{"id":426,"date":"2018-05-05T09:12:35","date_gmt":"2018-05-05T01:12:35","guid":{"rendered":"http:\/\/pony.hk\/?p=426"},"modified":"2018-05-05T19:12:53","modified_gmt":"2018-05-05T11:12:53","slug":"centos%e7%b3%bb%e7%bb%9fbuff-cache%e5%8d%a0%e7%94%a8%e8%bf%87%e5%a4%9a%e5%86%85%e5%ad%98%e5%af%bc%e8%87%b4java%e8%bf%9b%e7%a8%8b%e9%97%aa%e9%80%80","status":"publish","type":"post","link":"https:\/\/lnmp.ivan.xin\/?p=426","title":{"rendered":"centos\u7cfb\u7edfbuff\/cache\u5360\u7528\u8fc7\u591a\u5185\u5b58\u5bfc\u81f4java\u8fdb\u7a0b\u95ea\u9000"},"content":{"rendered":"

\u73b0\u8c61\uff1a<\/b>
\n\u6211\u7684\u7cfb\u7edf\u73af\u5883\u662fcentos + nginx + php + mysql + java\uff0c\u5df2\u7ecf\u6301\u7eed\u8fd0\u884c\u4e86450\u591a\u5929\u6ca1\u6709\u91cd\u542f\u8fc7\u3002\u52a0\u4e0a\u4ee5\u524d\u75281GB\u5185\u5b58\u7684\u4e91\u4e3b\u673a\uff0c\u51e0\u5e74\u6765\u90fd\u6709JAVA\u8fdb\u7a0b\u81ea\u52a8\u95ea\u9000\u7684\u8001\u6bdb\u75c5\u3002\u5f53\u65f6\u8003\u8651\u662f\u5185\u5b58\u4e0d\u8db3\uff0c\u6240\u4ee5\u5c31\u964d\u4f4enginx\uff0cphp\uff0cmysql\u7684\u5185\u5b58\u5360\u7528\u91cf\uff0c\u4f46\u662f\u6ca1\u7528\u6548\u679c\uff0c\u6240\u4ee5\u8ba4\u4e3a\u662f\u7269\u7406\u5185\u5b581GB\u786e\u5b9e\u592a\u5c0f\uff0c\u600e\u4e48\u8c03\u4f18\u90fd\u4e0d\u591f\u4f7f\u7528\u3002<\/p>\n

\u540e\u6765\u6362\u4e862GB\u5185\u5b58\u7684\u4e91\u4e3b\u673a\uff0c\u95ee\u9898\u4f9d\u7136\u5b58\u5728\uff0c\u6240\u4ee5\u6000\u7591\u662fjava\u4ee3\u7801\u6709\u95ee\u9898\uff0c\u9020\u6210\u4e86\u5185\u5b58\u6ea2\u51fa\u3002\u56e0\u4e3a\u4e0d\u662f\u5f88\u91cd\u8981\uff0c\u6240\u4ee5\u4e5f\u6ca1\u6709\u4e13\u95e8\u5bf9JAVA\u7a0b\u5e8f\u4ee3\u7801\u8fdb\u884c\u8c03\u8bd5\u3002<\/p>\n

\u76f4\u5230\u4eca\u5929\uff0c\u65e0\u610f\u95f4\u53d1\u73b0\u4e86\u539f\u56e0\uff1a
\ncentos\u4e2d\u5185\u5b58\u7684\u5206\u914d\u662fbuff\/cache + free + used=\u7269\u7406\u5185\u5b58\u5927\u5c0f\uff0c\u7cfb\u7edf\u5206\u914d\u7ed9\u4e34\u65f6\u6587\u4ef6\u7cfb\u7edf\u7684\u5927\u5c0f\u9ed8\u8ba4\u662f\u7528\u6389\u4e00\u534a\u7684\u7269\u7406\u5185\u5b58<\/span>\uff0c\u8fd9\u6837\u4f1a\u9020\u6210buff\/cache\u5f88\u5927\uff0c\u800cfree\u5f88\u5c0f\uff0c\u4ee5\u81f4\u4e0d\u591fjava\u5206\u914d\u5230\u8db3\u591f\u7684\u5185\u5b58\uff0cjava\u8fdb\u7a0b\u53c8\u4e0d\u80fd\u8ba9buff\/cache\u91ca\u653e\u51fa\u4e00\u4e9b\u7a7a\u95f4\uff0c\u6240\u4ee5\u5c31\u5d29\u6e83\u4e86\u3002<\/p>\n

\u5206\u6790\uff1a<\/b>
\n1\u3001\u7cfb\u7edf\u5df2\u7ecf\u8fd0\u884c\u4e86450\u591a\u5929\uff0c\u9664\u4e86java\u4e0d\u7a33\u5b9a\u5916\uff0c\u5176\u4ed6\u6ca1\u6709\u4efb\u4f55\u95ee\u9898\uff0cnginx\uff0cphp\u548cmysql\u8868\u73b0\u5f88\u597d\u3002
\n2\u3001\u542f\u52a8nginx\uff0cphp\uff0cmysql\uff0c\u518d\u542f\u52a8tomcat\uff0c\u8fd0\u884cjava\uff0c\u6ce8\u610f\u89c2\u5bdftop\u547d\u4ee4\u7684\u8f93\u51fa\u53d8\u5316\u3002\u73b0\u8c61\u662fjava\u6240\u5360\u5185\u5b58\u4f1a\u4e00\u76f4\u589e\u957f\uff0c\u4e00\u822c\u5230\u5360\u7528380MB\u65f6\uff0c\u8fdb\u7a0b\u5c31\u95ea\u9000\u4e86\u3002
\n\u770b\/var\/log\/messages\u65e5\u5fd7\uff0c\u6709\u63d0\u793aOut of memory: Kill process 13366 (java) score 183 or sacrifice child\u3002
\n\u4f46\u662f\u5206\u6790\u4e0b\uff0cmysql\u5360\u7528\u4e0d\u5230300MB\uff0cphp-fpm\u5360\u7528300MB\u5de6\u53f3\uff0c\u5c31\u7b97\u662fjava\u5360\u7528400MB\uff0c\u7269\u7406\u5185\u5b582GB\u4e5f\u8db3\u591f\u7528\u4e86\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u95ea\u9000\u5462\uff1f
\n\u7ee7\u7eed\u770btop\u547d\u4ee4\u7684\u8f93\u51fa\u53d8\u5316\uff0c\u6ca1\u542f\u52a8java\u65f6\uff0cfree\u662f300MB\u5de6\u53f3\uff0cjava\u8fd0\u884c\u540efree\u5c31\u8fc5\u901f\u51cf\u5c11\uff0c\u7136\u540ejava\u95ea\u9000\uff0cfree\u53d8\u5927\uff0c\u628aJAVA_OPTS\u5360\u7528\u5185\u5b58\u7684\u6570\u91cf\u8c03\u5230\u5f88\u5c0f\uff0c\u4e5f\u6ca1\u7528\uff0c\u770b\u6765\u65e0\u6cd5\u4e25\u683c\u63a7\u5236java\u5360\u7528\u5185\u5b58\u4e0d\u8d85\u8fc7\u4e00\u4e2a\u6570\u503c\u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48free\u4f1a\u8fd9\u4e48\u5c0f\u5462\uff1f\u7ee7\u7eed\u89c2\u5bdf\u548c\u5206\u6790\uff0c\u5f97\u5230\u4e3b\u8981\u539f\u56e0\u662fbuff\/cache\u5360\u7528\u4e861GB\u5de6\u53f3\u7684\u7a7a\u95f4\u3002
\n3\u3001\u53c2\u8003\u8d44\u6599https:\/\/blog.csdn.net\/u014740338\/article\/details\/66975550<\/a>\uff0c\u7528\u547d\u4ee4echo 3 > \/proc\/sys\/vm\/drop_caches\u91ca\u653ebuff\/cache\u7a7a\u95f4\uff0c\u6ca1\u6709\u4f5c\u7528\u3002
\n4\u3001\u7528\u547d\u4ee4free -h\u548ccat \/proc\/meminfo\u67e5\u770b\u7ed3\u679c\uff0c\u53d1\u73b0SUnreclaim\u5f88\u5927\uff0cSReclaimable\u5f88\u5c0f\uff0c\u51e0\u4e4e\u5168\u662f\u4e0d\u53ef\u56de\u6536\u7a7a\u95f4\uff0c\u6240\u4ee5\u4e0a\u8fb9\u7684\u547d\u4ee4echo 3 > \/proc\/sys\/vm\/drop_caches\u4e5f\u8d77\u4e0d\u5230\u4f5c\u7528\u3002\u53c8\u5c1d\u8bd5\u4e24\u4e2a\u547d\u4ee4less \/proc\/slabinfo \u548cslabtop\uff0c\u4f9d\u7136\u6ca1\u6709\u4f5c\u7528\u3002
\n5\u3001\u7ee7\u7eed\u67e5\u627e\u8d44\u6599https:\/\/www.v2ex.com\/t\/278921<\/a>\uff0c\u8ba4\u8bc6\u5230\u8fd9\u90e8\u5206\u7a7a\u95f4\u662f\u6ca1\u529e\u6cd5\u56de\u6536\u7684\uff0c\u53ea\u6709\u91cd\u65b0\u5b9a\u4e49tmpfs\u7684\u5927\u5c0f\uff0c\u91cd\u542f\u4e3b\u673a\u3002<\/p>\n

\u89e3\u51b3\uff1a<\/b>
\n1\u3001\u521b\u5efaswap\u6587\u4ef6\u5206\u533a\uff0c\u5360\u7528\u786c\u76d81GB\uff0c\u9650\u5b9atmpfs \/dev\/shm\u4e34\u65f6\u6587\u4ef6\u7cfb\u7edf\uff0c\u5360\u7528\u5185\u5b58\u5927\u5c0f\u4e3a512MB
\n# df -h
\n# dd if=\/dev\/zero of=\/root\/swapfile bs=1M count=1024
\n# mkswap \/root\/swapfile
\n# swapon \/root\/swapfile
\n# vi \/etc\/fstab \u6dfb\u52a0\u5982\u4e0b\u5185\u5bb9\uff1a
\ntmpfs \/dev\/shm tmpfs defaults,size=512M 0 0
\ntmpfs \/run tmpfs defaults,size=512M 0 0
\n\/root\/swapfile swap swap defaults 0 0<\/p>\n

# umount \/dev\/shm
\n# mount \/dev\/shm
\n# reboot<\/p>\n

2\u3001\u6574\u4f53\u5185\u5b58\u6027\u80fd\u8c03\u4f18\uff0c\u8be6\u89c1\uff1ahttp:\/\/pony.hk\/?p=422<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u73b0\u8c61\uff1a \u6211\u7684\u7cfb\u7edf\u73af\u5883\u662fcentos + nginx + php + mysql + java\uff0c\u5df2\u7ecf\u6301\u7eed\u8fd0\u884c\u4e864...<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22781],"tags":[],"class_list":["post-426","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=\/wp\/v2\/posts\/426","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=426"}],"version-history":[{"count":0,"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=\/wp\/v2\/posts\/426\/revisions"}],"wp:attachment":[{"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lnmp.ivan.xin\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}