{"id":237,"date":"2013-01-05T17:35:44","date_gmt":"2013-01-05T09:35:44","guid":{"rendered":"http:\/\/www.shuran.cn\/?p=237"},"modified":"2013-01-05T17:35:44","modified_gmt":"2013-01-05T09:35:44","slug":"%e6%9f%a5%e7%9c%8biowait-%e4%bd%bf%e7%94%a8block_dump-%e6%8a%93%e5%8c%85","status":"publish","type":"post","link":"https:\/\/www.shuran.cn\/?p=237","title":{"rendered":"\u67e5\u770bIOWAIT \u4f7f\u7528block_dump \u6293\u5305"},"content":{"rendered":"

\u5148\u505c\u6389syslog
\nservice syslog stop<\/p>\n

\u6253\u5f00block dump:
\necho 1 > \/proc\/sys\/vm\/block_dump<\/p>\n

\u591a\u6b21\u8fd0\u884c\uff0c\u67e5\u770b\u7ed3\u679c
\ndmesg | egrep \"READ|WRITE|dirtied\" | egrep -o '([a-zA-Z]*)' | sort | uniq -c | sort -rn | head
\n\u6392\u524d\u7684\u6bd4\u8f83\u5360\u7528io<\/p>\n

\u6293\u5b8c\u540e\u5173\u6389block_dump\u548c\u542f\u52a8syslog:
\necho 0 > \/proc\/sys\/vm\/block_dump
\nservice syslog start
\n<\/a>
\n\u6211\u7684\u4e00\u53f0\u8d1f\u8377\u8f83\u91cd\u7684\u670d\u52a1\u5668\uff0ciowait\u7ecf\u5e38\u572810%\u4ee5\u4e0a\uff0c\u56e0\u6b64\u8fd9\u6837\u67e5\u770b\u4e86\u4e0b\uff0c\u591a\u6b21\u8fd0\u884c\u663e\u793a\uff1a<\/p>\n

1283 kjournald
\n1059 httpd
\n190 pdflush
\n-------------------------------------
\n1267 kjournald
\n1228 httpd
\n2 pdflush
\n-------------------------------------
\n1506 pdflush
\n661 kjournald
\n423 httpd
\n11 sh
\n6 nrpe
\n6 bash
\n3 check
\n2 egrep
\n-------------------------------------
\n1247 kjournald
\n1187 httpd
\n6 egrep
\n-------------------------------------
\n1288 httpd
\n1148 kjournald
\n6 egrep
\n-------------------------------------
\n1242 kjournald
\n1120 httpd
\n57 php
\n30 crond
\n8 bash
\n6 egrep
\n-------------------------------------<\/p>\n

\u770b\u6765kjournald\u662f\u7f6a\u9b41\u7978\u9996\uff1fhttpd\u4e5f\u86ee\u9ad8\u7684\uff0c\u9700\u8981\u4f18\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5148\u505c\u6389syslog service syslog stop \u6253\u5f00block dump: echo 1 >\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-237","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/www.shuran.cn\/index.php?rest_route=\/wp\/v2\/posts\/237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shuran.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuran.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuran.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuran.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=237"}],"version-history":[{"count":2,"href":"https:\/\/www.shuran.cn\/index.php?rest_route=\/wp\/v2\/posts\/237\/revisions"}],"predecessor-version":[{"id":239,"href":"https:\/\/www.shuran.cn\/index.php?rest_route=\/wp\/v2\/posts\/237\/revisions\/239"}],"wp:attachment":[{"href":"https:\/\/www.shuran.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuran.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuran.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}