{"id":145312,"date":"2019-06-08T09:13:15","date_gmt":"2019-06-08T01:13:15","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=145312"},"modified":"2019-05-27T09:14:03","modified_gmt":"2019-05-27T01:14:03","slug":"linux-ubuntu-down","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/linux-ubuntu-down.html","title":{"rendered":"linux\u91ca\u653e\u5185\u5b58\u811a\u672c\uff0c\u89e3\u51b3ubuntu\u8001\u662f\u6b7b\u673a\u7684\u95ee\u9898"},"content":{"rendered":"<table>\n<tbody>\n<tr>\n<td style=\"padding: 5px 12px; width: 25px; font-size: 22px; text-align: center; background: #E8E8E8; line-height: 30px; color: #999;\">\u5bfc\u8bfb<\/td>\n<td style=\"padding: 10px 10px 12px; line-height: 20px;\"><strong>ubuntu\u7684\u56fe\u5f62\u754c\u9762\u7528\u7684\u662fgnome\uff0c\u6211\u53d1\u73b0ubunut\u7528gnome\u8001\u662f\u6b7b\uff0c\u5982\u679c\u5de5\u4f5c\u516b\u4e2a\u5c0f\u65f6\uff0c\u8981\u6b7b\u4e8c\uff0c\u4e09\u6b21\u641e\u5f97\u6211\u5f88\u90c1\u95f7\u3002\u5bb6\u91cc\u7684centos\u7528\u7684\u4e5f\u662fgnome\uff0c\u5c31\u4e0d\u4f1a\u6b7b\uff0c\u5e76\u4e14\u5bb6\u91cc\u7535\u8111\u5185\u5b58\u8fd8\u5c0f\u3002<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>root@ubuntu:\/home\/zhangying# free -m\r\ntotal used free shared buffers cached\r\nMem: 3449 2123 1325 0 576 777\r\n-\/+ buffers\/cache: 769 2680\r\nSwap: 254 0 254<\/pre>\n<p>\u88abbuffers,cached\u7b49\u5360\u53bb\u7684\u5185\u5b58\uff0c\u91ca\u653e\u7684\u5f88\u6162\uff0c\u5bfc\u81f4\u53ef\u7528\u5185\u5b58\u4e0d\u591f\u7528\u3002\u516c\u53f8\u7535\u8111\u7684\u5185\u5b58\u53ef\u662f3.5G\u554a\uff0c\u8fd9\u90fd\u4e0d\u591f\u5b83\u5360\u7684\uff0c\u771f\u662f\u65e0\u8bed\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5\uff1a<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>1\uff0cvim free.sh\u5efa\u4e2a\u811a\u672c<\/strong><\/div>\n<pre>free -m |grep -i mem |awk '{if($4 < 300){ printf(\"3\") > \"\/proc\/sys\/vm\/drop_caches\"}}'; <\/pre>\n<p>\u7b80\u5355\u89e3\u91ca\u4e00\u4e0b\uff0c\u67e5\u770b\u4e00\u4e0b\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u627e\u5230\u5185\u5b58\u6240\u5728\u884c\u3002\u5224\u65ad\u53ef\u7528\u5185\u5b58\u5927\u5c0f\uff0c\u5982\u679c\u5c0f\u4e8e300M\uff0c\u5c31\u91ca\u653e\u5185\u5b58\u3002drop_caches\u6587\u4ef6\u4e2d\u5c31\u4e00\u4e2a0\uff0c\u8fd9\u91cc\u4e3a\u4ec0\u4e48\u8981\u5199\u5165\u4e00\u4e2a3\u5462?\u5b98\u65b9\u89e3\u91ca\u5982\u4e0b\uff1a<\/p>\n<blockquote><p>To free pagecache, use echo 1 > \/proc\/sys\/vm\/drop_caches;<\/p>\n<p>to free dentries and inodes, use echo 2 > \/proc\/sys\/vm\/drop_caches;<\/p>\n<p>to free pagecache, dentries and inodes, use echo 3 >\/proc\/sys\/vm\/drop_caches.<\/p><\/blockquote>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>2\uff0c\u52a0\u5230crontab\u4e2d\u53bb<\/strong><\/div>\n<pre>\r\nsudo su\r\n\r\ncrontab -e\r\n*\/05 * * * * \/home\/zhangying\/free.sh <\/pre>\n<p>\u6ce8\u610f\uff1a<\/p>\n<p>1,crontab\u8981\u4ee5root\u7684\u6743\u9650\u53bb\u6267\u884c\uff0c\u666e\u901a\u7528\u6237\u662f\u6ca1\u6709drop_caches\u5199\u7684\u6743\u9650\u7684\u3002<\/p>\n<p>2,\u6839\u636e\u7cfb\u7edf\u7684\u4e0d\u540c\uff0c*\/05 * * * * <span style=\"padding: 4px 8px; font-size: 12px; border-radius: 3px; color: #c7254e; background-color: #f9f2f4;\">\/home\/zhangying\/free.sh<\/span>\uff0c\u6bcf\u96945\u5206\u949f\u6267\u884c\u4e00\u6b21\uff0c\u6709\u7684\u5199\u6cd5\u662f*\/5 * * * * <span style=\"padding: 4px 8px; font-size: 12px; border-radius: 3px; color: #c7254e; background-color: #f9f2f4;\">\/home\/zhangying\/free.sh<\/span>\uff0c\u8fd9\u79cd\u65b9\u5f0f\u5728ubuntu10.10\u4e0b\uff0c\u6211\u8bd5\u4e86\u4e0d\u884c\u3002<\/p>\n<p>\u52a0\u4e86\u8fd9\u4e2a\u811a\u672c\u540e\uff0c\u57fa\u672c\u4e0a\u6ca1\u6b7b\u8fc7\u4e86\u3002\u54c8\u54c8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>root@ubuntu:\/home\/zhangying# free -m total used free sh [&hellip;]<\/p>\n","protected":false},"author":63,"featured_media":146101,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-145312","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/145312","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/63"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=145312"}],"version-history":[{"count":5,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/145312\/revisions"}],"predecessor-version":[{"id":146429,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/145312\/revisions\/146429"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/146101"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=145312"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=145312"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=145312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}