{"id":5112,"date":"2020-10-08T10:00:46","date_gmt":"2020-10-08T02:00:46","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5112"},"modified":"2020-10-08T10:00:46","modified_gmt":"2020-10-08T02:00:46","slug":"tomcat-%e7%9a%84%e8%b0%83%e4%bc%98%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5112","title":{"rendered":"Tomcat \u7684\u8c03\u4f18\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u9762\u8bd5\u5b98\uff1aTomcat \u7684\u8c03\u4f18\u600e\u4e48\u505a\uff1f\u4f60\u7684\u6700\u4f73\u5b9e\u8df5\u6709\u54ea\u4e9b\uff1f<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u524d\u8a00<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tomcat\u4f5c\u4e3aWeb\u5e94\u7528\u7684\u670d\u52a1\u5668\uff0c\u76ee\u524d\u7edd\u5927\u591a\u6570\u516c\u53f8\u90fd\u662f\u7528\u5176\u4f5c\u4e3a\u5e94\u7528\u670d\u52a1\u5668\u7684\uff0c\u5e94\u7528\u670d\u52a1\u5668\u7684\u6267\u884c\u6548\u7387\u4f1a\u5f71\u54cd\u7cfb\u7edf\u6267\u884c\uff0c\u8fd9\u91cc\u4f1a\u8bb2Tomcat\u600e\u6837\u8fdb\u884c\u914d\u7f6e\u80fd\u63d0\u9ad8\u5904\u7406\u6027\u80fd\u3002\u53e6\u5916\u5fc5\u987b\u63d0\u5230\u5bf9\u5e94\u7684JVM\u53c2\u6570\u7684\u4f18\u5316\u7684\u4e00\u4e9b\u7ecf\u9a8c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tomcat\u8fd0\u884c\u6a21\u5f0f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5206\u4e09\u79cd\u6a21\u5f0f\uff1abio\uff0cnio\uff0capr \u4e00\u822c\u4f7f\u7528  nio\u6a21\u5f0f\u3002\nbio \u6548\u7387\u4f4e\uff0capr \u5bf9\u7cfb\u7edf\u914d\u7f6e\u6709\u4e00\u4e9b\u6bd4\u8f83\u9ad8\u7684\u8981\u6c42\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u4e0b\u6765\uff0c\u9700\u8981\u6211\u4eec\u786e\u8ba4\u4e00\u4e0b\u81ea\u5df1\u7ebf\u4e0a\u7684 Tomcat \u8fd0\u884c\u6a21\u5f0f\u3002\u67e5\u770b\u914d\u7f6e\u6587\u4ef6 server.xml<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;Executor name=\"tomcatThreadPool\" \nnamePrefix=\"catalina-exec-\" \nmaxThreads=\"1024\" \nminSpareThreads=\"512\" \nprestartminSpareThreads=\"true\" \/&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5173\u952e\u914d\u7f6e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">maxThreads\uff1a\u6700\u5927\u7ebf\u7a0b\u6570, \u9ed8\u8ba4\u662f200\nminSpareThread\uff1a\u6700\u5c0f\u6d3b\u8dc3\u7ebf\u7a0b\u6570, \u9ed8\u8ba4\u662f25\nmaxQueueSize\uff1a\u6700\u5927\u7684\u7b49\u5f85\u961f\u5217\u4e2a\u6570\uff0c\u8d85\u8fc7\u5219\u8bf7\u6c42\u62d2\u7edd\u9ed8\u8ba4\u503c\u662fInteger.MAX_VALUE \uff0c\u4e00\u822c\u4e0d\u6539\u53d8\u3002\u5728\u67d0\u4e9b\u7d27\u6025\u72b6\u6001\u4fee\u590d\u95ee\u9898\u9700\u8981\u8c03\u6574\n\u8fde\u63a5\u5668\uff08Connector\uff09\uff1aConnector\u662f\u8fde\u63a5\u5668\uff0c\u8d1f\u8d23\u63a5\u6536\u5ba2\u6237\u7684\u8bf7\u6c42\uff0c\u4ee5\u53ca\u5411\u5ba2\u6237\u7aef\u56de\u9001\u54cd\u5e94\u7684\u6d88\u606f\u3002\u6240\u4ee5Connector\u7684\u4f18\u5316\u662f\u91cd\u8981\u90e8\u5206\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b Tomcat\u53ea\u652f\u6301200\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u8d85\u8fc7\u8fd9\u4e2a\u6570\u91cf\u7684\u8fde\u63a5\u5c06\u88ab\u7b49\u5f85\u751a\u81f3\u8d85\u65f6\u653e\u5f03\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u63d0\u9ad8\u8fd9\u65b9\u9762\u7684\u5904\u7406\u80fd\u529b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">nio \u914d\u7f6e server.xml<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;Connector port=\"14081\" protocol=\"org.apache.coyote.http11.Http11NioProtocol\"\nconnectionTimeout=\"20000\"\nexecutor=\"tomcatThreadPool\" \nURIEncoding=\"UTF-8\" \ncompression=\"on\"   \nuseBodyEncodingForURI=\"true\" \nenableLookups=\"false\" \nredirectPort=\"14443\" \/&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f71\u54cd\u6027\u80fd\u7684\u914d\u7f6e<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">protocol<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u275d<\/strong><\/p><p>org.apache.coyote.http11.Http11Protocol &#8211; \u963b\u585e\u5f0f\u7684Java\u8fde\u63a5\u5668\norg.apache.coyote.http11.Http11NioProtocol &#8211; \u4e0d\u963b\u585eJava\u8fde\u63a5\u5668\norg.apache.coyote.http11.Http11AprProtocol &#8211; APR \/ native \u8fde\u63a5\u5668\n\u9009\u62e9\u4e0d\u963b\u585eJava\u8fde\u63a5\u5668\u275e<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">enableLookups<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u82e5\u662f\u4f60\u60f3request.getRemoteHost()\u7684\u8c03\u7528\u5c65\u884c\uff0c\u4ee5\u4fbf\u8fd4\u56de\u7684\u957f\u9014\u5ba2\u6237\u7aef\u7684\u5b9e\u9645\u4e3b\u673a\u540d\u7684DNS\u67e5\u8be2\uff0c\u5219\u8bbe\u7f6e\u4e3atrue\u3002\u8bbe\u7f6e\u4e3afalse\u65f6\u8df3\u8fc7DNS\u67e5\u627e\uff0c\u5e76\u8fd4\u56de\u5b57\u7b26\u4e32\u7684IP\u5730\u5740\uff08\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\uff09\u3002\u9ed8\u8ba4\u573a\u666f\u4e0b\uff0c\u7981\u7528DNS\u67e5\u627e<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">compression<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bbe\u7f6e\u6210on\uff0c\u5f00\u542f\u538b\u7f29<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7981\u7528AJP\u94fe\u63a5\u5668<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528 Nginx + tomcat \u7684\u67b6\u6784\uff0c\u7528\u4e0d\u7740 AJP \u534f\u8bae\uff0c\u6240\u4ee5\u628a AJP \u8fde\u63a5\u5668\u7981\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">server.xml \u6ce8\u91ca\u6389\u4ee5\u4e0b\u914d\u7f6e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;Connector\u00a0port=\"8019\"\u00a0protocol=\"AJP\/1.3\"\u00a0redirectPort=\"8443\"\u00a0\/&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f18\u5316JVM<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 \/bin\/catalina.sh \u4e2d\u4fee\u6539 JAVA_OPTS \u53c2\u6570\uff0c\u8fd9\u91cc\u9700\u8981\u53c2\u7167\u673a\u5668\u914d\u7f6e\uff0c\u5bf9 JVM \u8fdb\u884c\u53c2\u6570\u4f18\u5316\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JDK1.7<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>JAVA_OPTS=\"-Djava.awt.headless=true\u00a0-Dfile.encoding=UTF-8\u00a0-server\u00a0-Xms512m\u00a0-Xmx1024m\u00a0-XX:NewSize=512m\u00a0-XX:MaxNewSize=1024M\u00a0-XX:PermSize=1024m\u00a0-XX:MaxPermSize=1024m\u00a0-XX:+DisableExplicitGC\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">JDK1.8<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>JAVA_OPTS=\"-Djava.awt.headless=true\u00a0-Dfile.encoding=UTF-8\u00a0-server\u00a0-Xms1024m\u00a0-Xmx1024m\u00a0-XX:NewSize=512m\u00a0-XX:MaxNewSize=1024M\u00a0-XX:+DisableExplicitGC\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">1.8 \u7248\u672c\u4e2d\u5df2\u7ecf\u6ca1\u6709 PermSize\u3001MaxPermSize\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JAVA8 \u91cc\u5bf9 metaspace \u53ef\u4ee5\u5728\u5c0f\u8303\u56f4\u81ea\u52a8\u6269\u5c55\u6c38\u751f\u4ee3\u907f\u514d\u6ea2\u51fa\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u8bf4\u8bf4\u4e0a\u9762 JDK \u914d\u7f6e\u7684\u53c2\u6570\u8bf4\u660e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Djava.awt.headless\uff1a\u6ca1\u6709\u8bbe\u5907\u3001\u952e\u76d8\u6216\u9f20\u6807\u7684\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Dfile.encoding\uff1a\u8bbe\u7f6e\u5b57\u7b26\u96c6<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-server\uff1ajvm\u7684server\u5de5\u4f5c\u6a21\u5f0f\uff0c\u5bf9\u5e94\u7684\u6709client\u5de5\u4f5c\u6a21\u5f0f\u3002\u4f7f\u7528\u201cjava -version\u201d\u53ef\u4ee5\u67e5\u770b\u5f53\u524d\u5de5\u4f5c\u6a21\u5f0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Xms1024m\uff1a\u521d\u59cbHeap\u5927\u5c0f\uff0c\u4f7f\u7528\u7684\u6700\u5c0f\u5185\u5b58<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Xmx1024m\uff1aJava heap\u6700\u5927\u503c\uff0c\u4f7f\u7528\u7684\u6700\u5927\u5185\u5b58\u3002\u7ecf\u9a8c: \u8bbe\u7f6eXms\u5927\u5c0f\u7b49\u4e8eXmx\u5927\u5c0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:NewSize=512m\uff1a\u8868\u793a\u65b0\u751f\u4ee3\u521d\u59cb\u5185\u5b58\u7684\u5927\u5c0f\uff0c\u5e94\u8be5\u5c0f\u4e8e -Xms\u7684\u503c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:MaxNewSize=1024M\uff1a\u8868\u793a\u65b0\u751f\u4ee3\u53ef\u88ab\u5206\u914d\u7684\u5185\u5b58\u7684\u6700\u5927\u4e0a\u9650\uff0c\u5e94\u8be5\u5c0f\u4e8e -Xmx\u7684\u503c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:PermSize=1024m\uff1a\u8bbe\u5b9a\u5185\u5b58\u7684\u6c38\u4e45\u4fdd\u5b58\u533a\u57df,\u5185\u5b58\u7684\u6c38\u4e45\u4fdd\u5b58\u533a\u57df\uff0cVM \u5b58\u653eClass \u548c Meta \u4fe1\u606f\uff0cJVM\u5728\u8fd0\u884c\u671f\u95f4\u4e0d\u4f1a\u6e05\u9664\u8be5\u533a\u57df<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u275d<\/strong><\/p><p>\u7a0b\u5e8f\u52a0\u8f7d\u5f88\u591aclass\u60c5\u51b5\u4e0b\uff0c\u8d85\u51faPermSize\u60c5\u51b5\u4e0b\nJDK1.7\u4f1a\u629b\u51fajava.lang.OutOfMemoryError: PermGen space\u5f02\u5e38\nJDK1.8\u4e0b\u4f1a\u629b\u51fa ERROR: java.lang.OutOfMemoryError: Metadata space \u5f02\u5e38\u275e<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:MaxPermSize=1024m\uff1a\u8bbe\u5b9a\u6700\u5927\u5185\u5b58\u7684\u6c38\u4e45\u4fdd\u5b58\u533a\u57df\u3002\u7ecf\u9a8c: \u8bbe\u7f6ePermSize\u5927\u5c0f\u7b49\u4e8eMaxPermSize\u5927\u5c0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+DisableExplicitGC\uff1a \u81ea\u52a8\u5c06System.gc() \u8c03\u7528\u8f6c\u6362\u6210\u4e00\u4e2a\u7a7a\u64cd\u4f5c\uff0c\u5373\u5e94\u7528\u4e2d\u8c03\u7528System.gc()\u4f1a\u53d8\u6210\u4e00\u4e2a\u7a7a\u64cd\u4f5c\uff0c\u907f\u514d\u7a0b\u5e8f\u5458\u5728\u4ee3\u7801\u91cc\u8fdb\u884cSystem.gc()\u8fd9\u79cd\u5371\u9669\u64cd\u4f5c\u3002System.gc() \u9664\u975e\u662f\u5230\u4e86\u4e07\u4e0d\u5f97\u4e5f\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\uff0c\u90fd\u5e94\u8be5\u4ea4\u7ed9 JVM\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5176\u4ed6\u4f18\u5316\u53c2\u6570<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">XX:SurvivorRatio=2\uff1a\u5e74\u8f7b\u4ee3\u4e2dEden\u533a\u4e0eSurvivor\u533a\u7684\u5927\u5c0f\u6bd4\u503c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:ReservedCodeCacheSize=256m\uff1a\u4fdd\u7559\u4ee3\u7801\u5360\u7528\u7684\u5185\u5b58\u5bb9\u91cf\uff0c\u65e0\u5927\u7684\u5f71\u54cd<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Xss1024k\uff1a\u5355\u4e2a\u7ebf\u7a0b\u5806\u6808\u5927\u5c0f\u503c\uff0c\u51cf\u5c11\u8fd9\u4e2a\u503c\u53ef\u4ee5\u751f\u6210\u66f4\u591a\u7ebf\u7a0b\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u4e8e\u4e00\u4e2a\u8fdb\u7a0b\u5185\u7684\u7ebf\u7a0b\u6570\u662f\u6709\u9650\u5236\u7684\uff0c\u7ecf\u9a8c\u503c\u57283000-5000\u5de6\u53f3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+CMSParallelRemarkEnabled\uff1aCMS \u5783\u573e\u56de\u6536\u7b97\u6cd5\uff0c\u5bf9\u54cd\u5e94\u65f6\u95f4\u7684\u91cd\u8981\u6027\u9700\u6c42 \u5927\u4e8e \u5bf9\u541e\u5410\u91cf\u7684\u8981\u6c42\uff0c\u80fd\u591f\u627f\u53d7\u5783\u573e\u56de\u6536\u7ebf\u7a0b\u548c\u5e94\u7528\u7ebf\u7a0b\u5171\u4eab\u5904\u7406\u5668\u8d44\u6e90\uff0c\u5e76\u4e14\u5e94\u7528\u4e2d\u5b58\u5728\u6bd4\u8f83\u591a\u7684\u957f\u751f\u547d\u5468\u671f\u7684\u5bf9\u8c61\u7684\u5e94\u7528<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+UseCMSCompactAtFullCollection\uff1a\u5728\u4f7f\u7528concurrent gc \u7684\u60c5\u51b5\u4e0b, \u9632\u6b62 memoryfragmention, \u5bf9live object \u8fdb\u884c\u6574\u7406, \u4f7f memory \u788e\u7247\u51cf\u5c11\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+UseCMSInitiatingOccupancyOnly\uff1a\u5728FULL GC\u7684\u65f6\u5019\uff0c \u5bf9\u5e74\u8001\u4ee3\u7684\u538b\u7f29\u3002CMS\u662f\u4e0d\u4f1a\u79fb\u52a8\u5185\u5b58\u7684\uff0c \u56e0\u6b64\u8fd9\u4e2a\u975e\u5e38\u5bb9\u6613\u4ea7\u751f\u788e\u7247\uff0c \u5bfc\u81f4\u5185\u5b58\u4e0d\u591f\u7528\uff0c \u56e0\u6b64\uff0c \u5185\u5b58\u7684\u538b\u7f29\u8fd9\u4e2a\u65f6\u5019\u5c31\u4f1a\u88ab\u542f\u7528\u3002 \u589e\u52a0\u8fd9\u4e2a\u53c2\u6570\u662f\u4e2a\u597d\u4e60\u60ef\u3002\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd,\u4f46\u662f\u53ef\u4ee5\u6d88\u9664\u788e\u7247\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:CMSInitiatingOccupancyFraction=60\uff1a\u4f7f\u7528cms\u4f5c\u4e3a\u5783\u573e\u56de\u6536, \u4f7f\u752860\uff05\u540e\u5f00\u59cbCMS\u6536\u96c6<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+UseGCOverheadLimit\uff1a\u7528\u6765\u9650\u5236\u4f7f\u7528\u5185\u5b58\uff0c\u5982\u679c\u4e0d\u505a\u63a7\u5236\uff0c\u53ef\u80fd\u4f1a\u62a5\u51fa\njava.lang.OutOfMemoryError: GC overhead limit exceeded<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+UseConcMarkSweepGC\uff1a\u4f7f\u7528CMS\u5185\u5b58\u6536\u96c6<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+UseParNewGC\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u4e3a\u5e76\u884c\u6536\u96c6<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+HeapDumpOnOutOfMemoryError<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:HeapDumpPath=\/x\/dump_tomcat.hprof\uff1aJVM\u4f1a\u5728\u9047\u5230OutOfMemoryError\u65f6\u62cd\u6444\u4e00\u4e2a\u201c\u5806\u8f6c\u50a8\u5feb\u7167\u201d\uff0c\u5e76\u5c06\u5176\u4fdd\u5b58\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Xloggc:\/xx\/gc_tomcat.log\uff1agc\u7684\u65e5\u5fd7\uff0c\u5982\u679c\u8be5\u65e5\u5fd7\u4e2d\u51fa\u73b0\u9891\u7e41\u7684Full GC\u5c31\u662f\u6709\u76f8\u5173\u7684\u7cfb\u7edf\u95ee\u9898\uff0c\u5982\u679c\u5f88\u5c11\uff0c\u8bf4\u660e\u6682\u65f6\u8fd8\u7b97\u6b63\u5e38<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+PrintGCDateStamps\uff1a\u8f93\u51faGC\u7684\u65f6\u95f4\u6233\uff08\u4ee5\u57fa\u51c6\u65f6\u95f4\u7684\u5f62\u5f0f\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-XX:+PrintGCDetails\uff1a\u8f93\u51faGC\u7684\u65e5\u5fd7\u683c\u5f0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Dnetworkaddress.cache.ttl=60 \u548c -Dsun.net.inetaddr.ttl=60\uff1a\u8bbe\u7f6eDNS\u7f13\u5b58\u65f6\u95f4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-DautoStartup=false \u548c -Dsun.net.client.defaultConnectTimeout=60000\uff1a\u8fde\u63a5\u5efa\u7acb\u8d85\u65f6\u65f6\u95f4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Dsun.net.client.defaultReadTimeout=60000\uff1a\u5185\u5bb9\u83b7\u53d6\u8d85\u65f6\u8bbe\u7f6e<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">-Djmagick.systemclassloader=no\uff1a\u662f\u5426\u751f\u6210\u7f29\u7565\u56fe\u7684\u4e00\u4e2a\u6846\u67b6\u7684\u914d\u7f6e<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6700\u4f73\u5b9e\u8df5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>export\u00a0JAVA_OPTS=\"-server\u00a0-showversion\u00a0-Xms2000m\u00a0-Xmx2000m\u00a0-Xmn500m\u00a0-XX:PermSize=256m\u00a0-XX:MaxPermSize=256m\u00a0-XX:SurvivorRatio=2\u00a0-XX:ReservedCodeCacheSize=256m\u00a0-Xss1024k\u00a0-Djava.awt.headless=true\u00a0-XX:+CMSParallelRemarkEnabled\u00a0-XX:+UseCMSCompactAtFullCollection\u00a0-XX:+UseCMSInitiatingOccupancyOnly\u00a0-XX:CMSInitiatingOccupancyFraction=60\u00a0-XX:+UseGCOverheadLimit\u00a0-XX:+UseConcMarkSweepGC\u00a0-XX:+UseParNewGC\u00a0-XX:+HeapDumpOnOutOfMemoryError\u00a0-XX:HeapDumpPath=\/tomcat_path\/logs\/dump_tomcat.hprof\u00a0-Xloggc:\/tomcat_path\/logs\/gc_tomcat.log\u00a0-XX:+PrintGCDateStamps\u00a0-XX:+PrintGCDetails\u00a0-XX:+PrintGCDetails\u00a0-Dnetworkaddress.cache.ttl=60\u00a0-Dsun.net.inetaddr.ttl=60\u00a0-DautoStartup=false\u00a0-Dsun.net.client.defaultConnectTimeout=60000\u00a0-Dsun.net.client.defaultReadTimeout=60000\u00a0-Djmagick.systemclassloader=no\u00a0-Djava.security.egd=file:\/dev\/.\/urandom\u00a0-Dfile.encoding=UTF-8\"<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e38\u89c1JVM\u5f02\u5e38<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">JVM Heap\uff08\u5806\uff09\u6ea2\u51fa<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">java.lang.OutOfMemoryError: Java heap space \u2014-JVM Heap\uff08\u5806\uff09\u6ea2\u51fa<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u275d<\/strong><\/p><p>JVM \u5728\u542f\u52a8\u7684\u65f6\u5019\u4f1a\u81ea\u52a8\u8bbe\u7f6e JVM Heap \u7684\u503c\uff0c\u5176\u521d\u59cb\u7a7a\u95f4\uff08\u5373-Xms\uff09\u662f\u7269\u7406\u5185\u5b58\u76841\/64\uff0c\u6700\u5927\u7a7a\u95f4\uff08-Xmx\uff09\u4e0d\u53ef\u8d85\u8fc7\u7269\u7406\u5185\u5b58\u3002\u53ef\u4ee5\u5229\u7528 JVM\u63d0\u4f9b\u7684 -Xmn -Xms -Xmx \u7b49\u9009\u9879\u53ef\u8fdb\u884c\u8bbe\u7f6e\u3002Heap \u7684\u5927\u5c0f\u662f Young Generation \u548c Tenured Generaion \u4e4b\u548c\u3002\u5728 JVM \u4e2d\u5982\u679c 98\uff05 \u7684\u65f6\u95f4\u662f\u7528\u4e8e GC\uff0c\u4e14\u53ef\u7528\u7684 Heap size \u4e0d\u8db3 2\uff05 \u7684\u65f6\u5019\u5c06\u629b\u51fa\u6b64\u5f02\u5e38\u4fe1\u606f\u3002\u275e<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u51b3\u65b9\u6cd5\uff1a\u624b\u52a8\u8bbe\u7f6e JVM Heap\uff08\u5806\uff09\u7684\u5927\u5c0f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PermGen space\u6ea2\u51fa<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">java.lang.OutOfMemoryError: PermGen space \u2014- PermGen space\u6ea2\u51fa\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u275d<\/strong><\/p><p>jdk1.8 \u629b\u51fa ERROR: java.lang.OutOfMemoryError: Metadata space \u5f02\u5e38\nPermGen space \u7684\u5168\u79f0\u662f Permanent Generation space\uff0c\u662f\u6307\u5185\u5b58\u7684\u6c38\u4e45\u4fdd\u5b58\u533a\u57df\u3002\u4e3a\u4ec0\u4e48\u4f1a\u5185\u5b58\u6ea2\u51fa\uff0c\u8fd9\u662f\u7531\u4e8e\u8fd9\u5757\u5185\u5b58\u4e3b\u8981\u662f\u88ab JVM \u5b58\u653eClass \u548c Meta \u4fe1\u606f\u7684\uff0cClass \u5728\u88ab Load \u7684\u65f6\u5019\u88ab\u653e\u5165 PermGen space \u533a\u57df\uff0c\u5b83\u548c\u5b58\u653e Instance \u7684 Heap \u533a\u57df\u4e0d\u540c\uff0csun \u7684 GC \u4e0d\u4f1a\u5728\u4e3b\u7a0b\u5e8f\u8fd0\u884c\u671f\u5bf9 PermGen space \u8fdb\u884c\u6e05\u7406\uff0c\u6240\u4ee5\u5982\u679c\u4f60\u7684 APP \u4f1a\u8f7d\u5165\u5f88\u591a CLASS \u7684\u8bdd\uff0c\u5c31\u5f88\u53ef\u80fd\u51fa\u73b0 PermGen space \u6ea2\u51fa\u3002\u275e<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u51b3\u65b9\u6cd5\uff1a \u624b\u52a8\u8bbe\u7f6e MaxPermSize \u5927\u5c0f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6808\u6ea2\u51fa<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">java.lang.StackOverflowError \u2014- \u6808\u6ea2\u51fa<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u275d<\/strong><\/p><p>\u6808\u6ea2\u51fa\u4e86\uff0cJVM \u4f9d\u7136\u662f\u91c7\u7528\u6808\u5f0f\u7684\u865a\u62df\u673a\u3002\u51fd\u6570\u7684\u8c03\u7528\u8fc7\u7a0b\u90fd\u4f53\u73b0\u5728\u5806\u6808\u548c\u9000\u6808\u4e0a\u4e86\u3002\u8c03\u7528\u6784\u9020\u51fd\u6570\u7684 \u201c\u5c42\u201d\u592a\u591a\u4e86\uff0c\u4ee5\u81f4\u4e8e\u628a\u6808\u533a\u6ea2\u51fa\u4e86\u3002\u901a\u5e38\u6765\u8bb2\uff0c\u4e00\u822c\u6808\u533a\u8fdc\u8fdc\u5c0f\u4e8e\u5806\u533a\u7684\uff0c\u56e0\u4e3a\u51fd\u6570\u8c03\u7528\u8fc7\u7a0b\u5f80\u5f80\u4e0d\u4f1a\u591a\u4e8e\u4e0a\u5343\u5c42\uff0c\u800c\u5373\u4fbf\u6bcf\u4e2a\u51fd\u6570\u8c03\u7528\u9700\u8981 1K \u7684\u7a7a\u95f4\uff08\u8fd9\u4e2a\u5927\u7ea6\u76f8\u5f53\u4e8e\u5728\u4e00\u4e2a C \u51fd\u6570\u5185\u58f0\u660e\u4e86 256 \u4e2a int \u7c7b\u578b\u7684\u53d8\u91cf\uff09\uff0c\u90a3\u4e48\u6808\u533a\u4e5f\u4e0d\u8fc7\u662f\u9700\u8981 1MB \u7684\u7a7a\u95f4\u3002\u901a\u5e38\u6808\u7684\u5927\u5c0f\u662f 1\uff0d2MB \u7684\u3002\u275e<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u51b3\u65b9\u6cd5: \u4ee3\u7801\u4e2d\u9012\u5f52\u4e5f\u4e0d\u8981\u9012\u5f52\u7684\u5c42\u6b21\u8fc7\u591a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u5185\u5bb9\uff0c\u5e0c\u671b\u80fd\u591f\u5e2e\u52a9\u5230\u5927\u5bb6\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u89e3\u51b3\u5b9e\u9645\u95ee\u9898\uff0c\u4ee5\u53ca\u9762\u8bd5\u4e2d\u80fd\u591f\u8f7b\u677e\u8fc7\u5173\u3002\u5047\u671f\u8d8a\u4e0d\u8db3\uff0c\u795d\u5927\u5bb6\u90fd\u73a9\u7684\u5f00\u5fc3\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=5112\">Tomcat \u7684\u8c03\u4f18\u6700\u4f73\u5b9e\u8df5<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u9762\u8bd5\u5b98\uff1aTomcat \u7684\u8c03\u4f18\u600e\u4e48\u505a\uff1f\u4f60\u7684\u6700\u4f73\u5b9e\u8df5\u6709\u54ea\u4e9b\uff1f \u524d\u8a00 Tomcat\u4f5c\u4e3aWeb\u5e94\u7528\u7684\u670d\u52a1\u5668\uff0c\u76ee\u524d\u7edd\u5927\u591a [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[263,112,1165,599,1113],"class_list":["post-5112","post","type-post","status-publish","format-standard","hentry","category-java","tag-substring","tag-tomcat","tag-1165","tag-599","tag-1113"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5112"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5112\/revisions"}],"predecessor-version":[{"id":5113,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5112\/revisions\/5113"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5112"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}