{"id":943,"date":"2020-08-23T17:42:59","date_gmt":"2020-08-23T09:42:59","guid":{"rendered":"http:\/\/123.57.164.21\/?p=943"},"modified":"2020-08-23T17:42:59","modified_gmt":"2020-08-23T09:42:59","slug":"linux%e4%b8%ad%e7%9a%84-buff-cache%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=943","title":{"rendered":"Linux\u4e2d\u7684 buff\/cache\u5185\u5b58"},"content":{"rendered":"\n<p>\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u7528<span class=\"has-inline-color has-vivid-red-color\">free -m<\/span>\u547d\u4ee4\u6765\u67e5\u770b\u7cfb\u7edf\u5185\u5b58\u7684\u4f7f\u7528\u72b6\u6001\u3002\u5728\u4e00\u4e2acentos\u7684\u7cfb\u7edf\u4e0a\uff0cfree\u547d\u4ee4\u7684\u663e\u793a\u5185\u5bb9\u5927\u6982\u662f\u8fd9\u6837\u4e00\u4e2a\u72b6\u6001\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"110\" src=\"http:\/\/123.57.164.21\/wp-content\/uploads\/2020\/08\/image-118-1024x110.png\" alt=\"\" class=\"wp-image-944\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118-1024x110.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118-300x32.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118-768x83.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118-830x89.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118-230x25.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118-350x38.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118-480x52.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-118.png 1134w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p><strong>buffer<\/strong><\/p>\n\n\n\n<p>\u5373\u5199\u5165\u78c1\u76d8\u65f6\uff0c\u5148\u4fdd\u5b58\u5230\u78c1\u76d8\u7f13\u51b2\u533a(buffer)\uff0c\u7136\u540e\u518d\u5199\u5165\u5230\u78c1\u76d8\u3002<\/p>\n\n\n\n<p><strong>cache<\/strong><\/p>\n\n\n\n<p>\u5373\u8bfb\u78c1\u76d8\u65f6\uff0c\u6570\u636e\u4ece\u78c1\u76d8\u8bfb\u51fa\u540e\uff0c\u6682\u7559\u5728\u7f13\u51b2\u533a(cache)\uff0c\u4e3a\u540e\u7eed\u7a0b\u5e8f\u7684\u4f7f\u7528\u505a\u51c6\u5907\u3002<\/p>\n\n\n\n<p><strong>Linux\u8fd9\u79cd\u673a\u5236\u7684\u597d\u5904<\/strong><\/p>\n\n\n\n<p>\u8fd9\u662fLinux\u4e00\u79cd\u975e\u5e38\u4f18\u79c0\u7684\u8bbe\u8ba1\uff0c\u76ee\u7684\u5c31\u662f<strong>\u4e3a\u4e86\u63d0\u5347\u78c1\u76d8IO\u7684\u6027\u80fd<\/strong>\uff0c\u4ece\u4f4e\u901f\u7684\u5757\u8bbe\u5907\u4e0a\u8bfb\u53d6\u7684\u6570\u636e\u4f1a\u6682\u65f6\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u5373\u4f7f\u6570\u636e\u5728\u5f53\u65f6\u5df2\u7ecf\u4e0d\u518d\u9700\u8981\u4e86\uff0c\u4f46\u5728\u5e94\u7528\u7a0b\u5e8f\u4e0b\u4e00\u6b21\u8bbf\u95ee\u8be5\u6570\u636e\u65f6\uff0c\u5b83\u53ef\u4ee5\u4ece\u5185\u5b58\u4e2d\u76f4\u63a5\u8bfb\u53d6\uff0c\u7ed5\u5f00\u4e86\u4f4e\u901f\u7684\u5757\u8bbe\u5907\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u63d0\u9ad8\u7cfb\u7edf\u6027\u80fd\u548c\u4e0d\u6d6a\u8d39\u5185\u5b58\uff0clinux\u628a\u591a\u7684\u5185\u5b58\u505a\u4e86cache\uff0c\u4ee5\u63d0\u9ad8IO\u901f\u5ea6.\u4f60\u7684\u90a3\u4e9b\u5185\u5b58\u5e76\u6ca1\u6709\u88ab\u5360\u7528\u3002<\/p>\n\n\n\n<p>Linux\u5185\u6838\u4f1a\u5728\u5185\u5b58\u5c06\u8981\u8017\u5c3d\u7684\u65f6\u5019\uff0c\u89e6\u53d1\u5185\u5b58\u56de\u6536\u7684\u5de5\u4f5c\uff0c\u4ee5\u4fbf\u91ca\u653e\u51fa\u5185\u5b58\u7ed9\u6025\u9700\u5185\u5b58\u7684\u8fdb\u7a0b\u4f7f\u7528\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e2a\u64cd\u4f5c\u4e2d\u4e3b\u8981\u7684\u5185\u5b58\u91ca\u653e\u90fd\u6765\u81ea\u4e8e\u5bf9buffer\uff0fcache\u7684\u91ca\u653e\u3002\u5c24\u5176\u662f\u88ab\u4f7f\u7528\u66f4\u591a\u7684cache\u7a7a\u95f4\u3002\u65e2\u7136\u5b83\u4e3b\u8981\u7528\u6765\u505a\u7f13\u5b58\uff0c\u53ea\u662f\u5728\u5185\u5b58\u591f\u7528\u7684\u65f6\u5019\u52a0\u5feb\u8fdb\u7a0b\u5bf9\u6587\u4ef6\u7684\u8bfb\u5199\u901f\u5ea6\uff0c\u90a3\u4e48\u5728\u5185\u5b58\u538b\u529b\u8f83\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53\u7136\u6709\u5fc5\u8981\u6e05\u7a7a\u91ca\u653ecache\uff0c\u4f5c\u4e3afree\u7a7a\u95f4\u5206\u7ed9\u76f8\u5173\u8fdb\u7a0b\u4f7f\u7528\u3002\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8ba4\u4e3abuffer\/cache\u7a7a\u95f4\u53ef\u4ee5\u88ab\u91ca\u653e\uff0c\u8fd9\u4e2a\u7406\u89e3\u662f\u6b63\u786e\u7684\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u8fd9\u79cd\u6e05\u7f13\u5b58\u7684\u5de5\u4f5c\u4e5f\u5e76\u4e0d\u662f\u6ca1\u6709\u6210\u672c\u3002\u7406\u89e3cache\u662f\u5e72\u4ec0\u4e48\u7684\u5c31\u53ef\u4ee5\u660e\u767d\u6e05\u7f13\u5b58\u5fc5\u987b\u4fdd\u8bc1cache\u4e2d\u7684\u6570\u636e\u8ddf\u5bf9\u5e94\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u4e00\u81f4\uff0c\u624d\u80fd\u5bf9cache\u8fdb\u884c\u91ca\u653e\u3002<strong>\u6240\u4ee5\u4f34\u968f\u7740cache\u6e05\u9664\u7684\u884c\u4e3a\u7684\uff0c\u4e00\u822c\u90fd\u662f\u7cfb\u7edfIO\u98d9\u9ad8\u3002<\/strong>\u56e0\u4e3a\u5185\u6838\u8981\u5bf9\u6bd4cache\u4e2d\u7684\u6570\u636e\u548c\u5bf9\u5e94\u786c\u76d8\u6587\u4ef6\u4e0a\u7684\u6570\u636e\u662f\u5426\u4e00\u81f4\uff0c\u5982\u679c\u4e0d\u4e00\u81f4\u9700\u8981\u5199\u56de\uff0c\u4e4b\u540e\u624d\u80fd\u56de\u6536\u3002<\/p>\n\n\n\n<p>\u5728\u7cfb\u7edf\u4e2d\u9664\u4e86\u5185\u5b58\u5c06\u88ab\u8017\u5c3d\u7684\u65f6\u5019\u53ef\u4ee5\u6e05\u7f13\u5b58\u4ee5\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u8fd9\u4e2a\u6587\u4ef6\u6765\u4eba\u5de5\u89e6\u53d1\u7f13\u5b58\u6e05\u9664\u7684\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">[root@tencent64 ~]# cat \/proc\/sys\/vm\/drop_caches \n1\n\u65b9\u6cd5\u662f\uff1a\n\necho 1 > \/proc\/sys\/vm\/drop_caches\n\u5f53\u7136\uff0c\u8fd9\u4e2a\u6587\u4ef6\u53ef\u4ee5\u8bbe\u7f6e\u7684\u503c\u5206\u522b\u4e3a1\u30012\u30013\u3002\u5b83\u4eec\u6240\u8868\u793a\u7684\u542b\u4e49\u4e3a\uff1a\n\necho 1 > \/proc\/sys\/vm\/drop_caches:\u8868\u793a\u6e05\u9664pagecache\u3002\necho 2 > \/proc\/sys\/vm\/drop_caches:\u8868\u793a\u6e05\u9664\u56de\u6536slab\u5206\u914d\u5668\u4e2d\u7684\u5bf9\u8c61\uff08\u5305\u62ec\u76ee\u5f55\u9879\u7f13\u5b58\u548cinode\u7f13\u5b58\uff09\u3002slab\u5206\u914d\u5668\u662f\u5185\u6838\u4e2d\u7ba1\u7406\u5185\u5b58\u7684\u4e00\u79cd\u673a\u5236\uff0c\u5176\u4e2d\u5f88\u591a\u7f13\u5b58\u6570\u636e\u5b9e\u73b0\u90fd\u662f\u7528\u7684pagecache\u3002\necho 3 > \/proc\/sys\/vm\/drop_caches:\u8868\u793a\u6e05\u9664pagecache\u548cslab\u5206\u914d\u5668\u4e2d\u7684\u7f13\u5b58\u5bf9\u8c61\u3002<\/pre>\n\n\n\n<p>\u4f18\u5316\u540e\u622a\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"134\" src=\"http:\/\/123.57.164.21\/wp-content\/uploads\/2020\/08\/image-119-1024x134.png\" alt=\"\" class=\"wp-image-946\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119-1024x134.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119-300x39.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119-768x100.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119-830x108.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119-230x30.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119-350x46.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119-480x63.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2020\/08\/image-119.png 1150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u7528free -m\u547d\u4ee4\u6765\u67e5\u770b\u7cfb\u7edf\u5185\u5b58\u7684\u4f7f\u7528\u72b6\u6001\u3002\u5728\u4e00\u4e2acentos\u7684\u7cfb\u7edf\u4e0a\uff0cfree [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/943"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=943"}],"version-history":[{"count":2,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/943\/revisions"}],"predecessor-version":[{"id":947,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/943\/revisions\/947"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=943"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=943"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=943"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}