{"id":32636,"date":"2025-03-04T10:32:48","date_gmt":"2025-03-04T02:32:48","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=32636"},"modified":"2025-03-04T10:32:48","modified_gmt":"2025-03-04T02:32:48","slug":"%e5%ba%94%e7%94%a8%e6%95%85%e9%9a%9c%e5%ae%9a%e4%bd%8d%e4%b8%ad%e5%a6%82%e4%bd%95%e5%88%86%e6%9e%90gc%e6%97%a5%e5%bf%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/32636.html","title":{"rendered":"\u5e94\u7528\u6545\u969c\u5b9a\u4f4d\u4e2d\u5982\u4f55\u5206\u6790GC\u65e5\u5fd7\uff1f"},"content":{"rendered":"<p style=\"text-align: center;\">\n<p><img decoding=\"async\" src=\"https:\/\/pic.zadbj010.com\/2025\/ff4a368ad7c1762.jpg\" alt=\"\u5e94\u7528\u6545\u969c\u5b9a\u4f4d\u4e2d\u5982\u4f55\u5206\u6790GC\u65e5\u5fd7\uff1f\" ><\/p>\n<\/p>\n<p>\u5728\u5f53\u4eca\u7684\u9ad8\u5e76\u53d1\u3001\u9ad8\u8d1f\u8f7d\u5e94\u7528\u573a\u666f\u4e2d\uff0c\u7cfb\u7edf\u6027\u80fd\u95ee\u9898\u5e38\u5e38\u50cf\u4e00\u628a\u60ac\u5728\u5f00\u53d1\u8005\u5934\u9876\u7684\u8fbe\u6469\u514b\u5229\u65af\u4e4b\u5251\u3002\u5f53\u5e94\u7528\u51fa\u73b0\u54cd\u5e94\u5ef6\u8fdf\u3001\u9891\u7e41\u5361\u987f\u751a\u81f3\u5d29\u6e83\u65f6\uff0c\u5f88\u591a\u4eba\u7b2c\u4e00\u53cd\u5e94\u662f\u68c0\u67e5\u4ee3\u7801\u903b\u8f91\u6216\u6570\u636e\u5e93\u6027\u80fd\uff0c\u5374\u5f80\u5f80\u5ffd\u7565\u4e86\u4e00\u4e2a\u9690\u85cf\u7684\u5173\u952e\u7ebf\u7d22\u2014\u2014<strong>GC\u65e5\u5fd7<\/strong>\u3002\u4e8b\u5b9e\u4e0a\uff0c\u6839\u636eOracle\u5b98\u65b9\u7edf\u8ba1\uff0c\u8d85\u8fc760%\u7684Java\u5e94\u7528\u6027\u80fd\u95ee\u9898\u4e0e\u5185\u5b58\u7ba1\u7406\u76f4\u63a5\u76f8\u5173\uff0c\u800c\u7cbe\u51c6\u89e3\u8bfbGC\u65e5\u5fd7\u6b63\u662f\u6253\u5f00\u95ee\u9898\u75c7\u7ed3\u7684\u91d1\u94a5\u5319\u3002<\/p>\n<hr>\n<h3 id=\"\u4e00-\u4e3a\u4ec0\u4e48gc\u65e5\u5fd7\u662f\u6545\u969c\u5b9a\u4f4d\u7684-x\u5149\u7247\">\u4e00\u3001\u4e3a\u4ec0\u4e48GC\u65e5\u5fd7\u662f\u6545\u969c\u5b9a\u4f4d\u7684&rdquo;X\u5149\u7247&rdquo;<\/h3>\n<p>Java\u865a\u62df\u673a\u7684\u5783\u573e\u56de\u6536\u673a\u5236\uff08Garbage Collection\uff09\u76f4\u63a5\u5f71\u54cd\u7740\u5e94\u7528\u7684\u541e\u5410\u91cf\u548c\u54cd\u5e94\u65f6\u95f4\u3002<strong>GC\u65e5\u5fd7\u8bb0\u5f55\u4e86\u5185\u5b58\u56de\u6536\u7684\u5b8c\u6574\u751f\u547d\u5468\u671f<\/strong>\uff0c\u5305\u62ecYoung GC\u3001Full GC\u7684\u9891\u7387\u4e0e\u8017\u65f6\u3001\u5185\u5b58\u533a\u57df\u7684\u5206\u914d\u53d8\u5316\u7b49\u6838\u5fc3\u6307\u6807\u3002\u8fd9\u4e9b\u6570\u636e\u5982\u540c\u533b\u7597\u5f71\u50cf\uff0c\u80fd\u76f4\u89c2\u66b4\u9732\u4ee5\u4e0b\u95ee\u9898\uff1a<\/p>\n<ul>\n<li><strong>\u5185\u5b58\u6cc4\u6f0f\u7684\u86db\u4e1d\u9a6c\u8ff9<\/strong>\uff08\u5982\u8001\u5e74\u4ee3\u6301\u7eed\u589e\u957f\uff09\n<\/li>\n<li><strong>\u4e0d\u5408\u7406\u7684\u5806\u5185\u5b58\u914d\u7f6e<\/strong>\uff08\u5982Survivor\u533a\u8fc7\u65e9\u6ea2\u51fa\uff09\n<\/li>\n<li><strong>GC\u7b56\u7565\u4e0e\u4e1a\u52a1\u573a\u666f\u7684\u9519\u914d<\/strong>\uff08\u5982CMS\u4e0e\u9ad8\u541e\u5410\u91cf\u573a\u666f\u7684\u51b2\u7a81\uff09\n<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u5206\u6790\u65e5\u5fd7\u4e2d\u7684<code>[PSYoungGen: 614400K-&gt;81920K]<\/code>\u7c7b\u6570\u636e\uff0c\u53ef\u4ee5\u7cbe\u786e\u8ba1\u7b97\u5185\u5b58\u56de\u6536\u6548\u7387\u3002\u4f8b\u5982\u5f53\u8001\u5e74\u4ee3\u56de\u6536\u540e\u5185\u5b58\u91ca\u653e\u91cf\uff08<code>[ParOldGen: 1024000K-&gt;1024000K]<\/code>\uff09\u957f\u671f\u672a\u53d8\u5316\uff0c\u6781\u53ef\u80fd\u5b58\u5728\u5bf9\u8c61\u672a\u88ab\u6b63\u786e\u91ca\u653e\u3002<\/p>\n<hr>\n<h3 id=\"\u4e8c-gc\u65e5\u5fd7\u5206\u6790\u7684\u4e09\u5927\u6838\u5fc3\u6b65\u9aa4\">\u4e8c\u3001GC\u65e5\u5fd7\u5206\u6790\u7684\u4e09\u5927\u6838\u5fc3\u6b65\u9aa4<\/h3>\n<h4 id=\"1-\u65e5\u5fd7\u91c7\u96c6\u4e0e\u9884\u5904\u7406\">1. \u65e5\u5fd7\u91c7\u96c6\u4e0e\u9884\u5904\u7406<\/h4>\n<p>\u542f\u7528JVM\u53c2\u6570<code>-XX:+PrintGCDetails -Xloggc:\/path\/to\/gc.log<\/code>\u751f\u6210\u8be6\u7ec6\u65e5\u5fd7\u3002\u5bf9\u4e8e\u5bb9\u5668\u5316\u73af\u5883\uff0c\u5efa\u8bae\u8ffd\u52a0<code>-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5<\/code>\u5b9e\u73b0\u65e5\u5fd7\u8f6e\u8f6c\u3002\u4f7f\u7528<strong>GCViewer<\/strong>\u6216<strong>GCEasy<\/strong>\u7b49\u5de5\u5177\u8fdb\u884c\u53ef\u89c6\u5316\u5904\u7406\u65f6\uff0c\u91cd\u70b9\u5173\u6ce8\uff1a<\/p>\n<ul>\n<li><strong>\u541e\u5410\u91cf\u66f2\u7ebf<\/strong>\uff08\u9700\u4fdd\u630190%\u4ee5\u4e0a\uff09\n<\/li>\n<li><strong>\u6682\u505c\u65f6\u95f4\u5206\u5e03\u56fe<\/strong>\uff08\u907f\u514d\u8d85\u8fc7200ms\u7684\u5c16\u5cf0\uff09\n<\/li>\n<li><strong>\u5185\u5b58\u5206\u4ee3\u4f7f\u7528\u8d8b\u52bf<\/strong>\uff08\u8001\u5e74\u4ee3\u4e0d\u5e94\u6301\u7eed\u6500\u5347\uff09\n<\/li>\n<\/ul>\n<h4 id=\"2-\u5173\u952e\u6307\u6807\u5173\u8054\u5206\u6790\">2. \u5173\u952e\u6307\u6807\u5173\u8054\u5206\u6790<\/h4>\n<p>\u5c06\u65e5\u5fd7\u6570\u636e\u4e0e\u7cfb\u7edf\u76d1\u63a7\u6307\u6807\u5efa\u7acb\u591a\u7ef4\u8054\u7cfb\uff1a<\/p>\n<ul>\n<li><strong>Full GC\u9891\u7387<\/strong>\u4e0eCPU\u8d1f\u8f7d\u5cf0\u503c\u7684\u65f6\u5e8f\u5bf9\u5e94\n<\/li>\n<li><strong>Young GC\u8017\u65f6<\/strong>\u4e0e\u7ebf\u7a0b\u963b\u585e\u6570\u7684\u76f8\u5173\u6027\n<\/li>\n<li><strong>\u5185\u5b58\u664b\u5347\u901f\u7387<\/strong>\u4e0e\u5bf9\u8c61\u6c60\u914d\u7f6e\u7684\u5339\u914d\u5ea6\n<\/li>\n<\/ul>\n<p>\u4f8b\u5982\u67d0\u7535\u5546\u5e73\u53f0\u5927\u4fc3\u671f\u95f4\u9891\u7e41Full GC\uff0c\u901a\u8fc7\u6bd4\u5bf9\u65e5\u5fd7\u53d1\u73b0<code>Metaspace<\/code>\u533a\u57df\u5728\u6bcf\u6b21\u52a0\u8f7d\u65b0\u7c7b\u65f6\u89e6\u53d1\u56de\u6536\uff0c\u6700\u7ec8\u5b9a\u4f4d\u5230\u52a8\u6001\u751f\u6210\u4ee3\u7406\u7c7b\u672a\u53ca\u65f6\u5378\u8f7d\u7684\u95ee\u9898\u3002<\/p>\n<h4 id=\"3-\u6a21\u5f0f\u8bc6\u522b\u4e0e\u6839\u56e0\u63a8\u65ad\">3. \u6a21\u5f0f\u8bc6\u522b\u4e0e\u6839\u56e0\u63a8\u65ad<\/h4>\n<p>\u5efa\u7acb\u5f02\u5e38\u6a21\u5f0f\u77e5\u8bc6\u5e93\uff1a<\/p>\n<ul>\n<li><strong>\u952f\u9f7f\u72b6\u5185\u5b58\u66f2\u7ebf<\/strong>\uff1a\u901a\u5e38\u4f34\u968f\u77ed\u5468\u671fYoung GC\uff0c\u53ef\u80fdEden\u533a\u8fc7\u5c0f\n<\/li>\n<li><strong>\u9636\u68af\u5f0f\u8001\u5e74\u4ee3\u589e\u957f<\/strong>\uff1a\u6307\u793a\u5185\u5b58\u6cc4\u6f0f\uff0c\u9700\u7ed3\u5408\u5806\u8f6c\u50a8\u5206\u6790\n<\/li>\n<li><strong>Full GC\u540e\u5185\u5b58\u672a\u91ca\u653e<\/strong>\uff1a\u53ef\u80fd\u5b58\u5728\u5806\u5916\u5185\u5b58\u538b\u529b\u6216<code>System.gc()<\/code>\u8bef\u8c03\u7528\n<\/li>\n<\/ul>\n<hr>\n<h3 id=\"\u4e09-\u5178\u578b\u6545\u969c\u573a\u666f\u4e0e\u7834\u89e3\u4e4b\u9053\">\u4e09\u3001\u5178\u578b\u6545\u969c\u573a\u666f\u4e0e\u7834\u89e3\u4e4b\u9053<\/h3>\n<h4 id=\"\u6848\u4f8b1-\u5468\u671f\u6027\u670d\u52a1\u5361\u987f\">\u6848\u4f8b1\uff1a\u5468\u671f\u6027\u670d\u52a1\u5361\u987f<\/h4>\n<p>\u67d0\u91d1\u878d\u7cfb\u7edf\u6bcf15\u5206\u949f\u51fa\u73b02\u79d2\u5ef6\u8fdf\uff0cGC\u65e5\u5fd7\u663e\u793a\u540c\u671f\u53d1\u751f<strong>\u5e76\u53d1\u6a21\u5f0f\u5931\u8d25<\/strong>\uff08<code>[GC (Allocation Failure) [PSYoungGen: 614400K-&gt;614400K]<\/code>\uff09\u3002\u5206\u6790\u53d1\u73b0G1\u56de\u6536\u5668<code>-XX:MaxGCPauseMillis=200<\/code>\u8bbe\u7f6e\u8fc7\u9ad8\uff0c\u5bfc\u81f4\u540e\u53f0\u56de\u6536\u7ebf\u7a0b\u65e0\u6cd5\u53ca\u65f6\u5b8c\u6210\u6807\u8bb0\uff0c\u8c03\u6574\u4e3a150ms\u540e\u95ee\u9898\u6d88\u5931\u3002<\/p>\n<h4 id=\"\u6848\u4f8b2-\u5185\u5b58\u6cc4\u6f0f\u5bfc\u81f4oom\">\u6848\u4f8b2\uff1a\u5185\u5b58\u6cc4\u6f0f\u5bfc\u81f4OOM<\/h4>\n<p>\u793e\u4ea4\u5e94\u7528\u591c\u95f4\u6279\u91cf\u4efb\u52a1\u9891\u7e41\u5d29\u6e83\uff0c\u65e5\u5fd7\u4e2d\u8001\u5e74\u4ee3\u5360\u7528\u4ece<code>2.4G<\/code>\u6301\u7eed\u589e\u957f\u81f3<code>4G<\/code>\u89e6\u53d1Full GC\u3002\u4f7f\u7528<strong>MAT\u5de5\u5177<\/strong>\u5206\u6790\u5806\u8f6c\u50a8\uff0c\u53d1\u73b0\u7f13\u5b58\u5c42\u8bef\u7528<code>ThreadLocal<\/code>\u5b58\u50a8\u7528\u6237\u4f1a\u8bdd\u6570\u636e\uff0c\u6539\u7528\u5f31\u5f15\u7528\u540e\u5185\u5b58\u66f2\u7ebf\u6062\u590d\u5e73\u7a33\u3002<\/p>\n<h4 id=\"\u6848\u4f8b3-\u4e0d\u5408\u7406\u7684gc\u7b56\u7565\">\u6848\u4f8b3\uff1a\u4e0d\u5408\u7406\u7684GC\u7b56\u7565<\/h4>\n<p>\u7269\u8054\u7f51\u8bbe\u5907\u7f51\u5173\u5728\u9ad8\u5e76\u53d1\u5199\u5165\u65f6\u541e\u5410\u91cf\u9aa4\u964d\uff0c\u65e5\u5fd7\u663e\u793aCMS\u56de\u6536\u5668<code>concurrent mode failure<\/code>\u8d85\u767e\u6b21\u3002\u5207\u6362\u4e3aG1\u5e76\u8bbe\u7f6e<code>-XX:G1HeapRegionSize=16m<\/code>\u540e\uff0c\u6682\u505c\u65f6\u95f4\u4ece300ms\u964d\u81f350ms\u4ee5\u5185\u3002<\/p>\n<hr>\n<h3 id=\"\u56db-\u9ad8\u7ea7\u5206\u6790\u6280\u5de7\u4e0e\u5de5\u5177\u94fe\">\u56db\u3001\u9ad8\u7ea7\u5206\u6790\u6280\u5de7\u4e0e\u5de5\u5177\u94fe<\/h3>\n<ol>\n<li><strong>\u65f6\u5e8f\u5173\u8054\u5206\u6790<\/strong>\uff1a\u5c06GC\u4e8b\u4ef6\u4e0eAPM\u5de5\u5177\uff08\u5982<a href=\"https:\/\/www.yunshan.net\/\"   target=\"_blank\" style=\"color:blue\">SkyWalking<\/a>\uff09\u7684trace\u65e5\u5fd7\u5bf9\u9f50\uff0c\u5b9a\u4f4d\u7279\u5b9a\u64cd\u4f5c\u89e6\u53d1\u7684\u5185\u5b58\u95ee\u9898\n<\/li>\n<li><strong>\u673a\u5668\u5b66\u4e60\u9884\u8b66<\/strong>\uff1a\u4f7f\u7528ELK\u6808\u5efa\u7acb\u57fa\u7ebf\u6a21\u578b\uff0c\u5f53Young GC\u8017\u65f6\u7a81\u589e2\u500d\u6807\u51c6\u5dee\u65f6\u89e6\u53d1\u544a\u8b66\n<\/li>\n<li><strong>GC\u8c03\u4f18\u9a8c\u8bc1<\/strong>\uff1a\u901a\u8fc7<strong>JMH\u57fa\u51c6\u6d4b\u8bd5<\/strong>\u5bf9\u6bd4\u4e0d\u540c\u53c2\u6570\u7ec4\u5408\uff08\u5982<code>-XX:SurvivorRatio=8<\/code>\u4e0e<code>=6<\/code>\uff09\u7684\u6027\u80fd\u5dee\u5f02\n<\/li>\n<\/ol>\n<p>\u67d0\u89c6\u9891\u5904\u7406\u5e73\u53f0\u901a\u8fc7<strong>\u706b\u7130\u56fe<\/strong>\u53d1\u73b0GC\u7ebf\u7a0bCPU\u5360\u7528\u8fc7\u9ad8\uff0c\u7ed3\u5408\u65e5\u5fd7\u4e2d\u7684<code>[Times: user=1.23 sys=0.12, real=0.45 secs]<\/code>\u6570\u636e\uff0c\u6700\u7ec8\u786e\u5b9a\u8c03\u6574<code>-XX:ConcGCThreads=4<\/code>\u4f7f\u7cfb\u7edf\u541e\u5410\u91cf\u63d0\u534717%\u3002<\/p>\n<hr>\n<h3 id=\"\u4e94-\u4ece\u65e5\u5fd7\u5206\u6790\u5230\u67b6\u6784\u4f18\u5316\">\u4e94\u3001\u4ece\u65e5\u5fd7\u5206\u6790\u5230\u67b6\u6784\u4f18\u5316<\/h3>\n<p>\u5f53\u5e38\u89c4\u8c03\u4f18\u65e0\u6cd5\u6ee1\u8db3\u9700\u6c42\u65f6\uff0cGC\u65e5\u5fd7\u80fd\u6307\u5f15\u67b6\u6784\u7ea7\u6539\u9020\uff1a<\/p>\n<ul>\n<li><strong>\u5806\u5916\u5185\u5b58\u6cbb\u7406<\/strong>\uff1a\u53d1\u73b0<code>Native Memory Tracking<\/code>\u663e\u793a\u7684\u975e\u5806\u5185\u5b58\u5f02\u5e38\n<\/li>\n<li><strong>\u5206\u5e03\u5f0f\u7f13\u5b58\u4f18\u5316<\/strong>\uff1a\u901a\u8fc7GC\u538b\u529b\u53cd\u63a8\u672c\u5730\u7f13\u5b58\u547d\u4e2d\u7387\u74f6\u9888\n<\/li>\n<li><strong>\u5bf9\u8c61\u6c60\u6539\u9020<\/strong>\uff1a\u6839\u636e\u664b\u5347\u5e74\u9f84\u5206\u5e03\u8c03\u6574\u6c60\u5316\u7b56\u7565\n<\/li>\n<\/ul>\n<p>\u67d0\u4e91\u6570\u636e\u5e93\u670d\u52a1\u5546\u901a\u8fc7\u5206\u6790GC\u65e5\u5fd7\u4e2d\u7684<code>Avg STW\u65f6\u95f4<\/code>\uff0c\u5c06JDK\u4ece8\u5347\u7ea7\u81f311\u5e76\u542f\u7528ZGC\uff0c\u4f7f99.9%\u7684GC\u505c\u987f\u63a7\u5236\u57283ms\u5185\uff0c\u5b8c\u7f8e\u652f\u6491\u4e86\u5b9e\u65f6\u98ce\u63a7\u573a\u666f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u5f53\u4eca\u7684\u9ad8\u5e76\u53d1\u3001\u9ad8\u8d1f\u8f7d\u5e94\u7528\u573a\u666f\u4e2d\uff0c\u7cfb\u7edf\u6027\u80fd\u95ee\u9898\u5e38\u5e38\u50cf\u4e00\u628a\u60ac\u5728\u5f00\u53d1\u8005\u5934\u9876\u7684\u8fbe\u6469\u514b\u5229\u65af\u4e4b\u5251\u3002\u5f53\u5e94\u7528\u51fa\u73b0\u54cd\u5e94\u5ef6\u8fdf\u3001\u9891\u7e41\u5361\u987f\u751a\u81f3\u5d29\u6e83\u65f6\uff0c\u5f88\u591a\u4eba\u7b2c\u4e00\u53cd\u5e94\u662f\u68c0\u67e5\u4ee3\u7801\u903b\u8f91\u6216\u6570\u636e\u5e93\u6027\u80fd\uff0c\u5374\u5f80\u5f80\u5ffd\u7565\u4e86\u4e00\u4e2a\u9690\u85cf\u7684\u5173\u952e\u7ebf\u7d22\u2014\u2014GC\u65e5\u5fd7\u3002\u4e8b\u5b9e\u4e0a\uff0c\u6839\u636eOracle\u5b98\u65b9\u7edf\u8ba1\uff0c\u8d85\u8fc760%\u7684Java\u5e94\u7528\u6027\u80fd\u95ee\u9898\u4e0e\u5185\u5b58\u7ba1\u7406\u76f4\u63a5\u76f8\u5173\uff0c\u800c\u7cbe\u51c6\u89e3\u8bfbGC\u65e5\u5fd7\u6b63\u662f\u6253\u5f00\u95ee\u9898\u75c7\u7ed3\u7684\u91d1\u94a5\u5319\u3002 \u4e00\u3001\u4e3a\u4ec0\u4e48GC\u65e5\u5fd7\u662f\u6545\u969c\u5b9a\u4f4d\u7684&rdquo;X\u5149\u7247&rdquo; Java\u865a\u62df\u673a\u7684\u5783\u573e\u56de\u6536\u673a\u5236\uff08Garbage Collection\uff09\u76f4\u63a5\u5f71\u54cd\u7740\u5e94\u7528\u7684\u541e\u5410\u91cf\u548c\u54cd\u5e94\u65f6\u95f4\u3002GC\u65e5\u5fd7\u8bb0\u5f55\u4e86\u5185\u5b58\u56de\u6536\u7684\u5b8c\u6574\u751f\u547d\u5468\u671f\uff0c\u5305\u62ecYoung GC\u3001Full GC\u7684\u9891\u7387\u4e0e\u8017\u65f6\u3001\u5185\u5b58\u533a\u57df\u7684\u5206\u914d\u53d8\u5316\u7b49\u6838\u5fc3\u6307\u6807\u3002\u8fd9\u4e9b\u6570\u636e\u5982\u540c\u533b\u7597\u5f71\u50cf\uff0c\u80fd\u76f4\u89c2\u66b4\u9732\u4ee5\u4e0b\u95ee\u9898\uff1a \u5185\u5b58\u6cc4\u6f0f\u7684\u86db\u4e1d\u9a6c\u8ff9\uff08\u5982\u8001\u5e74\u4ee3\u6301\u7eed\u589e\u957f\uff09 \u4e0d\u5408\u7406\u7684\u5806\u5185\u5b58\u914d\u7f6e\uff08\u5982Survivor\u533a\u8fc7\u65e9\u6ea2\u51fa\uff09 GC\u7b56\u7565\u4e0e\u4e1a\u52a1\u573a\u666f\u7684\u9519\u914d\uff08\u5982CMS\u4e0e\u9ad8\u541e\u5410\u91cf\u573a\u666f\u7684\u51b2\u7a81\uff09 \u901a\u8fc7\u5206\u6790\u65e5\u5fd7\u4e2d\u7684[PSYoungGen: 614400K-&gt;81920K]\u7c7b\u6570\u636e\uff0c\u53ef\u4ee5\u7cbe\u786e\u8ba1\u7b97\u5185\u5b58\u56de\u6536\u6548\u7387\u3002\u4f8b\u5982\u5f53\u8001\u5e74\u4ee3\u56de\u6536\u540e\u5185\u5b58\u91ca\u653e\u91cf\uff08[ParOldGen: 1024000K-&gt;1024000K]\uff09\u957f\u671f\u672a\u53d8\u5316\uff0c\u6781\u53ef\u80fd\u5b58\u5728\u5bf9\u8c61\u672a\u88ab\u6b63\u786e\u91ca\u653e\u3002 \u4e8c\u3001GC\u65e5\u5fd7\u5206\u6790\u7684\u4e09\u5927\u6838\u5fc3\u6b65\u9aa4 1. \u65e5\u5fd7\u91c7\u96c6\u4e0e\u9884\u5904\u7406 \u542f\u7528JVM\u53c2\u6570-XX:+PrintGCDetails -Xloggc:\/path\/to\/gc.log\u751f\u6210\u8be6\u7ec6\u65e5\u5fd7\u3002\u5bf9\u4e8e\u5bb9\u5668\u5316\u73af\u5883\uff0c\u5efa\u8bae\u8ffd\u52a0-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5\u5b9e\u73b0\u65e5\u5fd7\u8f6e\u8f6c\u3002\u4f7f\u7528GCViewer\u6216GCEasy\u7b49\u5de5\u5177\u8fdb\u884c\u53ef\u89c6\u5316\u5904\u7406\u65f6\uff0c\u91cd\u70b9\u5173\u6ce8\uff1a \u541e\u5410\u91cf\u66f2\u7ebf\uff08\u9700\u4fdd\u630190%\u4ee5\u4e0a\uff09 \u6682\u505c\u65f6\u95f4\u5206\u5e03\u56fe\uff08\u907f\u514d\u8d85\u8fc7200ms\u7684\u5c16\u5cf0\uff09 \u5185\u5b58\u5206\u4ee3\u4f7f\u7528\u8d8b\u52bf\uff08\u8001\u5e74\u4ee3\u4e0d\u5e94\u6301\u7eed\u6500\u5347\uff09 2. \u5173\u952e\u6307\u6807\u5173\u8054\u5206\u6790 \u5c06\u65e5\u5fd7\u6570\u636e\u4e0e\u7cfb\u7edf\u76d1\u63a7\u6307\u6807\u5efa\u7acb\u591a\u7ef4\u8054\u7cfb\uff1a Full GC\u9891\u7387\u4e0eCPU\u8d1f\u8f7d\u5cf0\u503c\u7684\u65f6\u5e8f\u5bf9\u5e94 Young GC\u8017\u65f6\u4e0e\u7ebf\u7a0b\u963b\u585e\u6570\u7684\u76f8\u5173\u6027 \u5185\u5b58\u664b\u5347\u901f\u7387\u4e0e\u5bf9\u8c61\u6c60\u914d\u7f6e\u7684\u5339\u914d\u5ea6 \u4f8b\u5982\u67d0\u7535\u5546\u5e73\u53f0\u5927\u4fc3\u671f\u95f4\u9891\u7e41Full GC\uff0c\u901a\u8fc7\u6bd4\u5bf9\u65e5\u5fd7\u53d1\u73b0Metaspace\u533a\u57df\u5728\u6bcf\u6b21\u52a0\u8f7d\u65b0\u7c7b\u65f6\u89e6\u53d1\u56de\u6536\uff0c\u6700\u7ec8\u5b9a\u4f4d\u5230\u52a8\u6001\u751f\u6210\u4ee3\u7406\u7c7b\u672a\u53ca\u65f6\u5378\u8f7d\u7684\u95ee\u9898\u3002 3. \u6a21\u5f0f\u8bc6\u522b\u4e0e\u6839\u56e0\u63a8\u65ad \u5efa\u7acb\u5f02\u5e38\u6a21\u5f0f\u77e5\u8bc6\u5e93\uff1a \u952f\u9f7f\u72b6\u5185\u5b58\u66f2\u7ebf\uff1a\u901a\u5e38\u4f34\u968f\u77ed\u5468\u671fYoung GC\uff0c\u53ef\u80fdEden\u533a\u8fc7\u5c0f \u9636\u68af\u5f0f\u8001\u5e74\u4ee3\u589e\u957f\uff1a\u6307\u793a\u5185\u5b58\u6cc4\u6f0f\uff0c\u9700\u7ed3\u5408\u5806\u8f6c\u50a8\u5206\u6790 Full GC\u540e\u5185\u5b58\u672a\u91ca\u653e\uff1a\u53ef\u80fd\u5b58\u5728\u5806\u5916\u5185\u5b58\u538b\u529b\u6216System.gc()\u8bef\u8c03\u7528 \u4e09\u3001\u5178\u578b\u6545\u969c\u573a\u666f\u4e0e\u7834\u89e3\u4e4b\u9053 \u6848\u4f8b1\uff1a\u5468\u671f\u6027\u670d\u52a1\u5361\u987f \u67d0\u91d1\u878d\u7cfb\u7edf\u6bcf15\u5206\u949f\u51fa\u73b02\u79d2\u5ef6\u8fdf\uff0cGC\u65e5\u5fd7\u663e\u793a\u540c\u671f\u53d1\u751f\u5e76\u53d1\u6a21\u5f0f\u5931\u8d25\uff08[GC (Allocation Failure) [PSYoungGen: 614400K-&gt;614400K]\uff09\u3002\u5206\u6790\u53d1\u73b0G1\u56de\u6536\u5668-XX:MaxGCPauseMillis=200\u8bbe\u7f6e\u8fc7\u9ad8\uff0c\u5bfc\u81f4\u540e\u53f0\u56de\u6536\u7ebf\u7a0b\u65e0\u6cd5\u53ca\u65f6\u5b8c\u6210\u6807\u8bb0\uff0c\u8c03\u6574\u4e3a150ms\u540e\u95ee\u9898\u6d88\u5931\u3002 \u6848\u4f8b2\uff1a\u5185\u5b58\u6cc4\u6f0f\u5bfc\u81f4OOM \u793e\u4ea4\u5e94\u7528\u591c\u95f4\u6279\u91cf\u4efb\u52a1\u9891\u7e41\u5d29\u6e83\uff0c\u65e5\u5fd7\u4e2d\u8001\u5e74\u4ee3\u5360\u7528\u4ece2.4G\u6301\u7eed\u589e\u957f\u81f34G\u89e6\u53d1Full GC\u3002\u4f7f\u7528MAT\u5de5\u5177\u5206\u6790\u5806\u8f6c\u50a8\uff0c\u53d1\u73b0\u7f13\u5b58\u5c42\u8bef\u7528ThreadLocal\u5b58\u50a8\u7528\u6237\u4f1a\u8bdd\u6570\u636e\uff0c\u6539\u7528\u5f31\u5f15\u7528\u540e\u5185\u5b58\u66f2\u7ebf\u6062\u590d\u5e73\u7a33\u3002 \u6848\u4f8b3\uff1a\u4e0d\u5408\u7406\u7684GC\u7b56\u7565 \u7269\u8054\u7f51\u8bbe\u5907\u7f51\u5173\u5728\u9ad8\u5e76\u53d1\u5199\u5165\u65f6\u541e\u5410\u91cf\u9aa4\u964d\uff0c\u65e5\u5fd7\u663e\u793aCMS\u56de\u6536\u5668concurrent mode failure\u8d85\u767e\u6b21\u3002\u5207\u6362\u4e3aG1\u5e76\u8bbe\u7f6e-XX:G1HeapRegionSize=16m\u540e\uff0c\u6682\u505c\u65f6\u95f4\u4ece300ms\u964d\u81f350ms\u4ee5\u5185\u3002 \u56db\u3001\u9ad8\u7ea7\u5206\u6790\u6280\u5de7\u4e0e\u5de5\u5177\u94fe \u65f6\u5e8f\u5173\u8054\u5206\u6790\uff1a\u5c06GC\u4e8b\u4ef6\u4e0eAPM\u5de5\u5177\uff08\u5982SkyWalking\uff09\u7684trace\u65e5\u5fd7\u5bf9\u9f50\uff0c\u5b9a\u4f4d\u7279\u5b9a\u64cd\u4f5c\u89e6\u53d1\u7684\u5185\u5b58\u95ee\u9898 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":32637,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-32636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-news"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/32636","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/comments?post=32636"}],"version-history":[{"count":1,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/32636\/revisions"}],"predecessor-version":[{"id":32638,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/32636\/revisions\/32638"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media\/32637"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=32636"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=32636"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=32636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}