{"id":32,"date":"2017-04-19T17:36:08","date_gmt":"2017-04-19T09:36:08","guid":{"rendered":"http:\/\/www.myway5.com\/?p=32"},"modified":"2017-04-19T18:14:22","modified_gmt":"2017-04-19T10:14:22","slug":"jvm-study-lesson-8","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2017\/04\/19\/jvm-study-lesson-8\/","title":{"rendered":"Java\u865a\u62df\u673a\u5b66\u4e60\u8bb0\u5f55(\u516b) \u2014\u2014 \u865a\u62df\u673a\u6027\u80fd\u76d1\u63a7\u4e0e\u6545\u969c\u5904\u7406\u5de5\u5177"},"content":{"rendered":"<h2>\u4e00\u3001\u524d\u8a00<\/h2>\n<p>\u6211\u89c9\u5f97Java\u7684\u5f3a\u5927\u4e4b\u5904\u5728\u4e8e\u5b83\u6709\u975e\u5e38\u5b8c\u5584\u7684\u751f\u6001\u73af\u5883\uff0c\u4ece\u5f00\u53d1\u5de5\u5177\u5230\u5206\u6790\u5904\u7406\u5de5\u5177\u3002\u4f7f\u7528JDK\u4e2d\u63d0\u4f9b\u7684\u5de5\u5177\u53ef\u4ee5\u5728\u9047\u5230\u7a0b\u5e8f\u6545\u969c\u65f6\u5feb\u901f\u5b9a\u4f4d\u6545\u969c\u53d1\u751f\u7684\u539f\u56e0\u5e76\u8fdb\u884c\u8c03\u4f18\u3002<\/p>\n<h2>\u4e8c\u3001JDK\u547d\u4ee4\u884c\u5de5\u5177<\/h2>\n<h3>a\u3001jps(JVM Process Status):\u865a\u62df\u673a\u8fdb\u7a0b\u72b6\u51b5\u5de5\u5177<\/h3>\n<p>jps\u53ef\u4ee5\u7528\u6765\u5217\u51fa\u6b63\u5728\u8fd0\u884c\u7684\u865a\u62df\u673a\u8fdb\u7a0b\uff0c\u5e76\u663e\u793a\u865a\u62df\u673a\u6267\u884c\u4e3b\u7c7b\uff08Main class,main\u51fd\u6570\u6240\u5728\u7684\u7c7b)\u540d\u79f0\u4ee5\u53ca\u8fd9\u4e9b\u8fdb\u7a0b\u7684\u672c\u5730\u865a\u62df\u673a\u552f\u4e00ID(Local Virtual Machine Identifier,LVMID)\u3002<\/p>\n<blockquote><p>\n  jps\u547d\u4ee4\u683c\u5f0f:<br \/>\n   jps [option] [hostid]<br \/>\n   \u4f7f\u7528\u8303\u4f8b:<br \/>\n   jiang@jiang-HP-ENVY-Notebook:~$ jps -l<br \/>\n  6084 \/home\/jiang\/eclipse\/\/plugins\/org.eclipse.equinox.launcher_1.3.200.v20160318-1642.jar<br \/>\n  6152 sun.tools.jps.Jps<br \/>\n  jps\u53ef\u4ee5\u901a\u8fc7RMI\u534f\u8bae\u67e5\u8be2\u5f00\u542f\u4e86RMI\u670d\u52a1\u7684\u8fdc\u7a0b\u865a\u62df\u673a\u8fdb\u7a0b\u72b6\u6001\uff0chostid\u4e3aRMI\u6ce8\u518c\u8868\u4e2d\u6ce8\u518c\u7684\u4e3b\u673a\u540d\u3002\n<\/p><\/blockquote>\n<table>\n<thead>\n<tr>\n<th>\u9009\u9879<\/th>\n<th>\u4f5c\u7528<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>-q<\/td>\n<td>\u53ea\u8f93\u51faLVMID,\u7701\u7565\u4e3b\u7c7b\u7684\u540d\u79f0<\/td>\n<\/tr>\n<tr>\n<td>-m<\/td>\n<td>\u8f93\u51fa\u865a\u62df\u673a\u8fdb\u7a0b\u542f\u52a8\u65f6\u4f20\u9012\u7ed9\u4e3b\u7c7bmain()\u51fd\u6570\u7684\u53c2\u6570<\/td>\n<\/tr>\n<tr>\n<td>-l<\/td>\n<td>\u8f93\u51fa\u4e3b\u7c7b\u7684\u5168\u540d\uff0c\u5982\u679c\u8fdb\u7a0b\u6267\u884c\u7684\u662fJar\u5305\uff0c\u8f93\u51faJar\u8def\u5f84<\/td>\n<\/tr>\n<tr>\n<td>-v<\/td>\n<td>\u8f93\u51fa\u865a\u62df\u673a\u8fdb\u7a0b\u542f\u52a8\u65f6JVM\u53c2\u6570<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>b\u3001jstat(JVM Statistics Monitoring Tool): \u865a\u62df\u673a\u7edf\u8ba1\u4fe1\u606f\u76d1\u89c6\u5de5\u5177<\/h3>\n<p>jstat\u662f\u7528\u4e8e\u76d1\u89c6\u865a\u62df\u673a\u5404\u79cd\u8fd0\u884c\u72b6\u6001\u4fe1\u606f\u7684\u547d\u4ee4\u884c\u5de5\u5177\u3002\u5b83\u53ef\u4ee5\u663e\u793a\u672c\u5730\u6216\u8005\u8fdc\u7a0b\u865a\u62df\u673a\u8fdb\u7a0b\u4e2d\u7684\u7c7b\u52a0\u8f7d\u3001\u5185\u5b58\u3001\u5783\u573e\u6536\u96c6\u3001JIT\u7f16\u8bd1\u7b49\u8fd0\u884c\u6570\u636e\u3002<\/p>\n<blockquote><p>\n  jstat\u547d\u4ee4\u683c\u5f0f\u4e3a:<br \/>\n   jstat [option vmid [interval [s|ms] [count]] ]<br \/>\n   \u5982\u679cVMID\u662f\u672c\u5730\u8fdb\u7a0b\uff0c\u548cLVMID\u662f\u4e00\u6837\u7684\uff0c\u5982\u679c\u662f\u8fdc\u7a0b\u865a\u62df\u673a\u8fdb\u7a0b\uff0c\u90a3VMID\u7684\u683c\u5f0f\u662f:<br \/>\n   [protocol:][\/\/]lvmid[@hostname[:port]\/servername]<br \/>\n   \u53c2\u6570inerval\u548ccount\u4ee3\u8868\u67e5\u8be2\u95f4\u9694\u548c\u6b21\u6570\uff0c\u5982\u679c\u7701\u7565\u5219\u8868\u793a\u53ea\u67e5\u8be2\u4e00\u6b21\u3002<br \/>\n   \u4f7f\u7528\u8303\u4f8b:<br \/>\n   jstat -gc 2764 250 20<br \/>\n   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