{"id":2916,"date":"2023-07-14T14:41:21","date_gmt":"2023-07-14T06:41:21","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=2916"},"modified":"2023-07-14T14:41:21","modified_gmt":"2023-07-14T06:41:21","slug":"%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9a%e5%a6%82%e4%bd%95%e8%bf%9b%e8%a1%8c-jvm-%e8%b0%83%e4%bc%98%ef%bc%88%e9%99%84%e7%9c%9f%e5%ae%9e%e6%a1%88%e4%be%8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/jvm\/%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9a%e5%a6%82%e4%bd%95%e8%bf%9b%e8%a1%8c-jvm-%e8%b0%83%e4%bc%98%ef%bc%88%e9%99%84%e7%9c%9f%e5%ae%9e%e6%a1%88%e4%be%8b%ef%bc%89\/","title":{"rendered":"\u9762\u8bd5\u5b98\uff1a\u5982\u4f55\u8fdb\u884c JVM \u8c03\u4f18\uff08\u9644\u771f\u5b9e\u6848\u4f8b\uff09"},"content":{"rendered":"<link rel=\"stylesheet\" href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/kdoc_html_views-1a98987dfd.css\">\n \t<link rel=\"stylesheet\" href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/ck_htmledit_views-25cebea3f9.css\">\n<div id=\"content_views\" class=\"htmledit_views\">\n<h1><strong>\u524d\u8a00<\/strong><\/h1>\n<p>\u9762\u8bd5\u5b98\uff1a\u5728\u5de5\u4f5c\u4e2d\u505a\u8fc7 JVM \u8c03\u4f18\u5417\uff1f\u8bb2\u8bb2\u505a\u8fc7\u54ea\u4e9b JVM \u8c03\u4f18\uff1f<\/p>\n<p>\u6211\u4e00\u4e2aQPS\u4e0d\u523010\u7684\u9879\u76ee\uff0c\u4e0a\u6b21\u95ee\u6211\u7f13\u5b58\u7a7f\u900f\u7f13\u5b58\u96ea\u5d29\uff0c\u8fd9\u6b21\u95ee\u6211 JVM \u8c03\u4f18\uff0c\u6211\u662f\u771f\u6ef4\u96be\u3002<\/p>\n<p class=\"img-center\"><img decoding=\"async\" class=\"lazyload\"alt=\"\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\"><noscript><img decoding=\"async\" alt=\"\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png\"><\/noscript><\/p>\n<p>\u4e0d\u8fc7\u5927\u5bb6\u522b\u614c\uff0c\u70ed\u5fc3\u7684\u6211\u7ed9\u5927\u5bb6\u627e\u6765\u4e86\u51e0\u4e2a\u6ee1\u5206\u56de\u7b54\uff0c\u5927\u5bb6\u9009\u62e9\u5408\u9002\u7684\u4f7f\u7528\u3002<\/p>\n<p>\u56de\u7b541\uff1a\u542c\u597d\u4e86\uff0c\u4e0b\u9762\u5c06\u662f\u6211\u7b2c\u4e00\u6b21 JVM \u8c03\u4f18\u3002<\/p>\n<p>\u56de\u7b542\uff1a\u6211\u4e00\u822c\u9762\u8bd5\u7684\u65f6\u5019\u624d\u8c03\u4f18\u3002<\/p>\n<p>\u56de\u7b543\uff1a\u6211\u4e00\u822c\u76f4\u63a5\u52a0\u673a\u5668\u3001\u52a0\u5185\u5b58\u3002<\/p>\n<p>\u56de\u7b544\uff1a\u8001\u5b50\u76f4\u63a5\u7528\u7684 ZGC\uff0c\u8c03\u4e2a\u86c7\u76ae\u3002<\/p>\n<h1><strong>\u6b63\u6587<\/strong><\/h1>\n<h2><strong>1\u3001JVM \u7a76\u7adf\u9700\u4e0d\u9700\u8981\u8c03\u4f18\uff1f<\/strong><\/h2>\n<p>JVM \u7ecf\u8fc7\u8fd9\u4e48\u591a\u5e74\u7684\u53d1\u5c55\u548c\u9a8c\u8bc1\uff0c\u6574\u4f53\u662f\u975e\u5e38\u5065\u58ee\u7684\u3002\u4e2a\u4eba\u8ba4\u4e3a99%\u7684\u60c5\u51b5\u4e0b\uff0c\u57fa\u672c\u7528\u4e0d\u5230 JVM \u8c03\u4f18\u3002<\/p>\n<p>\u901a\u5e38\u6765\u8bf4\uff0c\u6211\u4eec\u7684 JVM \u53c2\u6570\u914d\u7f6e\u5927\u591a\u8fd8\u662f\u4f1a\u9075\u5faa JVM \u5b98\u65b9\u7684\u5efa\u8bae\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>-XX:NewRatio=2\uff0c\u5e74\u8f7b\u4ee3:\u8001\u5e74\u4ee3=1:2<\/li>\n<li>-XX:SurvivorRatio=8\uff0ceden:survivor=8:1<\/li>\n<li>\u5806\u5185\u5b58\u8bbe\u7f6e\u4e3a\u7269\u7406\u5185\u5b58\u76843\/4\u5de6\u53f3<\/li>\n<li>\u7b49\u7b49<\/li>\n<\/ul>\n<p>JVM \u53c2\u6570\u7684\u9ed8\u8ba4\uff08\u63a8\u8350\uff09\u503c\u90fd\u662f\u7ecf\u8fc7 JVM \u56e2\u961f\u7684\u53cd\u590d\u6d4b\u8bd5\u548c\u524d\u4eba\u7684\u5145\u5206\u9a8c\u8bc1\u5f97\u51fa\u7684\u6bd4\u8f83\u5408\u7406\u7684\u503c\uff0c\u56e0\u6b64\u901a\u5e38\u6765\u8bf4\u662f\u6bd4\u8f83\u9760\u8c31\u548c\u901a\u7528\u7684\uff0c\u4e00\u822c\u4e0d\u4f1a\u51fa\u5927\u95ee\u9898\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u66f4\u91cd\u8981\u7684\u662f\uff0c\u5927\u90e8\u5206\u7684\u5e94\u7528 QPS \u90fd\u4e0d\u523010\uff0c\u6570\u636e\u91cf\u4e0d\u5230\u51e0\u4e07\uff0c\u8fd9\u79cd\u4f4e\u538b\u73af\u5883\u4e0b\uff0c\u60f3\u8ba9 JVM \u51fa\u95ee\u9898\uff0c\u8bf4\u5b9e\u8bdd\u4e5f\u633a\u96be\u7684\u3002<\/p>\n<p class=\"img-center\"><img decoding=\"async\" class=\"lazyload\"alt=\"\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/20230714144051c4c4b18a9.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\"><noscript><img decoding=\"async\" alt=\"\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/20230714144051c4c4b18a9.png\"><\/noscript><\/p>\n<p>\u5927\u90e8\u5206\u540c\u5b66\u66f4\u5e38\u9047\u5230\u7684\u5e94\u8be5\u662f\u81ea\u5df1\u7684\u4ee3\u7801 bug \u5bfc\u81f4 OOM\u3001CPU load\u9ad8\u3001GC\u9891\u7e41\u5565\u7684\uff0c\u8fd9\u4e9b\u573a\u666f\u4e5f\u57fa\u672c\u90fd\u662f\u4ee3\u7801\u4fee\u590d\u5373\u53ef\uff0c\u901a\u5e38\u4e0d\u9700\u8981\u52a8 JVM\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u4fd7\u8bdd\u8bf4\u5f97\u597d\uff0c\u51e1\u4e8b\u65e0\u7edd\u5bf9\uff0c\u8fd8\u662f\u6709\u4e00\u5c0f\u90e8\u5206\u573a\u666f\uff0c\u662f\u53ef\u80fd\u9700\u8981\u7528\u5230 JVM \u8c03\u4f18\u7684\u3002\u5177\u4f53\u54ea\u4e9b\u573a\u666f\uff0c\u6211\u4eec\u5728\u4e0b\u9762\u4ecb\u7ecd\u3002<\/p>\n<p>\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u6211\u4eec\u8fd9\u8fb9\u6240\u8bf4\u7684 JVM \u8c03\u4f18\u66f4\u591a\u7684\u662f\u9488\u5bf9\u81ea\u5df1\u7684\u4e1a\u52a1\u573a\u666f\u5bf9 JVM \u53c2\u6570\u8fdb\u884c\u4f18\u5316\u8c03\u6574\uff0c\u4f7f\u5176\u66f4\u9002\u5408\u6211\u4eec\u7684\u4e1a\u52a1\uff0c\u800c\u4e0d\u662f\u6307\u5bf9 JVM \u6e90\u7801\u7684\u6539\u52a8\u3002<\/p>\n<h2><strong>2\u3001JVM \u8c03\u4f18\u6ca1\u6709\u4ec0\u4e48\u5fc5\u8981\uff0c\u4f7f\u7528\u6027\u80fd\u66f4\u597d\u7684\u5783\u573e\u56de\u6536\u5668\u5c31\u80fd\u89e3\u51b3\u95ee\u9898\u4e86\uff1f<\/strong><\/h2>\n<p>\u8fd9\u662f\u6211\u5728\u7f51\u4e0a\u770b\u5230\u7684\u4e00\u4e2a\u8bf4\u6cd5\uff0c\u56e0\u4e3a\u8d5e\u540c\u7684\u4eba\u6bd4\u8f83\u591a\uff0c\u6211\u4f30\u8ba1\u6709\u4e0d\u5c11\u540c\u5b66\u4e5f\u4f1a\u6709\u8fd9\u4e2a\u60f3\u6cd5\uff0c\u56e0\u6b64\u5728\u8fd9\u8fb9\u8c08\u4e0b\u81ea\u5df1\u7684\u770b\u6cd5\u3002<\/p>\n<p><strong>1\uff09\u5b9e\u6218\u89d2\u5ea6<\/strong><\/p>\n<p>\u4e0d\u8003\u8651\u5e94\u4ed8\u9762\u8bd5\u7684\u56e0\u7d20\uff0c\u5347\u7ea7\u5783\u573e\u56de\u6536\u5668\u786e\u5b9e\u4f1a\u662f\u6700\u6709\u6548\u7684\u65b9\u5f0f\u4e4b\u4e00\uff0c\u4f8b\u5982\uff1aCMS \u5347\u7ea7\u5230 G1\uff0c\u751a\u81f3 ZGC\u3002<\/p>\n<p>\u8fd9\u4e2a\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u66f4\u9ad8\u7248\u672c\u7684\u5783\u573e\u56de\u6536\u5668\u76f8\u5f53\u4e8e\u662f JVM \u5f00\u53d1\u4eba\u5458\u5bf9 JVM \u505a\u7684\u4f18\u5316\uff0c\u4eba\u5bb6\u6bd5\u7adf\u662f\u4e13\u95e8\u505a\u8fd9\u4e2a\u7684\uff0c\u6240\u4ee5\u901a\u5e38\u6765\u8bf4\u5347\u7ea7\u9ad8\u7248\u672c\u7684\u6027\u80fd\u4f1a\u6709\u4e0d\u5c11\u7684\u63d0\u5347\u3002<\/p>\n<p>G1 \u76ee\u524d\u5df2\u7ecf\u6709\u5f00\u59cb\u5728\u9010\u6e10\u5e94\u7528\u5f00\u6765\uff0c\u5468\u56f4\u6709\u4e0d\u5c11\u56e2\u961f\u5728 JDK8 \u4e2d\u4f7f\u7528\u4e86 G1\uff0c\u5c31\u6211\u4e86\u89e3\u5230\u7684\uff0c\u8fd8\u662f\u5b58\u5728\u4e0d\u5c11\u95ee\u9898\u7684\uff0c\u4e0d\u5c11\u540c\u5b66\u5728\u4e0d\u65ad\u8fdb\u884c\u53c2\u6570\u7684\u8c03\u6574\uff0c\u800c\u5728 JDK11 \u4e2d\u80fd\u4f18\u5316\u6210\u5565\u6837\u8fd8\u6709\u5f85\u9a8c\u8bc1\u3002<\/p>\n<p>ZGC \u76ee\u524d\u5e94\u7528\u7684\u8fd8\u6bd4\u8f83\u5c11\uff0c\u4ec5\u4ece\u5bf9\u5916\u516c\u5e03\u7684\u6570\u636e\u6765\u770b\u5f88\u597d\u770b\uff0c\u6700\u5927\u6682\u505c\u65f6\u95f4\u4e0d\u8d85\u8fc710ms\uff0c\u751a\u81f3\u662f1ms\uff0c\u5927\u5bb6\u90fd\u62b1\u6709\u5f88\u9ad8\u7684\u671f\u671b\u3002\u4f46\u662f\u4ece\u76ee\u524d\u6211\u6536\u96c6\u5230\u7684\u4e00\u4e9b\u8d44\u6599\u6765\u770b\uff0cZGC \u4e5f\u5e76\u4e0d\u662f\u94f6\u5f39\uff0c\u5df2\u77e5\u7684\u660e\u663e\u95ee\u9898\u6709\uff1a<\/p>\n<ul>\n<li>\u541e\u5410\u91cf\u76f8\u8f83\u4e8e G1&nbsp;\u4f1a\u6709\u6240\u4e0b\u964d\uff0c\u5b98\u65b9\u79f0\u6700\u5927\u4e0d\u8d85\u8fc715%<\/li>\n<li>ZGC\u5982\u679c\u9047\u5230\u975e\u5e38\u9ad8\u7684\u5bf9\u8c61\u5206\u914d\u901f\u7387\uff08allocation rate\uff09\u7684\u8bdd\u4f1a\u8ddf\u4e0d\u4e0a\uff0c\u76ee\u524d\u552f\u4e00\u6709\u6548\u7684\u201c\u8c03\u4f18\u201d\u65b9\u5f0f\u5c31\u662f\u589e\u5927\u6574\u4e2aGC\u5806\u7684\u5927\u5c0f\u6765\u8ba9ZGC\u6709\u66f4\u5927\u7684\u5598\u606f\u7a7a\u95f4\u2014\u2014R\u5927\u4e0eZGC\u9886\u961f\u6c9f\u901a\u540e\u7684\u539f\u8bdd<\/li>\n<\/ul>\n<p>\u800c\u4e14\uff0c\u968f\u7740\u540e\u7eed ZGC \u5e94\u7528\u5f00\u6765\uff0c\u540e\u7eed\u4e00\u5b9a\u4f1a\u4e0d\u65ad\u51fa\u73b0\u66f4\u591a\u95ee\u9898\u7684\u3002<\/p>\n<p>\u6574\u4f53\u800c\u8a00\uff0c\u4e2a\u4eba\u89c9\u5f97 JVM \u8c03\u4f18\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\u8fd8\u662f\u6709\u5fc5\u8981\u7684\uff0c\u6bd5\u7adf\u6709\u53e5\u8bdd\u53eb\uff1a\u6ca1\u6709\u6700\u597d\u7684\uff0c\u53ea\u6709\u6700\u5408\u9002\u7684\u3002<\/p>\n<p><strong>2\uff09\u9762\u8bd5\u89d2\u5ea6<\/strong><\/p>\n<p>\u5982\u679c\u4f60\u56de\u7b54\u76f4\u63a5\u5347\u7ea7\u5783\u573e\u6536\u96c6\u5668\uff0c\u9762\u8bd5\u5b98\u53ef\u80fd\u4e5f\u8d5e\u540c\uff0c\u4f46\u662f\u8fd9\u4e2a\u8bdd\u9898\u53ef\u80fd\u5c31\u8fd9\u6837\u7ed3\u675f\u4e86\uff0c\u9762\u8bd5\u5b98\u5927\u6982\u7387\u6ca1\u542c\u5230\u4ed6\u60f3\u8981\u7684\u56de\u7b54\uff0c\u4f60\u5728\u8fd9\u9898\u7684\u80af\u5b9a\u62ff\u4e0d\u5230\u52a0\u5206\uff0c\u751a\u81f3\u53ef\u80fd\u4f1a\u88ab\u6263\u5206\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u5728\u9762\u8bd5\u7684\u65f6\u5019\uff0c\u4f60\u53ef\u4ee5\u56de\u7b54\u5347\u7ea7\u5783\u573e\u6536\u96c6\u5668\uff0c\u4f46\u662f\u4f60\u4e0d\u80fd\u53ea\u56de\u7b54\u5347\u7ea7\u5783\u573e\u6536\u96c6\u5668\u3002<\/p>\n<h2><strong>3\u3001JVM \u4f55\u65f6\u4f18\u5316\uff1f<\/strong><\/h2>\n<p>\u5fcc\u8fc7\u65e9\u4f18\u5316\u3002\u300a\u8ba1\u7b97\u673a\u7a0b\u5e8f\u8bbe\u8ba1\u827a\u672f\u300b\u7684\u4f5c\u8005\u9ad8\u5fb7\u7eb3\uff08Donald Ervin Knuth\uff09\u66fe\u8bf4\u8fc7\u4e00\u53e5\u7ecf\u5178\u7684\u8bdd\uff1a<\/p>\n<blockquote><p>The real problem is that programmers have spent far too much time worrying about efficiency in the wrong places and at the wrong times; premature optimization is the root of all evil (or at least most of it) in programming.<\/p>\n<p>\u771f\u6b63\u7684\u95ee\u9898\u662f\uff0c\u7a0b\u5e8f\u733f\u5728\u9519\u8bef\u7684\u5730\u65b9\u548c\u9519\u8bef\u7684\u65f6\u95f4\u82b1\u4e86\u592a\u591a\u7684\u65f6\u95f4\u62c5\u5fc3\u6548\u7387\u95ee\u9898\uff1b\u8fc7\u65e9\u7684\u4f18\u5316\u662f\u7f16\u7a0b\u4e2d\u6240\u6709\uff08\u6216\u8005\u81f3\u5c11\u662f\u5927\u90e8\u5206\uff09\u7f6a\u6076\u7684\u6839\u6e90\u3002<\/p><\/blockquote>\n<p>\u5fcc\u8fc7\u65e9\u5e76\u4e0d\u662f\u8bf4\u5c31\u5b8c\u5168\u4e0d\u7ba1\uff0c\u6bd4\u8f83\u6b63\u786e\u7684\u505a\u6cd5\u5e94\u8be5\u662f\u7ed9\u6838\u5fc3\u670d\u52a1\u7684\u4e00\u4e9b\u91cd\u8981&nbsp;JVM&nbsp;\u6307\u6807\u914d\u4e0a\u76d1\u63a7\u544a\u8b66\uff0c\u5f53\u6307\u6807\u51fa\u73b0\u6ce2\u52a8\u6216\u8005\u5f02\u5e38\u65f6\uff0c\u80fd\u53ca\u65f6\u4ecb\u5165\u6392\u67e5\u3002<\/p>\n<p><strong>\u9762\u8bd5\u5b98\uff1aJVM \u6709\u54ea\u4e9b\u6838\u5fc3\u6307\u6807\uff1f\u5408\u7406\u8303\u56f4\u5e94\u8be5\u662f\u591a\u5c11\uff1f<\/strong><\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u6ca1\u6709\u7edf\u4e00\u7684\u7b54\u6848\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u670d\u52a1\u5bf9AVG\/TP999\/TP9999\u7b49\u6027\u80fd\u6307\u6807\u7684\u8981\u6c42\u662f\u4e0d\u540c\u7684\uff0c\u56e0\u6b64\u5408\u7406\u7684\u8303\u56f4\u4e5f\u4e0d\u540c\u3002<\/p>\n<p>\u4e3a\u4e86\u9632\u6b62\u9762\u8bd5\u5b98\u8ffd\u95ee\uff0c\u5bf9\u4e8e\u666e\u901a\u7684 Java \u540e\u7aef\u5e94\u7528\u6765\u8bf4\uff0c\u6211\u8fd9\u8fb9\u7ed9\u51fa\u4e00\u4efd\u76f8\u5bf9\u5408\u7406\u7684\u8303\u56f4\u503c\u3002\u4ee5\u4e0b\u6307\u6807\u90fd\u662f\u5bf9\u4e8e\u5355\u53f0\u670d\u52a1\u5668\u6765\u8bf4\uff1a<\/p>\n<ul>\n<li>jvm.gc.time\uff1a\u6bcf\u5206\u949f\u7684GC\u8017\u65f6\u57281s\u4ee5\u5185\uff0c500ms\u4ee5\u5185\u5c24\u4f73<\/li>\n<li>jvm.gc.meantime\uff1a\u6bcf\u6b21YGC\u8017\u65f6\u5728100ms\u4ee5\u5185\uff0c50ms\u4ee5\u5185\u5c24\u4f73<\/li>\n<li>jvm.fullgc.count\uff1aFGC\u6700\u591a\u51e0\u5c0f\u65f61\u6b21\uff0c1\u5929\u4e0d\u52301\u6b21\u5c24\u4f73<\/li>\n<li>jvm.fullgc.time\uff1a\u6bcf\u6b21FGC\u8017\u65f6\u57281s\u4ee5\u5185\uff0c500ms\u4ee5\u5185\u5c24\u4f73<\/li>\n<\/ul>\n<p>\u901a\u5e38\u6765\u8bf4\uff0c\u53ea\u8981\u8fd9\u51e0\u4e2a\u6307\u6807\u6b63\u5e38\uff0c\u5176\u4ed6\u7684\u4e00\u822c\u4e0d\u4f1a\u6709\u95ee\u9898\uff0c\u5982\u679c\u5176\u4ed6\u5730\u65b9\u51fa\u4e86\u95ee\u9898\uff0c\u4e00\u822c\u90fd\u4f1a\u5f71\u54cd\u5230\u8fd9\u51e0\u4e2a\u6307\u6807\u3002<\/p>\n<h2><strong>4\u3001JVM \u4f18\u5316\u6b65\u9aa4\uff1f<\/strong><\/h2>\n<p><strong>4.1\u3001\u5206\u6790\u548c\u5b9a\u4f4d\u5f53\u524d\u7cfb\u7edf\u7684\u74f6\u9888<\/strong><\/p>\n<p>\u5bf9\u4e8eJVM\u7684\u6838\u5fc3\u6307\u6807\uff0c\u6211\u4eec\u7684\u5173\u6ce8\u70b9\u548c\u5e38\u7528\u5de5\u5177\u5982\u4e0b\uff1a<\/p>\n<p><strong>1\uff09CPU\u6307\u6807<\/strong><\/p>\n<ul>\n<li>\u67e5\u770b\u5360\u7528CPU\u6700\u591a\u7684\u8fdb\u7a0b<\/li>\n<li>\u67e5\u770b\u5360\u7528CPU\u6700\u591a\u7684\u7ebf\u7a0b<\/li>\n<li>\u67e5\u770b\u7ebf\u7a0b\u5806\u6808\u5feb\u7167\u4fe1\u606f<\/li>\n<li>\u5206\u6790\u4ee3\u7801\u6267\u884c\u70ed\u70b9<\/li>\n<li>\u67e5\u770b\u54ea\u4e2a\u4ee3\u7801\u5360\u7528CPU\u6267\u884c\u65f6\u95f4\u6700\u957f<\/li>\n<li>\u67e5\u770b\u6bcf\u4e2a\u65b9\u6cd5\u5360\u7528CPU\u65f6\u95f4\u6bd4\u4f8b<\/li>\n<\/ul>\n<p>\u5e38\u89c1\u7684\u547d\u4ee4\uff1a<\/p>\n<pre><code>\/\/ \u663e\u793a\u7cfb\u7edf\u5404\u4e2a\u8fdb\u7a0b\u7684\u8d44\u6e90\u4f7f\u7528\u60c5\u51b5\ntop\n\/\/ \u67e5\u770b\u67d0\u4e2a\u8fdb\u7a0b\u4e2d\u7684\u7ebf\u7a0b\u5360\u7528\u60c5\u51b5\ntop -Hp pid\n\/\/ \u67e5\u770b\u5f53\u524d Java \u8fdb\u7a0b\u7684\u7ebf\u7a0b\u5806\u6808\u4fe1\u606f\njstack pid<\/code><\/pre>\n<p>\u5e38\u89c1\u7684\u5de5\u5177\uff1aJProfiler\u3001JVM Profiler\u3001Arthas\u7b49\u3002<\/p>\n<p><strong>2\uff09JVM \u5185\u5b58\u6307\u6807<\/strong><\/p>\n<ul>\n<li>\u67e5\u770b\u5f53\u524d JVM \u5806\u5185\u5b58\u53c2\u6570\u914d\u7f6e\u662f\u5426\u5408\u7406<\/li>\n<li>\u67e5\u770b\u5806\u4e2d\u5bf9\u8c61\u7684\u7edf\u8ba1\u4fe1\u606f<\/li>\n<li>\u67e5\u770b\u5806\u5b58\u50a8\u5feb\u7167\uff0c\u5206\u6790\u5185\u5b58\u7684\u5360\u7528\u60c5\u51b5<\/li>\n<li>\u67e5\u770b\u5806\u5404\u533a\u57df\u7684\u5185\u5b58\u589e\u957f\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u67e5\u770b\u662f\u54ea\u4e2a\u533a\u57df\u5bfc\u81f4\u7684GC<\/li>\n<li>\u67e5\u770bGC\u540e\u80fd\u5426\u6b63\u5e38\u56de\u6536\u5230\u5185\u5b58<\/li>\n<\/ul>\n<p>\u5e38\u89c1\u7684\u547d\u4ee4\uff1a<\/p>\n<pre><code>\/\/ \u67e5\u770b\u5f53\u524d\u7684 JVM \u53c2\u6570\u914d\u7f6e\nps -ef | grep java\n\/\/ \u67e5\u770b Java \u8fdb\u7a0b\u7684\u914d\u7f6e\u4fe1\u606f\uff0c\u5305\u62ec\u7cfb\u7edf\u5c5e\u6027\u548cJVM\u547d\u4ee4\u884c\u6807\u5fd7\njinfo pid\n\/\/ \u8f93\u51fa Java \u8fdb\u7a0b\u5f53\u524d\u7684 gc \u60c5\u51b5\njstat -gc pid\n\/\/ \u8f93\u51fa Java \u5806\u8be6\u7ec6\u4fe1\u606f\njmap -heap pid\n\/\/ \u663e\u793a\u5806\u4e2d\u5bf9\u8c61\u7684\u7edf\u8ba1\u4fe1\u606f\njmap -histo:live pid\n\/\/ \u751f\u6210 Java \u5806\u5b58\u50a8\u5feb\u7167dump\u6587\u4ef6\njmap -F -dump:format=b,file=dumpFile.phrof pid<\/code><\/pre>\n<p>\u5e38\u89c1\u7684\u5de5\u5177\uff1aEclipse MAT\u3001JConsole\u7b49\u3002<\/p>\n<p><strong>3\uff09JVM GC\u6307\u6807<\/strong><\/p>\n<ul>\n<li>\u67e5\u770b\u6bcf\u5206\u949fGC\u65f6\u95f4\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u67e5\u770b\u6bcf\u5206\u949fYGC\u6b21\u6570\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u67e5\u770bFGC\u6b21\u6570\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u67e5\u770b\u5355\u6b21FGC\u65f6\u95f4\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u67e5\u770b\u5355\u6b21GC\u5404\u9636\u6bb5\u8be6\u7ec6\u8017\u65f6\uff0c\u627e\u5230\u8017\u65f6\u4e25\u91cd\u7684\u9636\u6bb5<\/li>\n<li>\u67e5\u770b\u5bf9\u8c61\u7684\u52a8\u6001\u664b\u5347\u5e74\u9f84\u662f\u5426\u6b63\u5e38<\/li>\n<\/ul>\n<p>JVM \u7684 GC\u6307\u6807\u4e00\u822c\u662f\u4ece GC \u65e5\u5fd7\u91cc\u9762\u67e5\u770b\uff0c\u9ed8\u8ba4\u7684 GC \u65e5\u5fd7\u53ef\u80fd\u6bd4\u8f83\u5c11\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u4ee5\u4e0b\u53c2\u6570\uff0c\u6765\u4e30\u5bcc\u6211\u4eec\u7684GC\u65e5\u5fd7\u8f93\u51fa\uff0c\u65b9\u4fbf\u6211\u4eec\u5b9a\u4f4d\u95ee\u9898\u3002<\/p>\n<p>GC\u65e5\u5fd7\u5e38\u7528 JVM \u53c2\u6570\uff1a<\/p>\n<pre><code class=\"language-cpp\">\/\/ \u6253\u5370GC\u7684\u8be6\u7ec6\u4fe1\u606f\n-XX:+PrintGCDetails\n\/\/ \u6253\u5370GC\u7684\u65f6\u95f4\u6233\n-XX:+PrintGCDateStamps\n\/\/ \u5728GC\u524d\u540e\u6253\u5370\u5806\u4fe1\u606f\n-XX:+PrintHeapAtGC\n\/\/ \u6253\u5370Survivor\u533a\u4e2d\u5404\u4e2a\u5e74\u9f84\u6bb5\u7684\u5bf9\u8c61\u7684\u5206\u5e03\u4fe1\u606f\n-XX:+PrintTenuringDistribution\n\/\/ JVM\u542f\u52a8\u65f6\u8f93\u51fa\u6240\u6709\u53c2\u6570\u503c\uff0c\u65b9\u4fbf\u67e5\u770b\u53c2\u6570\u662f\u5426\u88ab\u8986\u76d6\n-XX:+PrintFlagsFinal\n\/\/ \u6253\u5370GC\u65f6\u5e94\u7528\u7a0b\u5e8f\u7684\u505c\u6b62\u65f6\u95f4\n-XX:+PrintGCApplicationStoppedTime\n\/\/ \u6253\u5370\u5728GC\u671f\u95f4\u5904\u7406\u5f15\u7528\u5bf9\u8c61\u7684\u65f6\u95f4\uff08\u4ec5\u5728PrintGCDetails\u65f6\u542f\u7528\uff09\n-XX:+PrintReferenceGC<\/code><\/pre>\n<p>\u4ee5\u4e0a\u5c31\u662f\u6211\u4eec\u5b9a\u4f4d\u7cfb\u7edf\u74f6\u9888\u7684\u5e38\u7528\u624b\u6bb5\uff0c\u5927\u90e8\u5206\u95ee\u9898\u901a\u8fc7\u4ee5\u4e0a\u65b9\u5f0f\u90fd\u80fd\u5b9a\u4f4d\u51fa\u95ee\u9898\u539f\u56e0\uff0c\u7136\u540e\u7ed3\u5408\u4ee3\u7801\u53bb\u627e\u5230\u95ee\u9898\u6839\u6e90\u3002<\/p>\n<p><strong>4.2\u3001\u786e\u5b9a\u4f18\u5316\u76ee\u6807<\/strong><\/p>\n<p>\u5b9a\u4f4d\u51fa\u7cfb\u7edf\u74f6\u9888\u540e\uff0c\u5728\u4f18\u5316\u524d\u5148\u5236\u5b9a\u597d\u4f18\u5316\u7684\u76ee\u6807\u662f\u4ec0\u4e48\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u5c06FGC\u6b21\u6570\u4ece\u6bcf\u5c0f\u65f61\u6b21\uff0c\u964d\u4f4e\u52301\u59291\u6b21<\/li>\n<li>\u5c06\u6bcf\u5206\u949f\u7684GC\u8017\u65f6\u4ece3s\u964d\u4f4e\u5230500ms<\/li>\n<li>\u5c06\u6bcf\u6b21FGC\u8017\u65f6\u4ece5s\u964d\u4f4e\u52301s\u4ee5\u5185<\/li>\n<li>...<\/li>\n<\/ul>\n<p><strong>4.3\u3001\u5236\u8ba2\u4f18\u5316\u65b9\u6848<\/strong><\/p>\n<p>\u9488\u5bf9\u5b9a\u4f4d\u51fa\u7684\u7cfb\u7edf\u74f6\u9888\u5236\u5b9a\u76f8\u5e94\u7684\u4f18\u5316\u65b9\u6848\uff0c\u5e38\u89c1\u7684\u6709\uff1a<\/p>\n<ul>\n<li>\u4ee3\u7801bug\uff1a\u5347\u7ea7\u4fee\u590dbug\u3002\u5178\u578b\u7684\u6709\uff1a\u6b7b\u5faa\u73af\u3001\u4f7f\u7528\u65e0\u754c\u961f\u5217\u3002<\/li>\n<li>\u4e0d\u5408\u7406\u7684JVM\u53c2\u6570\u914d\u7f6e\uff1a\u4f18\u5316 JVM \u53c2\u6570\u914d\u7f6e\u3002\u5178\u578b\u7684\u6709\uff1a\u5e74\u8f7b\u4ee3\u5185\u5b58\u914d\u7f6e\u8fc7\u5c0f\u3001\u5806\u5185\u5b58\u914d\u7f6e\u8fc7\u5c0f\u3001\u5143\u7a7a\u95f4\u914d\u7f6e\u8fc7\u5c0f\u3002<\/li>\n<\/ul>\n<p><strong>4.4\u3001\u5bf9\u6bd4\u4f18\u5316\u524d\u540e\u7684\u6307\u6807\uff0c\u7edf\u8ba1\u4f18\u5316\u6548\u679c<\/strong><\/p>\n<p><strong>4.5\u3001\u6301\u7eed\u89c2\u5bdf\u548c\u8ddf\u8e2a\u4f18\u5316\u6548\u679c<\/strong><\/p>\n<p><strong>4.6\u3001\u5982\u679c\u8fd8\u9700\u8981\u7684\u8bdd\uff0c\u91cd\u590d\u4ee5\u4e0a\u6b65\u9aa4<\/strong><\/p>\n<h2><strong>5\u3001\u8c03\u4f18\u6848\u4f8b\uff1a<\/strong><strong>metaspace\u5bfc\u81f4\u9891\u7e41FGC\u95ee\u9898<\/strong><\/h2>\n<p>\u4ee5\u4e0b\u6848\u4f8b\u6765\u6e90\u4e8e\u7f51\u7edc\u6216\u672c\u4eba\u771f\u5b9e\u7ecf\u9a8c\uff0c\u7686\u80fd\u81ea\u5706\u5176\u8bf4\uff0c\u7406\u89e3\u638c\u63e1\u540e\u540c\u5b66\u4eec\u7686\u53ef\u62ff\u6765\u4e0e\u9762\u8bd5\u5b98\u5bf9\u7ebf\u3002<\/p>\n<p><strong>\u670d\u52a1\u73af\u5883\uff1a<\/strong>ParNew +&nbsp;CMS + JDK8<\/p>\n<p><strong>\u95ee\u9898\u73b0\u8c61<\/strong>\uff1a\u670d\u52a1\u9891\u7e41\u51fa\u73b0FGC<\/p>\n<p><strong>\u539f\u56e0\u5206\u6790<\/strong>\uff1a<\/p>\n<p>1\uff09\u9996\u5148\u67e5\u770bGC\u65e5\u5fd7\uff0c\u53d1\u73b0\u51fa\u73b0FGC\u7684\u539f\u56e0\u662fmetaspace\u7a7a\u95f4\u4e0d\u591f<\/p>\n<p>\u5bf9\u5e94GC\u65e5\u5fd7\uff1a<\/p>\n<pre><code>Full GC (Metadata GC Threshold)<\/code><\/pre>\n<p>2\uff09\u8fdb\u4e00\u6b65\u67e5\u770b\u65e5\u5fd7\u53d1\u73b0\u5143\u7a7a\u95f4\u5b58\u5728\u5185\u5b58\u788e\u7247\u5316\u73b0\u8c61<\/p>\n<p>\u5bf9\u5e94GC\u65e5\u5fd7\uff1a<\/p>\n<pre><code>Metaspace &nbsp; &nbsp; &nbsp; used 35337K, capacity 56242K, committed 56320K, reserved 1099776K<\/code><\/pre>\n<p>\u8fd9\u8fb9\u7b80\u5355\u89e3\u91ca\u4e0b\u8fd9\u51e0\u4e2a\u53c2\u6570\u7684\u610f\u4e49<\/p>\n<ul>\n<li>used \uff1a\u5df2\u4f7f\u7528\u7684\u7a7a\u95f4\u5927\u5c0f<\/li>\n<li>capacity\uff1a\u5f53\u524d\u5df2\u7ecf\u5206\u914d\u4e14\u672a\u91ca\u653e\u7684\u7a7a\u95f4\u5bb9\u91cf\u5927\u5c0f<\/li>\n<li>committed\uff1a\u5f53\u524d\u5df2\u7ecf\u5206\u914d\u7684\u7a7a\u95f4\u5927\u5c0f<\/li>\n<li>reserved\uff1a\u9884\u7559\u7684\u7a7a\u95f4\u5927\u5c0f<\/li>\n<\/ul>\n<p>\u8fd9\u8fb9&nbsp;used \u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\uff0creserved \u5728\u672c\u4f8b\u4e0d\u91cd\u8981\u53ef\u4ee5\u5148\u5ffd\u7565\uff0c\u4e3b\u8981\u662f capacity \u548c committed \u8fd92\u4e2a\u5bb9\u6613\u641e\u6df7\u3002<\/p>\n<p>\u7ed3\u5408\u4e0b\u56fe\u6765\u770b\u66f4\u5bb9\u6613\u7406\u89e3\uff0c\u5143\u7a7a\u95f4\u7684\u5206\u914d\u4ee5 chunk \u4e3a\u5355\u4f4d\uff0c\u5f53\u4e00\u4e2a ClassLoader \u88ab\u5783\u573e\u56de\u6536\u65f6\uff0c\u6240\u6709\u5c5e\u4e8e\u5b83\u7684\u7a7a\u95f4\uff08chunk\uff09\u88ab\u91ca\u653e\uff0c\u6b64\u65f6\u8be5 chunk \u79f0\u4e3a Free Chunk\uff0c\u800c committed chunk \u5c31\u662f capacity chunk \u548c free chunk \u4e4b\u548c\u3002<\/p>\n<p class=\"img-center\"><img decoding=\"async\" class=\"lazyload\"alt=\"\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/202307141440515a5ae14e9.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\"><noscript><img decoding=\"async\" alt=\"\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/202307141440515a5ae14e9.png\"><\/noscript><\/p>\n<p>\u4e4b\u6240\u4ee5\u8bf4\u5185\u5b58\u5b58\u5728\u788e\u7247\u5316\u73b0\u8c61\u5c31\u662f\u6839\u636e used \u548c capacity \u7684\u6570\u636e\u5f97\u6765\u7684\uff0c\u4e0a\u9762\u8bf4\u4e86\u5143\u7a7a\u95f4\u7684\u5206\u914d\u4ee5 chunk \u4e3a\u5355\u4f4d\uff0c\u5373\u4f7f\u4e00\u4e2a ClassLoader \u53ea\u52a0\u8f7d1\u4e2a\u7c7b\uff0c\u4e5f\u4f1a\u72ec\u5360\u6574\u4e2a chunk\uff0c\u6240\u4ee5\u5f53\u51fa\u73b0 used \u548c capacity \u4e24\u8005\u4e4b\u5dee\u8f83\u5927\u7684\u65f6\u5019\uff0c\u8bf4\u660e\u6b64\u65f6\u5b58\u5728\u5185\u5b58\u788e\u7247\u5316\u7684\u60c5\u51b5\u3002<\/p>\n<p>GC\u65e5\u5fd7demo\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-cpp\">{Heap before GC invocations=0 (full 0):\n par new generation   total 314560K, used 141123K [0x00000000c0000000, 0x00000000d5550000, 0x00000000d5550000)\n  eden space 279616K,  50% used [0x00000000c0000000, 0x00000000c89d0d00, 0x00000000d1110000)\n  from space 34944K,   0% used [0x00000000d1110000, 0x00000000d1110000, 0x00000000d3330000)\n  to   space 34944K,   0% used [0x00000000d3330000, 0x00000000d3330000, 0x00000000d5550000)\n concurrent mark-sweep generation total 699072K, used 0K [0x00000000d5550000, 0x0000000100000000, 0x0000000100000000)\n Metaspace       used 35337K, capacity 56242K, committed 56320K, reserved 1099776K\n  class space    used 4734K, capacity 8172K, committed 8172K, reserved 1048576K\n1.448: [Full GC (Metadata GC Threshold) 1.448: [CMS: 0K-&gt;10221K(699072K), 0.0487207 secs] 141123K-&gt;10221K(1013632K), [Metaspace: 35337K-&gt;35337K(1099776K)], 0.0488547 secs] [Times: user=0.09 sys=0.00, real=0.05 secs] \nHeap after GC invocations=1 (full 1):\n par new generation   total 314560K, used 0K [0x00000000c0000000, 0x00000000d5550000, 0x00000000d5550000)\n  eden space 279616K,   0% used [0x00000000c0000000, 0x00000000c0000000, 0x00000000d1110000)\n  from space 34944K,   0% used [0x00000000d1110000, 0x00000000d1110000, 0x00000000d3330000)\n  to   space 34944K,   0% used [0x00000000d3330000, 0x00000000d3330000, 0x00000000d5550000)\n concurrent mark-sweep generation total 699072K, used 10221K [0x00000000d5550000, 0x0000000100000000, 0x0000000100000000)\n Metaspace       used 35337K, capacity 56242K, committed 56320K, reserved 1099776K\n  class space    used 4734K, capacity 8172K, committed 8172K, reserved 1048576K\n}\n{Heap before GC invocations=1 (full 1):\n par new generation   total 314560K, used 0K [0x00000000c0000000, 0x00000000d5550000, 0x00000000d5550000)\n  eden space 279616K,   0% used [0x00000000c0000000, 0x00000000c0000000, 0x00000000d1110000)\n  from space 34944K,   0% used [0x00000000d1110000, 0x00000000d1110000, 0x00000000d3330000)\n  to   space 34944K,   0% used [0x00000000d3330000, 0x00000000d3330000, 0x00000000d5550000)\n concurrent mark-sweep generation total 699072K, used 10221K [0x00000000d5550000, 0x0000000100000000, 0x0000000100000000)\n Metaspace       used 35337K, capacity 56242K, committed 56320K, reserved 1099776K\n  class space    used 4734K, capacity 8172K, committed 8172K, reserved 1048576K\n1.497: [Full GC (Last ditch collection) 1.497: [CMS: 10221K-&gt;3565K(699072K), 0.0139783 secs] 10221K-&gt;3565K(1013632K), [Metaspace: 35337K-&gt;35337K(1099776K)], 0.0193983 secs] [Times: user=0.03 sys=0.00, real=0.02 secs] \nHeap after GC invocations=2 (full 2):\n par new generation   total 314560K, used 0K [0x00000000c0000000, 0x00000000d5550000, 0x00000000d5550000)\n  eden space 279616K,   0% used [0x00000000c0000000, 0x00000000c0000000, 0x00000000d1110000)\n  from space 34944K,   0% used [0x00000000d1110000, 0x00000000d1110000, 0x00000000d3330000)\n  to   space 34944K,   0% used [0x00000000d3330000, 0x00000000d3330000, 0x00000000d5550000)\n concurrent mark-sweep generation total 699072K, used 3565K [0x00000000d5550000, 0x0000000100000000, 0x0000000100000000)\n Metaspace       used 17065K, capacity 22618K, committed 35840K, reserved 1079296K\n  class space    used 1624K, capacity 2552K, committed 8172K, reserved 1048576K\n}<\/code><\/pre>\n<p>\u5143\u7a7a\u95f4\u4e3b\u8981\u9002\u7528\u4e8e\u5b58\u653e\u7c7b\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u800c\u5b58\u5728\u5185\u5b58\u788e\u7247\u5316\u8bf4\u660e\u5f88\u53ef\u80fd\u521b\u5efa\u4e86\u8f83\u591a\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u540c\u65f6\u4f7f\u7528\u7387\u8f83\u4f4e\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5f53\u5143\u7a7a\u95f4\u51fa\u73b0\u5185\u5b58\u788e\u7247\u5316\u65f6\uff0c\u6211\u4eec\u4f1a\u7740\u91cd\u5173\u6ce8\u662f\u4e0d\u662f\u521b\u5efa\u4e86\u5927\u91cf\u7684\u7c7b\u52a0\u8f7d\u5668\u3002<\/p>\n<p>3\uff09\u901a\u8fc7 dump \u5806\u5b58\u50a8\u6587\u4ef6\u53d1\u73b0\u5b58\u5728\u5927\u91cf DelegatingClassLoader<\/p>\n<p>\u901a\u8fc7\u8fdb\u4e00\u6b65\u5206\u6790\uff0c\u53d1\u73b0\u662f\u7531\u4e8e\u53cd\u5c04\u5bfc\u81f4\u521b\u5efa\u5927\u91cf&nbsp;DelegatingClassLoader\u3002\u5176\u6838\u5fc3\u539f\u7406\u5982\u4e0b\uff1a<\/p>\n<p>\u5728 JVM \u4e0a\uff0c\u6700\u521d\u662f\u901a\u8fc7 JNI \u8c03\u7528\u6765\u5b9e\u73b0\u65b9\u6cd5\u7684\u53cd\u5c04\u8c03\u7528\uff0c\u5f53&nbsp;JVM \u6ce8\u610f\u5230\u901a\u8fc7\u53cd\u5c04\u7ecf\u5e38\u8bbf\u95ee\u67d0\u4e2a\u65b9\u6cd5\u65f6\uff0c\u5b83\u5c06\u751f\u6210\u5b57\u8282\u7801\u6765\u6267\u884c\u76f8\u540c\u7684\u64cd\u4f5c\uff0c\u79f0\u4e3a\u81a8\u80c0\uff08inflation\uff09\u673a\u5236\u3002\u5982\u679c\u4f7f\u7528\u5b57\u8282\u7801\u7684\u65b9\u5f0f\uff0c\u5219\u4f1a\u4e3a\u8be5\u65b9\u6cd5\u751f\u6210\u4e00\u4e2a DelegatingClassLoader\uff0c\u5982\u679c\u5b58\u5728\u5927\u91cf\u65b9\u6cd5\u7ecf\u5e38\u53cd\u5c04\u8c03\u7528\uff0c\u5219\u4f1a\u5bfc\u81f4\u521b\u5efa\u5927\u91cf DelegatingClassLoader\u3002<\/p>\n<p><strong>\u53cd\u5c04\u8c03\u7528\u9891\u6b21\u8fbe\u5230\u591a\u5c11\u624d\u4f1a\u4ece JNI \u8f6c\u5b57\u8282\u7801\uff1f<\/strong><\/p>\n<p>\u9ed8\u8ba4\u662f15\u6b21\uff0c\u53ef\u901a\u8fc7\u53c2\u6570 -Dsun.reflect.inflationThreshold \u8fdb\u884c\u63a7\u5236\uff0c\u5728\u5c0f\u4e8e\u8be5\u6b21\u6570\u65f6\u4f1a\u4f7f\u7528 JNI \u7684\u65b9\u5f0f\u5bf9\u65b9\u6cd5\u8fdb\u884c\u8c03\u7528\uff0c\u5982\u679c\u8c03\u7528\u6b21\u6570\u8d85\u8fc7\u8be5\u6b21\u6570\u5c31\u4f1a\u4f7f\u7528\u5b57\u8282\u7801\u7684\u65b9\u5f0f\u751f\u6210\u65b9\u6cd5\u8c03\u7528\u3002<\/p>\n<p><strong>\u5206\u6790\u7ed3\u8bba<\/strong>\uff1a\u53cd\u5c04\u8c03\u7528\u5bfc\u81f4\u521b\u5efa\u5927\u91cf&nbsp;DelegatingClassLoader\uff0c\u5360\u7528\u4e86\u8f83\u5927\u7684\u5143\u7a7a\u95f4\u5185\u5b58\uff0c\u540c\u65f6\u5b58\u5728\u5185\u5b58\u788e\u7247\u5316\u73b0\u8c61\uff0c\u5bfc\u81f4\u5143\u7a7a\u95f4\u5229\u7528\u7387\u4e0d\u9ad8\uff0c\u4ece\u800c\u8f83\u5feb\u8fbe\u5230\u9608\u503c\uff0c\u89e6\u53d1 FGC\u3002<\/p>\n<p><strong>\u4f18\u5316\u7b56\u7565\uff1a<\/strong><\/p>\n<p>1\uff09\u9002\u5f53\u8c03\u5927&nbsp;metaspace \u7684\u7a7a\u95f4\u5927\u5c0f\u3002<\/p>\n<p>2\uff09\u4f18\u5316\u4e0d\u5408\u7406\u7684\u53cd\u5c04\u8c03\u7528\u3002\u4f8b\u5982\u6700\u5e38\u89c1\u7684\u5c5e\u6027\u62f7\u8d1d\u5de5\u5177\u7c7b&nbsp;BeanUtils.copyProperties \u53ef\u4ee5\u4f7f\u7528 mapstruct \u66ff\u6362\u3002<\/p>\n<h1><strong>\u603b\u7ed3<\/strong><\/h1>\n<p>\u5f53\u88ab\u9762\u8bd5\u5b98\u95ee\u5230 JVM \u8c03\u4f18\u65f6\uff0c\u5b8c\u5168\u53ef\u4ee5\u6309\u7167\u672c\u6587\u7684\u8109\u7edc\u56de\u7b54\uff1a<\/p>\n<ul>\n<li>\u9996\u5148\u8868\u6001\u5982\u679c\u4f7f\u7528\u5408\u7406\u7684 JVM \u53c2\u6570\u914d\u7f6e\uff0c\u5728\u5927\u591a\u6570\u60c5\u51b5\u5e94\u8be5\u662f\u4e0d\u9700\u8981\u8c03\u4f18\u7684\u2014\u2014\u5bf9\u5e94\u672c\u6587\u7b2c1\u9898<\/li>\n<li>\u5176\u6b21\u8bf4\u660e\u53ef\u80fd\u8fd8\u662f\u5b58\u5728\u5c11\u91cf\u573a\u666f\u9700\u8981\u8c03\u4f18\uff0c\u6211\u4eec\u53ef\u4ee5\u5bf9\u4e00\u4e9b JVM \u6838\u5fc3\u6307\u6807\u914d\u7f6e\u76d1\u63a7\u544a\u8b66\uff0c\u5f53\u51fa\u73b0\u6ce2\u52a8\u65f6\u4eba\u4e3a\u4ecb\u5165\u5206\u6790\u8bc4\u4f30\u2014\u2014\u5bf9\u5e94\u672c\u6587\u7b2c3\u9898<\/li>\n<li>\u6700\u540e\u4e3e\u4e00\u4e2a\u5b9e\u9645\u7684\u8c03\u4f18\u4f8b\u5b50\u6765\u52a0\u4ee5\u8bf4\u660e\u2014\u2014\u5bf9\u5e94\u672c\u6587\u7b2c5\u9898<\/li>\n<\/ul>\n<p>\u5982\u679c\u9762\u8bd5\u5b98\u53cd\u95ee\u600e\u4e48\u5206\u6790\u6392\u67e5\u7684\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u672c\u6587\u7b2c4\u9898\u7684\u5e38\u7528\u547d\u4ee4\u548c\u5de5\u5177\u6765\u4e0e\u4e4b\u5bf9\u7ebf\u3002<\/p>\n<p>\u8fd9\u4e00\u5957\u6d41\u7a0b\u4e0b\u6765\uff0c\u6211\u76f8\u4fe1\u5927\u90e8\u5206\u9762\u8bd5\u5b98\u90fd\u4f1a\u5bf9\u4f60\u5370\u8c61\u4e0d\u9519\u3002<\/p>\n<p>\u200b<\/p>\n<h1><strong>\u6700\u540e<\/strong><\/h1>\n<p>\u6211\u662f\u56e7\u8f89\uff0c<strong>\u4e00\u4e2a\u575a\u6301\u5206\u4eab\u539f\u521b\u6280\u672f\u5e72\u8d27\u7684\u7a0b\u5e8f\u5458<\/strong>\uff0c\u5982\u679c\u89c9\u5f97\u672c\u6587\u5bf9\u4f60\u6709\u5e2e\u52a9\uff0c\u8bb0\u5f97\u70b9\u8d5e\u5173\u6ce8\uff0c\u6211\u4eec\u4e0b\u671f\u518d\u89c1\u3002<\/p>\n<h1><strong>\u63a8\u8350\u9605\u8bfb<\/strong><\/h1>\n<p><a href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzI5NjY4MDA1NQ==&amp;mid=2247485730&amp;idx=1&amp;sn=9aa6d2dfe240c0377f93d6cccbce58bf&amp;chksm=ec41e63adb366f2c9bd283cbefd5cfc9183897f87a7d814d47ae14e444b79ad8fe10090e5172&amp;scene=21#wechat_redirect\" title=\"Java \u57fa\u7840\u9ad8\u9891\u9762\u8bd5\u9898\uff082021\u5e74\u6700\u65b0\u7248\uff09\" target=\"_blank\"  rel=\"nofollow\" >Java \u57fa\u7840\u9ad8\u9891\u9762\u8bd5\u9898\uff082021\u5e74\u6700\u65b0\u7248\uff09<\/a><\/p>\n<p><a href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzI5NjY4MDA1NQ==&amp;mid=2247485813&amp;idx=1&amp;sn=28adaabfdae80acdf1d931bd4e81f323&amp;chksm=ec41e66ddb366f7b83312f077f07790c6634aa34f260821141ba4467053f97bdf665bb705749&amp;scene=21#wechat_redirect\" title=\"Java \u96c6\u5408\u6846\u67b6\u9ad8\u9891\u9762\u8bd5\u9898\uff082021\u5e74\u6700\u65b0\u7248\uff09\" target=\"_blank\"  rel=\"nofollow\" >Java \u96c6\u5408\u6846\u67b6\u9ad8\u9891\u9762\u8bd5\u9898\uff082021\u5e74\u6700\u65b0\u7248\uff09<\/a><\/p>\n<p><a href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzI5NjY4MDA1NQ==&amp;mid=2247485484&amp;idx=1&amp;sn=1c16df6001b2d9d6d73801e8adbd479b&amp;chksm=ec41e734db366e22479217437cd36f003875abb076442badf3c6b23344b077c6d83ae22fdb7e&amp;scene=21#wechat_redirect\" title=\"\u9762\u8bd5\u5fc5\u95ee\u7684 Spring\uff0c\u4f60\u61c2\u4e86\u5417\uff1f\" target=\"_blank\"  rel=\"nofollow\" >\u9762\u8bd5\u5fc5\u95ee\u7684 Spring\uff0c\u4f60\u61c2\u4e86\u5417\uff1f<\/a><\/p>\n<p><a href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzI5NjY4MDA1NQ==&amp;mid=2247485226&amp;idx=1&amp;sn=fe9e1dfc991d447e460a00dce9544269&amp;chksm=ec41e832db366124c70e36e2875874dc73d9dca08a463fd71249680e0e708b80b14b27b5fa41&amp;scene=21#wechat_redirect\" title=\"\u9762\u8bd5\u5fc5\u95ee\u7684 MySQL\uff0c\u4f60\u61c2\u4e86\u5417\uff1f\" target=\"_blank\"  rel=\"nofollow\" >\u9762\u8bd5\u5fc5\u95ee\u7684 MySQL\uff0c\u4f60\u61c2\u4e86\u5417\uff1f<\/a><\/p>\n<\/div>\n<p>\u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8eCSDN\uff1ahttps:\/\/blog.csdn.net\/v123411739\/article\/details\/123778478<\/p>\n","raw":"","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u9762\u8bd5\u5b98\uff1a\u5728\u5de5\u4f5c\u4e2d\u505a\u8fc7 JVM \u8c03\u4f18\u5417\uff1f\u8bb2\u8bb2\u505a\u8fc7\u54ea\u4e9b JVM \u8c03\u4f18\uff1f \u6211\u4e00\u4e2aQPS\u4e0d\u523010\u7684\u9879\u76ee\uff0c\u4e0a\u6b21\u95ee\u6211\u7f13\u5b58\u7a7f\u900f\u7f13\u5b58\u96ea\u5d29\uff0c\u8fd9 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[27],"tags":[],"class_list":["post-2916","post","type-post","status-publish","format-standard","hentry","category-jvm"],"post_thumbnail_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","content_first_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","post_medium_image_300":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","post_thumbnail_image_624":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","post_frist_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","post_medium_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","post_large_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","post_full_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","post_all_images":[{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","id":"image0"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-50\/20230714144050fdfdede67.png","id":"image1"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/20230714144051c4c4b18a9.png","id":"image2"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/20230714144051c4c4b18a9.png","id":"image3"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/202307141440515a5ae14e9.png","id":"image4"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/14-40-51\/202307141440515a5ae14e9.png","id":"image5"}],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"JVM","post_date":"2023-07-14","like_count":"0","praiseWord":"\u9f13\u52b1","copyright_state":"","excitationAd":"0","rewardedVideoAdId":"","detailAdId":"","detailAd":"0","enterpriseMinapp":"0","audios":[],"postImageUrl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230519082947553.jpg","avatarurls":[],"related_posts":null,"pageviews":392,"next_post_id":2920,"next_post_title":"JVM(\u5185\u5b58\u5212\u5206+\u7c7b\u52a0\u8f7d+GC)","previous_post_id":2910,"previous_post_title":"JVM\uff08Java\u865a\u62df\u673a\uff09-\u53f2\u4e0a\u6700\u5168\u3001\u6700\u8be6\u7ec6JVM\u7b14\u8bb0","_links":{"self":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/2916","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2916"}],"version-history":[{"count":0,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/2916\/revisions"}],"wp:attachment":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}