{"id":10008141,"date":"2023-08-23T13:01:18","date_gmt":"2023-08-23T05:01:18","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008141"},"modified":"2023-08-23T13:01:18","modified_gmt":"2023-08-23T05:01:18","slug":"%e5%bd%93%e5%b0%8f%e7%99%bd%e9%81%87%e5%88%b0fullgc-%e4%ba%ac%e4%b8%9c%e4%ba%91%e6%8a%80%e6%9c%af%e5%9b%a2%e9%98%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008141","title":{"rendered":"\u5f53\u5c0f\u767d\u9047\u5230FullGC | \u4eac\u4e1c\u4e91\u6280\u672f\u56e2\u961f"},"content":{"rendered":"<blockquote><p>\u8d77\u521d\u6ca1\u6709\u4eba\u5728\u610f\u8fd9\u573aGC,\u76f4\u5230\u5b83\u5f71\u54cd\u5230\u4e86\u6bcf\u4e00\u5929!<\/p><\/blockquote>\n<h2>\u524d\u8a00<\/h2>\n<p>\u672c\u6587\u8bb0\u5f55\u4e86\u4e00\u6b21\u6392\u67e5FullGC\u5bfc\u81f4\u7684TP99\u8fc7\u9ad8\u8fc7\u7a0b,\u4ecb\u7ecd\u4e86\u4e00\u4e9b\u6392\u67e5\u65f6\u601d\u8def,\u7ebf\u7d22\u4ee5\u53ca\u5de5\u5177\u7684\u4f7f\u7528,\u5e0c\u671b\u80fd\u591f\u5e2e\u52a9\u4e00\u4e9b\u65b0\u624b\u5728\u6392\u67e5\u95ee\u9898\u6ca1\u6709\u5f88\u597d\u7684\u601d\u8def\u65f6,\u63d0\u4f9b\u4e00\u4e9b\u601d\u8def,\u8ba9\u5c0f\u767d\u4e5f\u80fd\u8f7b\u677e\u89e3\u51b3FullGC\u95ee\u9898,\u6587\u4e2d\u5b9e\u9645\u63d0\u5230\u7684\u53c2\u6570\u914d\u7f6e\u4e0d\u4e00\u5b9a\u9002\u5408\u5176\u4ed6\u4e1a\u52a1\u573a\u666f,\u5728\u8c03\u4f18\u81ea\u5df1\u7684\u9879\u76ee\u65f6\u8fd8\u662f\u9700\u8981\u5b9e\u9645\u8bd5\u9a8c\u8fc7\u624d\u80fd\u5f97\u51fa\u6700\u4f73\u53c2\u6570\u914d\u7f6e<\/p>\n<p>\u6211\u4e5f\u662f\u5c0f\u767d,\u5982\u6709\u4e0d\u5408\u7406\u7684\u5730\u65b9,\u6b22\u8fce\u5927\u4f6c\u4eec\u8fdb\u884c\u6307\u6b63<\/p>\n<p>\u56e0\u4e3a\u7ebf\u4e0a\u670d\u52a1\u5668,\u6211\u4eec\u5927\u90e8\u5206\u662f\u6ca1\u6709SSH\u6743\u9650\u7684,\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u6267\u884c\u547d\u4ee4\u83b7\u53d6\u5bb9\u5668\u4fe1\u606f,\u6240\u4ee5\u6392\u67e5\u8fc7\u7a0b\u4e2d\u53ea\u80fd\u501f\u52a9\u5e73\u53f0\u63d0\u4f9b\u7684\u5de5\u5177,\u5e73\u53f0\u63d0\u4f9b\u7684\u5de5\u5177\u8fd8\u662f\u633a\u5168\u7684,\u672c\u6587\u4e3b\u8981\u7528\u5230\u7684\u5de5\u5177\u6709: JDOS\u5bb9\u5668\u667a\u80fd\u76d1\u63a7,JDOS\u8fdb\u7a0b\u67e5\u8be2,SGM\u5bb9\u5668\u76d1\u63a7\u4fe1\u606f,SGM\u65b9\u6cd5\u8c03\u7528\u67e5\u8be2<\/p>\n<p>\u4ee5\u4e0b\u51e0\u4e2a\u5de5\u5177\u7b80\u5355\u4ecb\u7ecd:<\/p>\n<pre><code>http:\/\/sgm-server.jd.com\/\nhttp:\/\/jagile.jd.com\/jdosCD\/jdt\/apps\nJDOS\u5bb9\u5668\u667a\u80fd\u76d1\u63a7: \u67e5\u770b\u5bb9\u5668\u7684CPU,\u5185\u5b58,\u78c1\u76d8,IO\u7b49\u4fe1\u606f\nJDOS\u8fdb\u7a0b\u67e5\u8be2: \u67e5\u770bJava\u8fdb\u7a0b\u7f16\u53f7,\u6267\u884c\u5e38\u7528\u7684Java\u5185\u5b58\u8fdb\u7a0b\u67e5\u770b\u547d\u4ee4\nSGM\u5bb9\u5668\u76d1\u63a7\u4fe1\u606f: \u67e5\u770bJVM\u865a\u62df\u673a\u5185\u5b58\u53d8\u66f4\u5386\u53f2\u8bb0\u5f55\nSGM\u65b9\u6cd5\u8c03\u7528\u67e5\u8be2: \u67e5\u770b\u67d0\u4e00\u6b21\u5173\u952e\u63a5\u53e3\u8c03\u7528\u7684\u4e0a\u4e0b\u4f9d\u8d56,\u65f6\u95f4\u5206\u5e03\n\n\n<\/code><\/pre>\n<h2>\u8d77\u56e0 &#8211; \u5076\u5c14\u51fa\u73b0\u63a5\u53e3\u8d85\u65f6<\/h2>\n<p>\u4e00\u5f00\u59cb\u5076\u5c14\u4f1a\u6536\u5230\u62a5\u8b66\u90ae\u4ef6,\u663e\u793a\u6709\u4e9b\u63a5\u53e3\u8c03\u7528\u65f6\u95f4\u6bd4\u8f83\u957f,\u62bd\u67e5\u4e86\u4e00\u4e9b\u63a5\u53e3,\u53d1\u73b0\u5927\u90e8\u5206\u90fd\u662f\u8c03\u7528\u4e0b\u6e38JSF\u65f6\u95f4\u6bd4\u8f83\u957f,\u5bfc\u81f4\u54cd\u5e94\u6bd4\u8f83\u6162,\u8fd9\u65f6\u5019\u5c31\u6ca1\u592a\u5728\u610f,\u63a5\u4e0b\u6765\u7ee7\u7eed\u89c2\u5bdf\u4e86\u51e0\u5929,\u53d1\u73b0\u4e00\u4e2a\u89c4\u5f8b,\u5927\u90e8\u5206\u90ae\u4ef6\u90fd\u662f\u6bcf\u592910\u70b9<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141603\" alt=\"\" title=\"\"><\/p>\n<h2>\u6392\u67e5\u5b9a\u4f4d\u95ee\u9898<\/h2>\n<ol>\n<li>\u9996\u5148\u786e\u8ba4\u4e8610\u70b9\u8fd9\u4e2a\u65f6\u95f4\u70b9\u6709\u6ca1\u6709\u5b9a\u65f6\u4efb\u52a1\u4e4b\u7c7b\u7684\u64cd\u4f5c,\u7ecf\u8fc7\u8be2\u95ee\u786e\u5b9a\u8fd9\u4e2a\u65f6\u95f4\u70b9\u662f\u4ed3\u5e93\u51fa\u5e93\u9ad8\u5cf0\u671f,\u5bfc\u81f4\u4e1a\u52a1\u91cf\u51fa\u73b0\u5cf0\u503c(\u8c03\u7528\u91cf\u53d8\u5927\u53ef\u80fd\u662f\u6fc0\u53d1FullGC\u95ee\u9898,\u6210\u4e3a\u95ee\u9898\u66b4\u6f0f\u7684\u5bfc\u706b\u7ebf)<\/li>\n<li>\u7b2c\u4e8c\u90e8\u5c31\u662f\u786e\u8ba4\u662f\u6570\u636e\u5e93\u539f\u56e0,\u8fd8\u662f\u4e1a\u52a1\u4ee3\u7801,\u8fd8\u662fJSF\u4e0b\u6e38\u63a5\u53e3\u8fbe\u5230\u6781\u9650\u539f\u56e0,\u5230\u8fd9\u4e00\u6b65\u8fd8\u662f\u672a\u77e5\u7684,\u5728\u8fd9\u7528\u5230\u4e86SGM\u7684\u63a5\u53e3\u8c03\u7528\u67e5\u8be2\u5de5\u5177,\u4e0b\u56fe\u4e2d\u6211\u4eec\u770b\u5230,\u8fd9\u6b21\u8c03\u7528JSF\u4e5f\u662f\u633a\u9ad8\u7684(\u8fd9\u4e2a\u6ca1\u6709\u592a\u597d\u529e\u6cd5,\u9664\u975e\u8ba9\u4e0b\u6e38\u4f18\u5316,\u6240\u4ee5\u6682\u65f6\u5ffd\u7565),\u4f46\u662f\u8fd8\u6709\u4e00\u4e2a\u662flogic,\u8fd9\u4e2a\u5c31\u662f\u903b\u8f91\u5904\u7406,\u5982\u679c\u6ca1\u6709\u90a3\u4e2aFullGC\u63d0\u793a,\u5c31\u9700\u8981\u53bb\u5206\u6790\u4ee3\u7801\u7684\u5904\u7406\u662f\u5426\u6709\u95ee\u9898,\u8fd9\u901a\u8fc7\u90a3\u884c\u7ea2\u8272\u5b57\u4f53\u7684\u63d0\u793a,\u5f88\u663e\u7136\u6211\u4eec\u786e\u5b9a\u4e86\u662fFullGC\u5bfc\u81f4\u7684\u95ee\u9898<\/li>\n<li>\u6211\u4eec\u53bb\u67e5\u770b\u4e00\u4e0b\u5bb9\u5668\u7684FullGC\u60c5\u51b5,\u786e\u5b9e\u53d1\u73b0\u8fd9\u4e2a\u65f6\u95f4\u70b9\u7684FullGC\u7279\u522b\u9891\u7e41,\u5230\u6b64\u5df2\u7ecf\u628a\u95ee\u9898\u8303\u56f4\u5b9a\u4f4d\u5230\u5c31\u662fFullGC\u5bfc\u81f4\u7684<\/li>\n<\/ol>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141604\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141605\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141606\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<h2>FullGC\u95ee\u9898\u6392\u67e5<\/h2>\n<h4>Full GC \u89e6\u53d1\u6761\u4ef6\uff1a<\/h4>\n<p>\u5230\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u786e\u5b9a\u4e00\u4e2a\u95ee\u9898 : \u201c\u89e6\u53d1FullGC\u7684\u6761\u4ef6\u662f\u4ec0\u4e48\uff1f\u201d\uff0c\u65b0\u624b\u53ef\u4ee5\u53bb\u535a\u5ba2\u641c\u7d22\uff0c\u5f53\u7136\u6700\u597d\u662f\u80fd\u8bb0\u4f4f\u8fd9\u4e2a\u77e5\u8bc6\u70b9\u3002\u6ce8\u610f\u8fd9\u4e0d\u662f\u786e\u5b9a\u201c\u4ec0\u4e48\u539f\u56e0\u5bfc\u81f4\u7684FullGC\uff1f\u201d\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u95ee\u9898\u539f\u56e0\u592a\u591a\u4e86\uff0c\u6211\u4eec\u8981\u4e00\u6b65\u4e00\u6b65\u6392\u67e5\u3002 \u4e0b\u9762\u662f\u6211\u67e5\u5230\u7684\u8d44\u6599\uff0c\u7c98\u5230\u8fd9\u91cc\u4f9b\u53c2\u8003.<\/p>\n<ol>\n<li>Minor GC\u89e6\u53d1\u6761\u4ef6\uff1a\u5f53Eden\u533a\u6ee1\u65f6\uff0c\u89e6\u53d1Minor GC\u3002<\/li>\n<li>Full GC\u89e6\u53d1\u6761\u4ef6\uff1a<\/li>\n<\/ol>\n<ul>\n<li>\uff081\uff09\u8c03\u7528System.gc()\u65f6\uff0c\u7cfb\u7edf\u5efa\u8bae\u6267\u884cFull GC\uff0c\u4f46\u662f\u4e0d\u5fc5\u7136\u6267<\/li>\n<li>\uff082\uff09\u8001\u5e74\u4ee3\u7a7a\u95f4\u4e0d\u8db3<\/li>\n<li>\uff083\uff09\u65b9\u6cd5\u533a\u7a7a\u95f4\u4e0d\u8db3<\/li>\n<li>\uff084\uff09\u901a\u8fc7Minor GC\u540e\u8fdb\u5165\u8001\u5e74\u4ee3\u7684\u5e73\u5747\u5927\u5c0f\u5927\u4e8e\u8001\u5e74\u4ee3\u7684\u53ef\u7528\u5185\u5b58<\/li>\n<li>\uff085\uff09\u7531Eden\u533a\u3001From Space\u533a\u5411To Space\u533a\u590d\u5236\u65f6\uff0c\u5bf9\u8c61\u5927\u5c0f\u5927\u4e8eTo Space\u53ef\u7528\u5185\u5b58\uff0c\u5219\u628a\u8be5\u5bf9\u8c61\u8f6c\u5b58\u5230\u8001\u5e74\u4ee3<\/li>\n<\/ul>\n<p>\u8fd9\u91cc\u5728\u4ee3\u7801\u4e2d\u5e76\u6ca1\u6709\u627e\u5230System.gc()\u7684\u663e\u793a\u8c03\u7528,\u4e00\u822c\u6211\u4eec\u4e5f\u4e0d\u4f1a\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5,\u6240\u4ee5\u6211\u4eec\u76f4\u63a5\u770b\u7b2c\u4e8c\u79cd\u60c5\u51b5,\u5230SGM\u4e2d\u67e5\u770b\u8001\u5e74\u4ee3\u53d8\u5316,\u7ed3\u679c\u53d1\u73b0\u8001\u5e74\u4ee3\u9891\u7e41\u8fbe\u523090%,\u800c\u8fd9\u4e2a\u65f6\u95f4\u6b63\u597d\u53ef\u4ee5\u8ddf\u4e0a\u9762GC\u65f6\u95f4\u5bf9\u4e0a.<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141607\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<h4>\u5bf9\u8c61\u8fdb\u5165\u8001\u5e74\u4ee3\u7684\u51e0\u79cd\u60c5\u51b5<\/h4>\n<p>\u6211\u4eec\u90fd\u77e5\u9053,\u8001\u5e74\u4ee3\u7684\u5bf9\u8c61\u5e94\u8be5\u662f\u5b58\u6d3b\u65f6\u95f4\u5f88\u957f\u7684\u5bf9\u8c61,\u4f46\u662f\u6211\u4eec\u53d1\u73b0\u8fd9\u4e9b\u5bf9\u8c61\u90fd\u5728FullGC\u65f6\u88ab\u91ca\u653e\u6389\u4e86,\u4ed6\u4eec\u4e3a\u4ec0\u4e48\u5230\u4e86\u8001\u5e74\u4ee3\u5462? \u8fd9\u65f6\u5019\u6211\u4eec\u9700\u8981\u786e\u5b9a\u7684\u7b2c\u4e8c\u4e2a\u95ee\u9898\u662f:\u201c\u4ec0\u4e48\u60c5\u51b5\u4e0b\u5bf9\u8c61\u4f1a\u8fdb\u5165\u8001\u5e74\u4ee3\uff1f\u201d \u67e5\u8d44\u6599\u540e\u6709\u4ee5\u4e0b\u51e0\u79cd\u60c5\u51b5<\/p>\n<ol>\n<li>\u5e74\u9f84\u591f\u4e86: \u8eb2\u8fc715\u6b21(\u9ed8\u8ba4\u914d\u7f6e\u662f15\u6b21) minorGC \u4e4b\u540e\u4ece\u65b0\u751f\u4ee3\u8fdb\u5165\u8001\u5e74\u4ee3\uff1b<\/li>\n<li>\u5927\u5bf9\u8c61: \u5927\u5bf9\u8c61\u76f4\u63a5\u8fdb\u5165\u8001\u5e74\u4ee3\u3002\u6709\u4e00\u4e2a JVM \u53c2\u6570 &#8216;-XX:PretenureSizeThreshold&#8217; \u8bbe\u7f6e\u503c\u4e3a\u5b57\u8282\u6570\uff0c\u521b\u5efa\u8d85\u8fc7\u8be5\u5927\u5c0f\u7684\u5bf9\u8c61\u76f4\u63a5\u8fdb\u5165\u8001\u5e74\u4ee3,\u5982\u679c\u6ca1\u6709\u914d\u7f6e\u8fd9\u4e2a\u53c2\u6570,\u8fd9\u4e2a\u503c\u597d\u50cf\u9ed8\u8ba4\u662f1M\u3002<\/li>\n<li>\u52a8\u6001\u5e74\u9f84\u5224\u65ad\uff1a\u5f53\u524d\u653e\u5bf9\u8c61\u7684 Survivor \u533a\uff0c\u76f8\u540c\u5e74\u9f84\u7684\u4e00\u6279\u5bf9\u8c61\uff08\u4ee5\u53ca\u5c0f\u4e8e\u8be5\u5e74\u9f84\uff09\u7684\u603b\u5185\u5b58\u5927\u4e8e\u8be5\u533a\u7684\u5185\u5b58\u768450%\uff0c\u5927\u4e8e\u8be5\u5e74\u9f84\u7684\u5176\u4ed6\u8001\u5bf9\u8c61\uff0c\u5c31\u4f1a\u8fdb\u5165\u8001\u5e74\u4ee3\uff08\u4f8b\u59821,2,3\u5c81\u5e74\u9f84\u7684\u5bf9\u8c61\u5360\u4e86 S \u533a\u768450%\u4ee5\u4e0a\uff0c\u5c31\u4f1a\u628a\u5927\u4e8e3\u5c81\u7684\u5bf9\u8c61\u79fb\u52a8\u5230\u8001\u5e74\u4ee3\u53bb\u3002\u6240\u4ee5\u5c3d\u91cf\u8ba9 S \u533a\u4e2d\u7684\u5bf9\u8c61\uff0c\u5360\u6bd4\u5c3d\u91cf\u5c11\u4e8e 50%\uff09\uff1b<\/li>\n<li>\u5269\u7684\u603b\u91cf\u592a\u591a: Eden \u533a\u5b58\u6d3b\u5bf9\u8c61\u592a\u591a\uff0c\u8d85\u8fc7\u4e86 Survivor \u7684\u5927\u5c0f\uff0c\u5c31\u76f4\u63a5\u628a\u8fd9\u4e9b\u5bf9\u8c61\u90fd\u8f6c\u79fb\u5230\u8001\u5e74\u4ee3\u53bb\u3002\uff08JDK1.8 \u7a7a\u95f4\u62c5\u4fdd\u673a\u5236\uff09<\/li>\n<\/ol>\n<p>\u9996\u5148\u5206\u6790\u7b2c\u4e00\u79cd\u60c5\u51b5,\u5982\u679c\u51fa\u73b0\u5927\u6279\u91cf\u8fd9\u6837\u7684\u5bf9\u8c61,\u4ee3\u7801\u4e2d\u51fa\u73b0\u4e86\u957f\u65f6\u95f4\u5f15\u7528(\u4f8b\u5982:\u9759\u6001Map\u53ea\u52a0\u4e0d\u5220),\u4f46\u662f\u6211\u4eec\u53ef\u4ee5\u770b\u5230,\u8fd9\u4e9b\u5bf9\u8c61\u5728\u6bcf\u6b21FullGC\u90fd\u88ab\u91ca\u653e\u6389\u4e86,\u8bf4\u660e\u8fd9\u6279\u5bf9\u8c61\u5b58\u6d3b\u7684\u65f6\u95f4\u5e76\u4e0d\u957f, \u800c\u4e14\u4ee3\u7801\u6392\u67e5\u4e5f\u6ca1\u53d1\u73b0\u8fd9\u79cd\u4ee3\u7801,\u6682\u65f6\u6392\u9664\u8fd9\u79cd\u60c5\u51b5(\u8fd9\u7684\u4ee3\u7801\u56e0\u4e3a\u662f\u5de5\u5177\u5305\u7684\u4ee3\u7801,\u6240\u4ee5\u6ca1\u6709\u592a\u6df1\u7ea0,\u8fd9\u4e3a\u7eed\u96c6\u7559\u4e2a\u4f0f\u7b14). \u7b2c\u4e8c\u79cd\u60c5\u51b5,\u5927\u5bf9\u8c61,\u6211\u4eec\u5230JDOS\u4e0b\u8f7d\u4e0b\u6765JMap-dump\u5185\u5b58\u5feb\u7167\u548cJMap-Histo\u5bf9\u8c61\u7edf\u8ba1\u4fe1\u606f,\u7ecf\u8fc7\u5bf9FullGC\u94b1dump\u5206\u6790,\u7ed3\u5408GC\u524dGC\u540e\u5bf9\u8c61\u7edf\u8ba1\u7ed3\u679c,\u5e76\u6ca1\u6709\u53d1\u73b0\u5927\u91cf\u7684\u5927\u5bf9\u8c61,\u8fd9\u4e2a\u57fa\u672c\u4e5f\u6392\u9664<\/p>\n<blockquote><p>\u901a\u8fc7JMAT(Eclipse Memory Analysis Tools)\u5bfc\u5165dump\u6587\u4ef6\u8fdb\u884c\u5206\u6790\uff0c\u5185\u5b58\u6cc4\u6f0f\u95ee\u9898\u4e00\u822c\u6211\u4eec\u76f4\u63a5\u9009Leak Suspects\u5373\u53ef\uff0cmat\u7ed9\u51fa\u4e86\u5185\u5b58\u6cc4\u6f0f\u7684\u5efa\u8bae\u3002\u53e6\u5916\u4e5f\u53ef\u4ee5\u9009\u62e9Top Consumers\u6765\u67e5\u770b\u6700\u5927\u5bf9\u8c61\u62a5\u544a\u3002\u548c\u7ebf\u7a0b\u76f8\u5173\u7684\u95ee\u9898\u53ef\u4ee5\u9009\u62e9thread overview\u8fdb\u884c\u5206\u6790\u3002\u9664\u6b64\u4e4b\u5916\u5c31\u662f\u9009\u62e9Histogram\u7c7b\u6982\u89c8\u6765\u81ea\u5df1\u6162\u6162\u5206\u6790\uff0c\u5927\u5bb6\u53ef\u4ee5\u641c\u641cmat\u7684\u76f8\u5173\u6559\u7a0b\u3002<\/p><\/blockquote>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141608\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141609\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141610\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u63a5\u4e0b\u6765\u5c31\u662f\u7b2c\u4e09\u79cd\u548c\u7b2c\u56db\u79cd\u60c5\u51b5,\u8fd9\u65f6\u5019\u6211\u4eec\u9700\u8981\u53d6\u67e5\u770b\u5e74\u8f7b\u4ee3\u4e09\u5757\u533a\u57df\u7684\u53d8\u5316,\u5c24\u5176\u662fSurvivor\u533a\u57df,\u4e0b\u56fe\u662f\u5f53\u65f6\u4e00\u4e2a\u60c5\u51b5,S\u533a\u5927\u5c0f\u4e00\u76f4\u5728\u53d8\u5316,\u800c\u4e14\u57fa\u672c\u4e00\u81f4\u4fdd\u6301\u572850%\u4ee5\u4e0a,\u8fd9\u65f6\u5019\u60f3\u5230\u4e86\u4e00\u4e2aJVM\u9ad8\u7248\u672c\u7279\u6027,\u4f1a\u81ea\u52a8\u6253\u5f00UseAdaptiveSizePolicy(\u52a8\u6001\u8c03\u6574),\u67e5\u8d44\u6599\u540e\u53d1\u73b0,\u597d\u591a\u4eba\u53cd\u5e94\u8fd9\u4e2a\u53c2\u6570\u4f1a\u5bfc\u81f4\u5bf9\u8c61\u8de8\u8fc7S\u533a,\u76f4\u63a5\u8dd1\u5230\u8001\u5e74\u4ee3\u7684\u60c5\u51b5,\u6211\u4eec\u770b\u5230\u5728\u8c03\u7528\u91cf\u6301\u7eed\u5f88\u9ad8\u7684\u60c5\u51b5,\u5c3d\u7136\u8c03\u6574\u5230\u4e8617M,\u8fd9\u80af\u5b9a\u4f1a\u5bfc\u81f4\u5bb9\u7eb3\u4e0d\u4e0b\u5f53\u65f6\u5b58\u6d3b\u7684\u5bf9\u8c61<\/p>\n<blockquote><p>UseAdaptiveSizePolicy\u5f00\u5173\u53c2\u6570-XX:+UseAdaptiveSizePolicy\u662f\u4e00\u4e2a\u5f00\u5173\u53c2\u6570\uff0c\u5f53\u8fd9\u4e2a\u53c2\u6570\u6253\u5f00\u4e4b\u540e\uff0c\u865a\u62df\u673a\u4f1a\u6839\u636e\u5f53\u524d\u7cfb\u7edf\u7684\u8fd0\u884c\u60c5\u51b5\u6536\u96c6\u6027\u80fd\u76d1\u63a7\u4fe1\u606f\uff0c\u52a8\u6001\u8c03\u6574\u8fd9\u4e9b\u53c2\u6570\u4ee5\u63d0\u4f9b\u6700\u5408\u9002\u7684\u505c\u987f\u65f6\u95f4\u6216\u6700\u5927\u7684\u541e\u5410\u91cf\uff0c\u8fd9\u79cd\u8c03\u8282\u65b9\u5f0f\u79f0\u4e3aGC\u81ea\u9002\u5e94\u7684\u8c03\u8282\u7b56\u7565\uff08GC Ergonomics\uff09\u3002<\/p><\/blockquote>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141611\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<h4>\u5b9a\u4f4d\u5230UseAdaptiveSizePolicy\u95ee\u9898<\/h4>\n<p>\u65e2\u7136\u8fd9\u6709\u95ee\u9898,\u6211\u4eec\u5c1d\u8bd5\u5173\u95ed\u4e00\u4e0b\u8fd9\u4e2a\u53c2\u6570\u770b\u4e0b\u6548\u679c,\u4e0b\u9762\u662f\u8001\u5e74\u4ee3,S\u533a\u548cFullGC,\u5728\u5173\u95ed\u524d\u548c\u5173\u95ed\u540e\u7684\u6548\u679c,\u5173\u95ed\u4e4b\u540eS\u533a\u5927\u591a\u6570\u65f6\u95f4\u6709\u5145\u8db3\u7684\u7a7a\u95f4,\u800c\u4e14,\u8001\u5e74\u4ee3\u548cFullGC\u56fe\u4e5f\u5b89\u7a33\u4e86\u5f88\u591a \u5173\u95edAdaptiveSizePolicy\u7684\u65b9\u5f0f<\/p>\n<pre><code>\u5f00\u542f\uff1a-XX:+UseAdaptiveSizePolicy(JDK1.8 Parallel Scavenge\u6536\u96c6\u5668\u9ed8\u8ba4)\n\u5173\u95ed\uff1a-XX:-UseAdaptiveSizePolicy\n\n<\/code><\/pre>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141613\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141614\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141615\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<h4>\u53d1\u73b0\u65b0\u7684\u95ee\u9898<\/h4>\n<p>\u4e0a\u56fe\u4e2d\u867d\u7136\u5df2\u7ecf\u5b89\u7a33\u4e86\u5f88\u591a,\u4f46\u662f\u8fd8\u662f\u6709\u4e00\u70b9\u5c0f\u95ee\u9898,\u9891\u7e41FullGC\u867d\u7136\u6ca1\u6709\u4e86,\u4f46\u662f\u4e00\u4e2a\u5c0f\u65f6\u8fd8\u662f\u4f1a\u51fa\u73b0\u4e00\u6b21FullGC,\u800c\u4e14\u8fd9\u65f6\u5019\u8001\u5e74\u4ee3\u8fd8\u6ca1\u6709\u6ee1,\u8fd9\u79cd\u9891\u7387\u7684FullGC,\u7406\u8bba\u4e0a\u4e5f\u662f\u4e0d\u5141\u8bb8\u7684. \u6211\u4eec\u56de\u5230\u7b2c\u4e00\u4e2a\u95ee\u9898,FullGC\u89e6\u53d1\u6761\u4ef6,\u7b2c\u4e09\u4e2a,\u6211\u4eec\u8d76\u7d27\u770b\u4e86\u4e0b\u6c38\u4e45\u4ee3,\u4e5f\u5c31\u662f\u5143\u7a7a\u95f4,\u5982\u4e0b\u56fe,\u8fd9\u4e00\u770b\u4e0d\u5f97\u4e86,\u5143\u7a7a\u95f4\u4e5f\u5728\u9891\u7e41\u53d8\u52a8,\u800c\u4e14\u8fbe\u5230300M\u5de6\u53f3\u65f6\u4f1a\u89e6\u53d1\u4e00\u6b21FullGC\u91ca\u653e\u6389.<\/p>\n<blockquote><p>tips: \u8fd9\u91cc\u662f\u6ca1\u6709\u914d\u7f6e\u5143\u7a7a\u95f4\u7684\u5927\u5c0f\u7684,\u4e5f\u6ca1\u6709\u914d\u7f6e\u5143\u7a7a\u95f4\u7684\u7406\u8bba\u4e0a\u5143\u7a7a\u95f4\u65e0\u9650\u5927,\u4e0d\u4f1a\u6ee1,\u67e5\u8be2\u8d44\u6599\u540e\u89e3\u91ca\u662f,\u5143\u7a7a\u95f4\u4e5f\u4f1a\u6839\u636e\u5f53\u524d\u5df2\u4f7f\u7528\u8fdb\u884c\u52a8\u6001\u8c03\u6574,\u5f53\u8fbe\u5230\u4e0a\u6b21\u8c03\u6574\u503c90%\u540e\u5c31\u4f1aFullGC,\u6240\u4ee5\u6bcf\u6b21FullGC\u5143\u7a7a\u95f4\u5927\u5c0f\u5728200M\u5230500M\u4e0d\u7b49<\/p><\/blockquote>\n<h4>\u5143\u7a7a\u95f4\u5185\u5b58\u6392\u67e5<\/h4>\n<p>\u8fd9\u65f6\u731c\u6d4b\u53ef\u80fd\u662f\u4ee3\u7801\u4e2d\u51fa\u73b0\u4e86\u5927\u91cf\u7684\u52a8\u6001\u7c7b\u7684\u58f0\u660e,\u60f3\u8981\u5b9a\u4f4d\u54ea\u4e9b\u7c7b\u9700\u8981jvm\u542f\u52a8\u53c2\u6570\u52a0\u4e0a\u6253\u5370\u7c7b\u52a0\u8f7d\u548c\u5378\u8f7d\u7684\u53c2\u6570,\u987a\u5e26\u628aGC\u65e5\u5fd7\u5f00\u5173\u4e5f\u6253\u5f00<\/p>\n<pre><code>-XX:+TraceClassUnloading -XX:+TraceClassLoading -XX:+PrintGCDetails\n\n<\/code><\/pre>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141616\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p>\u6253\u5f00\u540e\u67e5\u770b\u65e5\u5fd7\u53d1\u73b0\u4e00\u4e2a\u9891\u7e41\u52a0\u8f7d\u548c\u5378\u8f7d\u7684\u7c7b[com.googlecode.aviator.Expression], \u7ecf\u67e5\u8be2\u8d44\u6599,\u8fd9\u4e2a\u662faviator \u5de5\u5177\u7684\u4e00\u4e2a\u89c4\u5219\u5f15\u64ce\u7c7b,\u5728\u52a0\u8f7d\u89c4\u5219\u65f6\u4f1a\u52a8\u6001\u52a0\u8f7d\u4e00\u4e2a\u7c7b,\u9ed8\u8ba4\u4e0d\u4f7f\u7528\u7f13\u5b58,\u53ef\u4ee5\u6253\u5f00\u7f13\u5b58\u9632\u6b62\u9891\u7e41\u58f0\u660e\u65b0\u7c7b<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141617\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141618\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141619\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p>\u4fee\u6539\u4ee3\u7801\u540e\u91cd\u65b0\u90e8\u7f72,\u4e00\u5c0f\u65f6\u4e00\u6b21\u7684FullGC\u4e5f\u6ca1\u4e86,\u5982\u4e0b\u56fe<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141620\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u53d1\u73b0\u7684\u95ee\u9898: \u95ee\u9898\u4e00: AdaptiveSizePolicy\u5bfc\u81f4\u5bf9\u8c61\u63d0\u524d\u8fdb\u5165\u8001\u5e74\u4ee3,\u8001\u5e74\u4ee3\u589e\u957f\u901f\u5ea6\u5feb,\u5bfc\u81f4\u9891\u7e41FullGC \u89e3\u51b3\u65b9\u5f0f: \u5173\u95ed\uff1a-XX:-UseAdaptiveSizePolicy<\/p>\n<p>\u95ee\u9898\u4e8c: \u5143\u7a7a\u95f4\u4e0d\u65ad\u589e\u957f,\u5bfc\u81f4\u4e00\u5c0f\u65f6\u4e00\u6b21FullGC \u89e3\u51b3\u65b9\u5f0f: \u4fee\u6539\u903b\u8f91\u4ee3\u7801\u9632\u6b62\u9891\u7e41\u52a0\u8f7d\u65b0\u7c7b<\/p>\n<p>\u5728\u6392\u67e5\u95ee\u9898\u65f6\u5c3d\u53ef\u80fd\u5148\u627e\u76f4\u63a5\u539f\u56e0,\u7f29\u5c0f\u6392\u67e5\u8de8\u5ea6,\u4e0d\u8981\u4e00\u6b65\u5c31\u60f3\u77e5\u9053\u6839\u672c\u539f\u56e0,\u6bcf\u4e2a\u7ebf\u7d22\u90fd\u8981\u95ee\u4e2a\u4e3a\u4ec0\u4e48,\u4e0d\u6b63\u5e38\u7684\u73b0\u8c61\u80af\u5b9a\u662f\u6709\u539f\u56e0\u7684.<\/p>\n<p>\u4e0b\u9762\u662fFullGC\u6392\u67e5\u601d\u8def\u53c2\u8003\u8111\u56fe<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044141621\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<blockquote>\n<p>\u4f5c\u8005\uff1a\u4eac\u4e1c\u4fdd\u9669 \u9648\u6797\u8f89<\/p>\n<p>\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a \u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u6e90<\/p>\n<\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044141601\">https:\/\/segmentfault.com\/a\/1190000044141601<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8d77\u521d\u6ca1\u6709\u4eba\u5728\u610f\u8fd9\u573aGC,\u76f4\u5230\u5b83\u5f71\u54cd\u5230\u4e86\u6bcf\u4e00\u5929! \u524d\u8a00 \u672c\u6587\u8bb0\u5f55\u4e86\u4e00\u6b21\u6392\u67e5FullGC\u5bfc\u81f4\u7684TP99\u8fc7\u9ad8\u8fc7\u7a0b,\u4ecb 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