{"id":3653,"date":"2018-08-02T12:11:23","date_gmt":"2018-08-02T04:11:23","guid":{"rendered":"http:\/\/switch.linesno.com\/?p=3653"},"modified":"2018-08-02T12:11:23","modified_gmt":"2018-08-02T04:11:23","slug":"jvm-%e5%a0%86%e5%86%85%e5%ad%98%e5%92%8c%e9%9d%9e%e5%a0%86%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"http:\/\/switch.linesno.com\/?p=3653","title":{"rendered":"JVM \u5806\u5185\u5b58\u548c\u975e\u5806\u5185\u5b58"},"content":{"rendered":"<h2>\u5806\u548c\u975e\u5806\u5185\u5b58<\/h2>\n<p>\u6309\u7167\u5b98\u65b9\u7684\u8bf4\u6cd5\uff1a\u201cJava \u865a\u62df\u673a\u5177\u6709\u4e00\u4e2a\u5806(Heap)\uff0c\u5806\u662f\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\uff0c\u6240\u6709\u7c7b\u5b9e\u4f8b\u548c\u6570\u7ec4\u7684\u5185\u5b58\u5747\u4ece\u6b64\u5904\u5206\u914d\u3002\u5806\u662f\u5728 Java \u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa\u7684\u3002\u201d\u201c\u5728JVM\u4e2d\u5806\u4e4b\u5916\u7684\u5185\u5b58\u79f0\u4e3a\u975e\u5806\u5185\u5b58(Non-heap memory)\u201d\u3002<\/p>\n<p>JVM\u4e3b\u8981\u7ba1\u7406\u4e24\u79cd\u7c7b\u578b\u7684\u5185\u5b58\uff1a\u5806\u548c\u975e\u5806\u3002<\/p>\n<p>Heap memory Code Cache<br \/>\nEden Space<br \/>\nSurvivor Space<br \/>\nTenured Gen<br \/>\nnon-heap memory Perm Gen<br \/>\nnative heap?(I guess)<\/p>\n<h3>\u5806\u5185\u5b58<\/h3>\n<p>Java \u865a\u62df\u673a\u5177\u6709\u4e00\u4e2a\u5806\uff0c\u5806\u662f\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\uff0c\u6240\u6709\u7c7b\u5b9e\u4f8b\u548c\u6570\u7ec4\u7684\u5185\u5b58\u5747\u4ece\u6b64\u5904\u5206\u914d\u3002\u5806\u662f\u5728 Java \u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa\u7684\u3002\u5bf9\u8c61\u7684\u5806\u5185\u5b58\u7531\u79f0\u4e3a\u5783\u573e\u56de\u6536\u5668\u7684\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u7cfb\u7edf\u56de\u6536\u3002<\/p>\n<p>\u5806\u7684\u5927\u5c0f\u53ef\u4ee5\u56fa\u5b9a\uff0c\u4e5f\u53ef\u4ee5\u6269\u5927\u548c\u7f29\u5c0f\u3002\u5806\u7684\u5185\u5b58\u4e0d\u9700\u8981\u662f\u8fde\u7eed\u7a7a\u95f4\u3002<\/p>\n<h3>\u975e\u5806\u5185\u5b58<\/h3>\n<p>Java \u865a\u62df\u673a\u7ba1\u7406\u5806\u4e4b\u5916\u7684\u5185\u5b58\uff08\u79f0\u4e3a\u975e\u5806\u5185\u5b58\uff09\u3002<\/p>\n<p>Java \u865a\u62df\u673a\u5177\u6709\u4e00\u4e2a\u7531\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u7684\u65b9\u6cd5\u533a\u3002\u65b9\u6cd5\u533a\u5c5e\u4e8e\u975e\u5806\u5185\u5b58\u3002\u5b83\u5b58\u50a8\u6bcf\u4e2a\u7c7b\u7ed3\u6784\uff0c\u5982\u8fd0\u884c\u65f6\u5e38\u6570\u6c60\u3001\u5b57\u6bb5\u548c\u65b9\u6cd5\u6570\u636e\uff0c\u4ee5\u53ca\u65b9\u6cd5\u548c\u6784\u9020\u65b9\u6cd5\u7684\u4ee3\u7801\u3002\u5b83\u662f\u5728 Java \u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa\u7684\u3002<\/p>\n<p>\u65b9\u6cd5\u533a\u5728\u903b\u8f91\u4e0a\u5c5e\u4e8e\u5806\uff0c\u4f46 Java \u865a\u62df\u673a\u5b9e\u73b0\u53ef\u4ee5\u9009\u62e9\u4e0d\u5bf9\u5176\u8fdb\u884c\u56de\u6536\u6216\u538b\u7f29\u3002\u4e0e\u5806\u7c7b\u4f3c\uff0c\u65b9\u6cd5\u533a\u7684\u5927\u5c0f\u53ef\u4ee5\u56fa\u5b9a\uff0c\u4e5f\u53ef\u4ee5\u6269\u5927\u548c\u7f29\u5c0f\u3002\u65b9\u6cd5\u533a\u7684\u5185\u5b58\u4e0d\u9700\u8981\u662f\u8fde\u7eed\u7a7a\u95f4\u3002<\/p>\n<p>\u9664\u4e86\u65b9\u6cd5\u533a\u5916\uff0cJava \u865a\u62df\u673a\u5b9e\u73b0\u53ef\u80fd\u9700\u8981\u7528\u4e8e\u5185\u90e8\u5904\u7406\u6216\u4f18\u5316\u7684\u5185\u5b58\uff0c\u8fd9\u79cd\u5185\u5b58\u4e5f\u662f\u975e\u5806\u5185\u5b58\u3002\u4f8b\u5982\uff0cJIT \u7f16\u8bd1\u5668\u9700\u8981\u5185\u5b58\u6765\u5b58\u50a8\u4ece Java \u865a\u62df\u673a\u4ee3\u7801\u8f6c\u6362\u800c\u6765\u7684\u672c\u673a\u4ee3\u7801\uff0c\u4ece\u800c\u83b7\u5f97\u9ad8\u6027\u80fd\u3002<\/p>\n<h3>\u51e0\u4e2a\u57fa\u672c\u6982\u5ff5<\/h3>\n<p>PermGen space\uff1a\u5168\u79f0\u662fPermanent Generation space\uff0c\u5373\u6c38\u4e45\u4ee3\u3002\u5c31\u662f\u8bf4\u662f\u6c38\u4e45\u4fdd\u5b58\u7684\u533a\u57df,\u7528\u4e8e\u5b58\u653eClass\u548cMeta\u4fe1\u606f\uff0cClass\u5728\u88abLoad\u7684\u65f6\u5019\u88ab\u653e\u5165\u8be5\u533a\u57df\uff0cGC(Garbage Collection)\u5e94\u8be5\u4e0d\u4f1a\u5bf9PermGen space\u8fdb\u884c\u6e05\u7406\uff0c\u6240\u4ee5\u5982\u679c\u4f60\u7684APP\u4f1aLOAD\u5f88\u591aCLASS\u7684\u8bdd\uff0c\u5c31\u5f88\u53ef\u80fd\u51fa\u73b0PermGen space\u9519\u8bef\u3002<\/p>\n<p>Heap space\uff1a\u5b58\u653eInstance\u3002<\/p>\n<p>Java Heap\u5206\u4e3a3\u4e2a\u533a\uff0cYoung\u5373\u65b0\u751f\u4ee3\uff0cOld\u5373\u8001\u751f\u4ee3\u548cPermanent\u3002<\/p>\n<p>Young\u4fdd\u5b58\u521a\u5b9e\u4f8b\u5316\u7684\u5bf9\u8c61\u3002\u5f53\u8be5\u533a\u88ab\u586b\u6ee1\u65f6\uff0cGC\u4f1a\u5c06\u5bf9\u8c61\u79fb\u5230Old\u533a\u3002Permanent\u533a\u5219\u8d1f\u8d23\u4fdd\u5b58\u53cd\u5c04\u5bf9\u8c61\u3002<\/p>\n<h3>\u5806\u5185\u5b58\u5206\u914d<\/h3>\n<ul>\n<li>JVM\u521d\u59cb\u5206\u914d\u7684\u5806\u5185\u5b58\u7531-Xms\u6307\u5b9a\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/64\uff1b<\/li>\n<li>JVM\u6700\u5927\u5206\u914d\u7684\u5806\u5185\u5b58\u7531-Xmx\u6307\u5b9a\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/4\u3002<\/li>\n<li>\u9ed8\u8ba4\u7a7a\u4f59\u5806\u5185\u5b58\u5c0f\u4e8e40%\u65f6\uff0cJVM\u5c31\u4f1a\u589e\u5927\u5806\u76f4\u5230-Xmx\u7684\u6700\u5927\u9650\u5236\uff1b<\/li>\n<li>\u7a7a\u4f59\u5806\u5185\u5b58\u5927\u4e8e70%\u65f6\uff0cJVM\u4f1a\u51cf\u5c11\u5806\u76f4\u5230-Xms\u7684\u6700\u5c0f\u9650\u5236\u3002<\/li>\n<li>\u56e0\u6b64\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\u3002<\/li>\n<li>\u8bf4\u660e\uff1a\u5982\u679c-Xmx \u4e0d\u6307\u5b9a\u6216\u8005\u6307\u5b9a\u504f\u5c0f\uff0c\u5e94\u7528\u53ef\u80fd\u4f1a\u5bfc\u81f4java.lang.OutOfMemory\u9519\u8bef\uff0c\u6b64\u9519\u8bef\u6765\u81eaJVM\uff0c\u4e0d\u662fThrowable\u7684\uff0c\u65e0\u6cd5\u7528try\u2026catch\u6355\u6349\u3002<\/li>\n<\/ul>\n<h3>\u975e\u5806\u5185\u5b58\u5206\u914d<\/h3>\n<ul>\n<li>JVM\u4f7f\u7528-XX:PermSize\u8bbe\u7f6e\u975e\u5806\u5185\u5b58\u521d\u59cb\u503c\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/64\uff1b<\/li>\n<li>\u7531XX:MaxPermSize\u8bbe\u7f6e\u6700\u5927\u975e\u5806\u5185\u5b58\u7684\u5927\u5c0f\uff0c\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/4\u3002<\/li>\n<\/ul>\n<ol>\n<li>\u8fd8\u6709\u4e00\u8bf4\uff1aMaxPermSize\u7f3a\u7701\u503c\u548c-server -client\u9009\u9879\u76f8\u5173\uff0c-server\u9009\u9879\u4e0b\u9ed8\u8ba4MaxPermSize\u4e3a64m\uff0c-client\u9009\u9879\u4e0b\u9ed8\u8ba4MaxPermSize\u4e3a32m\u3002\u8fd9\u4e2a\u6211\u6ca1\u6709\u5b9e\u9a8c\u3002<\/li>\n<\/ol>\n<ul>\n<li>XX:MaxPermSize\u8bbe\u7f6e\u8fc7\u5c0f\u4f1a\u5bfc\u81f4java.lang.OutOfMemoryError: PermGen space \u5c31\u662f\u5185\u5b58\u76ca\u51fa\u3002<\/li>\n<li>\u4e3a\u4ec0\u4e48\u4f1a\u5185\u5b58\u76ca\u51fa\uff1a<\/li>\n<\/ul>\n<ol>\n<li>\u8fd9\u4e00\u90e8\u5206\u5185\u5b58\u7528\u4e8e\u5b58\u653eClass\u548cMeta\u7684\u4fe1\u606f\uff0cClass\u5728\u88ab Load\u7684\u65f6\u5019\u88ab\u653e\u5165PermGen space\u533a\u57df\uff0c\u5b83\u548c\u5b58\u653eInstance\u7684Heap\u533a\u57df\u4e0d\u540c\u3002<\/li>\n<li>GC(Garbage Collection)\u4e0d\u4f1a\u5728\u4e3b\u7a0b\u5e8f\u8fd0\u884c\u671f\u5bf9PermGen space\u8fdb\u884c\u6e05\u7406\uff0c\u6240\u4ee5\u5982\u679c\u4f60\u7684APP\u4f1aLOAD\u5f88\u591aCLASS \u7684\u8bdd,\u5c31\u5f88\u53ef\u80fd\u51fa\u73b0PermGen space\u9519\u8bef\u3002<\/li>\n<\/ol>\n<ul>\n<li>\u8fd9\u79cd\u9519\u8bef\u5e38\u89c1\u5728web\u670d\u52a1\u5668\u5bf9JSP\u8fdb\u884cpre compile\u7684\u65f6\u5019\u3002<\/li>\n<\/ul>\n<h2>JVM\u5185\u5b58\u9650\u5236(\u6700\u5927\u503c)<\/h2>\n<ul>\n<li>\u9996\u5148JVM\u5185\u5b58\u9650\u5236\u4e8e\u5b9e\u9645\u7684\u6700\u5927\u7269\u7406\u5185\u5b58\uff0c\u5047\u8bbe\u7269\u7406\u5185\u5b58\u65e0\u9650\u5927\u7684\u8bdd\uff0cJVM\u5185\u5b58\u7684\u6700\u5927\u503c\u8ddf\u64cd\u4f5c\u7cfb\u7edf\u6709\u5f88\u5927\u7684\u5173\u7cfb\u3002\u7b80\u5355\u7684\u8bf4\u5c3132\u4f4d\u5904\u7406\u5668\u867d\u7136\u53ef\u63a7\u5185\u5b58\u7a7a\u95f4\u67094GB,\u4f46\u662f\u5177\u4f53\u7684\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u7ed9\u4e00\u4e2a\u9650\u5236\uff0c\u8fd9\u4e2a\u9650\u5236\u4e00\u822c\u662f2GB-3GB\uff08\u4e00\u822c\u6765\u8bf4Windows\u7cfb\u7edf\u4e0b\u4e3a1.5G-2G\uff0cLinux\u7cfb\u7edf\u4e0b\u4e3a2G-3G\uff09\uff0c\u800c64bit\u4ee5\u4e0a\u7684\u5904\u7406\u5668\u5c31\u4e0d\u4f1a\u6709\u9650\u5236\u4e86\u3002<\/li>\n<li>\u4e3a\u4ec0\u4e48\u6709\u7684\u673a\u5668\u6211\u5c06-Xmx\u548c-XX:MaxPermSize\u90fd\u8bbe\u7f6e\u4e3a512M\u4e4b\u540eEclipse\u53ef\u4ee5\u542f\u52a8\uff0c\u800c\u6709\u4e9b\u673a\u5668\u65e0\u6cd5\u542f\u52a8\uff1f<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u4e0a\u9762\u5bf9JVM\u5185\u5b58\u7ba1\u7406\u7684\u4ecb\u7ecd\u6211\u4eec\u5df2\u7ecf\u4e86\u89e3\u5230JVM\u5185\u5b58\u5305\u542b\u4e24\u79cd\uff1a\u5806\u5185\u5b58\u548c\u975e\u5806\u5185\u5b58\uff0c\u53e6\u5916JVM\u6700\u5927\u5185\u5b58\u9996\u5148\u53d6\u51b3\u4e8e\u5b9e\u9645\u7684\u7269\u7406\u5185\u5b58\u548c\u64cd\u4f5c\u7cfb\u7edf\u3002\u6240\u4ee5\u8bf4\u8bbe\u7f6eVM\u53c2\u6570\u5bfc\u81f4\u7a0b\u5e8f\u65e0\u6cd5\u542f\u52a8\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u79cd\u539f\u56e0\uff1a<\/p>\n<ol>\n<li>\u53c2\u6570\u4e2d-Xms\u7684\u503c\u5927\u4e8e-Xmx\uff0c\u6216\u8005-XX:PermSize\u7684\u503c\u5927\u4e8e-XX:MaxPermSize\uff1b<\/li>\n<li>-Xmx\u7684\u503c\u548c-XX:MaxPermSize\u7684\u603b\u548c\u8d85\u8fc7\u4e86JVM\u5185\u5b58\u7684\u6700\u5927\u9650\u5236\uff0c\u6bd4\u5982\u5f53\u524d\u64cd\u4f5c\u7cfb\u7edf\u6700\u5927\u5185\u5b58\u9650\u5236\uff0c\u6216\u8005\u5b9e\u9645\u7684\u7269\u7406\u5185\u5b58\u7b49\u7b49\u3002\u8bf4\u5230\u5b9e\u9645\u7269\u7406\u5185\u5b58\u8fd9\u91cc\u9700\u8981\u8bf4\u660e\u4e00\u70b9\u7684\u662f\uff0c\u5982\u679c\u4f60\u7684\u5185\u5b58\u662f1024MB\uff0c\u4f46\u5b9e\u9645\u7cfb\u7edf\u4e2d\u7528\u5230\u7684\u5e76\u4e0d\u53ef\u80fd\u662f1024MB\uff0c\u56e0\u4e3a\u6709\u4e00\u90e8\u5206\u88ab\u786c\u4ef6\u5360\u7528\u4e86\u3002<\/li>\n<\/ol>\n<ul>\n<li>\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u53cc\u6838\u7684CPU\uff0c\u4e5f\u8bb8\u53ef\u4ee5\u5c1d\u8bd5\u8fd9\u4e2a\u53c2\u6570: -XX:+UseParallelGC \u8ba9GC\u53ef\u4ee5\u66f4\u5feb\u7684\u6267\u884c\u3002\uff08\u53ea\u662fJDK 5\u91cc\u5bf9GC\u65b0\u589e\u52a0\u7684\u53c2\u6570\uff09<\/li>\n<li>\u5982\u679c\u4f60\u7684WEB APP\u4e0b\u90fd\u7528\u4e86\u5927\u91cf\u7684\u7b2c\u4e09\u65b9jar\uff0c\u5176\u5927\u5c0f\u8d85\u8fc7\u4e86\u670d\u52a1\u5668jvm\u9ed8\u8ba4\u7684\u5927\u5c0f\uff0c\u90a3\u4e48\u5c31\u4f1a\u4ea7\u751f\u5185\u5b58\u76ca\u51fa\u95ee\u9898\u4e86\u3002\u89e3\u51b3\u65b9\u6cd5\uff1a \u8bbe\u7f6eMaxPermSize\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<ol>\n<li>\u589e\u52a0\u670d\u52a1\u5668\u542f\u52a8\u7684JVM\u53c2\u6570\u8bbe\u7f6e\uff1a -Xms128m -Xmx256m -XX:PermSize=128M -XX:MaxNewSize=256m -XX:MaxPermSize=256m<\/li>\n<li>\u5982tomcat\uff0c\u4fee\u6539TOMCAT_HOME\/bin\/catalina.sh\uff0c\u5728echo \u201cUsing CATALINA_BASE: $CATALINA_BASE\u201d\u4e0a\u9762\u52a0\u5165\u4ee5\u4e0b\u884c\uff1aJAVA_OPTS=\u201d-server -XX:PermSize=64M -XX:MaxPermSize=128m<\/li>\n<\/ol>\n<ul>\n<li>\u5efa\u8bae\uff1a\u5c06\u76f8\u540c\u7684\u7b2c\u4e09\u65b9jar\u6587\u4ef6\u79fb\u7f6e\u5230tomcat\/shared\/lib\u76ee\u5f55\u4e0b\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11jar \u6587\u6863\u91cd\u590d\u5360\u7528\u5185\u5b58<\/li>\n<\/ul>\n<h2>JVM\u5185\u5b58\u8bbe\u7f6e\u53c2\u6570<\/h2>\n<ul>\n<li>\u5185\u5b58\u8bbe\u7f6e\u53c2\u6570<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<th>\u8bbe\u7f6e\u9879<\/th>\n<th>\u8bf4\u660e<\/th>\n<\/tr>\n<tr>\n<td>-Xms512m<\/td>\n<td>\u8868\u793aJVM\u521d\u59cb\u5206\u914d\u7684\u5806\u5185\u5b58\u5927\u5c0f\u4e3a512m\uff08JVM Heap(\u5806\u5185\u5b58)\u6700\u5c0f\u5c3a\u5bf8\uff0c\u521d\u59cb\u5206\u914d\uff09<\/td>\n<\/tr>\n<tr>\n<td>-Xmx1024m<\/td>\n<td>JVM\u6700\u5927\u5141\u8bb8\u5206\u914d\u7684\u5806\u5185\u5b58\u5927\u5c0f\u4e3a1024m\uff0c\u6309\u9700\u5206\u914d\uff08JVM Heap(\u5806\u5185\u5b58)\u6700\u5927\u5141\u8bb8\u7684\u5c3a\u5bf8\uff0c\u6309\u9700\u5206\u914d\uff09<\/td>\n<\/tr>\n<tr>\n<td>-XX:PermSize=512M<\/td>\n<td>JVM\u521d\u59cb\u5206\u914d\u7684\u975e\u5806\u5185\u5b58<\/td>\n<\/tr>\n<tr>\n<td>-XX:MaxPermSize=1024M<\/td>\n<td>JVM\u6700\u5927\u5141\u8bb8\u5206\u914d\u7684\u975e\u5806\u5185\u5b58\uff0c\u6309\u9700\u5206\u914d<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\">-XX:NewSize\/-XX:MaxNewSize<\/td>\n<td>\u5b9a\u4e49YOUNG\u6bb5\u7684\u5c3a\u5bf8\uff0cNewSize\u4e3aJVM\u542f\u52a8\u65f6YOUNG\u7684\u5185\u5b58\u5927\u5c0f\uff1b<\/td>\n<\/tr>\n<tr>\n<td>MaxNewSize\u4e3a\u6700\u5927\u53ef\u5360\u7528\u7684YOUNG\u5185\u5b58\u5927\u5c0f\u3002<\/td>\n<\/tr>\n<tr>\n<td>-XX:SurvivorRatio<\/td>\n<td>\u8bbe\u7f6eYOUNG\u4ee3\u4e2dSurvivor\u7a7a\u95f4\u548cEden\u7a7a\u95f4\u7684\u6bd4\u4f8b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u8bf4\u660e\uff1a<\/li>\n<\/ul>\n<ol>\n<li>\u5982\u679c-Xmx\u4e0d\u6307\u5b9a\u6216\u8005\u6307\u5b9a\u504f\u5c0f\uff0c\u5e94\u7528\u53ef\u80fd\u4f1a\u5bfc\u81f4java.lang.OutOfMemory\u9519\u8bef\uff0c\u6b64\u9519\u8bef\u6765\u81eaJVM\u4e0d\u662fThrowable\u7684\uff0c\u65e0\u6cd5\u7528try\u2026catch\u6355\u6349\u3002<\/li>\n<li>PermSize\u548cMaxPermSize\u6307\u660e\u865a\u62df\u673a\u4e3ajava\u6c38\u4e45\u751f\u6210\u5bf9\u8c61\uff08Permanate generation\uff09\u5982\uff0cclass\u5bf9\u8c61\u3001\u65b9\u6cd5\u5bf9\u8c61\u8fd9\u4e9b\u53ef\u53cd\u5c04\uff08reflective\uff09\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u9650\u5236\uff0c\u8fd9\u4e9b\u5185\u5b58\u4e0d\u5305\u62ec\u5728Heap\uff08\u5806\u5185\u5b58\uff09\u533a\u4e4b\u4e2d\u3002<\/li>\n<li>-XX:MaxPermSize\u5206\u914d\u8fc7\u5c0f\u4f1a\u5bfc\u81f4\uff1ajava.lang.OutOfMemoryError: PermGen space\u3002<\/li>\n<li>MaxPermSize\u7f3a\u7701\u503c\u548c-server -client\u9009\u9879\u76f8\u5173\uff1a-server\u9009\u9879\u4e0b\u9ed8\u8ba4MaxPermSize\u4e3a64m\u3001-client\u9009\u9879\u4e0b\u9ed8\u8ba4MaxPermSize\u4e3a32m\u3002<\/li>\n<\/ol>\n<ul>\n<li>\u7533\u8bf7\u4e00\u5757\u5185\u5b58\u7684\u8fc7\u7a0b<\/li>\n<\/ul>\n<ol>\n<li>JVM\u4f1a\u8bd5\u56fe\u4e3a\u76f8\u5173Java\u5bf9\u8c61\u5728Eden\u4e2d\u521d\u59cb\u5316\u4e00\u5757\u5185\u5b58\u533a\u57df<\/li>\n<li>\u5f53Eden\u7a7a\u95f4\u8db3\u591f\u65f6\uff0c\u5185\u5b58\u7533\u8bf7\u7ed3\u675f\u3002\u5426\u5219\u5230\u4e0b\u4e00\u6b65<\/li>\n<li>JVM\u8bd5\u56fe\u91ca\u653e\u5728Eden\u4e2d\u6240\u6709\u4e0d\u6d3b\u8dc3\u7684\u5bf9\u8c61\uff08\u8fd9\u5c5e\u4e8e1\u6216\u66f4\u9ad8\u7ea7\u7684\u5783\u573e\u56de\u6536\uff09\uff1b\u91ca\u653e\u540e\u82e5Eden\u7a7a\u95f4\u4ecd\u7136\u4e0d\u8db3\u4ee5\u653e\u5165\u65b0\u5bf9\u8c61\uff0c\u5219\u8bd5\u56fe\u5c06\u90e8\u5206Eden\u4e2d\u6d3b\u8dc3\u5bf9\u8c61\u653e\u5165Survivor\u533a\/OLD\u533a<\/li>\n<li>Survivor\u533a\u88ab\u7528\u6765\u4f5c\u4e3aEden\u53caOLD\u7684\u4e2d\u95f4\u4ea4\u6362\u533a\u57df\uff0c\u5f53OLD\u533a\u7a7a\u95f4\u8db3\u591f\u65f6\uff0cSurvivor\u533a\u7684\u5bf9\u8c61\u4f1a\u88ab\u79fb\u5230Old\u533a\uff0c\u5426\u5219\u4f1a\u88ab\u4fdd\u7559\u5728Survivor\u533a<\/li>\n<li>\u5f53OLD\u533a\u7a7a\u95f4\u4e0d\u591f\u65f6\uff0cJVM\u4f1a\u5728OLD\u533a\u8fdb\u884c\u5b8c\u5168\u7684\u5783\u573e\u6536\u96c6\uff080\u7ea7\uff09<\/li>\n<li>\u5b8c\u5168\u5783\u573e\u6536\u96c6\u540e\uff0c\u82e5Survivor\u53caOLD\u533a\u4ecd\u7136\u65e0\u6cd5\u5b58\u653e\u4eceEden\u590d\u5236\u8fc7\u6765\u7684\u90e8\u5206\u5bf9\u8c61\uff0c\u5bfc\u81f4JVM\u65e0\u6cd5\u5728Eden\u533a\u4e3a\u65b0\u5bf9\u8c61\u521b\u5efa\u5185\u5b58\u533a\u57df\uff0c\u5219\u51fa\u73b0\u201dout of memory\u9519\u8bef\u201d<\/li>\n<\/ol>\n<p>resin\u670d\u52a1\u5668\u5178\u578b\u7684\u54cd\u5e94\u65f6\u95f4\u4f18\u5148\u578b\u7684jvm\u914d\u7f6e\uff1a<\/p>\n<div>\n<div id=\"highlighter_13727\" class=\"syntaxhighlighter notranslate java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">1<\/div>\n<div class=\"line number2 index1 alt1\">2<\/div>\n<div class=\"line number3 index2 alt2\">3<\/div>\n<div class=\"line number4 index3 alt1\">4<\/div>\n<div class=\"line number5 index4 alt2\">5<\/div>\n<div class=\"line number6 index5 alt1\">6<\/div>\n<div class=\"line number7 index6 alt2\">7<\/div>\n<div class=\"line number8 index7 alt1\">8<\/div>\n<div class=\"line number9 index8 alt2\">9<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<div class=\"line number20 index19 alt1\">20<\/div>\n<div class=\"line number21 index20 alt2\">21<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java plain\">-Xmx2000M -Xms2000M -Xmn500M<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java plain\">-XX:PermSize=250M -XX:MaxPermSize=250M<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java plain\">-Xss256K<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java plain\">-XX:+DisableExplicitGC<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java plain\">-XX:SurvivorRatio=<\/code><code class=\"java value\">1<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java plain\">-XX:+UseConcMarkSweepGC<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java plain\">-XX:+UseParNewGC<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java plain\">-XX:+CMSParallelRemarkEnabled<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java plain\">-XX:+UseCMSCompactAtFullCollection<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java plain\">-XX:CMSFullGCsBeforeCompaction=<\/code><code class=\"java value\">0<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java plain\">-XX:+CMSClassUnloadingEnabled<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java plain\">-XX:LargePageSizeInBytes=128M<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java plain\">-XX:+UseFastAccessorMethods<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java plain\">-XX:+UseCMSInitiatingOccupancyOnly<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java plain\">-XX:CMSInitiatingOccupancyFraction=<\/code><code class=\"java value\">60<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java plain\">-XX:SoftRefLRUPolicyMSPerMB=<\/code><code class=\"java value\">0<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java plain\">-XX:+PrintClassHistogram<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java plain\">-XX:+PrintGCDetails<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java plain\">-XX:+PrintGCTimeStamps<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java plain\">-XX:+PrintHeapAtGC<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"java plain\">-Xloggc:log\/gc.log<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h2>\u5185\u5b58\u56de\u6536\u7b97\u6cd5<\/h2>\n<p>Java\u4e2d\u6709\u56db\u79cd\u4e0d\u540c\u7684\u56de\u6536\u7b97\u6cd5\uff0c\u5bf9\u5e94\u7684\u542f\u52a8\u53c2\u6570\u4e3a:<\/p>\n<div>\n<div id=\"highlighter_413622\" class=\"syntaxhighlighter notranslate java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">1<\/div>\n<div class=\"line number2 index1 alt1\">2<\/div>\n<div class=\"line number3 index2 alt2\">3<\/div>\n<div class=\"line number4 index3 alt1\">4<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java plain\">\u2013XX:+UseSerialGC<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java plain\">\u2013XX:+UseParallelGC<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java plain\">\u2013XX:+UseParallelOldGC<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java plain\">\u2013XX:+UseConcMarkSweepGC<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3>Serial Collector<\/h3>\n<p>\u5927\u90e8\u5206\u5e73\u53f0\u6216\u8005\u5f3a\u5236 java -client \u9ed8\u8ba4\u4f1a\u4f7f\u7528\u8fd9\u79cd\u3002<\/p>\n<p>young generation\u7b97\u6cd5 = serial<\/p>\n<p>old generation\u7b97\u6cd5 = serial (mark-sweep-compact)<\/p>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u7f3a\u70b9\u5f88\u660e\u663e, stop-the-world, \u901f\u5ea6\u6162\u3002\u670d\u52a1\u5668\u5e94\u7528\u4e0d\u63a8\u8350\u4f7f\u7528\u3002<\/p>\n<h3>Parallel Collector<\/h3>\n<p>\u5728linux x64\u4e0a\u9ed8\u8ba4\u662f\u8fd9\u79cd\uff0c\u5176\u4ed6\u5e73\u53f0\u8981\u52a0 java -server \u53c2\u6570\u624d\u4f1a\u9ed8\u8ba4\u9009\u7528\u8fd9\u79cd\u3002<\/p>\n<p>young = parallel\uff0c\u591a\u4e2athread\u540c\u65f6copy<\/p>\n<p>old = mark-sweep-compact = 1<\/p>\n<p>\u4f18\u70b9\uff1a\u65b0\u751f\u4ee3\u56de\u6536\u66f4\u5feb\u3002\u56e0\u4e3a\u7cfb\u7edf\u5927\u90e8\u5206\u65f6\u95f4\u505a\u7684gc\u90fd\u662f\u65b0\u751f\u4ee3\u7684\uff0c\u8fd9\u6837\u63d0\u9ad8\u4e86throughput(cpu\u7528\u4e8e\u975egc\u65f6\u95f4)<\/p>\n<p>\u7f3a\u70b9\uff1a\u5f53\u8fd0\u884c\u57288G\/16G server\u4e0aold generation live object\u592a\u591a\u65f6\u5019pause time\u8fc7\u957f<\/p>\n<h3>Parallel Compact Collector (ParallelOld)<\/h3>\n<p>young = parallel = 2<\/p>\n<p>old = parallel\uff0c\u5206\u6210\u591a\u4e2a\u72ec\u7acb\u7684\u5355\u5143\uff0c\u5982\u679c\u5355\u5143\u4e2dlive object\u5c11\u5219\u56de\u6536\uff0c\u591a\u5219\u8df3\u8fc7<\/p>\n<p>\u4f18\u70b9\uff1aold old generation\u4e0a\u6027\u80fd\u8f83 parallel \u65b9\u5f0f\u6709\u63d0\u9ad8<\/p>\n<p>\u7f3a\u70b9\uff1a\u5927\u90e8\u5206server\u7cfb\u7edfold generation\u5185\u5b58\u5360\u7528\u4f1a\u8fbe\u523060%-80%, \u6ca1\u6709\u90a3\u4e48\u591a\u7406\u60f3\u7684\u5355\u5143live object\u5f88\u5c11\u65b9\u4fbf\u8fc5\u901f\u56de\u6536\uff0c\u540c\u65f6compact\u65b9\u9762\u5f00\u9500\u6bd4\u8d77parallel\u5e76\u6ca1\u660e\u663e\u51cf\u5c11\u3002<\/p>\n<h3>Concurrent Mark-Sweep(CMS) Collector<\/h3>\n<p>young generation = parallel collector = 2<\/p>\n<p>old = cms<\/p>\n<p>\u540c\u65f6\u4e0d\u505a compact \u64cd\u4f5c\u3002<\/p>\n<p>\u4f18\u70b9\uff1apause time\u4f1a\u964d\u4f4e, pause\u654f\u611f\u4f46CPU\u6709\u7a7a\u95f2\u7684\u573a\u666f\u9700\u8981\u5efa\u8bae\u4f7f\u7528\u7b56\u75654.<\/p>\n<p>\u7f3a\u70b9\uff1acpu\u5360\u7528\u8fc7\u591a\uff0ccpu\u5bc6\u96c6\u578b\u670d\u52a1\u5668\u4e0d\u9002\u5408\u3002\u53e6\u5916\u788e\u7247\u592a\u591a\uff0c\u6bcf\u4e2aobject\u7684\u5b58\u50a8\u90fd\u8981\u901a\u8fc7\u94fe\u8868\u8fde\u7eed\u8df3n\u4e2a\u5730\u65b9\uff0c\u7a7a\u95f4\u6d6a\u8d39\u95ee\u9898\u4e5f\u4f1a\u589e\u5927\u3002<\/p>\n<h2>\u5185\u5b58\u76d1\u63a7\u65b9\u6cd5<\/h2>\n<ul>\n<li>jmap -heap \u67e5\u770bjava \u5806\uff08heap\uff09\u4f7f\u7528\u60c5\u51b5<\/li>\n<\/ul>\n<div>\n<div id=\"highlighter_969646\" class=\"syntaxhighlighter notranslate java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">1<\/div>\n<div class=\"line number2 index1 alt1\">2<\/div>\n<div class=\"line number3 index2 alt2\">3<\/div>\n<div class=\"line number4 index3 alt1\">4<\/div>\n<div class=\"line number5 index4 alt2\">5<\/div>\n<div class=\"line number6 index5 alt1\">6<\/div>\n<div class=\"line number7 index6 alt2\">7<\/div>\n<div class=\"line number8 index7 alt1\">8<\/div>\n<div class=\"line number9 index8 alt2\">9<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<div class=\"line number20 index19 alt1\">20<\/div>\n<div class=\"line number21 index20 alt2\">21<\/div>\n<div class=\"line number22 index21 alt1\">22<\/div>\n<div class=\"line number23 index22 alt2\">23<\/div>\n<div class=\"line number24 index23 alt1\">24<\/div>\n<div class=\"line number25 index24 alt2\">25<\/div>\n<div class=\"line number26 index25 alt1\">26<\/div>\n<div class=\"line number27 index26 alt2\">27<\/div>\n<div class=\"line number28 index27 alt1\">28<\/div>\n<div class=\"line number29 index28 alt2\">29<\/div>\n<div class=\"line number30 index29 alt1\">30<\/div>\n<div class=\"line number31 index30 alt2\">31<\/div>\n<div class=\"line number32 index31 alt1\">32<\/div>\n<div class=\"line number33 index32 alt2\">33<\/div>\n<div class=\"line number34 index33 alt1\">34<\/div>\n<div class=\"line number35 index34 alt2\">35<\/div>\n<div class=\"line number36 index35 alt1\">36<\/div>\n<div class=\"line number37 index36 alt2\">37<\/div>\n<div class=\"line number38 index37 alt1\">38<\/div>\n<div class=\"line number39 index38 alt2\">39<\/div>\n<div class=\"line number40 index39 alt1\">40<\/div>\n<div class=\"line number41 index40 alt2\">41<\/div>\n<div class=\"line number42 index41 alt1\">42<\/div>\n<div class=\"line number43 index42 alt2\">43<\/div>\n<div class=\"line number44 index43 alt1\">44<\/div>\n<div class=\"line number45 index44 alt2\">45<\/div>\n<div class=\"line number46 index45 alt1\">46<\/div>\n<div class=\"line number47 index46 alt2\">47<\/div>\n<div class=\"line number48 index47 alt1\">48<\/div>\n<div class=\"line number49 index48 alt2\">49<\/div>\n<div class=\"line number50 index49 alt1\">50<\/div>\n<div class=\"line number51 index50 alt2\">51<\/div>\n<div class=\"line number52 index51 alt1\">52<\/div>\n<div class=\"line number53 index52 alt2\">53<\/div>\n<div class=\"line number54 index53 alt1\">54<\/div>\n<div class=\"line number55 index54 alt2\">55<\/div>\n<div class=\"line number56 index55 alt1\">56<\/div>\n<div class=\"line number57 index56 alt2\">57<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java plain\">jmap -heap pid <\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java plain\">using thread-local object allocation.<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java plain\">Parallel GC with <\/code><code class=\"java value\">4<\/code> <code class=\"java plain\">thread(s)\u00a0\u00a0 #GC \u65b9\u5f0f<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java plain\">Heap Configuration:\u00a0 #\u5806\u5185\u5b58\u521d\u59cb\u5316\u914d\u7f6e<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java plain\">MinHeapFreeRatio=<\/code><code class=\"java value\">40<\/code>\u00a0 <code class=\"java plain\">#\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:MinHeapFreeRatio\u8bbe\u7f6eJVM\u5806\u6700\u5c0f\u7a7a\u95f2\u6bd4\u7387(<\/code><code class=\"java keyword\">default<\/code> <code class=\"java value\">40<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java plain\">MaxHeapFreeRatio=<\/code><code class=\"java value\">70<\/code>\u00a0 <code class=\"java plain\">#\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570 -XX:MaxHeapFreeRatio\u8bbe\u7f6eJVM\u5806\u6700\u5927\u7a7a\u95f2\u6bd4\u7387(<\/code><code class=\"java keyword\">default<\/code> <code class=\"java value\">70<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java plain\">MaxHeapSize=<\/code><code class=\"java value\">512<\/code><code class=\"java plain\">.0MB\u00a0 #\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:MaxHeapSize=\u8bbe\u7f6eJVM\u5806\u7684\u6700\u5927\u5927\u5c0f<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java plain\">NewSize\u00a0 = <\/code><code class=\"java value\">1<\/code><code class=\"java plain\">.0MB\u00a0\u00a0\u00a0\u00a0 #\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:NewSize=\u8bbe\u7f6eJVM\u5806\u7684\u2018\u65b0\u751f\u4ee3\u2019\u7684\u9ed8\u8ba4\u5927\u5c0f<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java plain\">MaxNewSize =4095MB\u00a0\u00a0 #\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:MaxNewSize=\u8bbe\u7f6eJVM\u5806\u7684\u2018\u65b0\u751f\u4ee3\u2019\u7684\u6700\u5927\u5927\u5c0f<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java plain\">OldSize\u00a0 = <\/code><code class=\"java value\">4<\/code><code class=\"java plain\">.0MB\u00a0\u00a0\u00a0\u00a0 #\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:OldSize=&lt;value&gt;:\u8bbe\u7f6eJVM\u5806\u7684\u2018\u8001\u751f\u4ee3\u2019\u7684\u5927\u5c0f<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java plain\">NewRatio\u00a0 = <\/code><code class=\"java value\">8<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <code class=\"java plain\">#\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:NewRatio=:\u2018\u65b0\u751f\u4ee3\u2019\u548c\u2018\u8001\u751f\u4ee3\u2019\u7684\u5927\u5c0f\u6bd4\u7387<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java plain\">SurvivorRatio = <\/code><code class=\"java value\">8<\/code>\u00a0\u00a0\u00a0 <code class=\"java plain\">#\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:SurvivorRatio=\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u4e2dEden\u533a\u4e0eSurvivor\u533a\u7684\u5927\u5c0f\u6bd4\u503c<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java plain\">PermSize= <\/code><code class=\"java value\">16<\/code><code class=\"java plain\">.0MB\u00a0\u00a0\u00a0\u00a0 #\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:PermSize=&lt;value&gt;:\u8bbe\u7f6eJVM\u5806\u7684\u2018\u6c38\u751f\u4ee3\u2019\u7684\u521d\u59cb\u5927\u5c0f<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java plain\">MaxPermSize=<\/code><code class=\"java value\">64<\/code><code class=\"java plain\">.0MB\u00a0\u00a0 #\u5bf9\u5e94jvm\u542f\u52a8\u53c2\u6570-XX:MaxPermSize=&lt;value&gt;:\u8bbe\u7f6eJVM\u5806\u7684\u2018\u6c38\u751f\u4ee3\u2019\u7684\u6700\u5927\u5927\u5c0f<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java plain\">Heap Usage:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 #\u5806\u5185\u5b58\u5206\u6b65<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"java plain\">PS Young Generation<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number24 index23 alt1\"><code class=\"java plain\">Eden Space:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 #Eden\u533a\u5185\u5b58\u5206\u5e03<\/code><\/div>\n<div class=\"line number25 index24 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number26 index25 alt1\"><code class=\"java plain\">capacity = <\/code><code class=\"java value\">20381696<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">19<\/code><code class=\"java plain\">.4375MB)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 #Eden\u533a\u603b\u5bb9\u91cf<\/code><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"java plain\">used\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">20370032<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">19<\/code><code class=\"java plain\">.426376342773438MB)\u00a0 #Eden\u533a\u5df2\u4f7f\u7528<\/code><\/div>\n<div class=\"line number28 index27 alt1\"><code class=\"java plain\">free\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">11664<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">0<\/code><code class=\"java plain\">.0111236572265625MB)\u00a0\u00a0\u00a0\u00a0 #Eden\u533a\u5269\u4f59\u5bb9\u91cf<\/code><\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"java value\">99.94277218147106<\/code><code class=\"java plain\">% used\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 #Eden\u533a\u4f7f\u7528\u6bd4\u7387<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"java plain\">From Space:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 #\u5176\u4e2d\u4e00\u4e2aSurvivor\u533a\u7684\u5185\u5b58\u5206\u5e03<\/code><\/div>\n<div class=\"line number32 index31 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number33 index32 alt2\"><code class=\"java plain\">capacity = <\/code><code class=\"java value\">8519680<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">8<\/code><code class=\"java plain\">.125MB)<\/code><\/div>\n<div class=\"line number34 index33 alt1\"><code class=\"java plain\">used\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">32768<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">0<\/code><code class=\"java plain\">.03125MB)<\/code><\/div>\n<div class=\"line number35 index34 alt2\"><code class=\"java plain\">free\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">8486912<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">8<\/code><code class=\"java plain\">.09375MB)<\/code><\/div>\n<div class=\"line number36 index35 alt1\"><code class=\"java value\">0.38461538461538464<\/code><code class=\"java plain\">% used<\/code><\/div>\n<div class=\"line number37 index36 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number38 index37 alt1\"><code class=\"java plain\">To Space:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 #\u53e6\u4e00\u4e2aSurvivor\u533a\u7684\u5185\u5b58\u5206\u5e03<\/code><\/div>\n<div class=\"line number39 index38 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number40 index39 alt1\"><code class=\"java plain\">capacity = <\/code><code class=\"java value\">9306112<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">8<\/code><code class=\"java plain\">.875MB)<\/code><\/div>\n<div class=\"line number41 index40 alt2\"><code class=\"java plain\">used\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">0<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">0<\/code><code class=\"java plain\">.0MB)<\/code><\/div>\n<div class=\"line number42 index41 alt1\"><code class=\"java plain\">free\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">9306112<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">8<\/code><code class=\"java plain\">.875MB)<\/code><\/div>\n<div class=\"line number43 index42 alt2\"><code class=\"java value\">0.0<\/code><code class=\"java plain\">% used<\/code><\/div>\n<div class=\"line number44 index43 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number45 index44 alt2\"><code class=\"java plain\">PS Old Generation\u00a0 #\u5f53\u524d\u7684Old\u533a\u5185\u5b58\u5206\u5e03<\/code><\/div>\n<div class=\"line number46 index45 alt1\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number47 index46 alt2\"><code class=\"java plain\">capacity = <\/code><code class=\"java value\">366280704<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">349<\/code><code class=\"java plain\">.3125MB)<\/code><\/div>\n<div class=\"line number48 index47 alt1\"><code class=\"java plain\">used\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">322179848<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">307<\/code><code class=\"java plain\">.25464630126953MB)<\/code><\/div>\n<div class=\"line number49 index48 alt2\"><code class=\"java plain\">free\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">44100856<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">42<\/code><code class=\"java plain\">.05785369873047MB)<\/code><\/div>\n<div class=\"line number50 index49 alt1\"><code class=\"java value\">87.95982001825573<\/code><code class=\"java plain\">% used<\/code><\/div>\n<div class=\"line number51 index50 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number52 index51 alt1\"><code class=\"java plain\">PS Perm Generation #\u5f53\u524d\u7684 \u201c\u6c38\u751f\u4ee3\u201d \u5185\u5b58\u5206\u5e03<\/code><\/div>\n<div class=\"line number53 index52 alt2\"><code class=\"java spaces\">\u00a0<\/code><\/div>\n<div class=\"line number54 index53 alt1\"><code class=\"java plain\">capacity = <\/code><code class=\"java value\">32243712<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">30<\/code><code class=\"java plain\">.75MB)<\/code><\/div>\n<div class=\"line number55 index54 alt2\"><code class=\"java plain\">used\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">28918584<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">27<\/code><code class=\"java plain\">.57891082763672MB)<\/code><\/div>\n<div class=\"line number56 index55 alt1\"><code class=\"java plain\">free\u00a0\u00a0\u00a0\u00a0 = <\/code><code class=\"java value\">3325128<\/code> <code class=\"java plain\">(<\/code><code class=\"java value\">3<\/code><code class=\"java plain\">.1710891723632812MB)<\/code><\/div>\n<div class=\"line number57 index56 alt2\"><code class=\"java value\">89.68751488662348<\/code><code class=\"java plain\">% used<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<ul>\n<li>JVM\u5185\u5b58\u76d1\u63a7\u5de5\u5177<\/li>\n<\/ul>\n<div>\n<div id=\"highlighter_163729\" class=\"syntaxhighlighter notranslate java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">1<\/div>\n<div class=\"line number2 index1 alt1\">2<\/div>\n<div class=\"line number3 index2 alt2\">3<\/div>\n<div class=\"line number4 index3 alt1\">4<\/div>\n<div class=\"line number5 index4 alt2\">5<\/div>\n<div class=\"line number6 index5 alt1\">6<\/div>\n<div class=\"line number7 index6 alt2\">7<\/div>\n<div class=\"line number8 index7 alt1\">8<\/div>\n<div class=\"line number9 index8 alt2\">9<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<div class=\"line number20 index19 alt1\">20<\/div>\n<div class=\"line number21 index20 alt2\">21<\/div>\n<div class=\"line number22 index21 alt1\">22<\/div>\n<div class=\"line number23 index22 alt2\">23<\/div>\n<div class=\"line number24 index23 alt1\">24<\/div>\n<div class=\"line number25 index24 alt2\">25<\/div>\n<div class=\"line number26 index25 alt1\">26<\/div>\n<div class=\"line number27 index26 alt2\">27<\/div>\n<div class=\"line number28 index27 alt1\">28<\/div>\n<div class=\"line number29 index28 alt2\">29<\/div>\n<div class=\"line number30 index29 alt1\">30<\/div>\n<div class=\"line number31 index30 alt2\">31<\/div>\n<div class=\"line number32 index31 alt1\">32<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java plain\">&lt;%@ page <\/code><code class=\"java keyword\">import<\/code><code class=\"java plain\">=<\/code><code class=\"java string\">\"java.lang.management.*\"<\/code> <code class=\"java plain\">%&gt;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java plain\">&lt;%@ page <\/code><code class=\"java keyword\">import<\/code><code class=\"java plain\">=<\/code><code class=\"java string\">\"java.util.*\"<\/code> <code class=\"java plain\">%&gt;<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java plain\">&lt;html&gt;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java plain\">&lt;head&gt;<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">&lt;title&gt;JVM Memory Monitor&lt;\/title&gt;<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java plain\">&lt;\/head&gt;<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java plain\">&lt;body&gt;<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java plain\">&lt;table border=<\/code><code class=\"java string\">\"0\"<\/code> <code class=\"java plain\">width=<\/code><code class=\"java string\">\"100%\"<\/code><code class=\"java plain\">&gt;<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td colspan=<\/code><code class=\"java string\">\"2\"<\/code> <code class=\"java plain\">align=<\/code><code class=\"java string\">\"center\"<\/code><code class=\"java plain\">&gt;&lt;h3&gt;Memory MXBean&lt;\/h3&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td width=<\/code><code class=\"java string\">\"200\"<\/code><code class=\"java plain\">&gt;Heap Memory Usage&lt;\/td&gt;&lt;td&gt;&lt;%=ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()%&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td&gt;Non-Heap Memory Usage&lt;\/td&gt;&lt;td&gt;&lt;%=ManagementFactory.getMemoryMXBean().getNonHeapMemoryUsage()%&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td colspan=<\/code><code class=\"java string\">\"2\"<\/code><code class=\"java plain\">&gt;\u00a0&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td colspan=<\/code><code class=\"java string\">\"2\"<\/code> <code class=\"java plain\">align=<\/code><code class=\"java string\">\"center\"<\/code><code class=\"java plain\">&gt;&lt;h3&gt;Memory Pool MXBeans&lt;\/h3&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java plain\">&lt;%<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">Iterator iter = ManagementFactory.getMemoryPoolMXBeans().iterator();<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">while<\/code> <code class=\"java plain\">(iter.hasNext()) {<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">MemoryPoolMXBean item = (MemoryPoolMXBean) iter.next();<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java plain\">%&gt;<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java plain\">&lt;tr&gt;&lt;td colspan=<\/code><code class=\"java string\">\"2\"<\/code><code class=\"java plain\">&gt;<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;table border=<\/code><code class=\"java string\">\"0\"<\/code> <code class=\"java plain\">width=<\/code><code class=\"java string\">\"100%\"<\/code> <code class=\"java plain\">style=<\/code><code class=\"java string\">\"border: 1px #98AAB1 solid;\"<\/code><code class=\"java plain\">&gt;<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td colspan=<\/code><code class=\"java string\">\"2\"<\/code> <code class=\"java plain\">align=<\/code><code class=\"java string\">\"center\"<\/code><code class=\"java plain\">&gt;&lt;b&gt;&lt;%= item.getName() %&gt;&lt;\/b&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td width=<\/code><code class=\"java string\">\"200\"<\/code><code class=\"java plain\">&gt;Type&lt;\/td&gt;&lt;td&gt;&lt;%= item.getType() %&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td&gt;Usage&lt;\/td&gt;&lt;td&gt;&lt;%= item.getUsage() %&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number24 index23 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td&gt;Peak Usage&lt;\/td&gt;&lt;td&gt;&lt;%= item.getPeakUsage() %&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number25 index24 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;tr&gt;&lt;td&gt;Collection Usage&lt;\/td&gt;&lt;td&gt;&lt;%= item.getCollectionUsage() %&gt;&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number26 index25 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">&lt;\/table&gt;<\/code><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"java plain\">&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number28 index27 alt1\"><code class=\"java plain\">&lt;tr&gt;&lt;td colspan=<\/code><code class=\"java string\">\"2\"<\/code><code class=\"java plain\">&gt;\u00a0&lt;\/td&gt;&lt;\/tr&gt;<\/code><\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"java plain\">&lt;%} %&gt;<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><code class=\"java plain\">&lt;\/table&gt;<\/code><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"java plain\">&lt;\/body&gt;<\/code><\/div>\n<div class=\"line number32 index31 alt1\"><code class=\"java plain\">&lt;\/html&gt;<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5806\u548c\u975e\u5806\u5185\u5b58 \u6309\u7167\u5b98\u65b9\u7684\u8bf4\u6cd5\uff1a\u201cJava \u865a\u62df\u673a\u5177\u6709\u4e00\u4e2a\u5806(Heap)\uff0c\u5806\u662f\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\uff0c\u6240\u6709\u7c7b\u5b9e\u4f8b\u548c\u6570\u7ec4\u7684 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