{"id":2264,"date":"2015-08-25T16:21:08","date_gmt":"2015-08-25T08:21:08","guid":{"rendered":"http:\/\/www.chenlianfu.com\/?p=2264"},"modified":"2015-08-25T16:21:08","modified_gmt":"2015-08-25T08:21:08","slug":"linux%e4%b8%8b%e6%b5%8b%e8%af%95%e7%a3%81%e7%9b%98%e7%9a%84%e8%af%bb%e5%86%99io%e9%80%9f%e5%ba%a6","status":"publish","type":"post","link":"http:\/\/www.chenlianfu.com\/?p=2264","title":{"rendered":"linux\u4e0b\u6d4b\u8bd5\u78c1\u76d8\u7684\u8bfb\u5199IO\u901f\u5ea6"},"content":{"rendered":"

\u8f6c\u8f7d\u4e8e\uff1ahttp:\/\/blog.chinaunix.net\/uid-24250828-id-3239100.html<\/p>\n

\u6709\u65f6\u5019\u6211\u4eec\u5728\u505a\u7ef4\u62a4\u7684\u65f6\u5019\uff0c\u603b\u4f1a\u9047\u5230\u7c7b\u4f3c\u4e8eIO\u7279\u522b\u9ad8\uff0c\u4f46\u4e0d\u80fd\u5224\u5b9a\u662fIO\u74f6\u9888\u8fd8\u662f\u8f6f\u4ef6\u53c2\u6570\u8bbe\u7f6e\u4e0d\u5f53\u5bfc\u81f4\u70ed\u76d8\u7684\u95ee\u9898.\u8fd9\u65f6\u5019\u901a\u5e38\u5e0c\u671b\u80fd\u77e5\u9053\u78c1\u76d8\u7684\u8bfb\u5199\u901f\u5ea6\uff0c\u6765\u8fdb\u884c\u4e0b\u4e00\u6b65\u7684\u51b3\u7b56.<\/p>\n

\u4e0b\u9762\u662f\u4e24\u79cd\u6d4b\u8bd5\u65b9\u6cd5\uff1a
\n(1)\u4f7f\u7528hdparm\u547d\u4ee4
\n\u8fd9\u662f\u4e00\u4e2a\u662f\u7528\u6765\u83b7\u53d6ATA\/IDE\u786c\u76d8\u7684\u53c2\u6570\u7684\u547d\u4ee4,\u662f\u7531\u65e9\u671fLinux IDE\u9a71\u52a8\u7684\u5f00\u53d1\u548c\u7ef4\u62a4\u4eba\u5458 Mark Lord\u5f00\u53d1\u7f16\u5199\u7684( hdparm has been written by Mark Lord , the primary developer and maintainer of the (E)IDE driver for Linux, with suggestions from many netfolk).\u8be5\u547d\u4ee4\u5e94\u8be5\u4e5f\u662f\u4ec5\u7528\u4e8eLinux\u7cfb\u7edf,\u5bf9\u4e8eUNIX\u7cfb\u7edf\uff0cATA\/IDE\u786c\u76d8\u7528\u7684\u53ef\u80fd\u6bd4\u8f83\u5c11\uff0c\u4e00\u822c\u5927\u578b\u7684\u7cfb\u7edf\u90fd\u662f\u4f7f\u7528\u78c1\u76d8\u9635\u5217\u7684.<\/p>\n

\u4f7f\u7528\u65b9\u6cd5\u5f88\u7b80\u5355
\n# hdparm -Tt \/dev\/sda<\/p>\n

\/dev\/sda:
\nTiming cached reads: 6676 MB in 2.00 seconds = 3340.18 MB\/sec
\nTiming buffered disk reads: 218 MB in 3.11 seconds = 70.11 MB\/sec<\/p>\n

\u53ef\u4ee5\u770b\u5230,2\u79d2\u949f\u8bfb\u53d6\u4e866676MB\u7684\u7f13\u5b58,\u7ea6\u54083340.18 MB\/sec;
\n\u57283.11\u79d2\u4e2d\u8bfb\u53d6\u4e86218MB\u78c1\u76d8(\u7269\u7406\u8bfb),\u8bfb\u53d6\u901f\u5ea6\u7ea6\u540870.11 MB\/sec<\/p>\n

(2)\u4f7f\u7528dd\u547d\u4ee4
\n\u8fd9\u4e0d\u662f\u4e00\u4e2a\u4e13\u4e1a\u7684\u6d4b\u8bd5\u5de5\u5177\uff0c\u4e0d\u8fc7\u5982\u679c\u5bf9\u4e8e\u6d4b\u8bd5\u7ed3\u679c\u7684\u8981\u6c42\u4e0d\u662f\u5f88\u82db\u523b\u7684\u8bdd,\u5e73\u65f6\u53ef\u4ee5\u4f7f\u7528\u6765\u5bf9\u78c1\u76d8\u7684\u8bfb\u5199\u901f\u5ea6\u4f5c\u4e00\u4e2a\u7b80\u5355\u7684\u8bc4\u4f30.
\n\u53e6\u5916\u7531\u4e8e\u8fd9\u662f\u4e00\u4e2a\u514d\u8d39\u8f6f\u4ef6,\u57fa\u672c\u4e0a\u00d7NIX\u7cfb\u7edf\u4e0a\u90fd\u6709\u5b89\u88c5,\u5bf9\u4e8eOracle\u88f8\u8bbe\u5907\u7684\u590d\u5236\u8fc1\u79fb,dd\u5de5\u5177\u4e00\u822c\u90fd\u662f\u9996\u9009.<\/p>\n

\u5728\u4f7f\u7528\u524d\u9996\u5148\u4e86\u89e3\u4e24\u4e2a\u7279\u6b8a\u8bbe\u5907
\n\/dev\/null \u4f2a\u8bbe\u5907,\u56de\u6536\u7ad9.\u5199\u8be5\u6587\u4ef6\u4e0d\u4f1a\u4ea7\u751fIO
\n\/dev\/zero \u4f2a\u8bbe\u5907,\u4f1a\u4ea7\u751f\u7a7a\u5b57\u7b26\u6d41,\u5bf9\u5b83\u4e0d\u4f1a\u4ea7\u751fIO<\/p>\n

\u6d4b\u8bd5\u65b9\u6cd5:
\na.\u6d4b\u8bd5\u78c1\u76d8\u7684IO\u5199\u901f\u5ea6
\n# time dd if=\/dev\/zero of=\/test.dbf bs=8k count=300000
\n300000+0 records in
\n300000+0 records out
\n10.59s real 0.43s user 9.40s system
\n# du -sm \/test.dbf
\n2347 \/test.dbf<\/p>\n

\u53ef\u4ee5\u770b\u5230,\u572810.59\u79d2\u7684\u65f6\u95f4\u91cc\uff0c\u751f\u62102347M\u7684\u4e00\u4e2a\u6587\u4ef6,IO\u5199\u7684\u901f\u5ea6\u7ea6\u4e3a221.6MB\/sec;
\n\u5f53\u7136\u8fd9\u4e2a\u901f\u5ea6\u53ef\u4ee5\u591a\u6d4b\u8bd5\u51e0\u904d\u53d6\u4e00\u4e2a\u5e73\u5747\u503c,\u7b26\u5408\u6982\u7387\u7edf\u8ba1.<\/p>\n

b.\u6d4b\u8bd5\u78c1\u76d8\u7684IO\u8bfb\u901f\u5ea6
\n# df -m
\nFilesystem 1M-blocks Used Available Use% Mounted on
\n\/dev\/mapper\/VolGroup00-LogVol00
\n19214 9545 8693 53% \/
\n\/dev\/sda1 99 13 82 14% \/boot
\nnone 506 0 506 0% \/dev\/shm<\/p>\n

# time dd if=\/dev\/mapper\/VolGroup00-LogVol00 of=\/dev\/null bs=8k
\n2498560+0 records in
\n2498560+0 records out
\n247.99s real 1.92s user 48.64s system<\/p>\n

\u4e0a\u9762\u7684\u8bd5\u9a8c\u5728247.99\u79d2\u7684\u65f6\u95f4\u91cc\u8bfb\u53d6\u4e8619214MB\u7684\u6587\u4ef6,\u8ba1\u7b97\u4e0b\u6765\u5e73\u5747\u901f\u5ea6\u4e3a77.48MB\/sec<\/p>\n

c.\u6d4b\u8bd5IO\u540c\u65f6\u8bfb\u548c\u5199\u7684\u901f\u5ea6
\n# time dd if=\/dev\/sda1 of=test.dbf bs=8k
\n13048+1 records in
\n13048+1 records out
\n3.73s real 0.04s user 2.39s system
\n# du -sm test.dbf
\n103 test.dbf<\/p>\n

\u4e0a\u9762\u6d4b\u8bd5\u7684\u6570\u636e\u91cf\u6bd4\u8f83\u5c0f\uff0c\u4ec5\u4f5c\u4e3a\u53c2\u8003.<\/p>\n

\u76f8\u6bd4\u4e24\u79cd\u65b9\u6cd5:
\n\u524d\u8005\u662flinux\u4e0a\u4e13\u4e1a\u7684\u6d4b\u8bd5IDE\/ATA\u78c1\u76d8\u7684\u5de5\u5177,\u4f46\u662f\u4f7f\u7528\u8303\u56f4\u6709\u5c40\u9650\u6027;(\u6b64\u8bd5\u9a8c\u4ec5\u4ec5\u4f7f\u7528\u4e86\u6d4b\u8bd5\u78c1\u76d8IO\u7684\u53c2\u6570,\u5bf9\u4e8e\u5176\u4ed6\u53c2\u6570\u53ca\u89e3\u91ca\u53c2\u8003man\u624b\u518c)
\n\u540e\u8005\u53ef\u4ee5\u901a\u7528,\u4f46\u4e0d\u591f\u4e13\u4e1a,\u4e5f\u6ca1\u6709\u8003\u8651\u5230\u7f13\u5b58\u548c\u7269\u7406\u8bfb\u7684\u533a\u5206\uff0c\u6d4b\u8bd5\u7684\u6570\u636e\u4e5f\u662f\u4ec5\u4f5c\u53c2\u8003\uff0c\u4e0d\u80fd\u7b97\u662f\u6743\u5a01.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u8f6c\u8f7d\u4e8e\uff1ahttp:\/\/blog.chinaunix.net\/uid-242508 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts\/2264"}],"collection":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2264"}],"version-history":[{"count":1,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts\/2264\/revisions"}],"predecessor-version":[{"id":2265,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=\/wp\/v2\/posts\/2264\/revisions\/2265"}],"wp:attachment":[{"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2264"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2264"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.chenlianfu.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}