{"id":344,"date":"2012-09-19T18:51:19","date_gmt":"2012-09-19T10:51:19","guid":{"rendered":"http:\/\/www.hzaumycology.com\/chenlianfu_blog\/?p=344"},"modified":"2012-09-19T22:36:32","modified_gmt":"2012-09-19T14:36:32","slug":"linux%e4%b8%8b%e5%a6%82%e4%bd%95%e9%87%8a%e6%94%be%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"http:\/\/www.chenlianfu.com\/?p=344","title":{"rendered":"Linux\u4e0b\u5982\u4f55\u91ca\u653e\u5185\u5b58"},"content":{"rendered":"<p>\u5728Linux\u7cfb\u7edf\u4e0b\uff0c\u6211\u4eec\u4e00\u822c\u4e0d\u9700\u8981\u53bb\u91ca\u653e\u5185\u5b58\uff0c\u56e0\u4e3a\u7cfb\u7edf\u5df2\u7ecf\u5c06\u5185\u5b58\u7ba1\u7406\u7684\u5f88\u597d\u3002\u4f46\u662f\u51e1\u4e8b\u4e5f\u6709\u4f8b\u5916\uff0c\u6709\u7684\u65f6\u5019\u5185\u5b58\u4f1a\u88ab\u7f13\u5b58\u5360\u7528\u6389\uff0c\u5bfc\u81f4\u7cfb\u7edf\u4f7f\u7528SWAP\u7a7a\u95f4\u5f71\u54cd\u6027\u80fd\uff0c\u6b64\u65f6\u5c31\u9700\u8981\u6267\u884c\u91ca\u653e\u5185\u5b58\uff08\u6e05\u7406\u7f13\u5b58\uff09\u7684\u64cd\u4f5c\u4e86\u3002<\/p>\n<p>Linux\u7cfb\u7edf\u7684\u7f13\u5b58\u673a\u5236\u662f\u76f8\u5f53\u5148\u8fdb\u7684\uff0c\u4ed6\u4f1a\u9488\u5bf9dentry\uff08\u7528\u4e8eVFS\uff0c\u52a0\u901f\u6587\u4ef6\u8def\u5f84\u540d\u5230inode\u7684\u8f6c\u6362\uff09\u3001Buffer Cache\uff08\u9488\u5bf9\u78c1\u76d8\u5757\u7684\u8bfb\u5199\uff09\u548cPage Cache\uff08\u9488\u5bf9\u6587\u4ef6inode\u7684\u8bfb\u5199\uff09\u8fdb\u884c\u7f13\u5b58\u64cd\u4f5c\u3002\u4f46\u662f\u5728\u8fdb\u884c\u4e86\u5927\u91cf\u6587\u4ef6\u64cd\u4f5c\u4e4b\u540e\uff0c\u7f13\u5b58\u4f1a\u628a\u5185\u5b58\u8d44\u6e90\u57fa\u672c\u7528\u5149\u3002\u4f46\u5b9e\u9645\u4e0a\u6211\u4eec\u6587\u4ef6\u64cd\u4f5c\u5df2\u7ecf\u5b8c\u6210\uff0c\u8fd9\u90e8\u5206\u7f13\u5b58\u5df2\u7ecf\u7528\u4e0d\u5230\u4e86\u3002\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u4eec\u96be\u9053\u53ea\u80fd\u773c\u7741\u7741\u7684\u770b\u7740\u7f13\u5b58\u628a\u5185\u5b58\u7a7a\u95f4\u5360\u636e\u6389\u4e48\uff1f<\/p>\n<p>\u6240\u4ee5\uff0c\u6211\u4eec\u8fd8\u662f\u6709\u5fc5\u8981\u6765\u624b\u52a8\u8fdb\u884cLinux\u4e0b\u91ca\u653e\u5185\u5b58\u7684\u64cd\u4f5c\uff0c\u5176\u5b9e\u4e5f\u5c31\u662f\u91ca\u653e\u7f13\u5b58\u7684\u64cd\u4f5c\u4e86\u3002<\/p>\n<p>\u8981\u8fbe\u5230\u91ca\u653e\u7f13\u5b58\u7684\u76ee\u7684\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u4e86\u89e3\u4e0b\u5173\u952e\u7684\u914d\u7f6e\u6587\u4ef6\/proc\/sys\/vm\/drop_caches\u3002\u8fd9\u4e2a\u6587\u4ef6\u4e2d\u8bb0\u5f55\u4e86\u7f13\u5b58\u91ca\u653e\u7684\u53c2\u6570\uff0c\u9ed8\u8ba4\u503c\u4e3a0\uff0c\u4e5f\u5c31\u662f\u4e0d\u91ca\u653e\u7f13\u5b58\u3002\u4ed6\u7684\u503c\u53ef\u4ee5\u4e3a0~3\u4e4b\u95f4\u7684\u4efb\u610f\u6570\u5b57\uff0c\u4ee3\u8868\u7740\u4e0d\u540c\u7684\u542b\u4e49\uff1a<\/p>\n<pre>0 \u2013 \u4e0d\u91ca\u653e\r\n1 \u2013 \u91ca\u653e\u9875\u7f13\u5b58\r\n2 \u2013 \u91ca\u653edentries\u548cinodes\r\n3 \u2013 \u91ca\u653e\u6240\u6709\u7f13\u5b58<\/pre>\n<p>\u77e5\u9053\u4e86\u53c2\u6570\u540e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u6839\u636e\u6211\u4eec\u7684\u9700\u8981\uff0c\u4f7f\u7528\u4e0b\u9762\u7684\u6307\u4ee4\u6765\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u9996\u5148\u6211\u4eec\u9700\u8981\u4f7f\u7528sync\u6307\u4ee4\uff0c\u5c06\u6240\u6709\u672a\u5199\u7684\u7cfb\u7edf\u7f13\u51b2\u533a\u5199\u5230\u78c1\u76d8\u4e2d\uff0c\u5305\u542b\u5df2\u4fee\u6539\u7684 i-node\u3001\u5df2\u5ef6\u8fdf\u7684\u5757 I\/O \u548c\u8bfb\u5199\u6620\u5c04\u6587\u4ef6\u3002\u5426\u5219\u5728\u91ca\u653e\u7f13\u5b58\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u4f1a\u4e22\u5931\u672a\u4fdd\u5b58\u7684\u6587\u4ef6\u3002<\/p>\n<pre># sync<\/pre>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u9700\u8981\u5c06\u9700\u8981\u7684\u53c2\u6570\u5199\u8fdb\/proc\/sys\/vm\/drop_caches\u6587\u4ef6\u4e2d\uff0c\u6bd4\u5982\u6211\u4eec\u9700\u8981\u91ca\u653e\u6240\u6709\u7f13\u5b58\uff0c\u5c31\u8f93\u5165\u4e0b\u9762\u7684\u547d\u4ee4\uff1a<\/p>\n<pre># echo 3 &gt; \/proc\/sys\/vm\/drop_caches<\/pre>\n<p>\u6b64\u6307\u4ee4\u8f93\u5165\u540e\u4f1a\u7acb\u5373\u751f\u6548\uff0c\u53ef\u4ee5\u67e5\u8be2\u73b0\u5728\u7684\u53ef\u7528\u5185\u5b58\u660e\u663e\u7684\u53d8\u591a\u4e86\u3002<\/p>\n<p>\u8981\u67e5\u8be2\u5f53\u524d\u7f13\u5b58\u91ca\u653e\u7684\u53c2\u6570\uff0c\u53ef\u4ee5\u8f93\u5165\u4e0b\u9762\u7684\u6307\u4ee4\uff1a<\/p>\n<pre># cat \/proc\/sys\/vm\/drop_caches<\/pre>\n<p>\u91ca\u653e\u7f13\u5b58\u5b8c\u6bd5\uff0c\u8ba9\u8bbe\u7f6e\u4fdd\u6301\u9ed8\u8ba4\uff1a<\/p>\n<pre># echo 0 &gt; \/proc\/sys\/vm\/drop_caches<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Linux\u7cfb\u7edf\u4e0b\uff0c\u6211\u4eec\u4e00\u822c\u4e0d\u9700\u8981\u53bb\u91ca\u653e\u5185\u5b58\uff0c\u56e0\u4e3a\u7cfb\u7edf\u5df2\u7ecf\u5c06\u5185\u5b58\u7ba1\u7406\u7684\u5f88\u597d\u3002\u4f46\u662f &hellip; <a href=\"http:\/\/www.chenlianfu.com\/?p=344\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[13,10],"_links":{"self":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts\/344"}],"collection":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=344"}],"version-history":[{"count":6,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts\/344\/revisions"}],"predecessor-version":[{"id":350,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts\/344\/revisions\/350"}],"wp:attachment":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=344"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=344"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}