{"id":51977,"date":"2024-12-03T08:36:53","date_gmt":"2024-12-03T00:36:53","guid":{"rendered":"https:\/\/fwq.ai\/blog\/51977\/"},"modified":"2024-12-03T08:36:53","modified_gmt":"2024-12-03T00:36:53","slug":"linux%e4%b8%adfree%e5%91%bd%e4%bb%a4%e6%80%8e%e4%b9%88%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/51977\/","title":{"rendered":"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528<\/h1>\n<p>\u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300alinux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u300b<\/span>\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n<\/p>\n<blockquote>\n<p>\u5728linux\u4e2d\uff0cfree\u662f\u67e5\u770b\u5185\u5b58\u4f7f\u7528\u72b6\u6001\u7684\u5185\u7f6e\u547d\u4ee4\uff0c\u53ef\u4ee5\u663e\u793a\u5305\u62ec\u7cfb\u7edf\u7269\u7406\u5185\u5b58\u3001\u865a\u62df\u5185\u5b58\uff08swap\u4ea4\u6362\u5206\u533a\uff09\u3001\u5171\u4eab\u5185\u5b58\u548c\u7cfb\u7edf\u7f13\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u8bed\u6cd5\u201cfree [\u9009\u9879]\u201d\uff1bfree\u547d\u4ee4\u7684\u8f93\u51fa\u548ctop\u547d\u4ee4\u7684\u5185\u5b58\u90e8\u5206\u975e\u5e38\u76f8\u4f3c\u3002<\/p>\n<\/blockquote>\n<h3><strong>Linux free\u547d\u4ee4\uff1a\u67e5\u770b\u5185\u5b58\u4f7f\u7528\u72b6\u6001<\/strong><\/h3>\n<p>free \u547d\u4ee4\u7528\u6765\u663e\u793a\u7cfb\u7edf\u5185\u5b58\u72b6\u6001\uff0c\u5305\u62ec\u7cfb\u7edf\u7269\u7406\u5185\u5b58\u3001\u865a\u62df\u5185\u5b58\uff08swap \u4ea4\u6362\u5206\u533a\uff09\u3001\u5171\u4eab\u5185\u5b58\u548c\u7cfb\u7edf\u7f13\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u5176\u8f93\u51fa\u548c top \u547d\u4ee4\u7684\u5185\u5b58\u90e8\u5206\u975e\u5e38\u76f8\u4f3c\u3002<\/p>\n<p>free \u547d\u4ee4\u7684\u57fa\u672c\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre>#&nbsp;free&nbsp;[\u9009\u9879]<\/pre>\n<p>\u8868 1 \u7f57\u5217\u51fa\u4e86\u6b64\u547d\u4ee4\u5e38\u7528\u7684\u9009\u9879\u53ca\u5404\u81ea\u7684\u542b\u4e49\u3002<\/p>\n<table>  \u8868 1 free \u547d\u4ee4\u5e38\u7528\u9009\u9879\u53ca\u542b\u4e49  <\/p>\n<tbody>\n<tr>\n<td>\u9009\u9879<\/td>\n<td>\u542b\u4e49<\/td>\n<\/tr>\n<tr>\n<td>-b<\/td>\n<td>\u4ee5 Byte\uff08\u5b57\u8282\uff09\u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002<\/td>\n<\/tr>\n<tr>\n<td>-k<\/td>\n<td>\u4ee5 KB \u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u6b64\u9009\u9879\u662f free \u547d\u4ee4\u7684\u9ed8\u8ba4\u9009\u9879\u3002<\/td>\n<\/tr>\n<tr>\n<td>-m<\/td>\n<td>\u4ee5 MB \u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002<\/td>\n<\/tr>\n<tr>\n<td>-g<\/td>\n<td>\u4ee5 GB \u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002<\/td>\n<\/tr>\n<tr>\n<td>-t<\/td>\n<td>\u5728\u8f93\u51fa\u7684\u6700\u7ec8\u7ed3\u679c\u4e2d\uff0c\u8f93\u51fa\u5185\u5b58\u548c swap \u5206\u533a\u7684\u603b\u91cf\u3002<\/td>\n<\/tr>\n<tr>\n<td>-o<\/td>\n<td>\u4e0d\u663e\u793a\u7cfb\u7edf\u7f13\u51b2\u533a\u8fd9\u4e00\u5217\u3002<\/td>\n<\/tr>\n<tr>\n<td>-s \u95f4\u9694\u79d2\u6570<\/td>\n<td>\u6839\u636e\u6307\u5b9a\u7684\u95f4\u9694\u65f6\u95f4\uff0c\u6301\u7eed\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>free \u547d\u4ee4\u53ef\u4ee5\u663e\u793a\u7cfb\u7edf\u4e2d\u5269\u4f59\u53ca\u5df2\u7528\u7684\u7269\u7406\u5185\u5b58\u548c\u4ea4\u6362\u5185\u5b58\uff0c\u4ee5\u53ca\u5171\u4eab\u5185\u5b58\u548c\u88ab\u6838\u5fc3\u4f7f\u7528\u7684\u7f13\u51b2\u533a\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240401\/1711943311660a2e8f671f8.jpg\" class=\"aligncenter\" title=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe\" alt=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe\" \/><\/p>\n<p>\u5982\u679c\u52a0\u4e0a -h \u9009\u9879\uff0c\u8f93\u51fa\u7684\u7ed3\u679c\u4f1a\u53cb\u597d\u5f88\u591a\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240401\/1711943311660a2e8f683cf.jpg\" class=\"aligncenter\" title=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe1\" alt=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe1\" \/><\/p>\n<p>\u6709\u65f6\u6211\u4eec\u9700\u8981\u6301\u7eed\u7684\u89c2\u5bdf\u5185\u5b58\u7684\u72b6\u51b5\uff0c\u6b64\u65f6\u53ef\u4ee5\u4f7f\u7528 -s \u9009\u9879\u5e76\u6307\u5b9a\u95f4\u9694\u7684\u79d2\u6570\uff1a<\/p>\n<pre>$ free -h -s 3\r\n<\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240401\/1711943311660a2e8f696df.jpg\" class=\"aligncenter\" title=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe2\" alt=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe2\" \/><\/p>\n<p>\u4e0a\u9762\u7684\u547d\u4ee4\u6bcf\u9694 3 \u79d2\u8f93\u51fa\u4e00\u6b21\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u76f4\u5230\u4f60\u6309\u4e0b ctrl + c\u3002<\/p>\n<p>\u7531\u4e8e free \u547d\u4ee4\u672c\u8eab\u6bd4\u8f83\u7b80\u5355\uff0c\u6240\u4ee5\u672c\u6587\u7684\u91cd\u70b9\u4f1a\u653e\u5728\u5982\u4f55\u901a\u8fc7 free \u547d\u4ee4\u4e86\u89e3\u7cfb\u7edf\u5f53\u524d\u7684\u5185\u5b58\u4f7f\u7528\u72b6\u51b5\u3002<\/p>\n<h3><strong>\u8f93\u51fa\u7b80\u4ecb<\/strong><\/h3>\n<p>\u4e0b\u9762\u5148\u89e3\u91ca\u4e00\u4e0b\u8f93\u51fa\u7684\u5185\u5bb9\uff1a<\/p>\n<ul>\n<li>\n<p><strong>Mem<\/strong> \u884c(\u7b2c\u4e8c\u884c)\u662f\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n<\/li>\n<li>\n<p><strong>Swap<\/strong> \u884c(\u7b2c\u4e09\u884c)\u662f\u4ea4\u6362\u7a7a\u95f4\u7684\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n<\/li>\n<li>\n<p><strong>total<\/strong> \u5217\u663e\u793a\u7cfb\u7edf\u603b\u7684\u53ef\u7528\u7269\u7406\u5185\u5b58\u548c\u4ea4\u6362\u7a7a\u95f4\u5927\u5c0f\u3002<\/p>\n<\/li>\n<li>\n<p><strong>used<\/strong> \u5217\u663e\u793a\u5df2\u7ecf\u88ab\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u548c\u4ea4\u6362\u7a7a\u95f4\u3002<\/p>\n<\/li>\n<li>\n<p><strong>free<\/strong> \u5217\u663e\u793a\u8fd8\u6709\u591a\u5c11\u7269\u7406\u5185\u5b58\u548c\u4ea4\u6362\u7a7a\u95f4\u53ef\u7528\u4f7f\u7528\u3002<\/p>\n<\/li>\n<li>\n<p><strong>shared<\/strong> \u5217\u663e\u793a\u88ab\u5171\u4eab\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f\u3002<\/p>\n<\/li>\n<li>\n<p><strong>buff\/cache<\/strong> \u5217\u663e\u793a\u88ab buffer \u548c cache \u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f\u3002<\/p>\n<\/li>\n<li>\n<p><strong>available<\/strong> \u5217\u663e\u793a\u8fd8\u53ef\u4ee5\u88ab\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u6211\u60f3\u53ea\u6709\u5728\u7406\u89e3\u4e86\u4e00\u4e9b\u57fa\u672c\u6982\u5ff5\u4e4b\u540e\uff0c\u4e0a\u9762\u7684\u8f93\u51fa\u624d\u80fd\u5e2e\u52a9\u6211\u4eec\u4e86\u89e3\u7cfb\u7edf\u7684\u5185\u5b58\u72b6\u51b5\u3002<\/p>\n<h3><strong>buff\/cache<\/strong><\/h3>\n<p>\u5148\u6765\u63d0\u4e00\u4e2a\u95ee\u9898\uff1a buffer \u548c cache \u5e94\u8be5\u662f\u4e24\u79cd\u7c7b\u578b\u7684\u5185\u5b58\uff0c\u4f46\u662f free \u547d\u4ee4\u4e3a\u4ec0\u4e48\u4f1a\u628a\u5b83\u4eec\u653e\u5728\u4e00\u8d77\u5462\uff1f\u8981\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\u9700\u8981\u6211\u4eec\u505a\u4e9b\u51c6\u5907\u5de5\u4f5c\u3002\u8ba9\u6211\u4eec\u5148\u6765\u641e\u6e05\u695a buffer \u4e0e cache \u7684\u542b\u4e49\u3002<\/p>\n<p><strong>buffer<\/strong> \u5728\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u6307 buffer cache\uff0c \u4e2d\u6587\u4e00\u822c\u7ffb\u8bd1\u4e3a &#8220;\u7f13\u51b2\u533a&#8221;\u3002\u8981\u7406\u89e3\u7f13\u51b2\u533a\uff0c\u5fc5\u987b\u660e\u786e\u53e6\u5916\u4e24\u4e2a\u6982\u5ff5\uff1a&#8221;\u6247\u533a&#8221; \u548c &#8220;\u5757&#8221;\u3002\u6247\u533a\u662f\u8bbe\u5907\u7684\u6700\u5c0f\u5bfb\u5740\u5355\u5143\uff0c\u4e5f\u53eb &#8220;\u786c\u6247\u533a&#8221; \u6216 &#8220;\u8bbe\u5907\u5757&#8221;\u3002\u5757\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u6587\u4ef6\u7cfb\u7edf\u7684\u6700\u5c0f\u5bfb\u5740\u5355\u5143\uff0c\u4e5f\u53eb &#8220;\u6587\u4ef6\u5757&#8221; \u6216 &#8220;I\/O \u5757&#8221;\u3002\u6bcf\u4e2a\u5757\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u6247\u533a\uff0c\u4f46\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc7\u4e00\u4e2a\u9875\u9762\uff0c\u6240\u4ee5\u4e00\u4e2a\u9875\u53ef\u4ee5\u5bb9\u7eb3\u4e00\u4e2a\u6216\u591a\u4e2a\u5185\u5b58\u4e2d\u7684\u5757\u3002\u5f53\u4e00\u4e2a\u5757\u88ab\u8c03\u5165\u5185\u5b58\u65f6\uff0c\u5b83\u8981\u5b58\u50a8\u5728\u4e00\u4e2a\u7f13\u51b2\u533a\u4e2d\u3002\u6bcf\u4e2a\u7f13\u51b2\u533a\u4e0e\u4e00\u4e2a\u5757\u5bf9\u5e94\uff0c\u5b83\u76f8\u5f53\u4e8e\u662f\u78c1\u76d8\u5757\u5728\u5185\u5b58\u4e2d\u7684\u8868\u793a(\u4e0b\u56fe\u6765\u81ea\u4e92\u8054\u7f51)\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240401\/1711943311660a2e8f6a96d.jpg\" class=\"aligncenter\" title=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe3\" alt=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe3\" \/><\/p>\n<p>\u6ce8\u610f\uff0cbuffer cache \u53ea\u6709\u5757\u7684\u6982\u5ff5\u800c\u6ca1\u6709\u6587\u4ef6\u7684\u6982\u5ff5\uff0c\u5b83\u53ea\u662f\u628a\u78c1\u76d8\u4e0a\u7684\u5757\u76f4\u63a5\u642c\u5230\u5185\u5b58\u4e2d\u800c\u4e0d\u5173\u5fc3\u5757\u4e2d\u7a76\u7adf\u5b58\u653e\u7684\u662f\u4ec0\u4e48\u683c\u5f0f\u7684\u6587\u4ef6\u3002<\/p>\n<p><strong>cache<\/strong> \u5728\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u6307 page cache\uff0c\u4e2d\u6587\u4e00\u822c\u7ffb\u8bd1\u4e3a &#8220;\u9875\u9ad8\u901f\u7f13\u5b58&#8221;\u3002\u9875\u9ad8\u901f\u7f13\u5b58\u662f\u5185\u6838\u5b9e\u73b0\u7684\u78c1\u76d8\u7f13\u5b58\u3002\u5b83\u4e3b\u8981\u7528\u6765\u51cf\u5c11\u5bf9\u78c1\u76d8\u7684 I\/O \u64cd\u4f5c\u3002\u5177\u4f53\u5730\u8bb2\uff0c\u662f\u901a\u8fc7\u628a\u78c1\u76d8\u4e2d\u7684\u6570\u636e\u7f13\u5b58\u5230\u7269\u7406\u5185\u5b58\u4e2d\uff0c\u628a\u5bf9\u78c1\u76d8\u7684\u8bbf\u95ee\u53d8\u4e3a\u5bf9\u7269\u7406\u5185\u5b58\u7684\u8bbf\u95ee\u3002\u9875\u9ad8\u901f\u7f13\u5b58\u7f13\u5b58\u7684\u662f\u5185\u5b58\u9875\u9762\u3002<strong>\u7f13\u5b58\u4e2d\u7684\u9875\u6765\u81ea\u5bf9\u666e\u901a\u6587\u4ef6\u3001\u5757\u8bbe\u5907\u6587\u4ef6(\u8fd9\u4e2a\u6307\u7684\u5c31\u662f buffer cache \u5440)\u548c\u5185\u5b58\u6620\u5c04\u6587\u4ef6\u7684\u8bfb\u5199<\/strong>\u3002<br \/>\u9875\u9ad8\u901f\u7f13\u5b58\u5bf9\u666e\u901a\u6587\u4ef6\u7684\u7f13\u5b58\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a\u5f53\u5185\u6838\u8981\u8bfb\u4e00\u4e2a\u6587\u4ef6(\u6bd4\u5982 \/etc\/hosts)\u65f6\uff0c\u5b83\u4f1a\u5148\u68c0\u67e5\u8fd9\u4e2a\u6587\u4ef6\u7684\u6570\u636e\u662f\u4e0d\u662f\u5df2\u7ecf\u5728\u9875\u9ad8\u901f\u7f13\u5b58\u4e2d\u4e86\u3002\u5982\u679c\u5728\uff0c\u5c31\u653e\u5f03\u8bbf\u95ee\u78c1\u76d8\uff0c\u76f4\u63a5\u4ece\u5185\u5b58\u4e2d\u8bfb\u53d6\u3002\u8fd9\u4e2a\u884c\u4e3a\u79f0\u4e3a\u7f13\u5b58\u547d\u4e2d\u3002\u5982\u679c\u6570\u636e\u4e0d\u5728\u7f13\u5b58\u4e2d\uff0c\u5c31\u662f\u672a\u547d\u4e2d\u7f13\u5b58\uff0c\u6b64\u65f6\u5185\u6838\u5c31\u8981\u8c03\u5ea6\u5757 I\/O \u64cd\u4f5c\u4ece\u78c1\u76d8\u53bb\u8bfb\u53d6\u6570\u636e\u3002\u7136\u540e\u5185\u6838\u5c06\u8bfb\u6765\u7684\u6570\u636e\u653e\u5165\u9875\u9ad8\u901f\u7f13\u5b58\u4e2d\u3002\u8fd9\u79cd\u7f13\u5b58\u7684\u76ee\u6807\u662f\u6587\u4ef6\u7cfb\u7edf\u53ef\u4ee5\u8bc6\u522b\u7684\u6587\u4ef6(\u6bd4\u5982 \/etc\/hosts)\u3002<br \/>\u9875\u9ad8\u901f\u7f13\u5b58\u5bf9\u5757\u8bbe\u5907\u6587\u4ef6\u7684\u7f13\u5b58\u5c31\u662f\u6211\u4eec\u5728\u524d\u9762\u4ecb\u7ecd\u7684 buffer cahce\u3002\u56e0\u4e3a\u72ec\u7acb\u7684\u78c1\u76d8\u5757\u901a\u8fc7\u7f13\u51b2\u533a\u4e5f\u88ab\u5b58\u5165\u4e86\u9875\u9ad8\u901f\u7f13\u5b58(\u7f13\u51b2\u533a\u6700\u7ec8\u662f\u7531\u9875\u9ad8\u901f\u7f13\u5b58\u6765\u627f\u8f7d\u7684)\u3002<\/p>\n<p>\u5230\u8fd9\u91cc\u6211\u4eec\u5e94\u8be5\u641e\u6e05\u695a\u4e86\uff1a\u65e0\u8bba\u662f\u7f13\u51b2\u533a\u8fd8\u662f\u9875\u9ad8\u901f\u7f13\u5b58\uff0c\u5b83\u4eec\u7684\u5b9e\u73b0\u65b9\u5f0f\u90fd\u662f\u4e00\u6837\u7684\u3002\u7f13\u51b2\u533a\u53ea\u4e0d\u8fc7\u662f\u4e00\u79cd\u6982\u5ff5\u4e0a\u6bd4\u8f83\u7279\u6b8a\u7684\u9875\u9ad8\u901f\u7f13\u5b58\u7f62\u4e86\u3002<br \/>\u90a3\u4e48\u4e3a\u4ec0\u4e48 free \u547d\u4ee4\u4e0d\u76f4\u63a5\u79f0\u4e3a cache \u800c\u975e\u8981\u5199\u6210 buff\/cache\uff1f \u8fd9\u662f\u56e0\u4e3a\u7f13\u51b2\u533a\u548c\u9875\u9ad8\u901f\u7f13\u5b58\u7684\u5b9e\u73b0\u5e76\u975e\u5929\u751f\u5c31\u662f\u7edf\u4e00\u7684\u3002\u5728 linux \u5185\u6838 2.4 \u4e2d\u624d\u5c06\u5b83\u4eec\u7edf\u4e00\u3002\u66f4\u65e9\u7684\u5185\u6838\u4e2d\u6709\u4e24\u4e2a\u72ec\u7acb\u7684\u78c1\u76d8\u7f13\u5b58\uff1a\u9875\u9ad8\u901f\u7f13\u5b58\u548c\u7f13\u51b2\u533a\u9ad8\u901f\u7f13\u5b58\u3002\u524d\u8005\u7f13\u5b58\u9875\u9762\uff0c\u540e\u8005\u7f13\u5b58\u7f13\u51b2\u533a\u3002\u5f53\u4f60\u77e5\u9053\u4e86\u8fd9\u4e9b\u6545\u4e8b\u4e4b\u540e\uff0c\u8f93\u51fa\u4e2d\u5217\u7684\u540d\u79f0\u53ef\u80fd\u5df2\u7ecf\u4e0d\u518d\u91cd\u8981\u4e86\u3002<\/p>\n<h3><strong>free \u4e0e available<\/strong><\/h3>\n<p>\u5728 free \u547d\u4ee4\u7684\u8f93\u51fa\u4e2d\uff0c\u6709\u4e00\u4e2a free \u5217\uff0c\u540c\u65f6\u8fd8\u6709\u4e00\u4e2a available \u5217\u3002\u8fd9\u4e8c\u8005\u5230\u5e95\u6709\u4f55\u533a\u522b\uff1f<br \/>free \u662f\u771f\u6b63\u5c1a\u672a\u88ab\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u6570\u91cf\u3002\u81f3\u4e8e available \u5c31\u6bd4\u8f83\u6709\u610f\u601d\u4e86\uff0c\u5b83\u662f\u4ece\u5e94\u7528\u7a0b\u5e8f\u7684\u89d2\u5ea6\u770b\u5230\u7684\u53ef\u7528\u5185\u5b58\u6570\u91cf\u3002Linux \u5185\u6838\u4e3a\u4e86\u63d0\u5347\u78c1\u76d8\u64cd\u4f5c\u7684\u6027\u80fd\uff0c\u4f1a\u6d88\u8017\u4e00\u90e8\u5206\u5185\u5b58\u53bb\u7f13\u5b58\u78c1\u76d8\u6570\u636e\uff0c\u5c31\u662f\u6211\u4eec\u4ecb\u7ecd\u7684 buffer \u548c cache\u3002\u6240\u4ee5\u5bf9\u4e8e\u5185\u6838\u6765\u8bf4\uff0cbuffer \u548c cache \u90fd\u5c5e\u4e8e\u5df2\u7ecf\u88ab\u4f7f\u7528\u7684\u5185\u5b58\u3002\u5f53\u5e94\u7528\u7a0b\u5e8f\u9700\u8981\u5185\u5b58\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u8db3\u591f\u7684 free \u5185\u5b58\u53ef\u4ee5\u7528\uff0c\u5185\u6838\u5c31\u4f1a\u4ece buffer \u548c cache \u4e2d\u56de\u6536\u5185\u5b58\u6765\u6ee1\u8db3\u5e94\u7528\u7a0b\u5e8f\u7684\u8bf7\u6c42\u3002\u6240\u4ee5\u4ece\u5e94\u7528\u7a0b\u5e8f\u7684\u89d2\u5ea6\u6765\u8bf4\uff0c<strong>available &nbsp;= free + buffer + cache<\/strong>\u3002\u8bf7\u6ce8\u610f\uff0c\u8fd9\u53ea\u662f\u4e00\u4e2a\u5f88\u7406\u60f3\u7684\u8ba1\u7b97\u65b9\u5f0f\uff0c\u5b9e\u9645\u4e2d\u7684\u6570\u636e\u5f80\u5f80\u6709\u8f83\u5927\u7684\u8bef\u5dee\u3002<\/p>\n<h3><strong>\u4ea4\u6362\u7a7a\u95f4(swap space)<\/strong><\/h3>\n<p>swap space \u662f\u78c1\u76d8\u4e0a\u7684\u4e00\u5757\u533a\u57df\uff0c\u53ef\u4ee5\u662f\u4e00\u4e2a\u5206\u533a\uff0c\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u6587\u4ef6\u3002\u6240\u4ee5\u5177\u4f53\u7684\u5b9e\u73b0\u53ef\u4ee5\u662f swap \u5206\u533a\u4e5f\u53ef\u4ee5\u662f swap \u6587\u4ef6\u3002\u5f53\u7cfb\u7edf\u7269\u7406\u5185\u5b58\u5403\u7d27\u65f6\uff0cLinux \u4f1a\u5c06\u5185\u5b58\u4e2d\u4e0d\u5e38\u8bbf\u95ee\u7684\u6570\u636e\u4fdd\u5b58\u5230 swap \u4e0a\uff0c\u8fd9\u6837\u7cfb\u7edf\u5c31\u6709\u66f4\u591a\u7684\u7269\u7406\u5185\u5b58\u4e3a\u5404\u4e2a\u8fdb\u7a0b\u670d\u52a1\uff0c\u800c\u5f53\u7cfb\u7edf\u9700\u8981\u8bbf\u95ee swap \u4e0a\u5b58\u50a8\u7684\u5185\u5bb9\u65f6\uff0c\u518d\u5c06 swap \u4e0a\u7684\u6570\u636e\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff0c\u8fd9\u5c31\u662f\u5e38\u8bf4\u7684\u6362\u51fa\u548c\u6362\u5165\u3002\u4ea4\u6362\u7a7a\u95f4\u53ef\u4ee5\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u7f13\u89e3\u5185\u5b58\u4e0d\u8db3\u7684\u60c5\u51b5\uff0c\u4f46\u662f\u5b83\u9700\u8981\u8bfb\u5199\u78c1\u76d8\u6570\u636e\uff0c\u6240\u4ee5\u6027\u80fd\u4e0d\u662f\u5f88\u9ad8\u3002<\/p>\n<p>\u73b0\u5728\u7684\u673a\u5668\u4e00\u822c\u90fd\u4e0d\u592a\u7f3a\u5185\u5b58\uff0c\u5982\u679c\u7cfb\u7edf\u9ed8\u8ba4\u8fd8\u662f\u4f7f\u7528\u4e86 swap \u662f\u4e0d\u662f\u4f1a\u62d6\u7d2f\u7cfb\u7edf\u7684\u6027\u80fd\uff1f\u7406\u8bba\u4e0a\u662f\u7684\uff0c\u4f46\u5b9e\u9645\u4e0a\u53ef\u80fd\u6027\u5e76\u4e0d\u662f\u5f88\u5927\u3002\u5e76\u4e14\u5185\u6838\u63d0\u4f9b\u4e86\u4e00\u4e2a\u53eb\u505a swappiness \u7684\u53c2\u6570\uff0c\u7528\u4e8e\u914d\u7f6e\u9700\u8981\u5c06\u5185\u5b58\u4e2d\u4e0d\u5e38\u7528\u7684\u6570\u636e\u79fb\u5230 swap \u4e2d\u53bb\u7684\u7d27\u8feb\u7a0b\u5ea6\u3002\u8fd9\u4e2a\u53c2\u6570\u7684\u53d6\u503c\u8303\u56f4\u662f 0\uff5e100\uff0c0 \u544a\u8bc9\u5185\u6838\u5c3d\u53ef\u80fd\u7684\u4e0d\u8981\u5c06\u5185\u5b58\u6570\u636e\u79fb\u5230 swap \u4e2d\uff0c\u4e5f\u5373\u53ea\u6709\u5728\u8feb\u4e0d\u5f97\u5df2\u7684\u60c5\u51b5\u4e0b\u624d\u8fd9\u4e48\u505a\uff0c\u800c 100 \u544a\u8bc9\u5185\u6838\u53ea\u8981\u6709\u53ef\u80fd\uff0c\u5c3d\u91cf\u7684\u5c06\u5185\u5b58\u4e2d\u4e0d\u5e38\u8bbf\u95ee\u7684\u6570\u636e\u79fb\u5230 swap \u4e2d\u3002\u5728 ubuntu \u7cfb\u7edf\u4e2d\uff0cswappiness \u7684\u9ed8\u8ba4\u503c\u662f 60\u3002\u5982\u679c\u6211\u4eec\u89c9\u7740\u5185\u5b58\u5145\u8db3\uff0c\u53ef\u4ee5\u5728 \/etc\/sysctl.conf \u6587\u4ef6\u4e2d\u8bbe\u7f6e swappiness\uff1a<\/p>\n<pre>vm.swappiness=10\r\n<\/pre>\n<p>\u5982\u679c\u7cfb\u7edf\u7684\u5185\u5b58\u4e0d\u8db3\uff0c\u5219\u9700\u8981\u6839\u636e\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\u6765\u8bbe\u7f6e\u4ea4\u6362\u7a7a\u95f4\u7684\u5927\u5c0f\u3002\u5177\u4f53\u7684\u7b56\u7565\u7f51\u4e0a\u6709\u5f88\u4e30\u5bcc\u7684\u8d44\u6599\uff0c\u8fd9\u91cc\u7b14\u8005\u4e0d\u518d\u8d58\u8ff0\u3002<\/p>\n<h3><strong>\/proc\/meminfo \u6587\u4ef6<\/strong><\/h3>\n<p>\u5176\u5b9e free \u547d\u4ee4\u4e2d\u7684\u4fe1\u606f\u90fd\u6765\u81ea\u4e8e \/proc\/meminfo \u6587\u4ef6\u3002\/proc\/meminfo \u6587\u4ef6\u5305\u542b\u4e86\u66f4\u591a\u66f4\u539f\u59cb\u7684\u4fe1\u606f\uff0c\u53ea\u662f\u770b\u8d77\u6765\u4e0d\u592a\u76f4\u89c2\uff1a<\/p>\n<pre>$ cat \/proc\/meminfo\r\n<\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20240401\/1711943311660a2e8f6ba87.jpg\" class=\"aligncenter\" title=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe4\" alt=\"linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u63d2\u56fe4\" \/><\/p>\n<p>\u6709\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5\u76f4\u63a5\u67e5\u770b\u8fd9\u4e2a\u6587\u4ef6\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\u7c73\u4e91\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>linux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528 \u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300alinux\u4e2dfree\u547d\u4ee4\u600e\u4e48\u4f7f\u7528\u300b\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01 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free \u547d\u4ee4\u7684\u57fa\u672c\u683c\u5f0f\u5982\u4e0b\uff1a #&nbsp;free&nbsp;[\u9009\u9879] \u8868 1 \u7f57\u5217\u51fa\u4e86\u6b64\u547d\u4ee4\u5e38\u7528\u7684\u9009\u9879\u53ca\u5404\u81ea\u7684\u542b\u4e49\u3002 \u8868 1 free \u547d\u4ee4\u5e38\u7528\u9009\u9879\u53ca\u542b\u4e49 \u9009\u9879 \u542b\u4e49 -b \u4ee5 Byte\uff08\u5b57\u8282\uff09\u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002 -k \u4ee5 KB \u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u6b64\u9009\u9879\u662f free \u547d\u4ee4\u7684\u9ed8\u8ba4\u9009\u9879\u3002 -m \u4ee5 MB \u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002 -g \u4ee5 GB \u4e3a\u5355\u4f4d\uff0c\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002 -t \u5728\u8f93\u51fa\u7684\u6700\u7ec8\u7ed3\u679c\u4e2d\uff0c\u8f93\u51fa\u5185\u5b58\u548c swap \u5206\u533a\u7684\u603b\u91cf\u3002 -o \u4e0d\u663e\u793a\u7cfb\u7edf\u7f13\u51b2\u533a\u8fd9\u4e00\u5217\u3002 -s \u95f4\u9694\u79d2\u6570 \u6839\u636e\u6307\u5b9a\u7684\u95f4\u9694\u65f6\u95f4\uff0c\u6301\u7eed\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002 free \u547d\u4ee4\u53ef\u4ee5\u663e\u793a\u7cfb\u7edf\u4e2d\u5269\u4f59\u53ca\u5df2\u7528\u7684\u7269\u7406\u5185\u5b58\u548c\u4ea4\u6362\u5185\u5b58\uff0c\u4ee5\u53ca\u5171\u4eab\u5185\u5b58\u548c\u88ab\u6838\u5fc3\u4f7f\u7528\u7684\u7f13\u51b2\u533a\u3002 \u5982\u679c\u52a0\u4e0a -h \u9009\u9879\uff0c\u8f93\u51fa\u7684\u7ed3\u679c\u4f1a\u53cb\u597d\u5f88\u591a\uff1a \u6709\u65f6\u6211\u4eec\u9700\u8981\u6301\u7eed\u7684\u89c2\u5bdf\u5185\u5b58\u7684\u72b6\u51b5\uff0c\u6b64\u65f6\u53ef\u4ee5\u4f7f\u7528 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