{"id":508,"date":"2021-01-11T00:10:07","date_gmt":"2021-01-10T16:10:07","guid":{"rendered":"http:\/\/log.tanxiaodian.com\/?p=508"},"modified":"2021-01-11T00:10:07","modified_gmt":"2021-01-10T16:10:07","slug":"linux-free-%e5%91%bd%e4%bb%a4%e4%b8%8bfree-available%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/log.tanxiaodian.com\/?p=508","title":{"rendered":"linux free \u547d\u4ee4\u4e0bfree\/available\u533a\u522b"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.jianshu.com\/p\/2ffeb3a3aa90\">https:\/\/www.jianshu.com\/p\/2ffeb3a3aa90<\/a><\/p>\n\n\n\n<p>\u4f8b\u5b50<em><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;root@VM_16_17_centos bin]# free \n              total        used        free      shared  buff\/cache   available\nMem:        1882892      785272      280428       40496      817192      852060\nSwap:             0           0           0\n<\/code><\/pre>\n\n\n\n<p>\u5148\u8bf4\u660e\u4e00\u4e9b\u57fa\u672c\u6982\u5ff5<br><strong>\u7b2c\u4e00\u5217<\/strong><br><code>Mem<\/code> \u5185\u5b58\u7684\u4f7f\u7528\u4fe1\u606f<br><code>Swap<\/code> \u4ea4\u6362\u7a7a\u95f4\u7684\u4f7f\u7528\u4fe1\u606f<br><strong>\u7b2c\u4e00\u884c<\/strong><br><code>total<\/code> \u7cfb\u7edf\u603b\u7684\u53ef\u7528\u7269\u7406\u5185\u5b58\u5927\u5c0f<br><code>used<\/code> \u5df2\u88ab\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f<br><code>free<\/code> \u8fd8\u6709\u591a\u5c11\u7269\u7406\u5185\u5b58\u53ef\u7528<br><code>shared<\/code> \u88ab\u5171\u4eab\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f<br><code>buff\/cache<\/code> \u88ab buffer \u548c cache \u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f<br><code>available<\/code> \u8fd8\u53ef\u4ee5\u88ab <strong><em>\u5e94\u7528\u7a0b\u5e8f<\/em><\/strong> \u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f<\/p>\n\n\n\n<p>\u5176\u4e2d\u6709\u4e24\u4e2a\u6982\u5ff5\u9700\u8981\u6ce8\u610f<\/p>\n\n\n\n<h3>free \u4e0e available \u7684\u533a\u522b<\/h3>\n\n\n\n<p><code>free<\/code> \u662f\u771f\u6b63\u5c1a\u672a\u88ab\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u6570\u91cf\u3002<br><code>available<\/code> \u662f\u5e94\u7528\u7a0b\u5e8f\u8ba4\u4e3a\u53ef\u7528\u5185\u5b58\u6570\u91cf\uff0c<code>available = free + buffer + cache<\/code> (\u6ce8\uff1a\u53ea\u662f\u5927\u6982\u7684\u8ba1\u7b97\u65b9\u6cd5)<\/p>\n\n\n\n<p>Linux \u4e3a\u4e86\u63d0\u5347\u8bfb\u5199\u6027\u80fd\uff0c\u4f1a\u6d88\u8017\u4e00\u90e8\u5206\u5185\u5b58\u8d44\u6e90\u7f13\u5b58\u78c1\u76d8\u6570\u636e\uff0c\u5bf9\u4e8e\u5185\u6838\u6765\u8bf4\uff0cbuffer \u548c cache \u5176\u5b9e\u90fd\u5c5e\u4e8e\u5df2\u7ecf\u88ab\u4f7f\u7528\u7684\u5185\u5b58\u3002\u4f46\u5f53\u5e94\u7528\u7a0b\u5e8f\u7533\u8bf7\u5185\u5b58\u65f6\uff0c\u5982\u679c free \u5185\u5b58\u4e0d\u591f\uff0c\u5185\u6838\u5c31\u4f1a\u56de\u6536 buffer \u548c cache \u7684\u5185\u5b58\u6765\u6ee1\u8db3\u5e94\u7528\u7a0b\u5e8f\u7684\u8bf7\u6c42\u3002\u8fd9\u5c31\u662f\u7a0d\u540e\u8981\u8bf4\u660e\u7684 buffer \u548c cache\u3002<\/p>\n\n\n\n<h3>buff \u548c cache \u7684\u533a\u522b<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u4ee5\u4e0b\u5185\u5bb9\u6765\u81ea# <a href=\"https:\/\/www.cnblogs.com\/M18-BlankBox\/p\/5326484.html\" target=\"_blank\" rel=\"noreferrer noopener\">buffer\u548ccache\u600e\u4e48\u8ba9\u4f60\u4eec\u89e3\u91ca\u7684\u90a3\u4e48\u96be\u7406\u89e3\uff1f<\/a><\/p><\/blockquote>\n\n\n\n<p>\u4ece\u5b57\u9762\u4e0a\u548c\u8bed\u4e49\u6765\u770b\uff0cbuffer\u540d\u4e3a\u7f13\u51b2\uff0ccache\u540d\u4e3a\u7f13\u5b58\u3002\u6211\u4eec\u77e5\u9053\u5404\u79cd\u786c\u4ef6\u5b58\u5728\u5236\u4f5c\u5de5\u827a\u4e0a\u7684\u5dee\u522b\uff0c\u6240\u4ee5\u5f53\u4e24\u79cd\u786c\u4ef6\u9700\u8981\u4ea4\u4e92\u7684\u65f6\u5019\uff0c\u80af\u5b9a\u4f1a\u5b58\u5728\u901f\u5ea6\u4e0a\u7684\u5dee\u5f02\uff0c\u800c\u4e14\u53ea\u6709\u4ea4\u4e92\u53cc\u65b9\u90fd\u5b8c\u6210\u624d\u53ef\u4ee5\u5404\u81ea\u5904\u7406\u522b\u7684\u5176\u4ed6\u4e8b\u52a1\u3002\u5047\u5982\u73b0\u5728\u6709\u4e24\u4e2a\u9700\u8981\u4ea4\u4e92\u7684\u8bbe\u5907A\u548cB\uff0cA\u8bbe\u5907\u7528\u6765\u4ea4\u4e92\u7684\u63a5\u53e3\u901f\u7387\u4e3a1000M\/s\uff0cB\u8bbe\u5907\u7528\u6765\u4ea4\u4e92\u7684\u63a5\u53e3\u901f\u7387\u4e3a500M\/s\uff0c\u90a3\u4ed6\u4eec\u5f7c\u6b64\u8bbf\u95ee\u7684\u65f6\u5019\u90fd\u4f1a\u51fa\u73b0\u4ee5\u4e0b\u4e24\u79cd\u60c5\u51b5\uff1a\uff08\u4ee5A\u6765\u8bf4\uff09<\/p>\n\n\n\n<p>\u4e00.A\u4eceB\u53d6\u4e00\u4e2a1000M\u7684\u6587\u4ef6\u7ed3\u679c\u9700\u89812s\uff0c\u672c\u6765\u9700\u89811s\u5c31\u53ef\u4ee5\u5b8c\u6210\u7684\u5de5\u4f5c\uff0c\u5374\u8fd8\u9700\u8981\u989d\u5916\u7b49\u5f851s,B\u8bbe\u5907\u628a\u5269\u4f59\u7684500M\u627e\u51fa\u6765\uff0c\u8fd9\u7b49\u5f85B\u53d6\u51fa\u5269\u4e0b500M\u7684\u7a7a\u95f2\u65f6\u95f4\u5185(1s)\u5176\u4ed6\u7684\u4e8b\u52a1\u8fd8\u5e72\u4e0d\u4e86<\/p>\n\n\n\n<p>\u4e8c.A\u7ed9B\u4e00\u4e2a1000M\u7684\u6587\u4ef6\u7ed3\u679c\u4e5f\u9700\u89812s\uff0c\u672c\u6765\u9700\u8981\u4e5f\u5c311s\u5c31\u53ef\u4ee5\u5b8c\u6210\u7684\u5de5\u4f5c\uff0c\u5374\u7531\u4e8eB\uff0c1s\u5185\u53ea\u80fd\u62ff500M\uff0c\u5269\u4e0b\u7684500M\u8fd8\u5f97\u7b49\u4e0b\u4e00\u4e2a1sB\u6765\u53d6\uff0c\u8fd9\u7b49\u5f85\u4e0b1s\u7684\u65f6\u95f4\u8fd8\u505a\u4e0d\u4e86\u5176\u4ed6\u4e8b\u52a1\u3002<\/p>\n\n\n\n<p>\u90a3\u6709\u4ec0\u4e48\u65b9\u6cd5\u65e2\u53ef\u4ee5\u8ba9A\u5728\u2018\u53d6\u2019\u6216\u2018\u7ed9\u2019B\u7684\u65f6\u5019\u65e2\u80fd\u5b8c\u6210\u76ee\u6807\u4efb\u52a1\u53c8\u4e0d\u6d6a\u8d39\u90a31s\u7a7a\u95f2\u7b49\u5f85\u65f6\u95f4\u53bb\u5904\u7406\u5176\u4ed6\u4e8b\u52a1\u5462\uff1f\u6211\u4eec\u77e5\u9053\u4ea7\u751f\u8fd9\u79cd\u7ed3\u679c\u4e3b\u8981\u662f\u56e0\u4e3aB\u8ddf\u4e0d\u4e0aA\u7684\u8282\u594f\uff0c\u4f46\u5373\u4f7f\u8fd9\u6837A\u4e5f\u5f97\u5fc5\u987b\u7b49B\u5904\u7406\u5b8c\u672c\u6b21\u4e8b\u52a1\u624d\u80fd\u5e72\u5176\u4ed6\u6d3b\uff08\u5355\u6838cpu\u6765\u8bf4\uff09\uff0c\u9664\u975e\u4f60\u6709\u4e09\u5934\u516d\u81c2\u3002\u90a3\u6709\u5c0f\u4f19\u4f34\u53ef\u80fd\u4f1a\u95ee\u4e86\uff0c\u80fd\u4e0d\u80fd\u5728A\u548cB\u4e4b\u95f4\u52a0\u4e00\u5c42\u533a\u57df\u6bd4\u5982\u8bf4ab\uff0c\u8ba9ab\u65e2\u80fd\u8ddf\u4e0aA\u7684\u9891\u7387\u4e5f\u4f1a\u7167\u987eB\u7684\u611f\u53d7\uff0c\u6ca1\u9519\u6211\u4eec\u786e\u5b9e\u53ef\u4ee5\u8fd9\u6837\u8bbe\u8ba1\u6765\u78e8\u5408\u63a5\u53e3\u901f\u7387\u4e0a\u7684\u5dee\u5f02\uff0c\u4f60\u53ef\u4ee5\u8fd9\u6837\u60f3\u8c61\uff0c\u5728\u533a\u57dfab\u63d0\u4f9b\u4e86\u4e24\u4e2a\u4ea4\u4e92\u63a5\u53e3\u4e00\u4e2a\u662fa\u63a5\u53e3\u53e6\u4e00\u4e2a\u662fb\u63a5\u53e3\uff0ca\u63a5\u53e3\u7684\u901f\u7387\u63a5\u8fd1A\uff0cb\u63a5\u53e3\u7684\u901f\u7387\u6700\u5c11\u7b49\u4e8eB\uff0c\u7136\u540e\u6211\u4eec\u628aab\u7684a\u548cA\u76f8\u8fde\uff0cab\u7684b\u548cB\u76f8\u8fde\uff0cab\u5c31\u50cf\u4e00\u5ea7\u6865\u628aA\u548cB\u94fe\u63a5\u8d77\u6765\uff0c\u5e76\u544a\u77e5A\u548cB\u901a\u8fc7\u4ed6\u90fd\u80fd\u8f6c\u53d1\u7ed9\u5bf9\u65b9\uff0c\u6587\u4ef6\u53ef\u4ee5\u6682\u65f6\u5b58\u50a8\uff0c\u6700\u7ec8\u62d3\u6251\u5927\u6982\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img src=\"\/\/upload-images.jianshu.io\/upload_images\/14773634-c482af49f37c105b.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/649\/format\/webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u793a\u4f8b<\/p>\n\n\n\n<p>\u73b0\u5728\u6211\u4eec\u518d\u6765\u770b\u4e0a\u8ff0\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u7b2c\u4e00\u79cd\u60c5\u51b5A\u8981B\uff1a\u5f53A\u4eceB\u53d6\u4e00\u4e2a1000M\u7684\u6587\u4ef6\uff0c\u4ed6\u628a\u9700\u6c42\u544a\u8bc9\u4e86ab\uff0c\u63a5\u4e0b\u6765ab\u901a\u8fc7b\u548cB\u8fdb\u884c\u6587\u4ef6\u4f20\u9001\uff0c\u7531\u4e8eB\u672c\u8eab\u7684\u901f\u7387\uff0c\u4f20\u9001\u7b2c\u4e00\u6b21ab\u5e76\u6ca1\u6709\u4ec0\u4e48\u5375\u7528\uff0c\u5bf9A\u6765\u8bf4\u4e0d\u4ec5\u6d6a\u8d39\u4e86\u65f6\u95f4\u8fd8\u6d6a\u8d39\u4e86\u611f\u60c5\uff0cab\u8fd9\u5bb6\u4f19\u5f88\u5feb\u611f\u53d7\u5230\u4e86A\u7684\u4e0d\u6ee1\uff0c\u6240\u4ee5\u5728\u7b2c\u4e8c\u6b21\u4f20\u9001\u7684\u65f6\u5019\uff0cab\u80cc\u7740B\u5077\u5077\u7f13\u5b58\u4e86\u4e00\u4e2a\u4e00\u6a21\u4e00\u6837\u7684\u6587\u4ef6\uff0c\u800c\u4e14\u53ea\u8981\u4eceB\u53d6\u4e1c\u897f\uff0cab\u90fd\u4f1a\u7f13\u5b58\u4e00\u4e2a\u62f7\u8d1d\u4e0b\u6765\u653e\u5728\u81ea\u5df1\u7684\u5927\u672c\u8425\uff0c\u5982\u679c\u4e0b\u6b21A\u6216\u8005\u5176\u4ed6C\u6765\u53d6B\u7684\u4e1c\u897f\uff0cab\u76f4\u63a5\u5c31\u7ed9A\u6216C\u4e00\u4e2a\u8d27\u771f\u4ef7\u5b9e\u7684\u8d5d\u54c1\uff0c\u7136\u540e\u628a\u5b83\u901a\u8fc7a\u63a5\u53e3\u7ed9\u4e86A\u6216C\uff0c\u7531\u4e8ea\u7684\u901f\u7387\u76f8\u5bf9\u63a5\u8fd1A\u7684\u63a5\u53e3\u901f\u7387\uff0c\u6240\u4ee5A\u89c9\u5f97\u4e0d\u9519\u4e3a\u4ed6\u7701\u4e86\u65f6\u95f4\uff0c\u6700\u7ec8\u548cab\u7684a\u6210\u4e86\u597d\u57fa\u53cb\uff0c\u8bf4\u767d\u4e86\u6b64\u65f6\u7684ab\u63d0\u4f9b\u7684\u5c31\u662f\u4e00\u79cd\u7f13\u5b58\u80fd\u529b\uff0c\u5373cache\uff0c\u7edd\u5bf9\u7684\u8d70\u79c1\uff01\u56e0\u4e3aC\u53d6\u7684\u662fA\u6267\u884c\u7684\u7ed3\u679c\u3002\u6240\u4ee5\u5728\u8fd9\u79cd\u5de5\u4f5c\u6a21\u5f0f\u4e0b\uff0c\u600e\u4e48\u53d6\u5f97\u7684\u4e1c\u897f\u662f\u6700\u65b0\u7684\u4e5f\u662f\u6211\u4eec\u9700\u8981\u8003\u8651\u7684\uff0c\u4e00\u822c\u5c31\u662f\u6e05cache\u3002\u4f8b\u5982cpu\u8bfb\u53d6\u5185\u5b58\u6570\u636e\uff0c\u786c\u76d8\u4e00\u822c\u90fd\u63d0\u4f9b\u4e00\u4e2a\u5185\u5b58\u4f5c\u4e3a\u7f13\u5b58\u6765\u589e\u52a0\u7cfb\u7edf\u7684\u8bfb\u53d6\u6027\u80fd<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u7b2c\u4e8c\u79cd\u60c5\u51b5A\u7ed9B\uff1a\u5f53A\u53d1\u7ed9B\u4e00\u4e2a1000M\u7684\u6587\u4ef6\uff0c\u56e0\u4e3aA\u77e5\u9053\u901a\u8fc7ab\u7684a\u63a5\u53e3\u5c31\u53ef\u4ee5\u8f6c\u4ea4\u7ed9B\uff0c\u800c\u4e14\u901a\u8fc7a\u63a5\u53e3\u8981\u6bd4\u901a\u8fc7B\u63a5\u53e3\u4f20\u9001\u6587\u4ef6\u9700\u8981\u7b49\u5f85\u7684\u65f6\u95f4\u66f4\u77ed\uff0c\u6240\u4ee51000M\u901a\u8fc7a\u63a5\u53e3\u7ed9\u4e86ab 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class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/log.tanxiaodian.com\/?p=508\">Continue reading<span class=\"screen-reader-text\">linux free 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