{"id":15927,"date":"2026-04-26T12:02:05","date_gmt":"2026-04-26T04:02:05","guid":{"rendered":"https:\/\/top.duoku.icu\/libs\/15927.html"},"modified":"2026-04-26T12:02:05","modified_gmt":"2026-04-26T04:02:05","slug":"java-jvm-%e6%80%a7%e8%83%bd%e8%b0%83%e4%bc%98%e8%af%a6%e7%bb%86%e4%bd%bf%e7%94%a8%e6%95%99%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.srclibs.com\/index.php\/2026\/04\/26\/java-jvm-%e6%80%a7%e8%83%bd%e8%b0%83%e4%bc%98%e8%af%a6%e7%bb%86%e4%bd%bf%e7%94%a8%e6%95%99%e7%a8%8b\/","title":{"rendered":"Java JVM \u6027\u80fd\u8c03\u4f18\u8be6\u7ec6\u4f7f\u7528\u6559\u7a0b"},"content":{"rendered":"<div style=\"text-align:center;margin:30px 0;\"><img decoding=\"async\" src=\"https:\/\/top.duoku.icu\/wp-content\/uploads\/2026\/04\/image-91.png\" alt=\"Java JVM \u6027\u80fd\u8c03\u4f18\u8be6\u7ec6\u4f7f\u7528\u6559\u7a0b\" style=\"max-width:100%;height:auto;border-radius:12px;box-shadow:0 4px 12px rgba(0,0,0,0.1);\"><\/div>\n<h1>Java JVM \u6027\u80fd\u8c03\u4f18\u8be6\u7ec6\u4f7f\u7528\u6559\u7a0b<\/h1>\n<h2>JVM \u6027\u80fd\u8c03\u4f18\u6982\u8ff0<\/h2>\n<p>Java JVM \u6027\u80fd\u8c03\u4f18\u662f\u63d0\u5347\u5e94\u7528\u6027\u80fd\u7684\u5173\u952e\u6280\u672f\u3002\u901a\u8fc7\u5408\u7406\u914d\u7f6e JVM \u53c2\u6570\u3001\u4f18\u5316\u5185\u5b58\u7ba1\u7406\u3001\u9009\u62e9\u5408\u9002\u7684\u5783\u573e\u56de\u6536\u5668\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u5347\u5e94\u7528\u7684\u541e\u5410\u91cf\u3001\u964d\u4f4e\u5ef6\u8fdf\u3001\u51cf\u5c11 GC \u505c\u987f\u65f6\u95f4\u3002<\/p>\n<h3>\u4e3a\u4ec0\u4e48\u9700\u8981 JVM \u8c03\u4f18\uff1f<\/h3>\n<ul>\n<li><strong>\u6027\u80fd\u74f6\u9888<\/strong>\uff1aGC \u505c\u987f\u5bfc\u81f4\u5e94\u7528\u54cd\u5e94\u53d8\u6162<\/li>\n<li><strong>\u5185\u5b58\u6cc4\u6f0f<\/strong>\uff1a\u5806\u5185\u5b58\u6ea2\u51fa\uff08OOM\uff09<\/li>\n<li><strong>\u8d44\u6e90\u6d6a\u8d39<\/strong>\uff1a\u4e0d\u5408\u7406\u7684\u5185\u5b58\u5206\u914d\u5bfc\u81f4 CPU \u548c\u5185\u5b58\u6d6a\u8d39<\/li>\n<li><strong>\u7a33\u5b9a\u6027\u95ee\u9898<\/strong>\uff1a\u9891\u7e41 GC \u5f71\u54cd\u7cfb\u7edf\u7a33\u5b9a\u6027<\/li>\n<\/ul>\n<h2>JVM \u5185\u5b58\u6a21\u578b<\/h2>\n<h3>\u5185\u5b58\u533a\u57df\u5212\u5206<\/h3>\n<pre><code>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502           \u65b9\u6cd5\u533a\uff08Method Area\uff09           \u2502\n\u2502  - \u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u6c60\u3001\u9759\u6001\u53d8\u91cf              \u2502\n\u2502  - \u5143\u7a7a\u95f4\uff08Metaspace\uff0cJDK8+\uff09            \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502           \u5806\u5185\u5b58\uff08Heap\uff09                 \u2502\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u2502\n\u2502  \u2502  \u65b0\u751f\u4ee3\uff08Young Generation\uff09        \u2502   \u2502\n\u2502  \u2502  \u251c\u2500 Eden \u7a7a\u95f4\uff08\u5360 80%\uff09             \u2502   \u2502\n\u2502  \u2502  \u251c\u2500 Survivor From\uff08\u5360 10%\uff09         \u2502   \u2502\n\u2502  \u2502  \u2514\u2500 Survivor To\uff08\u5360 10%\uff09           \u2502   \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u2502\n\u2502  \u2502  \u8001\u5e74\u4ee3\uff08Old Generation\uff09           \u2502   \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502           \u6808\u5185\u5b58\uff08Stack\uff09                \u2502\n\u2502  - \u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u52a8\u6001\u94fe\u63a5        \u2502\n\u2502  - \u6bcf\u4e2a\u7ebf\u7a0b\u72ec\u7acb                          \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502           \u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter\uff09  \u2502\n\u2502  - \u8bb0\u5f55\u5f53\u524d\u6267\u884c\u7684\u5b57\u8282\u7801\u6307\u4ee4\u5730\u5740          \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502           \u672c\u5730\u65b9\u6cd5\u6808\uff08Native Stack\uff09     \u2502\n\u2502  - \u6267\u884c Native \u65b9\u6cd5                       \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n<h3>\u5806\u5185\u5b58\u8be6\u89e3<\/h3>\n<p><strong>\u65b0\u751f\u4ee3\uff08Young Generation\uff09<\/strong>\uff1a<\/p>\n<ul>\n<li><strong>Eden \u7a7a\u95f4<\/strong>\uff1a\u5bf9\u8c61\u4f18\u5148\u5206\u914d\u5728\u6b64\u533a\u57df<\/li>\n<li><strong>Survivor \u7a7a\u95f4<\/strong>\uff1a\u5bf9\u8c61\u5b58\u6d3b\u540e\u8fdb\u5165\u6b64\u5904\uff0c\u7ecf\u5386\u591a\u6b21 GC \u4ecd\u672a\u56de\u6536\u5219\u664b\u5347<\/li>\n<li><strong>Minor GC<\/strong>\uff1a\u6e05\u7406\u65b0\u751f\u4ee3\uff0c\u901f\u5ea6\u5feb\u3001\u9891\u7387\u9ad8<\/li>\n<\/ul>\n<p><strong>\u8001\u5e74\u4ee3\uff08Old Generation\uff09<\/strong>\uff1a<\/p>\n<ul>\n<li><strong>Major GC\/Full GC<\/strong>\uff1a\u6e05\u7406\u8001\u5e74\u4ee3\u548c\u65b0\u751f\u4ee3\uff0c\u901f\u5ea6\u6162\u3001\u9891\u7387\u4f4e<\/li>\n<li><strong>\u664b\u5347\u9608\u503c<\/strong>\uff1a\u5bf9\u8c61\u5e74\u9f84\u8fbe\u5230\u4e00\u5b9a\u503c\u540e\u664b\u5347\u5230\u8001\u5e74\u4ee3<\/li>\n<\/ul>\n<h2>\u5783\u573e\u56de\u6536\u673a\u5236<\/h2>\n<h3>\u5783\u573e\u6536\u96c6\u7b97\u6cd5<\/h3>\n<table border=\"1\" cellpadding=\"5\">\n<tr>\n<th>\u7b97\u6cd5<\/th>\n<th>\u539f\u7406<\/th>\n<th>\u7279\u70b9<\/th>\n<th>\u9002\u7528\u573a\u666f<\/th>\n<\/tr>\n<tr>\n<td>\u6807\u8bb0 &#8211; \u6e05\u9664<\/td>\n<td>\u6807\u8bb0\u5b58\u6d3b\u5bf9\u8c61\uff0c\u6e05\u9664\u672a\u5b58\u6d3b<\/td>\n<td>\u6709\u788e\u7247<\/td>\n<td>\u8001\u5e74\u4ee3<\/td>\n<\/tr>\n<tr>\n<td>\u6807\u8bb0 &#8211; \u590d\u5236<\/td>\n<td>\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u533a\u57df<\/td>\n<td>\u65e0\u788e\u7247\uff0c\u7a7a\u95f4\u6d6a\u8d39<\/td>\n<td>\u65b0\u751f\u4ee3<\/td>\n<\/tr>\n<tr>\n<td>\u6807\u8bb0 &#8211; \u6574\u7406<\/td>\n<td>\u6807\u8bb0\u540e\u5411\u4e00\u7aef\u79fb\u52a8<\/td>\n<td>\u65e0\u788e\u7247<\/td>\n<td>\u8001\u5e74\u4ee3<\/td>\n<\/tr>\n<\/table>\n<h3>\u4e3b\u6d41\u5783\u573e\u56de\u6536\u5668<\/h3>\n<p>| \u56de\u6536\u5668 | \u7279\u70b9 | \u9002\u7528\u573a\u666f |<br \/>\n|&#8212;&#8212;&#8211;|&#8212;&#8212;|&#8212;&#8212;&#8212;|<br \/>\n| <strong>Serial<\/strong> | \u5355\u7ebf\u7a0b\u3001\u6807\u8bb0 &#8211; \u590d\u5236 | \u5ba2\u6237\u7aef\u5e94\u7528\u3001\u5c0f\u5185\u5b58 |<br \/>\n| <strong>Parallel Scavenge<\/strong> | \u591a\u7ebf\u7a0b\u3001\u541e\u5410\u91cf\u4f18\u5148 | \u540e\u53f0\u8ba1\u7b97\u4efb\u52a1 |<br \/>\n| <strong>Parallel Old<\/strong> | \u591a\u7ebf\u7a0b\u3001\u6807\u8bb0 &#8211; \u6574\u7406 | \u914d\u5408 Parallel Scavenge |<br \/>\n| <strong>CMS<\/strong> | \u4f4e\u5ef6\u8fdf\u3001\u6807\u8bb0 &#8211; \u6e05\u9664 | \u5bf9\u54cd\u5e94\u65f6\u95f4\u654f\u611f |<br \/>\n| <strong>G1<\/strong> | \u5206\u533a\u3001\u53ef\u9884\u6d4b\u505c\u987f | \u5927\u5185\u5b58\u3001\u591a\u6838 |<br \/>\n| <strong>ZGC<\/strong> | \u8d85\u4f4e\u5ef6\u8fdf\u3001\u53ef\u6269\u5c55 | \u8d85\u5927\u5185\u5b58\u3001\u4f4e\u5ef6\u8fdf\u8981\u6c42 |<\/p>\n<h3>GC \u53c2\u6570\u9009\u62e9\u5efa\u8bae<\/h3>\n<pre><code># \u541e\u5410\u91cf\u4f18\u5148\uff08\u540e\u53f0\u4efb\u52a1\uff09\n-XX:+UseParallelGC -XX:MaxGCPauseMillis=200\n\n<h1>\u4f4e\u5ef6\u8fdf\u4f18\u5148\uff08Web \u670d\u52a1\uff09<\/h1>\n-XX:+UseG1GC -XX:MaxGCPauseMillis=200\n\n<h1>\u8d85\u4f4e\u5ef6\u8fdf\uff08\u91d1\u878d\u4ea4\u6613\uff09<\/h1>\n-XX:+UseZGC -XX:ZCollectionInterval=5\n\n<h1>\u5c0f\u5185\u5b58\u5e94\u7528<\/h1>\n-XX:+UseSerialGC\n<\/code><\/pre>\n<h2>JVM \u5e38\u7528\u8c03\u4f18\u53c2\u6570<\/h2>\n<h3>\u5806\u5185\u5b58\u8bbe\u7f6e<\/h3>\n<pre><code># \u521d\u59cb\u5806\u5927\u5c0f\n-Xms4g\n\n<h1>\u6700\u5927\u5806\u5927\u5c0f\uff08\u901a\u5e38\u4e0e\u521d\u59cb\u503c\u76f8\u540c\u907f\u514d\u6269\u5bb9\uff09<\/h1>\n-Xmx4g\n\n<h1>\u65b0\u751f\u4ee3\u5927\u5c0f<\/h1>\n-XX:NewSize=1g\n\n<h1>\u65b0\u751f\u4ee3\u6700\u5927\u5927\u5c0f<\/h1>\n-XX:MaxNewSize=1g\n\n<h1>\u65b0\u751f\u4ee3\u4e0e\u8001\u5e74\u4ee3\u6bd4\u4f8b<\/h1>\n-XX:NewRatio=2  # \u8001\u5e74\u4ee3\uff1a\u65b0\u751f\u4ee3 = 2:1\n\n<h1>Eden \u4e0e Survivor \u6bd4\u4f8b<\/h1>\n-XX:SurvivorRatio=8  # Eden:Survivor = 8:1\n<\/code><\/pre>\n<h3>\u5783\u573e\u56de\u6536\u5668\u914d\u7f6e<\/h3>\n<pre><code># G1 \u56de\u6536\u5668\n-XX:+UseG1GC\n\n<h1>G1 \u533a\u57df\u5927\u5c0f\uff082^N\uff0c\u9ed8\u8ba4\u662f\u5806\u5185\u5b58\u7684 1\/2048\uff09<\/h1>\n-XX:G1ReservePercent=10\n-XX:G1HeapRegionSize=16m\n\n<h1>CMS \u56de\u6536\u5668<\/h1>\n-XX:+UseConcMarkSweepGC\n\n<h1>CMS \u5e76\u53d1\u7ebf\u7a0b\u6570<\/h1>\n-XX:ConcGCThreads=4\n\n<h1>\u5806\u5185\u5b58\u6ea2\u51fa\u65f6dump\u5806\u5185\u5b58<\/h1>\n-XX:+HeapDumpOnOutOfMemoryError\n\n<h1>Heap dump \u6587\u4ef6\u8def\u5f84<\/h1>\n-XX:HeapDumpPath=\/data\/hprof\/\n<\/code><\/pre>\n<h3>\u5176\u4ed6\u5173\u952e\u53c2\u6570<\/h3>\n<pre><code># \u5143\u7a7a\u95f4\u5927\u5c0f\n-XX:MetaspaceSize=256m\n-XX:MaxMetaspaceSize=512m\n\n<h1>\u6808\u5185\u5b58\u5927\u5c0f<\/h1>\n-Xss256k\n\n<h1>\u5f00\u542f GC \u65e5\u5fd7<\/h1>\n-XX:+PrintGCDetails -XX:+PrintGCDateStamps\n\n<h1>GC \u65e5\u5fd7\u8def\u5f84<\/h1>\n-Xloggc:\/data\/gc.log\n\n<h1>\u5173\u95ed\u6307\u9488\u538b\u7f29\uff0864 \u4f4d JVM\uff09<\/h1>\n-XX:-UseCompressedOops\n<\/code><\/pre>\n<h2>\u6027\u80fd\u76d1\u63a7\u5de5\u5177<\/h2>\n<h3>1. JConsole<\/h3>\n<p>JConsole \u662f JDK \u81ea\u5e26\u7684\u56fe\u5f62\u5316\u76d1\u63a7\u5de5\u5177\uff1a<\/p>\n<pre><code># \u542f\u52a8 JConsole\njconsole\n\n<h1>\u672c\u5730\u8fde\u63a5\uff1alocalhost:7777<\/h1>\n<h1>\u8fdc\u7a0b\u8fde\u63a5\uff1ahostname:port<\/h1>\n<\/code><\/pre>\n<p><strong>\u76d1\u63a7\u6307\u6807<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5185\u5b58\u4f7f\u7528\u91cf\uff08\u5806\u3001\u975e\u5806\uff09<\/li>\n<li>\u7ebf\u7a0b\u72b6\u6001<\/li>\n<li>GC \u6b21\u6570\u548c\u65f6\u95f4<\/li>\n<li>MBean \u5c5e\u6027<\/li>\n<\/ul>\n<h3>2. VisualVM<\/h3>\n<p>VisualVM \u529f\u80fd\u66f4\u5f3a\u5927\u7684\u53ef\u89c6\u5316\u5206\u6790\u5de5\u5177\uff1a<\/p>\n<pre><code># \u542f\u52a8 VisualVM\njvisualvm\n\n<h1>\u6216\u5b89\u88c5\u63d2\u4ef6\u540e\u4f7f\u7528<\/h1>\n<\/code><\/pre>\n<p><strong>\u6838\u5fc3\u529f\u80fd<\/strong>\uff1a<\/p>\n<ul>\n<li>CPU \u5206\u6790\uff1a\u65b9\u6cd5\u8017\u65f6\u5206\u6790<\/li>\n<li>\u5185\u5b58\u5206\u6790\uff1a\u5bf9\u8c61\u5185\u5b58\u5360\u7528\u3001\u6cc4\u6f0f\u68c0\u6d4b<\/li>\n<li>\u7ebf\u7a0b\u5206\u6790\uff1a\u6b7b\u9501\u68c0\u6d4b\u3001\u7ebf\u7a0b\u72b6\u6001<\/li>\n<li>\u5806\u8f6c\u50a8\u5206\u6790<\/li>\n<\/ul>\n<h3>3. JProfiler<\/h3>\n<p>\u5546\u4e1a\u7ea7\u6027\u80fd\u5206\u6790\u5de5\u5177\uff0c\u529f\u80fd\u6700\u5168\u9762\uff1a<\/p>\n<p><strong>\u4f18\u52bf<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5b9e\u65f6\u6027\u80fd\u76d1\u63a7<\/li>\n<li>\u5185\u5b58\u6cc4\u6f0f\u7cbe\u51c6\u5b9a\u4f4d<\/li>\n<li>\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u76d1\u63a7<\/li>\n<li>\u5206\u5e03\u5f0f\u7cfb\u7edf\u5206\u6790<\/li>\n<\/ul>\n<h3>4. GC \u65e5\u5fd7\u5206\u6790\u5de5\u5177<\/h3>\n<pre><code># GC \u65e5\u5fd7\u5206\u6790\u793a\u4f8b\njstat -gc <pid> 1000  # \u6bcf\u79d2\u8f93\u51fa GC \u7edf\u8ba1\n\n<h1>\u67e5\u770b GC \u8be6\u60c5<\/h1>\njstat -gcutil <pid> 1000\n<\/code><\/pre>\n<h3>5. Arthas<\/h3>\n<p>\u963f\u91cc\u5f00\u6e90\u7684\u8bca\u65ad\u5de5\u5177\uff0c\u9002\u5408\u751f\u4ea7\u73af\u5883\uff1a<\/p>\n<pre><code># \u542f\u52a8 Arthas\njava -jar arthas-boot.jar\n\n<h1>\u5e38\u7528\u547d\u4ee4<\/h1>\ndashboard          # \u7cfb\u7edf\u6982\u51b5\nthread             # \u7ebf\u7a0b\u5206\u6790\nmonitor            # \u65b9\u6cd5\u76d1\u63a7\nmemory             # \u5185\u5b58\u5206\u6790\nheapdump           # \u5806\u8f6c\u50a8\n<\/code><\/pre>\n<h2>JVM \u8c03\u4f18\u793a\u4f8b<\/h2>\n<h3>\u573a\u666f\u4e00\uff1aWeb \u5e94\u7528\u8c03\u4f18<\/h3>\n<pre><code># \u4e2d\u7b49\u89c4\u6a21 Web \u5e94\u7528\uff084G \u5185\u5b58\uff09\nJAVA_OPTS=\"-server \\\n-Xms4g -Xmx4g \\\n-XX:NewSize=1g -XX:MaxNewSize=1g \\\n-XX:SurvivorRatio=8 \\\n-XX:+UseG1GC \\\n-XX:MaxGCPauseMillis=200 \\\n-XX:G1HeapRegionSize=16m \\\n-XX:+PrintGCDetails -XX:+PrintGCDateStamps \\\n-Xloggc:\/data\/gc.log \\\n-XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m \\\n-Xss256k \\\n-XX:+HeapDumpOnOutOfMemoryError \\\n-XX:HeapDumpPath=\/data\/hprof\/\"\n<\/code><\/pre>\n<h3>\u573a\u666f\u4e8c\uff1a\u5927\u6570\u636e\u5e94\u7528\u8c03\u4f18<\/h3>\n<pre><code># Spark\/Flink \u5927\u6570\u636e\u5e94\u7528\uff0816G \u5185\u5b58\uff09\nJAVA_OPTS=\"-server \\\n-Xms16g -Xmx16g \\\n-XX:NewRatio=1 \\\n-XX:+UseG1GC \\\n-XX:MaxGCPauseMillis=500 \\\n-XX:G1ReservePercent=15 \\\n-XX:+PrintGCDetails -Xloggc:\/data\/gc.log \\\n-XX:+UseStringDeduplication \\\n-XX:MetaspaceSize=512m \\\n-Xss512k \\\n-XX:+HeapDumpOnOutOfMemoryError\"\n<\/code><\/pre>\n<h3>\u573a\u666f\u4e09\uff1a\u5fae\u670d\u52a1\u5bb9\u5668\u5316\u8c03\u4f18<\/h3>\n<pre><code># Docker\/Kubernetes \u73af\u5883\uff08\u4f7f\u7528\u5bb9\u5668\u611f\u77e5\uff09\nJAVA_OPTS=\"-server \\\n-XX:+UseG1GC \\\n-XX:MaxGCPauseMillis=100 \\\n-XX:+UseContainerSupport \\\n-XX:+UseStringDeduplication \\\n-XX:+HeapDumpOnOutOfMemoryError \\\n-XX:HeapDumpPath=\/tmp\/heapdump.hprof \\\n-Xloggc:\/tmp\/gc.log \\\n-XX:+PrintGCDetails \\\n-XX:+PrintGCDateStamps\"\n<\/code><\/pre>\n<h2>\u6027\u80fd\u8c03\u4f18\u6700\u4f73\u5b9e\u8df5<\/h2>\n<h3>1. \u76d1\u63a7\u5148\u884c<\/h3>\n<pre><code># \u5148\u89c2\u5bdf\u518d\u8c03\u4f18\njstat -gcutil <pid> 1000 100\n\n<h1>\u5206\u6790 GC \u65e5\u5fd7<\/h1>\ngrep \"GC\" gc.log | tail -100\n<\/code><\/pre>\n<h3>2. \u6e10\u8fdb\u5f0f\u8c03\u4f18<\/h3>\n<pre><code># \u7b2c\u4e00\u6b65\uff1a\u786e\u8ba4\u57fa\u7840\u53c2\u6570\n-Xms -Xmx \u8bbe\u7f6e\u76f8\u540c\u503c\uff0c\u907f\u514d\u52a8\u6001\u8c03\u6574\n\n<h1>\u7b2c\u4e8c\u6b65\uff1a\u8c03\u6574\u65b0\u751f\u4ee3\u6bd4\u4f8b<\/h1>\n-XX:NewRatio=2\n\n<h1>\u7b2c\u4e09\u6b65\uff1a\u8c03\u6574 G1 \u53c2\u6570\uff08\u5982\u9700\u8981\uff09<\/h1>\n-XX:MaxGCPauseMillis=200\n<\/code><\/pre>\n<h3>3. \u5173\u6ce8\u5173\u952e\u6307\u6807<\/h3>\n<p>| \u6307\u6807 | \u76ee\u6807\u503c | \u8bf4\u660e |<br \/>\n|&#8212;&#8212;|&#8212;&#8212;-|&#8212;&#8212;|<br \/>\n| \u5806\u4f7f\u7528\u7387 | 60-80% | \u8fc7\u9ad8\u5bb9\u6613 OOM\uff0c\u8fc7\u4f4e\u6d6a\u8d39\u8d44\u6e90 |<br \/>\n| GC \u9891\u7387 | < 10 \u6b21\/\u5206\u949f | \u8fc7\u9ad8\u8bf4\u660e\u5806\u5185\u5b58\u4e0d\u8db3 |\n| Full GC \u65f6\u95f4 | < 500ms | \u8fc7\u9ad8\u5f71\u54cd\u7cfb\u7edf\u54cd\u5e94 |\n| GC \u505c\u987f\u65f6\u95f4 | < 500ms | G1\uff1aMaxGCPauseMillis |\n| \u8001\u5e74\u4ee3\u4f7f\u7528\u7387 | 60-70% | \u8fc7\u9ad8\u5bb9\u6613\u89e6\u53d1 Full GC |\n\n\n\n<h3>4. \u5e38\u89c1\u95ee\u9898\u5904\u7406<\/h3>\n<p><strong>\u95ee\u9898 1\uff1a\u9891\u7e41 Full GC<\/strong><\/p>\n<pre><code># \u8c03\u6574\u664b\u5347\u9608\u503c\n-XX:MaxTenuringThreshold=15\n\n<h1>\u589e\u52a0\u8001\u5e74\u4ee3\u7a7a\u95f4<\/h1>\n-XX:MaxNewSize=2g  # \u51cf\u5c11\u65b0\u751f\u4ee3\uff0c\u76f8\u5bf9\u589e\u52a0\u8001\u5e74\u4ee3\n<\/code><\/pre>\n<p><strong>\u95ee\u9898 2\uff1aOutOfMemoryError<\/strong><\/p>\n<pre><code># \u5206\u6790 Heap Dump \u5b9a\u4f4d\u6cc4\u6f0f\njmap -dump:live,format=b,file=heap.hprof <pid>\n\n<h1>\u589e\u52a0\u5806\u5185\u5b58<\/h1>\n-Xmx8g\n<\/code><\/pre>\n<p><strong>\u95ee\u9898 3\uff1aGC \u505c\u987f\u65f6\u95f4\u8fc7\u957f<\/strong><\/p>\n<pre><code># \u5207\u6362\u5230 G1 \u56de\u6536\u5668\n-XX:+UseG1GC\n-XX:MaxGCPauseMillis=100\n\n<h1>\u6216\u8003\u8651 ZGC\uff08Java 11+\uff09<\/h1>\n-XX:+UseZGC\n<\/code><\/pre>\n<h2>\u5b9e\u9645\u6848\u4f8b\u5206\u6790<\/h2>\n<h3>\u6848\u4f8b\u4e00\uff1a\u7535\u5546\u5927\u4fc3\u8c03\u4f18<\/h3>\n<p><strong>\u95ee\u9898<\/strong>\uff1a\u53cc 11 \u5927\u4fc3\u65f6\u7cfb\u7edf\u9891\u7e41 Full GC\uff0c\u54cd\u5e94\u65f6\u95f4\u8d85\u8fc7 5 \u79d2\u3002<\/p>\n<p><strong>\u5206\u6790<\/strong>\uff1a<\/p>\n<ul>\n<li>\u89c2\u5bdf GC \u65e5\u5fd7\uff1aFull GC \u9891\u7387 3 \u6b21\/\u5206\u949f\uff0c\u6bcf\u6b21\u8017\u65f6 800ms<\/li>\n<li>\u5806\u5185\u5b58\u4f7f\u7528\u7387\u6301\u7eed\u5728 95% \u4ee5\u4e0a<\/li>\n<li>\u8001\u5e74\u4ee3\u5bf9\u8c61\u589e\u957f\u8fc7\u5feb<\/li>\n<\/ul>\n<p><strong>\u8c03\u4f18\u65b9\u6848<\/strong>\uff1a<\/p>\n<pre><code>-Xms16g -Xmx16g\n-XX:NewSize=4g -XX:MaxNewSize=4g\n-XX:+UseG1GC\n-XX:MaxGCPauseMillis=200\n-XX:MaxTenuringThreshold=10\n<\/code><\/pre>\n<p><strong>\u7ed3\u679c<\/strong>\uff1aFull GC \u9891\u7387\u964d\u81f3 1 \u6b21\/\u5c0f\u65f6\uff0c\u54cd\u5e94\u65f6\u95f4\u964d\u81f3 200ms \u4ee5\u5185\u3002<\/p>\n<h3>\u6848\u4f8b\u4e8c\uff1a\u91d1\u878d\u4ea4\u6613\u7cfb\u7edf\u8c03\u4f18<\/h3>\n<p><strong>\u95ee\u9898<\/strong>\uff1a\u9ad8\u9891\u4ea4\u6613\u7cfb\u7edf GC \u505c\u987f\u8d85\u8fc7 100ms\uff0c\u5f71\u54cd\u4ea4\u6613\u5ef6\u8fdf\u3002<\/p>\n<p><strong>\u5206\u6790<\/strong>\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528 Parallel GC\uff0c\u541e\u5410\u91cf\u9ad8\u4f46\u505c\u987f\u65f6\u95f4\u957f<\/li>\n<li>\u5185\u5b58\u5206\u914d\u9891\u7e41\uff0cGC \u538b\u529b\u5927<\/li>\n<\/ul>\n<p><strong>\u8c03\u4f18\u65b9\u6848<\/strong>\uff1a<\/p>\n<pre><code>-XX:+UseZGC\n-XX:+ZCollectionInterval=5\n-XX:+ZPartitionSize=4G\n<\/code><\/pre>\n<p><strong>\u7ed3\u679c<\/strong>\uff1aGC \u505c\u987f\u964d\u81f3 10ms \u4ee5\u5185\uff0c\u6ee1\u8db3\u4f4e\u5ef6\u8fdf\u8981\u6c42\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>JVM \u6027\u80fd\u8c03\u4f18\u662f\u4e00\u4e2a\u7cfb\u7edf\u6027\u7684\u5de5\u7a0b\uff0c\u9700\u8981\uff1a<\/p>\n<ol>\n<li><strong>\u7406\u89e3\u5185\u5b58\u6a21\u578b<\/strong>\uff1a\u638c\u63e1\u5806\u3001\u6808\u3001\u65b9\u6cd5\u533a\u7684\u5206\u914d\u673a\u5236<\/li>\n<li><strong>\u9009\u62e9\u5408\u9002\u56de\u6536\u5668<\/strong>\uff1a\u6839\u636e\u4e1a\u52a1\u7279\u70b9\u9009\u62e9 Serial\u3001Parallel\u3001CMS\u3001G1\u3001ZGC<\/li>\n<li><strong>\u76d1\u63a7\u5206\u6790<\/strong>\uff1a\u719f\u7ec3\u4f7f\u7528 JConsole\u3001VisualVM\u3001Arthas \u7b49\u5de5\u5177<\/li>\n<li><strong>\u6e10\u8fdb\u5f0f\u8c03\u4f18<\/strong>\uff1a\u4ece\u57fa\u7840\u53c2\u6570\u5f00\u59cb\uff0c\u9010\u6b65\u4f18\u5316<\/li>\n<li><strong>\u5173\u6ce8\u5173\u952e\u6307\u6807<\/strong>\uff1a\u5806\u4f7f\u7528\u7387\u3001GC \u9891\u7387\u3001\u505c\u987f\u65f6\u95f4\u7b49<\/li>\n<\/ul>\n<p><strong>\u6838\u5fc3\u5efa\u8bae<\/strong>\uff1a<\/p>\n<ul>\n<li>\u4e0d\u8981\u76f2\u76ee\u8c03\u4f18\uff0c\u5148\u89c2\u5bdf\u518d\u8c03\u6574<\/li>\n<li>\u5173\u6ce8\u4e1a\u52a1\u573a\u666f\uff0c\u4e0d\u540c\u573a\u666f\u9700\u6c42\u4e0d\u540c<\/li>\n<li>\u5145\u5206\u5229\u7528\u76d1\u63a7\u5de5\u5177\uff0c\u6570\u636e\u8bf4\u8bdd<\/li>\n<li>\u6301\u7eed\u4f18\u5316\uff0c\u6839\u636e\u8fd0\u884c\u6570\u636e\u8c03\u6574\u7b56\u7565<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u5408\u7406\u7684 JVM \u8c03\u4f18\uff0c\u53ef\u4ee5\u8ba9 Java \u5e94\u7528\u5728\u6027\u80fd\u3001\u7a33\u5b9a\u6027\u3001\u8d44\u6e90\u5229\u7528\u7387\u4e0a\u8fbe\u5230\u6700\u4f73\u5e73\u8861\u3002<\/p>\n<p>&#8212;<\/p>\n<p><strong>Maven \u4f9d\u8d56\uff08\u76d1\u63a7\u5de5\u5177\uff09<\/strong>\uff1a<br \/>\n&#8220;`xml<br \/>\n<!-- \u963f\u91cc Arthas --><br \/>\n<dependency><br \/>\n    <groupId>com.alibaba<\/groupId><br \/>\n    <artifactId>arthas-core<\/artifactId><br \/>\n    <version>3.7.1<\/version><br \/>\n<\/dependency><br \/>\n&#8220;`<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java JVM \u6027\u80fd\u8c03\u4f18\u8be6\u7ec6\u4f7f\u7528\u6559\u7a0b JVM \u6027\u80fd\u8c03\u4f18\u6982\u8ff0 Java JVM \u6027\u80fd\u8c03\u4f18\u662f\u63d0\u5347\u5e94\u7528\u6027\u80fd\u7684\u5173\u952e\u6280&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-15927","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/posts\/15927","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/comments?post=15927"}],"version-history":[{"count":0,"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/posts\/15927\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/media?parent=15927"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/categories?post=15927"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.srclibs.com\/index.php\/wp-json\/wp\/v2\/tags?post=15927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}