{"id":352,"date":"2016-01-14T19:11:50","date_gmt":"2016-01-14T11:11:50","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=352"},"modified":"2016-01-14T19:16:50","modified_gmt":"2016-01-14T11:16:50","slug":"linux%e7%a3%81%e7%9b%98%e8%af%bb%e5%86%99%e9%80%9f%e5%ba%a6%e6%b5%8b%e8%af%95","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/uncategorized\/linux%e7%a3%81%e7%9b%98%e8%af%bb%e5%86%99%e9%80%9f%e5%ba%a6%e6%b5%8b%e8%af%95\/","title":{"rendered":"Linux\u78c1\u76d8\u8bfb\u5199\u901f\u5ea6\u6d4b\u8bd5"},"content":{"rendered":"<p>\u6d4b\u8bd5\u78c1\u76d8\u7684IO\u5199\u901f\u5ea6<br \/>[root@45-113-120-78 home]# time dd if=\/dev\/zero of=\/test.dbf bs=8k count=300000<br \/>300000+0 records in<br \/>300000+0 records out<br \/>2457600000 bytes (2.5 GB) copied, 1.13061 s, 2.2 GB\/s<\/p>\n<p>real\u00a0\u00a0\u00a0 0m1.132s<br \/>user\u00a0\u00a0\u00a0 0m0.023s<br \/>sys\u00a0\u00a0\u00a0\u00a0 0m1.105s<\/p>\n<p>&nbsp;<\/p>\n<p>\u6d4b\u8bd5\u78c1\u76d8\u7684IO\u8bfb\u901f\u5ea6<br \/>[root@45-113-120-78 home]# time dd if=\/home\/test of=\/dev\/null bs=8k<br \/>128000+0 records in<br \/>128000+0 records out<br \/>1048576000 bytes (1.0 GB) copied, 0.201303 s, 5.2 GB\/s<\/p>\n<p>real\u00a0\u00a0\u00a0 0m0.204s<br \/>user\u00a0\u00a0\u00a0 0m0.011s<br \/>sys\u00a0\u00a0\u00a0\u00a0 0m0.193s<\/p>\n<p>\u78c1\u76d8\u8bfb\u5199\u901f\u5ea6<\/p>\n<p>[root@45-113-120-78 home]#yum -y install hdparm<br \/>[root@45-113-120-78 home]#\u00a0 hdparm -Tt \/dev\/vda<\/p>\n<p>\/dev\/vda:<br \/>\u00a0Timing cached reads:\u00a0\u00a0 26894 MB in\u00a0 2.00 seconds = 13462.99 MB\/sec<br \/>\u00a0Timing buffered disk reads: 566 MB in\u00a0 3.00 seconds = 188.60 MB\/sec<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6d4b\u8bd5\u78c1\u76d8\u7684IO\u5199\u901f\u5ea6[root@45-113-120-78 home]# time dd if=\/dev\/ze &#8230; <a title=\"Linux\u78c1\u76d8\u8bfb\u5199\u901f\u5ea6\u6d4b\u8bd5\" class=\"read-more\" href=\"https:\/\/cn.hostease.com\/xueyuan\/uncategorized\/linux%e7%a3%81%e7%9b%98%e8%af%bb%e5%86%99%e9%80%9f%e5%ba%a6%e6%b5%8b%e8%af%95\/\" aria-label=\"\u9605\u8bfb Linux\u78c1\u76d8\u8bfb\u5199\u901f\u5ea6\u6d4b\u8bd5\">\u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[49,1],"tags":[38,142],"class_list":["post-352","post","type-post","status-publish","format-standard","hentry","category-linux","category-uncategorized","tag-linux","tag-142"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/352","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=352"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/352\/revisions"}],"predecessor-version":[{"id":353,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/352\/revisions\/353"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=352"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=352"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=352"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}