cd\u5e94\u65f6\u95f4\uff0c\u51cf\u5c11\u5783\u573e\u6536\u96c6\u65f6\u7684\u505c\u987f\u65f6\u95f4\u3002\u9002\u7528\u4e8e\u5e94\u7528\u670d\u52a1\u5668\u3001\u7535\u4fe1\u9886\u57df\u7b49\u3002<BR><STRONG>\u5178\u578b\u914d\u7f6e<\/STRONG>\uff1a<br \/>\n<UL><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:ParallelGCThreads=20 <\/SPAN><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:+UseConcMarkSweepGC -XX:+UseParNewGC<BR><\/SPAN><\/STRONG><SPAN style=\"FONT-FAMILY: Courier New\"><STRONG>-XX:+UseConcMarkSweepGC<\/STRONG>\uff1a\u8bbe\u7f6e\u5e74\u8001\u4ee3\u4e3a\u5e76\u53d1\u6536\u96c6\u3002\u6d4b\u8bd5\u4e2d\u914d\u7f6e\u8fd9\u4e2a\u4ee5\u540e\uff0c-XX:NewRatio=4\u7684\u914d\u7f6e\u5931\u6548\u4e86\uff0c\u539f\u56e0\u4e0d\u660e\u3002\u6240\u4ee5\uff0c\u6b64\u65f6\u5e74\u8f7b\u4ee3\u5927\u5c0f\u6700\u597d\u7528-Xmn\u8bbe\u7f6e\u3002<BR><STRONG>-XX:+UseParNewGC<\/STRONG>:\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u4e3a\u5e76\u884c\u6536\u96c6\u3002\u53ef\u4e0eCMS\u6536\u96c6\u540c\u65f6\u4f7f\u7528\u3002JDK5.0\u4ee5\u4e0a\uff0cJVM\u4f1a\u6839\u636e\u7cfb\u7edf\u914d\u7f6e\u81ea\u884c\u8bbe\u7f6e\uff0c\u6240\u4ee5\u65e0\u9700\u518d\u8bbe\u7f6e\u6b64\u503c\u3002<\/SPAN><br \/>\n<LI><SPAN style=\"FONT-FAMILY: Courier New\">java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseConcMarkSweepGC <\/SPAN><STRONG><SPAN style=\"FONT-FAMILY: Courier New\">-XX:CMSFullGCsBeforeCompaction=5 <\/SPAN>-XX:+UseCMSCompactAtFullCollection<\/STRONG><BR><SPAN style=\"FONT-FAMILY: Courier New\"><STRONG>-XX:CMSFullGCsBeforeCompaction<\/STRONG>\uff1a\u7531\u4e8e\u5e76\u53d1\u6536\u96c6\u5668\u4e0d\u5bf9\u5185\u5b58\u7a7a\u95f4\u8fdb\u884c\u538b\u7f29\u3001\u6574\u7406\uff0c\u6240\u4ee5\u8fd0\u884c\u4e00\u6bb5\u65f6\u95f4\u4ee5\u540e\u4f1a\u4ea7\u751f\u201c\u788e\u7247\u201d\uff0c\u4f7f\u5f97\u8fd0\u884c\u6548\u7387\u964d\u4f4e\u3002\u6b64\u503c\u8bbe\u7f6e\u8fd0\u884c\u591a\u5c11\u6b21GC\u4ee5\u540e\u5bf9\u5185\u5b58\u7a7a\u95f4\u8fdb\u884c\u538b\u7f29\u3001\u6574\u7406\u3002<BR><\/SPAN><STRONG>-XX:+UseCMSCompactAtFullCollection<\/STRONG>\uff1a\u6253\u5f00\u5bf9\u5e74\u8001\u4ee3\u7684\u538b\u7f29\u3002\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u4f46\u662f\u53ef\u4ee5\u6d88\u9664\u788e\u7247<BR><\/LI><\/UL><\/LI><\/OL><br \/>\n<LI><STRONG>\u8f85\u52a9\u4fe1\u606f<BR><\/STRONG>JVM\u63d0\u4f9b\u4e86\u5927\u91cf\u547d\u4ee4\u884c\u53c2\u6570\uff0c\u6253\u5370\u4fe1\u606f\uff0c\u4f9b\u8c03\u8bd5\u4f7f\u7528\u3002\u4e3b\u8981\u6709\u4ee5\u4e0b\u4e00\u4e9b\uff1a<br \/>\n<UL><br \/>\n<LI><STRONG>-XX:+PrintGC<BR><\/STRONG>\u8f93\u51fa\u5f62\u5f0f<STRONG>\uff1a[GC 118250K-&gt;113543K(130112K), 0.0094143 secs] <\/STRONG><br \/>\n<P><STRONG>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Full GC 121376K-&gt;10414K(130112K), 0.0650971 secs]<\/STRONG> <\/P><br \/>\n<LI><STRONG>-XX:+PrintGCDetails<BR><\/STRONG>\u8f93\u51fa\u5f62\u5f0f<STRONG>\uff1a[GC [DefNew: 8614K-&gt;781K(9088K), 0.0123035 secs] 118250K-&gt;113543K(130112K), 0.0124633 secs] <\/STRONG><br \/>\n<P><STRONG>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [GC [DefNew: 8614K-&gt;8614K(9088K), 0.0000665 secs][Tenured: 112761K-&gt;10414K(121024K), 0.0433488 secs] 121376K-&gt;10414K(130112K), 0.0436268 secs]<\/STRONG> <\/P><br \/>\n<LI><STRONG>-XX:+PrintGCTimeStamps<\/STRONG> -XX:+PrintGC\uff1aPrintGCTimeStamps\u53ef\u4e0e\u4e0a\u9762\u4e24\u4e2a\u6df7\u5408\u4f7f\u7528<BR>\u8f93\u51fa\u5f62\u5f0f\uff1a<STRONG>11.851: [GC 98328K-&gt;93620K(130112K), 0.0082960 secs]<BR><\/STRONG><br \/>\n<LI><STRONG>-XX:+PrintGCApplicationConcurrentTime:<\/STRONG>\u6253\u5370\u6bcf\u6b21\u5783\u573e\u56de\u6536\u524d\uff0c\u7a0b\u5e8f\u672a\u4e2d\u65ad\u7684\u6267\u884c\u65f6\u95f4\u3002\u53ef\u4e0e\u4e0a\u9762\u6df7\u5408\u4f7f\u7528<BR>\u8f93\u51fa\u5f62\u5f0f\uff1a<STRONG>Application time: 0.5291524 seconds<BR><\/STRONG><br \/>\n<LI><STRONG>-XX:+PrintGCApplicationStoppedTime<\/STRONG>\uff1a\u6253\u5370\u5783\u573e\u56de\u6536\u671f\u95f4\u7a0b\u5e8f\u6682\u505c\u7684\u65f6\u95f4\u3002\u53ef\u4e0e\u4e0a\u9762\u6df7\u5408\u4f7f\u7528<BR>\u8f93\u51fa\u5f62\u5f0f\uff1a<STRONG>Total time for which application threads were stopped: 0.0468229 seconds<BR><\/STRONG><br \/>\n<LI><STRONG>-XX:PrintHeapAtGC<\/STRONG>:\u6253\u5370GC\u524d\u540e\u7684\u8be6\u7ec6\u5806\u6808\u4fe1\u606f<BR>\u8f93\u51fa\u5f62\u5f0f\uff1a<BR>34.702: [GC {Heap before gc invocations=7:<BR>&nbsp;def new generation&nbsp;&nbsp; total 55296K, used 52568K [0x1ebd0000, 0x227d0000, 0x227d0000)<BR><STRONG>eden space 49152K,&nbsp; 99% used<\/STRONG> [0x1ebd0000, 0x21bce430, 0x21bd0000)<BR><STRONG>from space 6144K,&nbsp; 55% used<\/STRONG> [0x221d0000, 0x22527e10, 0x227d0000)<BR>&nbsp; to&nbsp;&nbsp; space 6144K,&nbsp;&nbsp; 0% used [0x21bd0000, 0x21bd0000, 0x221d0000)<BR>&nbsp;tenured generation&nbsp;&nbsp; total 69632K, used 2696K [0x227d0000, 0x26bd0000, 0x26bd0000)<BR><STRONG>the space 69632K,&nbsp;&nbsp; 3% used<\/STRONG> [0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000)<BR>&nbsp;compacting perm gen&nbsp; total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)<BR>&nbsp;&nbsp; the space 8192K,&nbsp; 35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)<BR>&nbsp;&nbsp;&nbsp; ro space 8192K,&nbsp; 66% used [0x2abd0000, 0x2b12bcc0, 0x2b12be00, 0x2b3d0000)<BR>&nbsp;&nbsp;&nbsp; rw space 12288K,&nbsp; 46% used [0x2b3d0000, 0x2b972060, 0x2b972200, 0x2bfd0000)<BR>34.735: [DefNew: 52568K-&gt;3433K(55296K), 0.0072126 secs] 55264K-&gt;6615K(124928K)<STRONG>Heap after gc invocations=8:<BR><\/STRONG>&nbsp;def new generation&nbsp;&nbsp; total 55296K, used 3433K [0x1ebd0000, 0x227d0000, 0x227d0000)<BR><STRONG>eden space 49152K,&nbsp;&nbsp; 0% used<\/STRONG> [0x1ebd0000, 0x1ebd0000, 0x21bd0000)<BR>&nbsp; from space 6144K,&nbsp; 55% used [0x21bd0000, 0x21f2a5e8, 0x221d0000)<BR>&nbsp; to&nbsp;&nbsp; space 6144K,&nbsp;&nbsp; 0% used [0x221d0000, 0x221d0000, 0x227d0000)<BR>&nbsp;tenured generation&nbsp;&nbsp; total 69632K, used 3182K [0x227d0000, 0x26bd0000, 0x26bd0000)<BR><STRONG>the space 69632K,&nbsp;&nbsp; 4% used <\/STRONG>[0x227d0000, 0x22aeb958, 0x22aeba00, 0x26bd0000)<BR>&nbsp;compacting perm gen&nbsp; total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)<BR>&nbsp;&nbsp; the space 8192K,&nbsp; 35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)<BR>&nbsp;&nbsp;&nbsp; ro space 8192K,&nbsp; 66% used [0x2abd0000, 0x2b12bcc0, 0x2b12be00, 0x2b3d0000)<BR>&nbsp;&nbsp;&nbsp; rw space 12288K,&nbsp; 46% used [0x2b3d0000, 0x2b972060, 0x2b972200, 0x2bfd0000)<BR>}<BR>, 0.0757599 secs]<BR><br \/>\n<LI><STRONG>-Xloggc:filename<\/STRONG>:\u4e0e\u4e0a\u9762\u51e0\u4e2a\u914d\u5408\u4f7f\u7528\uff0c\u628a\u76f8\u5173\u65e5\u5fd7\u4fe1\u606f\u8bb0\u5f55\u5230\u6587\u4ef6\u4ee5\u4fbf\u5206\u6790\u3002<\/LI><\/UL><br \/>\n<LI><STRONG>\u5e38\u89c1\u914d\u7f6e\u6c47\u603b<\/STRONG><br \/>\n<OL><br \/>\n<LI>\u5806\u8bbe\u7f6e<br \/>\n<UL><br \/>\n<LI><STRONG>-Xms<\/STRONG>:\u521d\u59cb\u5806\u5927\u5c0f<br \/>\n<LI><STRONG>-Xmx<\/STRONG>:\u6700\u5927\u5806\u5927\u5c0f<br \/>\n<LI><STRONG>-XX:NewSize=n<\/STRONG>:\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u5927\u5c0f<br \/>\n<LI><STRONG>-XX:NewRatio=n:<\/STRONG>\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u548c\u5e74\u8001\u4ee3\u7684\u6bd4\u503c\u3002\u5982:\u4e3a3\uff0c\u8868\u793a\u5e74\u8f7b\u4ee3\u4e0e\u5e74\u8001\u4ee3\u6bd4\u503c\u4e3a1\uff1a3\uff0c\u5e74\u8f7b\u4ee3\u5360\u6574\u4e2a\u5e74\u8f7b\u4ee3\u5e74\u8001\u4ee3\u548c\u76841\/4<br \/>\n<LI><STRONG>-XX:SurvivorRatio=n<\/STRONG>:\u5e74\u8f7b\u4ee3\u4e2dEden\u533a\u4e0e\u4e24\u4e2aSurvivor\u533a\u7684\u6bd4\u503c\u3002\u6ce8\u610fSurvivor\u533a\u6709\u4e24\u4e2a\u3002\u5982\uff1a3\uff0c\u8868\u793aEden\uff1aSurvivor=3\uff1a2\uff0c\u4e00\u4e2aSurvivor\u533a\u5360\u6574\u4e2a\u5e74\u8f7b\u4ee3\u76841\/5<br \/>\n<LI><STRONG>-XX:MaxPermSize=n<\/STRONG>:\u8bbe\u7f6e\u6301\u4e45\u4ee3\u5927\u5c0f<\/LI><\/UL><br \/>\n<LI>\u6536\u96c6\u5668\u8bbe\u7f6e<br \/>\n<UL><br \/>\n<LI><STRONG>-XX:+UseSerialGC<\/STRONG>:\u8bbe\u7f6e\u4e32\u884c\u6536\u96c6\u5668<br \/>\n<LI><STRONG>-XX:+UseParallelGC<\/STRONG>:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u5668<br \/>\n<LI><STRONG>-XX:+UseParalledlOldGC<\/STRONG>:\u8bbe\u7f6e\u5e76\u884c\u5e74\u8001\u4ee3\u6536\u96c6\u5668<br \/>\n<LI><STRONG>-XX:+UseConcMarkSweepGC<\/STRONG>:\u8bbe\u7f6e\u5e76\u53d1\u6536\u96c6\u5668<\/LI><\/UL><br \/>\n<LI>\u5783\u573e\u56de\u6536\u7edf\u8ba1\u4fe1\u606f<br \/>\n<UL><br \/>\n<LI><STRONG>-XX:+PrintGC<\/STRONG><br \/>\n<LI><STRONG>-XX:+PrintGCDetails<\/STRONG><br \/>\n<LI><STRONG>-XX:+PrintGCTimeStamps<\/STRONG><br \/>\n<LI><STRONG>-Xloggc:filename<\/STRONG><\/LI><\/UL><br \/>\n<LI>\u5e76\u884c\u6536\u96c6\u5668\u8bbe\u7f6e<br \/>\n<UL><br \/>\n<LI><STRONG>-XX:ParallelGCThreads=n<\/STRONG>:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u5668\u6536\u96c6\u65f6\u4f7f\u7528\u7684CPU\u6570\u3002\u5e76\u884c\u6536\u96c6\u7ebf\u7a0b\u6570\u3002<br \/>\n<LI><STRONG>-XX:MaxGCPauseMillis=n<\/STRONG>:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u6700\u5927\u6682\u505c\u65f6\u95f4<br \/>\n<LI><STRONG>-XX:GCTimeRatio=n<\/STRONG>:\u8bbe\u7f6e\u5783\u573e\u56de\u6536\u65f6\u95f4\u5360\u7a0b\u5e8f\u8fd0\u884c\u65f6\u95f4\u7684\u767e\u5206\u6bd4\u3002\u516c\u5f0f\u4e3a1\/(1+n)<\/LI><\/UL><br \/>\n<LI>\u5e76\u53d1\u6536\u96c6\u5668\u8bbe\u7f6e<br \/>\n<UL><br \/>\n<LI><STRONG>-XX:+CMSIncrementalMode<\/STRONG>:\u8bbe\u7f6e\u4e3a\u589e\u91cf\u6a21\u5f0f\u3002\u9002\u7528\u4e8e\u5355CPU\u60c5\u51b5\u3002<br \/>\n<LI><STRONG>-XX:ParallelGCThreads=n<\/STRONG>:\u8bbe\u7f6e\u5e76\u53d1\u6536\u96c6\u5668\u5e74\u8f7b\u4ee3\u6536\u96c6\u65b9\u5f0f\u4e3a\u5e76\u884c\u6536\u96c6\u65f6\uff0c\u4f7f\u7528\u7684CPU\u6570\u3002\u5e76\u884c\u6536\u96c6\u7ebf\u7a0b\u6570\u3002<\/LI><\/UL><\/LI><\/OL><\/LI><\/OL><BR><STRONG><SPAN style=\"FONT-SIZE: x-small\"><FONT size=1>\u56db\u3001\u8c03\u4f18\u603b\u7ed3<\/FONT><\/SPAN><\/STRONG><br \/>\n<OL><br \/>\n<LI><STRONG>\u5e74\u8f7b\u4ee3\u5927\u5c0f\u9009\u62e9<\/STRONG><br \/>\n<UL><br \/>\n<LI><STRONG>\u54cd\u5e94\u65f6\u95f4\u4f18\u5148\u7684\u5e94\u7528<\/STRONG>\uff1a<STRONG><SPAN style=\"COLOR: #0000ff\">\u5c3d\u53ef\u80fd\u8bbe\u5927\uff0c\u76f4\u5230\u63a5\u8fd1\u7cfb\u7edf\u7684\u6700\u4f4e\u54cd\u5e94\u65f6\u95f4\u9650\u5236<\/SPAN><\/STRONG>\uff08\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u9009\u62e9\uff09\u3002\u5728\u6b64\u79cd\u60c5\u51b5\u4e0b\uff0c\u5e74\u8f7b\u4ee3\u6536\u96c6\u53d1\u751f\u7684\u9891\u7387\u4e5f\u662f\u6700\u5c0f\u7684\u3002\u540c\u65f6\uff0c\u51cf\u5c11\u5230\u8fbe\u5e74\u8001\u4ee3\u7684\u5bf9\u8c61\u3002<br \/>\n<LI><STRONG>\u541e\u5410\u91cf\u4f18\u5148\u7684\u5e94\u7528<\/STRONG>\uff1a\u5c3d\u53ef\u80fd\u7684\u8bbe\u7f6e\u5927\uff0c\u53ef\u80fd\u5230\u8fbeGbit\u7684\u7a0b\u5ea6\u3002\u56e0\u4e3a\u5bf9\u54cd\u5e94\u65f6\u95f4\u6ca1\u6709\u8981\u6c42\uff0c\u5783\u573e\u6536\u96c6\u53ef\u4ee5\u5e76\u884c\u8fdb\u884c\uff0c\u4e00\u822c\u9002\u54088CPU\u4ee5\u4e0a\u7684\u5e94\u7528\u3002<\/LI><\/UL><br \/>\n<LI><STRONG>\u5e74\u8001\u4ee3\u5927\u5c0f\u9009\u62e9<\/STRONG><br \/>\n<UL><br \/>\n<LI><STRONG>\u54cd\u5e94\u65f6\u95f4\u4f18\u5148\u7684\u5e94\u7528<\/STRONG>\uff1a\u5e74\u8001\u4ee3\u4f7f\u7528\u5e76\u53d1\u6536\u96c6\u5668\uff0c\u6240\u4ee5\u5176\u5927\u5c0f\u9700\u8981\u5c0f\u5fc3\u8bbe\u7f6e\uff0c\u4e00\u822c\u8981\u8003\u8651<STRONG>\u5e76\u53d1\u4f1a\u8bdd\u7387<\/STRONG>\u548c<STRONG>\u4f1a\u8bdd\u6301\u7eed\u65f6\u95f4<\/STRONG>\u7b49\u4e00\u4e9b\u53c2\u6570\u3002\u5982\u679c\u5806\u8bbe\u7f6e\u5c0f\u4e86\uff0c\u53ef\u4ee5\u4f1a\u9020\u6210\u5185\u5b58\u788e\u7247\u3001\u9ad8\u56de\u6536\u9891\u7387\u4ee5\u53ca\u5e94\u7528\u6682\u505c\u800c\u4f7f\u7528\u4f20\u7edf\u7684\u6807\u8bb0\u6e05\u9664\u65b9\u5f0f\uff1b\u5982\u679c\u5806\u5927\u4e86\uff0c\u5219\u9700\u8981\u8f83\u957f\u7684\u6536\u96c6\u65f6\u95f4\u3002\u6700\u4f18\u5316\u7684\u65b9\u6848\uff0c\u4e00\u822c\u9700\u8981\u53c2\u8003\u4ee5\u4e0b\u6570\u636e\u83b7\u5f97\uff1a<br \/>\n<UL><br \/>\n<LI>\u5e76\u53d1\u5783\u573e\u6536\u96c6\u4fe1\u606f<br \/>\n<LI>\u6301\u4e45\u4ee3\u5e76\u53d1\u6536\u96c6\u6b21\u6570<br \/>\n<LI>\u4f20\u7edfGC\u4fe1\u606f<br \/>\n<LI>\u82b1\u5728\u5e74\u8f7b\u4ee3\u548c\u5e74\u8001\u4ee3\u56de\u6536\u4e0a\u7684\u65f6\u95f4\u6bd4\u4f8b<\/LI><\/UL>\u51cf\u5c11\u5e74\u8f7b\u4ee3\u548c\u5e74\u8001\u4ee3\u82b1\u8d39\u7684\u65f6\u95f4\uff0c\u4e00\u822c\u4f1a\u63d0\u9ad8\u5e94\u7528\u7684\u6548\u7387<BR><br \/>\n<LI><STRONG>\u541e\u5410\u91cf\u4f18\u5148\u7684\u5e94\u7528<\/STRONG>\uff1a\u4e00\u822c\u541e\u5410\u91cf\u4f18\u5148\u7684\u5e94\u7528\u90fd\u6709\u4e00\u4e2a\u5f88\u5927\u7684\u5e74\u8f7b\u4ee3\u548c\u4e00\u4e2a\u8f83\u5c0f\u7684\u5e74\u8001\u4ee3\u3002\u539f\u56e0\u662f\uff0c\u8fd9\u6837\u53ef\u4ee5\u5c3d\u53ef\u80fd\u56de\u6536\u6389\u5927\u90e8\u5206\u77ed\u671f\u5bf9\u8c61\uff0c\u51cf\u5c11\u4e2d\u671f\u7684\u5bf9\u8c61\uff0c\u800c\u5e74\u8001\u4ee3\u5c3d\u5b58\u653e\u957f\u671f\u5b58\u6d3b\u5bf9\u8c61\u3002<\/LI><\/UL><br \/>\n<LI><STRONG>\u8f83\u5c0f\u5806\u5f15\u8d77\u7684\u788e\u7247\u95ee\u9898<BR><\/STRONG>\u56e0\u4e3a\u5e74\u8001\u4ee3\u7684\u5e76\u53d1\u6536\u96c6\u5668\u4f7f\u7528\u6807\u8bb0\u3001\u6e05\u9664\u7b97\u6cd5\uff0c\u6240\u4ee5\u4e0d\u4f1a\u5bf9\u5806\u8fdb\u884c\u538b\u7f29\u3002\u5f53\u6536\u96c6\u5668\u56de\u6536\u65f6\uff0c\u4ed6\u4f1a\u628a\u76f8\u90bb\u7684\u7a7a\u95f4\u8fdb\u884c\u5408\u5e76\uff0c\u8fd9\u6837\u53ef\u4ee5\u5206\u914d\u7ed9\u8f83\u5927\u7684\u5bf9\u8c61\u3002\u4f46\u662f\uff0c\u5f53\u5806\u7a7a\u95f4\u8f83\u5c0f\u65f6\uff0c\u8fd0\u884c\u4e00\u6bb5\u65f6\u95f4\u4ee5\u540e\uff0c\u5c31\u4f1a\u51fa\u73b0\u201c\u788e\u7247\u201d\uff0c\u5982\u679c\u5e76\u53d1\u6536\u96c6\u5668\u627e\u4e0d\u5230\u8db3\u591f\u7684\u7a7a\u95f4\uff0c\u90a3\u4e48\u5e76\u53d1\u6536\u96c6\u5668\u5c06\u4f1a\u505c\u6b62\uff0c\u7136\u540e\u4f7f\u7528\u4f20\u7edf\u7684\u6807\u8bb0\u3001\u6e05\u9664\u65b9\u5f0f\u8fdb\u884c\u56de\u6536\u3002\u5982\u679c\u51fa\u73b0\u201c\u788e\u7247\u201d\uff0c\u53ef\u80fd\u9700\u8981\u8fdb\u884c\u5982\u4e0b\u914d\u7f6e\uff1a<br \/>\n<UL><br \/>\n<LI><STRONG>-XX:+UseCMSCompactAtFullCollection<\/STRONG>\uff1a\u4f7f\u7528\u5e76\u53d1\u6536\u96c6\u5668\u65f6\uff0c\u5f00\u542f\u5bf9\u5e74\u8001\u4ee3\u7684\u538b\u7f29\u3002<br \/>\n<LI><STRONG>-XX:CMSFullGCsBeforeCompaction=0<\/STRONG>\uff1a\u4e0a\u9762\u914d\u7f6e\u5f00\u542f\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd9\u91cc\u8bbe\u7f6e\u591a\u5c11\u6b21Full GC\u540e\uff0c\u5bf9\u5e74\u8001\u4ee3\u8fdb\u884c\u538b\u7f29<\/LI><\/UL><\/LI><\/OL><BR><STRONG><SPAN style=\"FONT-SIZE: x-small\"><FONT size=1>\u4e94\u3001\u53c2\u8003\u6587\u732e<\/FONT><\/SPAN><\/STRONG><br \/>\n<UL><br \/>\n<LI><A href=\"http:\/\/www.ibm.com\/developerworks\/cn\/java\/j-jtp10283\/\">Java \u7406\u8bba\u4e0e\u5b9e\u8df5: \u5783\u573e\u6536\u96c6\u7b80\u53f2<\/A><br \/>\n<LI><A href=\"http:\/\/java.sun.com\/javase\/technologies\/hotspot\/gc\/gc_tuning_6.html#resources\">Java SE 6 HotSpot[tm] Virtual Machine Garbage Collection Tuning<\/A><br \/>\n<LI><A href=\"http:\/\/developers.sun.com\/mobility\/midp\/articles\/garbagecollection2\/#16.2.6\">Improving Java Application Performance and Scalability by Reducing Garbage Collection Times and Sizing Memory Using JDK 1.4.1<\/A><br \/>\n<LI><A href=\"https:\/\/java.sun.com\/j2se\/reference\/whitepapers\/memorymanagement_whitepaper.pdf\">Hotspot memory management whitepaper<\/A><br \/>\n<LI><A href=\"http:\/\/java.sun.com\/performance\/reference\/whitepapers\/tuning.html\">Java Tuning White Paper<\/A><br \/>\n<LI><A href=\"http:\/\/java.sun.com\/docs\/hotspot\/gc1.4.2\/example.html\">Diagnosing a Garbage Collection problem<\/A><br \/>\n<LI><A href=\"http:\/\/java.sun.com\/javase\/technologies\/hotspot\/vmoptions.jsp\">Java HotSpot VM Options<\/A><br \/>\n<LI><A href=\"http:\/\/blogs.sun.com\/watt\/resource\/jvm-options-list.html\">A Collection of JVM Options<\/A><br \/>\n<LI><A href=\"http:\/\/java.sun.com\/docs\/hotspot\/gc1.4.2\/faq.html\">Frequently Asked Questions about Garbage Collection in the HotspotTM JavaTM Virtual Machine<\/A><\/LI><\/UL><br \/>\n<DIV><\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e09\u3001\u5e38\u89c1\u914d\u7f6e\u4e3e\u4f8b \u5806\u5927\u5c0f\u8bbe\u7f6eJVM \u4e2d\u6700\u5927\u5806\u5927\u5c0f\u6709\u4e09\u65b9\u9762\u9650\u5236\uff1a\u76f8\u5173\u64cd\u4f5c\u7cfb\u7edf\u7684\u6570\u636e\u6a21\u578b\uff0832-bt\u8fd8\u662f64-bit\uff09\u9650\u5236\uff1b\u7cfb\u7edf\u7684\u53ef\u7528\u865a\u62df\u5185\u5b58\u9650\u5236\uff1b\u7cfb\u7edf\u7684\u53ef\u7528\u7269\u7406\u5185\u5b58\u9650\u5236\u300232\u4f4d\u7cfb\u7edf\u4e0b\uff0c\u4e00\u822c\u9650\u5236\u57281.5G~2G\uff1b64\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u5185\u5b58\u65e0\u9650\u5236\u3002\u6211\u5728Windows Server 2003 \u7cfb\u7edf\uff0c3.5G\u7269\u7406\u5185\u5b58\uff0cJDK5.0\u4e0b\u6d4b\u8bd5\uff0c\u6700\u5927\u53ef\u8bbe\u7f6e\u4e3a1478m\u3002\u5178\u578b\u8bbe\u7f6e\uff1a java -Xmx3550m -Xms3550m -Xmn2g -Xss128k&#8211;Xmx3550m\uff1a\u8bbe\u7f6eJVM\u6700\u5927\u53ef\u7528\u5185\u5b58\u4e3a3550M\u3002-Xms3550m\uff1a\u8bbe\u7f6eJVM\u4fc3\u4f7f\u5185\u5b58\u4e3a3550m\u3002\u6b64\u503c\u53ef\u4ee5\u8bbe\u7f6e\u4e0e-Xmx\u76f8\u540c\uff0c\u4ee5\u907f\u514d\u6bcf\u6b21\u5783\u573e\u56de\u6536\u5b8c\u6210\u540eJVM\u91cd\u65b0\u5206\u914d\u5185\u5b58\u3002-Xmn2g\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u5927\u5c0f\u4e3a2G\u3002\u6574\u4e2a\u5806\u5927\u5c0f=\u5e74\u8f7b\u4ee3\u5927\u5c0f + \u5e74\u8001\u4ee3\u5927\u5c0f + \u6301\u4e45\u4ee3\u5927\u5c0f\u3002\u6301\u4e45\u4ee3\u4e00\u822c\u56fa\u5b9a\u5927\u5c0f\u4e3a64m\uff0c\u6240\u4ee5\u589e\u5927\u5e74\u8f7b\u4ee3\u540e\uff0c\u5c06\u4f1a\u51cf\u5c0f\u5e74\u8001\u4ee3\u5927\u5c0f\u3002\u6b64\u503c\u5bf9\u7cfb\u7edf\u6027\u80fd\u5f71\u54cd\u8f83\u5927\uff0cSun\u5b98\u65b9\u63a8\u8350\u914d\u7f6e\u4e3a\u6574\u4e2a\u5806\u76843\/8\u3002-Xss128k\uff1a\u8bbe\u7f6e\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u5806\u6808\u5927\u5c0f\u3002JDK5.0\u4ee5\u540e\u6bcf\u4e2a\u7ebf\u7a0b\u5806\u6808\u5927\u5c0f\u4e3a1M\uff0c\u4ee5\u524d\u6bcf\u4e2a\u7ebf\u7a0b\u5806\u6808\u5927\u5c0f\u4e3a256K\u3002\u66f4\u5177\u5e94\u7528\u7684\u7ebf\u7a0b\u6240\u9700\u5185\u5b58\u5927\u5c0f\u8fdb\u884c\u8c03\u6574\u3002\u5728\u76f8\u540c\u7269\u7406\u5185\u5b58\u4e0b\uff0c\u51cf\u5c0f\u8fd9\u4e2a\u503c\u80fd\u751f\u6210\u66f4\u591a\u7684\u7ebf\u7a0b\u3002\u4f46\u662f\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u4e00\u4e2a\u8fdb\u7a0b\u5185\u7684\u7ebf\u7a0b\u6570\u8fd8\u662f\u6709\u9650\u5236\u7684\uff0c\u4e0d\u80fd\u65e0\u9650\u751f\u6210\uff0c\u7ecf\u9a8c\u503c\u57283000~5000\u5de6\u53f3\u3002 java -Xmx3550m -Xms3550m -Xss128k -XX:NewRatio=4 -XX:SurvivorRatio=4 -XX:MaxPermSize=16m -XX:MaxTenuringThreshold=0-XX:NewRatio=4:\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\u4e3a4\uff0c\u5219\u5e74\u8f7b\u4ee3\u4e0e\u5e74\u8001\u4ee3\u6240\u5360\u6bd4\u503c\u4e3a1\uff1a4\uff0c\u5e74\u8f7b\u4ee3\u5360\u6574\u4e2a\u5806\u6808\u76841\/5-XX:SurvivorRatio=4\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u4e2dEden\u533a\u4e0eSurvivor\u533a\u7684\u5927\u5c0f\u6bd4\u503c\u3002\u8bbe\u7f6e\u4e3a4\uff0c\u5219\u4e24\u4e2aSurvivor\u533a\u4e0e\u4e00\u4e2aEden\u533a\u7684\u6bd4\u503c\u4e3a2:4\uff0c\u4e00\u4e2aSurvivor\u533a\u5360\u6574\u4e2a\u5e74\u8f7b\u4ee3\u76841\/6-XX:MaxPermSize=16m:\u8bbe\u7f6e\u6301\u4e45\u4ee3\u5927\u5c0f\u4e3a16m\u3002-XX:MaxTenuringThreshold=0\uff1a\u8bbe\u7f6e\u5783\u573e\u6700\u5927\u5e74\u9f84\u3002\u5982\u679c\u8bbe\u7f6e\u4e3a0\u7684\u8bdd\uff0c\u5219\u5e74\u8f7b\u4ee3\u5bf9\u8c61\u4e0d\u7ecf\u8fc7Survivor\u533a\uff0c\u76f4\u63a5\u8fdb\u5165\u5e74\u8001\u4ee3\u3002\u5bf9\u4e8e\u5e74\u8001\u4ee3\u6bd4\u8f83\u591a\u7684\u5e94\u7528\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u3002\u5982\u679c\u5c06\u6b64\u503c\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u8f83\u5927\u503c\uff0c\u5219\u5e74\u8f7b\u4ee3\u5bf9\u8c61\u4f1a\u5728Survivor\u533a\u8fdb\u884c\u591a\u6b21\u590d\u5236\uff0c\u8fd9\u6837\u53ef\u4ee5\u589e\u52a0\u5bf9\u8c61\u518d\u5e74\u8f7b\u4ee3\u7684\u5b58\u6d3b\u65f6\u95f4\uff0c\u589e\u52a0\u5728\u5e74\u8f7b\u4ee3\u5373\u88ab\u56de\u6536\u7684\u6982\u8bba\u3002 \u56de\u6536\u5668\u9009\u62e9JVM\u7ed9\u4e86\u4e09\u79cd\u9009\u62e9\uff1a\u4e32\u884c\u6536\u96c6\u5668\u3001\u5e76\u884c\u6536\u96c6\u5668\u3001\u5e76\u53d1\u6536\u96c6\u5668\uff0c\u4f46\u662f\u4e32\u884c\u6536\u96c6\u5668\u53ea\u9002\u7528\u4e8e\u5c0f\u6570\u636e\u91cf\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u8fd9\u91cc\u7684\u9009\u62e9\u4e3b\u8981\u9488\u5bf9\u5e76\u884c\u6536\u96c6\u5668\u548c\u5e76\u53d1\u6536\u96c6\u5668\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cJDK5.0\u4ee5\u524d\u90fd\u662f\u4f7f\u7528\u4e32\u884c\u6536\u96c6\u5668\uff0c\u5982\u679c\u60f3\u4f7f\u7528\u5176\u4ed6\u6536\u96c6\u5668\u9700\u8981\u5728\u542f\u52a8\u65f6\u52a0\u5165\u76f8\u5e94\u53c2\u6570\u3002JDK5.0\u4ee5\u540e\uff0cJVM\u4f1a\u6839\u636e\u5f53\u524d\u7cfb\u7edf\u914d\u7f6e\u8fdb\u884c\u5224\u65ad\u3002 \u541e\u5410\u91cf\u4f18\u5148\u7684\u5e76\u884c\u6536\u96c6\u5668\u5982\u4e0a\u6587\u6240\u8ff0\uff0c\u5e76\u884c\u6536\u96c6\u5668\u4e3b\u8981\u4ee5\u5230\u8fbe\u4e00\u5b9a\u7684\u541e\u5410\u91cf\u4e3a\u76ee\u6807\uff0c\u9002\u7528\u4e8e\u79d1\u5b66\u6280\u672f\u548c\u540e\u53f0\u5904\u7406\u7b49\u3002\u5178\u578b\u914d\u7f6e\uff1a java -Xmx3800m -Xms3800m -Xmn2g -Xss128k -XX:+UseParallelGC -XX:ParallelGCThreads=20-XX:+UseParallelGC\uff1a\u9009\u62e9\u5783\u573e\u6536\u96c6\u5668\u4e3a\u5e76\u884c\u6536\u96c6\u5668\u3002\u6b64\u914d\u7f6e\u4ec5\u5bf9\u5e74\u8f7b\u4ee3\u6709\u6548\u3002\u5373\u4e0a\u8ff0\u914d\u7f6e\u4e0b\uff0c\u5e74\u8f7b\u4ee3\u4f7f\u7528\u5e76\u53d1\u6536\u96c6\uff0c\u800c\u5e74\u8001\u4ee3\u4ecd\u65e7\u4f7f\u7528\u4e32\u884c\u6536\u96c6\u3002-XX:ParallelGCThreads=20\uff1a\u914d\u7f6e\u5e76\u884c\u6536\u96c6\u5668\u7684\u7ebf\u7a0b\u6570\uff0c\u5373\uff1a\u540c\u65f6\u591a\u5c11\u4e2a\u7ebf\u7a0b\u4e00\u8d77\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002\u6b64\u503c\u6700\u597d\u914d\u7f6e\u4e0e\u5904\u7406\u5668\u6570\u76ee\u76f8\u7b49\u3002 java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC -XX:ParallelGCThreads=20 -XX:+UseParallelOldGC-XX:+UseParallelOldGC\uff1a\u914d\u7f6e\u5e74\u8001\u4ee3\u5783\u573e\u6536\u96c6\u65b9\u5f0f\u4e3a\u5e76\u884c\u6536\u96c6\u3002JDK6.0\u652f\u6301\u5bf9\u5e74\u8001\u4ee3\u5e76\u884c\u6536\u96c6\u3002 java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC&nbsp; -XX:MaxGCPauseMillis=100-XX:MaxGCPauseMillis=100:\u8bbe\u7f6e\u6bcf\u6b21\u5e74\u8f7b\u4ee3\u5783\u573e\u56de\u6536\u7684\u6700\u957f\u65f6\u95f4\uff0c\u5982\u679c\u65e0\u6cd5\u6ee1\u8db3\u6b64\u65f6\u95f4\uff0cJVM\u4f1a\u81ea\u52a8\u8c03\u6574\u5e74\u8f7b\u4ee3\u5927\u5c0f\uff0c\u4ee5\u6ee1\u8db3\u6b64\u503c\u3002 java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC&nbsp; -XX:MaxGCPauseMillis=100 -XX:+UseAdaptiveSizePolicy-XX:+UseAdaptiveSizePolicy\uff1a\u8bbe\u7f6e\u6b64\u9009\u9879\u540e\uff0c\u5e76\u884c\u6536\u96c6\u5668\u4f1a\u81ea\u52a8\u9009\u62e9\u5e74\u8f7b\u4ee3\u533a\u5927\u5c0f\u548c\u76f8\u5e94\u7684Survivor\u533a\u6bd4\u4f8b\uff0c\u4ee5\u8fbe\u5230\u76ee\u6807\u7cfb\u7edf\u89c4\u5b9a\u7684\u6700\u4f4e\u76f8\u5e94\u65f6\u95f4\u6216\u8005\u6536\u96c6\u9891\u7387\u7b49\uff0c\u6b64\u503c\u5efa\u8bae\u4f7f\u7528\u5e76\u884c\u6536\u96c6\u5668\u65f6\uff0c\u4e00\u76f4\u6253\u5f00\u3002 &hellip; <a 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