{"id":1743,"date":"2021-02-15T06:21:02","date_gmt":"2021-02-14T22:21:02","guid":{"rendered":"http:\/\/blog.zengqq.com.cn\/?p=1743"},"modified":"2021-02-15T10:53:57","modified_gmt":"2021-02-15T02:53:57","slug":"%e5%b0%8f%e5%86%85%e5%ad%98%e6%9c%8d%e5%8a%a1%e5%99%a8%e8%b0%83%e7%94%a8swap","status":"publish","type":"post","link":"https:\/\/blog.zengqq.com.cn\/?p=1743","title":{"rendered":"\u5c0f\u5185\u5b58\u670d\u52a1\u5668\u8c03\u7528SWAP"},"content":{"rendered":"\n<p><strong>\u9996\u5148\u4f7f\u7528free -m\u547d\u4ee4\u67e5\u770b\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u548cswap\u7684\u5927\u5c0f<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"734\" height=\"101\" src=\"https:\/\/blog.zengqq.com.cn\/wp-content\/uploads\/2021\/02\/\u5c4f\u5e55\u5feb\u7167-2021-02-15-\u4e0a\u534810.41.38.png\" alt=\"\" class=\"wp-image-1769\" srcset=\"https:\/\/blog.zengqq.com.cn\/wp-content\/uploads\/2021\/02\/\u5c4f\u5e55\u5feb\u7167-2021-02-15-\u4e0a\u534810.41.38.png 734w, https:\/\/blog.zengqq.com.cn\/wp-content\/uploads\/2021\/02\/\u5c4f\u5e55\u5feb\u7167-2021-02-15-\u4e0a\u534810.41.38-480x66.png 480w\" sizes=\"auto, (max-width: 734px) 100vw, 734px\" \/><\/figure>\n\n\n\n<p><strong>\u5173\u95edswap\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801233605380-1371540097.png\" alt=\"\"\/><figcaption>Sudo swap off -a<\/figcaption><\/figure>\n\n\n\n<p><strong>\u8bbe\u7f6eswap\u7684\u5927\u5c0f\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801235840365-2014639617.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>bs\u6307\u7684\u662fBlock Size\uff0c\u5c31\u662f\u6bcf\u4e00\u5757\u7684\u5927\u5c0f\u3002\u8fd9\u91cc\u7684\u4f8b\u5b50\u662f1M\uff0c\u610f\u601d\u5c31\u662fcount\u7684\u6570\u5b57\uff0c\u662f\u4ee51M\u4e3a\u5355\u4f4d\u7684\u3002<\/p>\n\n\n\n<p>count\u662f\u544a\u8bc9\u7a0b\u5e8f\uff0c\u65b0\u7684swapfile\u8981\u591a\u5c11\u4e2ablock\u3002\u8fd9\u91cc\u662f1024\uff0c\u5c31\u662f\u8bf4\uff0c\u65b0\u7684swap\u6587\u4ef6\u662f5G\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\uff1a\u53ef\u80fd\u9700\u8981\u70b9\u65f6\u95f4\u5b8c\u6210\u6b64\u6b65\uff0c\u8010\u5fc3\u7b49\u5f85\u5b8c\u6210\u3002<\/p>\n\n\n\n<p><strong>\u628a\u589e\u5927\u540e\u7684\u6587\u4ef6\u53d8\u4e3aswap\u6587\u4ef6\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801234013802-1843684305.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>\u91cd\u65b0\u6253\u5f00swap\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801234111396-2037014768.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>&nbsp;\u8ba9swap\u5728\u542f\u52a8\u7684\u65f6\u5019\uff0c\u81ea\u52a8\u751f\u6548\u3002\u6253\u5f00\/etc\/fstab\u6587\u4ef6\uff0c\u52a0\u4e0a\u4ee5\u4e0b\u547d\u4ee4\u3002\u7136\u540e\u4fdd\u5b58\u3002<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801234609755-1787384511.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>\u518d\u6b21\u67e5\u8be2swap\u5927\u5c0f\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801234842661-636586162.png\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>\u8bbe\u7f6eswappiness\u7684\u6bd4\u4f8b\u503c\uff1a<\/strong><\/p>\n\n\n\n<p>&nbsp; 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&nbsp; &nbsp; &nbsp;\u4e5f\u5c31\u662f\u8bf4linux&nbsp;\u4f1a\u4f7f\u7528\u786c\u76d8\u7684\u4e00\u90e8\u5206\u505a\u4e3aswap\u5206\u533a\uff0c\u7528\u6765\u8fdb\u884c\u8fdb\u7a0b\u8c03\u5ea6&#8211;\u8fdb\u7a0b\u662f\u6b63\u5728\u8fd0\u884c\u7684\u7a0b\u5e8f&#8211;\u628a\u5f53\u524d\u4e0d\u7528\u7684\u8fdb\u7a0b\u8c03\u6210\u2018\u7b49\u5f85\uff08standby\uff09\u2018\uff0c\u751a\u81f3\u2018\u7761\u7720\uff08sleep\uff09\u2019\uff0c\u4e00\u65e6\u8981\u7528\uff0c\u518d\u8c03\u6210\u2018\u6d3b\u52a8\uff08active\uff09\u2019\uff0c\u7761\u7720\u7684\u8fdb\u7a0b\u5c31\u8eba\u5230SWAP\u5206\u533a\u7761\u5927\u89c9\uff0c\u628a\u5185\u5b58\u7a7a\u51fa\u6765\u8ba9\u7ed9\u2018\u6d3b\u52a8\u2019\u7684\u8fdb\u7a0b\u3002&nbsp;\u3000\u3000\u5982\u679c\u5185\u5b58\u591f\u5927\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u5e94\u8be5\u8ba9&nbsp;linux&nbsp;\u4e0d\u5fc5\u592a\u591a\u7684\u4f7f\u7528swap\u5206\u533a\uff0c&nbsp;\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539swappiness\u7684\u6570\u503c\u3002\u5f53swappiness\u4e3a0\u7684\u65f6\u5019\u8868\u793a\u6700\u5927\u9650\u5ea6\u4f7f\u7528\u7269\u7406\u5185\u5b58\uff0c\u7136\u540e\u624d\u662f&nbsp;swap\u7a7a\u95f4\uff0c\u5f53swappines\u4e3a100\u7684\u65f6\u5019\uff0c\u5219\u8868\u793a\u79ef\u6781\u7684\u4f7f\u7528swap\u5206\u533a\uff0c\u5e76\u4e14\u628a\u5185\u5b58\u4e0a\u7684\u6570\u636e\u53ca\u65f6\u7684\u642c\u8fd0\u5230swap\u7a7a\u95f4\u91cc\u9762\u3002<br>&nbsp; &nbsp; &nbsp; &nbsp;\u5728CentOS\u3001Red Hat\u3001ubuntu\u7b49\u7cfb\u7edf\u4e2d\uff0cswappiness\u7684\u9ed8\u8ba4\u503c\u90fd\u4e3a60\uff0c\u5982\u679cLinux\u670d\u52a1\u5668\u7684\u5185\u5b58\u5f88\u5c0f\uff0c\u6bd4\u5982\u8bf4\u4f4e\u4e8e4G\uff0c\u90a3\u4e48\u53ef\u4ee5\u4e0d\u7528\u66f4\u6539\u8fd9\u4e2a\u503c\uff0c\u56e0\u4e3a\u6bd5\u7adf\u8003\u8651\u5230\u5185\u5b58\u4e0d\u591f\u7528\u800c\u53bb\u501f\u7528swap\u7684\u60c5\u51b5\u3002\u800c\u76f8\u5bf9\u4e8e\u5f88\u591a\u670d\u52a1\u5668\u6765\u8bf4\uff0c\u76ee\u524d\u8fd8\u662f\u5efa\u8bae\u8bbe\u7f6e\u5728\u503c\u4e3a25\u4ee5\u4e0b\uff0c\u5982\u679c\u8d85\u8fc7\u4e868G\u5185\u5b58\uff0c\u800c\u4e14\u76ee\u524d\u5185\u5b58\u4f7f\u7528\u91cf\u8fd8\u6709\u5269\u4f59\u7684\u8bdd\uff0c\u5efa\u8bae\u76f4\u63a5\u5c06swappiness\u6539\u62100\uff0c\u8fd9\u6837\u53ef\u4ee5\u6700\u5927\u9650\u5ea6\u7684\u4f7f\u7528\u7269\u7406\u5185\u5b58\uff0c\u51cf\u5c11\u786c\u76d8\u7684\u8d1f\u8f7d\uff0c\u540c\u65f6\u52a0\u5feb\u901f\u5ea6\u3002\u4e5f\u907f\u514d\u5728\u4f7f\u7528Memcached\u7684\u65f6\u5019\u51fa\u73b0&#8221;memcached timeout error because of slow response&#8221;\u8fd9\u6837\u7684\u9519\u8bef\u3002&nbsp; &nbsp; &nbsp;&nbsp;<strong>\u5173\u4e8eswappiness\u64cd\u4f5c\u76f8\u5173\u7684\u547d\u4ee4:<\/strong>&nbsp; &nbsp; &nbsp; &nbsp;\u67e5\u770bswappiness\u5f53\u524d\u8bbe\u7f6e\u7684\u503c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801235332615-1128417902.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;\u4fee\u6539swappiness\u7684\u503c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801235505708-1670148516.png\" alt=\"\"\/><\/figure>\n\n\n\n<p>&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; \u4f7fswappiness\u503c\u5728\u4fee\u6539\u540e\uff0c\u91cd\u542f\u4e0d\u4f1a\u5931\u6548\uff1a&nbsp; &nbsp; &nbsp; &nbsp;<img decoding=\"async\" src=\"https:\/\/images2017.cnblogs.com\/blog\/1061756\/201708\/1061756-20170801235559490-320023990.png\" alt=\"\"><br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; \u5728\u6700\u540e\u4e00\u884c\u52a0\u4e0avm.swappiness=30<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148\u4f7f\u7528free -m\u547d\u4ee4\u67e5\u770b\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u548cswa [&#8230;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[253,249],"tags":[309,314,315,313,316],"class_list":["post-1743","post","type-post","status-publish","format-standard","hentry","category-fun","category-technology","tag-512m","tag-centos","tag-swap","tag-313","tag-316"],"_links":{"self":[{"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/1743","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1743"}],"version-history":[{"count":5,"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/1743\/revisions"}],"predecessor-version":[{"id":1773,"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/1743\/revisions\/1773"}],"wp:attachment":[{"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1743"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1743"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.zengqq.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1743"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}