{"id":3289,"date":"2018-03-22T09:13:45","date_gmt":"2018-03-22T01:13:45","guid":{"rendered":"http:\/\/switch.linesno.com\/?p=3289"},"modified":"2018-03-22T09:13:45","modified_gmt":"2018-03-22T01:13:45","slug":"m%e8%b0%83%e4%bc%98%e6%80%bb%e7%bb%93-xms-xmx-xmn-xss","status":"publish","type":"post","link":"http:\/\/switch.linesno.com\/?p=3289","title":{"rendered":"M\u8c03\u4f18\u603b\u7ed3 -Xms -Xmx -Xmn -Xss"},"content":{"rendered":"<div id=\"blog_content\" class=\"blog_content\">\n<ol>\n<li><strong>\u5806\u5927\u5c0f\u8bbe\u7f6e<br \/>\n<\/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 \/>\n<strong>\u5178\u578b\u8bbe\u7f6e\uff1a<\/strong><\/p>\n<ul>\n<li>java\u00a0<strong>-Xmx3550m -Xms3550m -Xmn2g<\/strong>\u00a0<strong>-Xss128k<\/strong><br \/>\n<strong>&#8211;<\/strong><strong>Xmx3550m<\/strong>\uff1a\u8bbe\u7f6eJVM\u6700\u5927\u53ef\u7528\u5185\u5b58\u4e3a3550M\u3002<br \/>\n<strong>-Xms3550m<\/strong>\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 \/>\n<strong>-Xmn2g<\/strong>\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u5927\u5c0f\u4e3a2G\u3002<strong>\u6574\u4e2aJVM\u5185\u5b58\u5927\u5c0f=\u5e74\u8f7b\u4ee3\u5927\u5c0f + \u5e74\u8001\u4ee3\u5927\u5c0f + \u6301\u4e45\u4ee3\u5927\u5c0f<\/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 \/>\n<strong>-Xss128k<\/strong>\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<\/li>\n<li>java -Xmx3550m -Xms3550m -Xss128k\u00a0<strong>-XX:NewRatio=4 -XX:SurvivorRatio=4 -XX:MaxPermSize=16m -XX:MaxTenuringThreshold=0<\/strong><br \/>\n<strong>-XX:NewRatio=4<\/strong>:\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 \/>\n<strong>-XX:SurvivorRatio=4<\/strong>\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 \/>\n<strong>-XX:MaxPermSize=16m<\/strong>:\u8bbe\u7f6e\u6301\u4e45\u4ee3\u5927\u5c0f\u4e3a16m\u3002<br \/>\n<strong>-XX:MaxTenuringThreshold=0<\/strong>\uff1a\u8bbe\u7f6e\u5783\u573e\u6700\u5927\u5e74\u9f84\u3002<strong>\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<\/strong>\u3002\u5bf9\u4e8e\u5e74\u8001\u4ee3\u6bd4\u8f83\u591a\u7684\u5e94\u7528\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u3002<strong>\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<\/strong>\uff0c\u589e\u52a0\u5728\u5e74\u8f7b\u4ee3\u5373\u88ab\u56de\u6536\u7684\u6982\u8bba\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u56de\u6536\u5668\u9009\u62e9<br \/>\n<\/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<\/p>\n<ol>\n<li><strong>\u541e\u5410\u91cf\u4f18\u5148<\/strong>\u7684\u5e76\u884c\u6536\u96c6\u5668<br \/>\n\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 \/>\n<strong>\u5178\u578b\u914d\u7f6e<\/strong>\uff1a<\/p>\n<ul>\n<li>java -Xmx3800m -Xms3800m -Xmn2g -Xss128k\u00a0<strong>-XX:+UseParallelGC -XX:ParallelGCThreads=20<\/strong><br \/>\n<strong>-XX:+UseParallelGC<\/strong>\uff1a\u9009\u62e9\u5783\u573e\u6536\u96c6\u5668\u4e3a\u5e76\u884c\u6536\u96c6\u5668\u3002<strong>\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 \/>\n<\/strong><strong>-XX:ParallelGCThreads=20<\/strong>\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<\/li>\n<li>java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC -XX:ParallelGCThreads=20\u00a0<strong>-XX:+UseParallelOldGC<br \/>\n<\/strong><strong>-XX:+UseParallelOldGC<\/strong>\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<\/li>\n<li>java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC\u00a0\u00a0<strong>-XX:MaxGCPauseMillis=100<br \/>\n<\/strong><strong>-XX:MaxGCPauseMillis=100<\/strong><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<\/li>\n<li>java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseParallelGC\u00a0 -XX:MaxGCPauseMillis=100\u00a0<strong>-XX:+UseAdaptiveSizePolicy<br \/>\n-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<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u54cd\u5e94\u65f6\u95f4\u4f18\u5148<\/strong>\u7684\u5e76\u53d1\u6536\u96c6\u5668<br \/>\n\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 \/>\n<strong>\u5178\u578b\u914d\u7f6e<\/strong>\uff1a<\/p>\n<ul>\n<li>java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:ParallelGCThreads=20\u00a0<strong>-XX:+UseConcMarkSweepGC -XX:+UseParNewGC<br \/>\n<\/strong><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 \/>\n<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<\/li>\n<li>java -Xmx3550m -Xms3550m -Xmn2g -Xss128k -XX:+UseConcMarkSweepGC\u00a0<strong>-XX:CMSFullGCsBeforeCompaction=5\u00a0-XX:+UseCMSCompactAtFullCollection<\/strong><br \/>\n<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 \/>\n<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<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n<li><strong>\u8f85\u52a9\u4fe1\u606f<br \/>\n<\/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<\/p>\n<ul>\n<li><strong>-XX:+PrintGC<br \/>\n<\/strong>\u8f93\u51fa\u5f62\u5f0f<strong>\uff1a[GC 118250K-&gt;113543K(130112K), 0.0094143 secs]<\/strong><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 [Full GC 121376K-&gt;10414K(130112K), 0.0650971 secs]<\/strong><\/li>\n<li><strong>-XX:+PrintGCDetails<br \/>\n<\/strong>\u8f93\u51fa\u5f62\u5f0f<strong>\uff1a[GC [DefNew: 8614K-&gt;781K(9088K), 0.0123035 secs] 118250K-&gt;113543K(130112K), 0.0124633 secs]<\/strong><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 [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><\/li>\n<li><strong>-XX:+PrintGCTimeStamps<\/strong>\u00a0-XX:+PrintGC\uff1aPrintGCTimeStamps\u53ef\u4e0e\u4e0a\u9762\u4e24\u4e2a\u6df7\u5408\u4f7f\u7528<br \/>\n\u8f93\u51fa\u5f62\u5f0f\uff1a<strong>11.851: [GC 98328K-&gt;93620K(130112K), 0.0082960 secs]<br \/>\n<\/strong><\/li>\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 \/>\n\u8f93\u51fa\u5f62\u5f0f\uff1a<strong>Application time: 0.5291524 seconds<br \/>\n<\/strong><\/li>\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 \/>\n\u8f93\u51fa\u5f62\u5f0f\uff1a<strong>Total time for which application threads were stopped: 0.0468229 seconds<br \/>\n<\/strong><\/li>\n<li><strong>-XX:PrintHeapAtGC<\/strong>:\u6253\u5370GC\u524d\u540e\u7684\u8be6\u7ec6\u5806\u6808\u4fe1\u606f<br \/>\n\u8f93\u51fa\u5f62\u5f0f\uff1a<br \/>\n34.702: [GC {Heap before gc invocations=7:<br \/>\ndef new generation\u00a0\u00a0 total 55296K, used 52568K [0x1ebd0000, 0x227d0000, 0x227d0000)<br \/>\n<strong>eden space 49152K,\u00a0 99% used<\/strong>\u00a0[0x1ebd0000, 0x21bce430, 0x21bd0000)<br \/>\n<strong>from space 6144K,\u00a0 55% used<\/strong>\u00a0[0x221d0000, 0x22527e10, 0x227d0000)<br \/>\nto\u00a0\u00a0 space 6144K,\u00a0\u00a0 0% used [0x21bd0000, 0x21bd0000, 0x221d0000)<br \/>\ntenured generation\u00a0\u00a0 total 69632K, used 2696K [0x227d0000, 0x26bd0000, 0x26bd0000)<br \/>\n<strong>the space 69632K,\u00a0\u00a0 3% used<\/strong>\u00a0[0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000)<br \/>\ncompacting perm gen\u00a0 total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)<br \/>\nthe space 8192K,\u00a0 35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)<br \/>\nro space 8192K,\u00a0 66% used [0x2abd0000, 0x2b12bcc0, 0x2b12be00, 0x2b3d0000)<br \/>\nrw space 12288K,\u00a0 46% used [0x2b3d0000, 0x2b972060, 0x2b972200, 0x2bfd0000)<br \/>\n34.735: [DefNew: 52568K-&gt;3433K(55296K), 0.0072126 secs] 55264K-&gt;6615K(124928K)<strong>Heap after gc invocations=8:<br \/>\n<\/strong>\u00a0def new generation\u00a0\u00a0 total 55296K, used 3433K [0x1ebd0000, 0x227d0000, 0x227d0000)<br \/>\n<strong>eden space 49152K,\u00a0\u00a0 0% used<\/strong>\u00a0[0x1ebd0000, 0x1ebd0000, 0x21bd0000)<br \/>\nfrom space 6144K,\u00a0 55% used [0x21bd0000, 0x21f2a5e8, 0x221d0000)<br \/>\nto\u00a0\u00a0 space 6144K,\u00a0\u00a0 0% used [0x221d0000, 0x221d0000, 0x227d0000)<br \/>\ntenured generation\u00a0\u00a0 total 69632K, used 3182K [0x227d0000, 0x26bd0000, 0x26bd0000)<br \/>\n<strong>the space 69632K,\u00a0\u00a0 4% used\u00a0<\/strong>[0x227d0000, 0x22aeb958, 0x22aeba00, 0x26bd0000)<br \/>\ncompacting perm gen\u00a0 total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)<br \/>\nthe space 8192K,\u00a0 35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)<br \/>\nro space 8192K,\u00a0 66% used [0x2abd0000, 0x2b12bcc0, 0x2b12be00, 0x2b3d0000)<br \/>\nrw space 12288K,\u00a0 46% used [0x2b3d0000, 0x2b972060, 0x2b972200, 0x2bfd0000)<br \/>\n}<br \/>\n, 0.0757599 secs]<\/li>\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>\n<\/ul>\n<\/li>\n<li><strong>\u5e38\u89c1\u914d\u7f6e\u6c47\u603b<\/strong>\n<ol>\n<li>\u5806\u8bbe\u7f6e\n<ul>\n<li><strong>-Xms<\/strong>:\u521d\u59cb\u5806\u5927\u5c0f<\/li>\n<li><strong>-Xmx<\/strong>:\u6700\u5927\u5806\u5927\u5c0f<\/li>\n<li><strong>-XX:NewSize=n<\/strong>:\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u5927\u5c0f<\/li>\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<\/li>\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<\/li>\n<li><strong>-XX:MaxPermSize=n<\/strong>:\u8bbe\u7f6e\u6301\u4e45\u4ee3\u5927\u5c0f<\/li>\n<\/ul>\n<\/li>\n<li>\u6536\u96c6\u5668\u8bbe\u7f6e\n<ul>\n<li><strong>-XX:+UseSerialGC<\/strong>:\u8bbe\u7f6e\u4e32\u884c\u6536\u96c6\u5668<\/li>\n<li><strong>-XX:+UseParallelGC<\/strong>:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u5668<\/li>\n<li><strong>-XX:+UseParalledlOldGC<\/strong>:\u8bbe\u7f6e\u5e76\u884c\u5e74\u8001\u4ee3\u6536\u96c6\u5668<\/li>\n<li><strong>-XX:+UseConcMarkSweepGC<\/strong>:\u8bbe\u7f6e\u5e76\u53d1\u6536\u96c6\u5668<\/li>\n<\/ul>\n<\/li>\n<li>\u5783\u573e\u56de\u6536\u7edf\u8ba1\u4fe1\u606f\n<ul>\n<li><strong>-XX:+PrintGC<\/strong><\/li>\n<li><strong>-XX:+PrintGCDetails<\/strong><\/li>\n<li><strong>-XX:+PrintGCTimeStamps<\/strong><\/li>\n<li><strong>-Xloggc:filename<\/strong><\/li>\n<\/ul>\n<\/li>\n<li>\u5e76\u884c\u6536\u96c6\u5668\u8bbe\u7f6e\n<ul>\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<\/li>\n<li><strong>-XX:MaxGCPauseMillis=n<\/strong>:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u6700\u5927\u6682\u505c\u65f6\u95f4<\/li>\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>\n<\/ul>\n<\/li>\n<li>\u5e76\u53d1\u6536\u96c6\u5668\u8bbe\u7f6e\n<ul>\n<li><strong>-XX:+CMSIncrementalMode<\/strong>:\u8bbe\u7f6e\u4e3a\u589e\u91cf\u6a21\u5f0f\u3002\u9002\u7528\u4e8e\u5355CPU\u60c5\u51b5\u3002<\/li>\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>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><strong>\u56db\u3001\u8c03\u4f18\u603b\u7ed3<\/strong><\/p>\n<ol>\n<li><strong>\u5e74\u8f7b\u4ee3\u5927\u5c0f\u9009\u62e9<\/strong>\n<ul>\n<li><strong>\u54cd\u5e94\u65f6\u95f4\u4f18\u5148\u7684\u5e94\u7528<\/strong>\uff1a<strong>\u5c3d\u53ef\u80fd\u8bbe\u5927\uff0c\u76f4\u5230\u63a5\u8fd1\u7cfb\u7edf\u7684\u6700\u4f4e\u54cd\u5e94\u65f6\u95f4\u9650\u5236<\/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<\/li>\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>\n<\/ul>\n<\/li>\n<li><strong>\u5e74\u8001\u4ee3\u5927\u5c0f\u9009\u62e9<\/strong>\n<ul>\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\n<ul>\n<li>\u5e76\u53d1\u5783\u573e\u6536\u96c6\u4fe1\u606f<\/li>\n<li>\u6301\u4e45\u4ee3\u5e76\u53d1\u6536\u96c6\u6b21\u6570<\/li>\n<li>\u4f20\u7edfGC\u4fe1\u606f<\/li>\n<li>\u82b1\u5728\u5e74\u8f7b\u4ee3\u548c\u5e74\u8001\u4ee3\u56de\u6536\u4e0a\u7684\u65f6\u95f4\u6bd4\u4f8b<\/li>\n<\/ul>\n<p>\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<\/li>\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>\n<\/ul>\n<\/li>\n<li><strong>\u8f83\u5c0f\u5806\u5f15\u8d77\u7684\u788e\u7247\u95ee\u9898<br \/>\n<\/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<\/p>\n<ul>\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<\/li>\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>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n<div>\n<div id=\"_9tsuecd1jyv\"><\/div>\n<\/div>\n<div id=\"bottoms\" class=\"clearfix\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5806\u5927\u5c0f\u8bbe\u7f6e 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 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87],"tags":[],"class_list":["post-3289","post","type-post","status-publish","format-standard","hentry","category-editor"],"_links":{"self":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts\/3289","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3289"}],"version-history":[{"count":1,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts\/3289\/revisions"}],"predecessor-version":[{"id":3290,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts\/3289\/revisions\/3290"}],"wp:attachment":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3289"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3289"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}