{"id":250,"date":"2021-07-28T13:30:54","date_gmt":"2021-07-28T05:30:54","guid":{"rendered":"http:\/\/egonlin.com\/?p=250"},"modified":"2022-10-26T08:20:25","modified_gmt":"2022-10-26T00:20:25","slug":"%e7%ac%ac%e5%9b%9b%e8%8a%82%ef%bc%9a%e6%b5%8b%e8%af%95%e7%a1%ac%e7%9b%98%e8%af%bb%e5%86%99","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=250","title":{"rendered":"\u7b2c\u56db\u8282\uff1a\u6d4b\u8bd5\u786c\u76d8\u8bfb\u5199"},"content":{"rendered":"<h1>\u4e00 \u50a8\u5907\u77e5\u8bc6<\/h1>\n<ul>\n<li>\n<p>1\u3001\u78c1\u76d8\u7684\u7ed3\u6784<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666508678454.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666508678454.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666508853867.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666508853867.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<\/li>\n<li>\n<p>2\u3001MB\u548cMIB\u7684\u533a\u522b<br \/>\nMB\u7b49\u5355\u4f4d\u4ee510\u4e3a\u5e95\u6570\u7684\u6307\u6570\u3002<br \/>\nMiB\u662f\u4ee52\u4e3a\u5e95\u6570\u7684\u6307\u6570\u3002<br \/>\n\u5982\uff1a1KB=10^3=1000, 1MB=10^6=1000000=1000KB,1GB=10^9=1000000000=1000MB<br \/>\n\u800c 1KiB=2^10=1024,1MiB=2^20=1048576=1024KiB<br \/>\n\u6362\u7b97\u5355\u4f4d\u5982\u56fe\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666579605446.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666579605446.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<\/li>\n<li>\n<p>3\u3001\u673a\u68b0\u78c1\u76d8\u4e00\u6b21I\/O\u8017\u8d39\u7684\u65f6\u95f4\u7531\u4e09\u90e8\u5206\u6784\u6210<\/p>\n<pre><code>\uff081\uff09\u5bf9\u4e8e\u78c1\u76d8\u6765\u8bf4\u4e00\u4e2a\u5b8c\u6574\u7684IO\u64cd\u4f5c\u662f\u8fd9\u6837\u8fdb\u884c\u7684\uff1a\u5f53\u63a7\u5236\u5668\u5bf9\u78c1\u76d8\u53d1\u51fa\u4e00\u4e2aIO\u64cd\u4f5c\u547d\u4ee4\u7684\u65f6\u5019\uff0c\u78c1\u76d8\u7684\u9a71\u52a8\u81c2(Actuator Arm)\u5e26\u8bfb\u5199\u78c1\u5934(Head)\u79bb\u5f00\u7740\u9646\u533a(Landing Zone\uff0c\u4f4d\u4e8e\u5185\u5708\u6ca1\u6709\u6570\u636e\u7684\u533a\u57df)\uff0c\u79fb\u52a8\u5230\u8981\u64cd\u4f5c\u7684\u521d\u59cb\u6570\u636e\u5757\u6240\u5728\u7684\u78c1\u9053(Track)\u7684\u6b63\u4e0a\u65b9\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u88ab\u79f0\u4e3a\u5bfb\u5740(Seeking)\uff0c\u5bf9\u5e94\u6d88\u8017\u7684\u65f6\u95f4\u88ab\u79f0\u4e3a\u5bfb\u5740\u65f6\u95f4(Seek Time);\n\uff082\uff09\u4f46\u662f\u627e\u5230\u5bf9\u5e94\u78c1\u9053\u8fd8\u4e0d\u80fd\u9a6c\u4e0a\u8bfb\u53d6\u6570\u636e\uff0c\u8fd9\u65f6\u5019\u78c1\u5934\u8981\u7b49\u5230\u78c1\u76d8\u76d8\u7247(Platter)\u65cb\u8f6c\u5230\u521d\u59cb\u6570\u636e\u5757\u6240\u5728\u7684\u6247\u533a(Sector)\u843d\u5728\u8bfb\u5199\u78c1\u5934\u6b63\u4e0a\u65b9\u7684\u4e4b\u540e\u624d\u80fd\u5f00\u59cb\u8bfb\u53d6\u6570\u636e\uff0c\u5728\u8fd9\u4e2a\u7b49\u5f85\u76d8\u7247\u65cb\u8f6c\u5230\u53ef\u64cd\u4f5c\u6247\u533a\u7684\u8fc7\u7a0b\u4e2d\u6d88\u8017\u7684\u65f6\u95f4\u79f0\u4e3a\u65cb\u8f6c\u5ef6\u65f6(Rotational Delay);\n\uff083\uff09\u63a5\u4e0b\u6765\u5c31\u968f\u7740\u76d8\u7247\u7684\u65cb\u8f6c\uff0c\u78c1\u5934\u4e0d\u65ad\u7684\u8bfb\/\u5199\u76f8\u5e94\u7684\u6570\u636e\u5757\uff0c\u76f4\u5230\u5b8c\u6210\u8fd9\u6b21IO\u6240\u9700\u8981\u64cd\u4f5c\u7684\u5168\u90e8\u6570\u636e\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a\u6570\u636e\u4f20\u9001(Data Transfer)\uff0c\u5bf9\u5e94\u7684\u65f6\u95f4\u79f0\u4e3a\u4f20\u9001\u65f6\u95f4(Transfer Time)\u3002\u5b8c\u6210\u8fd9\u4e09\u4e2a\u6b65\u9aa4\u4e4b\u540e\u4e00\u6b21IO\u64cd\u4f5c\u4e5f\u5c31\u5b8c\u6210\u4e86\u3002<\/code><\/pre>\n<p>\u603b\u7ed3\uff1a<br \/>\n\u4e00\u6b21\u78c1\u76d8I\/O\u8017\u8d39\u7684\u65f6\u95f4 = \u5e73\u5747\u5bfb\u9053 + \u5e73\u5747\u5ef6\u8fdf + \u4f20\u8f93\u65f6\u95f4(\u6570\u636e\u4ece\u78c1\u76d8\u8bfb\u5165\u5185\u5b58\u7684\u65f6\u95f4\uff0c\u8fd9\u4e2a\u662f\u672c\u5730\u4f20\u8f93\uff0c\u901f\u5ea6\u5f88\u5feb\uff0c\u8017\u8d39\u65f6\u95f4\u51e0\u4e4e\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1)<\/p>\n<\/li>\n<li>\n<p>4\u3001\u8861\u91cf\u78c1\u76d8\u6027\u80fd\u7684\u4e24\u4e2a\u5e38\u89c1\u7684\u6307\u6807<br \/>\n\uff081\uff09IOPS \uff1a\u82f1\u6587\u5168\u79f0 Input\/Output Operations Per Second \uff0c\u7ffb\u8bd1\u8fc7\u6765\u5c31\u662f<strong>\u6bcf\u79d2\u949f\u78c1\u76d8\u8bfb\u6216\u5199\u7684\u6b21\u6570<\/strong>\uff0c\u5373\u4e00\u79d2\u5185\uff0c\u78c1\u76d8\u5b8c\u6210\u4e86\u591a\u5c11\u6b21\u8bfb\/\u5199\u64cd\u4f5c\u3002\u8fd9\u4e2a\u6570\u503c\u8d8a\u5927\uff0c\u5f53\u7136\u4e5f\u5c31\u8868\u793a\u6027\u80fd\u8d8a\u597d\u3002<br \/>\n\uff082\uff09BPS\uff1a\u662f\u6307<strong>\u6bcf\u79d2\u949f\u78c1\u76d8\u7684I\/O\u6d41\u91cf\uff0c\u5373\u4e00\u79d2\u5185\uff0c\u78c1\u76d8\u5199\u5165\u52a0\u4e0a\u8bfb\u51fa\u7684\u6570\u636e\u603b\u91cf<\/strong>\u3002\uff0c\u4e00\u822c\u4ee5 MB\/s \u4e3a\u5355\u4f4d\u3002\u8fd9\u4e2aBPS\u6709\u65f6\u5019\u4e5f\u88ab\u79f0\u4e3aThroughput\u541e\u5410\u91cf\uff0c\u6216\u8005\u5e26\u5bbdBandwidth\uff0c\u7b80\u79f0 BW<\/p>\n<p>IOPS\u4e0e\u541e\u5410\u91cf\u76f4\u63a5\u7684\u5173\u7cfb\uff0c\u53ef\u4ee5\u7b80\u5355\u7684\u5927\u6982\u7406\u89e3\u4e3a\uff1a\u541e\u5410\u91cf = \u6570\u636e\u5757\u5927\u5c0f *IOPS<br \/>\n\u4ece\u4e0a\u9762\u7684\u7b80\u7565\u516c\u5f0f\u4e2d\u53ef\u4ee5\u770b\u51fa\u6765\uff0c\u5982\u679cIOPS\u56fa\u5b9a\uff0c\u90a3\u4e48\u6570\u636e\u5757\u8d8a\u5927\uff0c\u541e\u5410\u91cf\u81ea\u7136\u8d8a\u5927<br \/>\n\u6700\u5927IOPS\u7684\u7406\u8bba\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\u3002\u4e70\u6765\u4e00\u5757\u78c1\u76d8\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5176\u8f6c\u901f\u5927\u6982\u9884\u4f30\u4e00\u4e0b\u5b83\u53ef\u80fd\u8fbe\u5230\u7684\u7406\u8bbaIOPS\u503c<\/p>\n<pre><code>\uff081\uff09\u5e38\u89c1\u78c1\u76d8\u5e73\u5747\u7269\u7406\u5bfb\u9053\u65f6\u95f4\u4e3a\uff1a\n7200\u8f6c\/\u5206\u7684STAT\u786c\u76d8\u5e73\u5747\u7269\u7406\u5bfb\u9053\u65f6\u95f4\u662f9ms\n10000\u8f6c\/\u5206\u7684STAT\u786c\u76d8\u5e73\u5747\u7269\u7406\u5bfb\u9053\u65f6\u95f4\u662f6ms\n15000\u8f6c\/\u5206\u7684SAS\u786c\u76d8\u5e73\u5747\u7269\u7406\u5bfb\u9053\u65f6\u95f4\u662f4ms\n\uff082\uff09\u5e38\u89c1\u786c\u76d8\u7684\u65cb\u8f6c\u5ef6\u8fdf\u65f6\u95f4\u4e3a\uff1a\n7200 rpm\u7684\u78c1\u76d8\u5e73\u5747\u65cb\u8f6c\u5ef6\u8fdf\u5927\u7ea6\u4e3a\u8f6c\u534a\u5708\u8017\u8d39\u7684\u65f6\u95f4(1\/7200\/60s) \/ 2 = 4.17ms\n10000 rpm\u7684\u78c1\u76d8\u5e73\u5747\u65cb\u8f6c\u5ef6\u8fdf\u5927\u7ea6\u4e3a\u8f6c\u534a\u5708\u8017\u8d39\u7684\u65f6\u95f4(1\/10000\/60s) \/ 2 = 3ms\uff0c\n15000 rpm\u7684\u78c1\u76d8\u5176\u5e73\u5747\u65cb\u8f6c\u5ef6\u8fdf\u7ea6\u4e3a\u8f6c\u534a\u5708\u8017\u8d39\u7684\u65f6\u95f4(1\/15000\/60s) \/ 2 = 2ms\u3002\n(3) \u6700\u5927IOPS\u7684\u7406\u8bba\u8ba1\u7b97\u65b9\u6cd5\nIOPS = 1000 ms\/ (\u5bfb\u9053\u65f6\u95f4 + \u65cb\u8f6c\u5ef6\u8fdf)\u3002\u53ef\u4ee5\u5ffd\u7565\u6570\u636e\u4f20\u8f93\u65f6\u95f4\u3002\n7200 rpm\u7684\u78c1\u76d8IOPS = 1000 \/ (9 + 4.17) = 76 IOPS\n10000 rpm\u7684\u78c1\u76d8IOPS = 1000 \/ (6+ 3) = 111 IOPS\n15000 rpm\u7684\u78c1\u76d8IOPS = 1000 \/ (4 + 2) = 166 IOPS<\/code><\/pre>\n<p>\u6700\u5927IOPS\u7684\u5b9e\u9645\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\u3002\u4e0a\u9762\u7684\u7406\u8bba\u503c\u7ec8\u7a76\u4e0d\u4f1a\u7279\u522b\u51c6\u786e\uff0c\u540e\u671f\u6211\u4eec\u8fd8\u662f\u7528\u4e13\u95e8\u7684\u6d4b\u8bd5\u5de5\u5177\u6bd4\u5982fio\uff0c\u53c2\u8003\u5b9e\u9645\u7684\u8bfb\/\u5199\u91cf\u4e0e\u5b8c\u6210\u65f6\u95f4\u6765\u8fdb\u884c\u8ba1\u7b97\uff0c\u7b80\u5355\u4e3e\u4f8b\u5982\u4e0b<br \/>\n\u793a\u4f8b1\uff1a<\/p>\n<pre><code>\u4f8b1\uff1a\u5b8c\u621010000\u4e2a1KB\u7684I\/O\u8bf7\u6c42\uff0c\u7528\u65f610\u79d2 \n\u572810\u79d2\u5185\u5b8c\u6210\u4e8610000\u4e2aI\/O\u8bf7\u6c42\uff0c\u90a3\u4e481\u79d2\u5185\u5b8c\u6210\u4e861000\u4e2a\uff0c\u6240\u4ee5IOPS=1000\n\u572810\u79d2\u5185\u5b8c\u6210\u4e86\u603b\u517110000 * 1KB\u5927\u5c0f\u7684\u6570\u636e\u91cf\uff0c\u90a3\u4e48Throught(\u541e\u5410\u91cf) = 1MB\/s<\/code><\/pre>\n<p>\u793a\u4f8b1:<\/p>\n<pre><code>\u5b8c\u62101\u4e2a10MB\u7684I\/O\u8bf7\u6c42\uff0c\u7528\u65f60.2\u79d2\nIOPS=5\nThrought(\u541e\u5410\u91cf)=50MB\/s<\/code><\/pre>\n<\/li>\n<li>\n<p>5\u3001\u78c1\u76d8\u7684\u8bfb\u5199\u5355\u4f4d\uff1ablock\u5757\u4e0e\u6247\u533a<br \/>\n\u6587\u4ef6\u7cfb\u7edf\u4e0d\u662f\u4e00\u4e2a\u6247\u533a\u4e00\u4e2a\u6247\u533a\u7684\u6765\u8bfb\u6570\u636e,\u90a3\u6837\u592a\u6162\u4e86,\u6240\u4ee5\u6709\u4e86block(\u5757)\u7684\u6982\u5ff5,\u5b83\u662f\u4e00\u4e2a\u5757\u4e00\u4e2a\u5757\u7684\u8bfb\u53d6\u7684.block\u624d\u662f\u6587\u4ef6\u5b58\u53d6\u7684\u6700\u5c0f\u5355\u4f4d.<br \/>\n\u78c1\u76d8\u7684\u4e00\u6b21io\u7684\u6700\u5c0f\u8bfb\u5199\u5355\u4f4d\u662f\u4e00\u4e2a\u6247\u533a\uff0c\u9ed8\u8ba4512Bytes\uff0c\u64cd\u4f5c\u7cfb\u7edf\u7684\u6587\u4ef6\u7cfb\u7edf\u5982\u679c\u6309\u7167\u4e00\u4e2a\u6247\u533a\u4e00\u4e2a\u6247\u533a\u7684\u8bfb\u5199\uff0c\u90a3\u5c31\u592a\u6162\u4e86\uff0c\u4e8e\u662f\u6709\u4e86block\u5757\u7684\u6982\u5ff5\uff0cblock\u5757\u624d\u662f\u6587\u4ef6\u7cfb\u7edf\u7684\u6700\u5c0f\u5b58\u53d6\u5355\u4f4d<br \/>\n\u2003\u4e00\u4e2ablock\u5757\u4e2d\u6247\u533a\u7684\u4e2a\u6570\u4f9d\u6587\u4ef6\u7cfb\u7edf\u800c\u4e0d\u540c,\u5982\u4e00\u4e2ablock\u67098\u4e2a\u6247\u533a,\u90a3\u4e00\u4e2ablock\u5757\u7684\u5927\u5c0f\u4e3a4K.<\/p>\n<pre><code>[root@test05 ~]# stat \/ |grep -i 'io'  # \u67e5\u770b\u9ed8\u8ba4\u4e00\u4e2ablock\u5757\u5927\u5c0f\u4e3a4096\u4e2a\u5b57\u8282\uff0c\u53738\u4e2a\u6247\u533a\n\u5927\u5c0f\uff1a224        \u5757\uff1a0          IO \u5757\uff1a4096   \u76ee\u5f55<\/code><\/pre>\n<\/li>\n<li>\n<p>6\u3001\u7a0b\u5e8f\u4f7f\u7528\u7684\u5757\u5730\u5740\u4e0e\u78c1\u76d8\u7684\u7269\u7406\u5730\u5740\u662f\u4e24\u4e2a\u6982\u5ff5<br \/>\n\u4e3a\u4e86\u65b9\u4fbf\u7406\u89e3\u4e0b\u9762\u7684\u987a\u5e8f\u8bbf\u95ee\u4e0e\u968f\u673a\u8bbf\u95ee\u7684\u6982\u5ff5\u5148\u6765\u50a8\u5907\u4e24\u4e2a\u77e5\u8bc6\uff1a<br \/>\nPBA\uff08physical block address\u7269\u7406\u5757\u5730\u5740\uff09\uff1a\u7269\u7406\u5730\u5740\u662f\u6570\u636e\u5728\u78c1\u76d8\u4e0a\u7684\u5b9e\u9645\u5730\u5740\u3002<br \/>\nLBA\uff08logical block address \u903b\u8f91\u5757\u5730\u5740\uff09\uff1a\u903b\u8f91\u5730\u5740\u662f\u7a0b\u5e8f\u4e2d\u8ba4\u8bc6\u7684\u5757\u5730\u5740\uff0c\u7f16\u53f7\u987a\u5e8f\u9012\u589e\uff0c\u4e00\u822c\u903b\u8f91\u548c\u7269\u7406\u5730\u5740\u4f1a\u6709\u4e00\u4e2a\u5bf9\u5e94\u5173\u7cfb\uff08\u4f8b\u5982\uff1a\u5bf9\u4e8e\u786c\u76d8\u6765\u8bf4LBA\u4e0ePBA\u5c31\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\uff09<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/10\/image-1666515760635.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/10\/image-1666515760635.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<\/li>\n<li>\n<p>7\u3001\u78c1\u76d8\u7684\u987a\u5e8f\u8bbf\u95ee\u548c\u968f\u673a\u8bbf\u95ee\u662f\u600e\u4e48\u5b9a\u4e49\u7684\u5462\uff1f<br \/>\n\u5982\u679c\u4e00\u6b21IO\u64cd\u4f5c\u8d77\u59cb\u7684\u903b\u8f91\u5757\u5730\u5740logical block address \uff08LBA\uff09\u7d27\u6328\u7740\u4e0a\u4e00\u6b21IO\u64cd\u4f5c\u7684\u7ec8\u6b62 LBA\uff0c\u5c31\u662f\u987a\u5e8f\u8bbf\u95ee\uff0c\u5426\u5219\u5c31\u662f\u968f\u673a\u8bbf\u95ee<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666507507517.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666507507517.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n\u53ea\u6709\u987a\u5e8f\u5199\u624d\u80fd\u4fdd\u8bc1\u987a\u5e8f\u8bfb<br \/>\n\uff081\uff09\u968f\u673aIO\uff1a\u5f53\u8bfb\u53d6\u7b2c\u4e00\u4e2ablock\u65f6,\u8981\u7ecf\u5386\u5bfb\u9053,\u65cb\u8f6c\u5ef6\u8fdf,\u4f20\u8f93\u4e09\u4e2a\u6b65\u9aa4\u624d\u80fd\u8bfb\u53d6\u5b8c\u8fd9\u4e2ablock\u7684\u6570\u636e.\u800c\u5bf9\u4e8e\u4e0b\u4e00\u4e2ablock,\u5982\u679c\u5b83\u5728\u78c1\u76d8\u7684\u67d0\u4e2a\u4f4d\u7f6e,\u8bbf\u95ee\u5b83\u4f1a\u540c\u6837\u7ecf\u5386\u5bfb\u9053,\u65cb\u8f6c,\u5ef6\u65f6,\u4f20\u8f93\u624d\u80fd\u8bfb\u53d6\u5b8c\u8fd9\u4e2ablock\u7684\u6570\u636e, \u6211\u4eec\u628a\u8fd9\u79cd\u65b9\u5f0f\u7684IO\u53eb\u505a\u968f\u673aIO.<br \/>\n\uff082\uff09\u987a\u5e8fIO\uff1a\u4f46\u662f\u5982\u679c\u8fd9\u4e2ablock\u7684\u8d77\u59cb\u6247\u533a\u521a\u597d\u5728\u6211\u521a\u624d\u8bbf\u95ee\u7684block\u7684\u540e\u9762,\u78c1\u5934\u5c31\u80fd\u7acb\u523b\u9047\u5230.\u4e0d\u9700\u7b49\u5f85,\u76f4\u63a5\u4f20\u8f93.\u8fd9\u79cdIO\u5c31\u53eb\u987a\u5e8fIO.<\/p>\n<blockquote>\n<p>\u4e3e\u4f8b\uff1a<br \/>\n\u628a\u78c1\u76d8\u770b\u6210\u4e00\u4e2a\u5149\u76d8\uff0c\u4e0a\u8fb9\u6709\u4e00\u4e2a\u78c1\u5934\u7528\u6765\u5199\u4e1c\u897f\uff0c\u5c31\u50cf\u94a2\u7b14\u5934\u4e00\u6837\uff0c\u8981\u5728\u4e00\u4e2a\u4f4d\u7f6e\u5199\u4e1c\u897f\uff0c\u9700\u8981\u5148\u5c06\u78c1\u5934\u79fb\u52a8\u5230\u90a3\u4e2a\u4f4d\u7f6e\uff0c\u8fd9\u4e2a\u64cd\u4f5c\u53ebseek\uff08\u65cb\u8f6c+\u5bfb\u9053\uff09\uff0c\u63a5\u4e0b\u6765\u5c31\u662f\u5c06\u6570\u636e\u987a\u5e8f\u5199\u4e0b\u53bb\uff08write\uff09\u3002\u5199\u5b8c\u6570\u636e\u4e4b\u540e\u78c1\u5934\u81ea\u52a8\u5411\u540e\u79fb\u52a8\uff0c\u5982\u679c\u7ee7\u7eed\u6328\u7740\u5199\u5c31\u4e0d\u9700\u8981 seek \u4e86\u3002<br \/>\n\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u4ee5\u4e00\u4e2a\u6c49\u5b57\u4e3a\u5355\u4f4d\uff0c\u90a3\u4e48\u987a\u5e8f\u5199\u4e00\u53e5\u8bdd \u201c\u5c0f\u5b69\u513f\u4f60\u597d\u5440\u201d\uff0c\u53ea\u9700\u8981\u5c06\u78c1\u5934 seek \u4e00\u6b21\u5230\u201c\u5c0f\u201d\u8981\u5199\u7684\u4f4d\u7f6e\uff0c\u7136\u540e write \u201c\u5c0f\u201d\uff0c\u63a5\u4e0b\u6765\u76f4\u63a5\u628a\u201c\u5b69\u513f\u4f60\u597d\u5440\u201d \u4e00\u4e2a\u4e2a write \u5230\u540e\u8fb9\u5c31\u53ef\u4ee5\u4e86\uff0c\u8fd9\u4e9b\u5b57\u5728\u78c1\u76d8\u4e0a\u90fd\u5b58\u5728\u4e86\u4e00\u8d77\u3002\u968f\u673a\u5199\u5c31\u662f\u628a\u8fd9\u51e0\u4e2a\u5b57\u5206\u5f00\u5b58\uff0c\u4e92\u76f8\u4e0d\u6328\u7740\u3002\u90a3\u4e48\u5171\u9700\u8981 6 \u6b21 seek\uff0c6\u6b21 write\u3002\u987a\u5e8f\u5199\u603b\u662f\u6bd4\u968f\u673a\u5199\u8981\u597d\u7684\uff0c\u56e0\u4e3a\u968f\u673a\u5199\u591a\u4e86 5 \u6b21 seek \u7684\u65f6\u95f4\u3002<br \/>\n\u4e00\u4e2a HDD \u7684 seek \u8017\u65f6\u662f 10ms\uff0c\u541e\u5410\u7387\u662f 100MB\/s\uff0c\u4e5f\u5c31\u662f\u6bcf\u79d2\u80fd write 100MB \u7684\u6570\u636e\u3002\u90a3\u4e48\u4ee5 1KB \u4e3a\u5355\u4f4d\uff0c\u7eaf write \u8fd9 1KB \u7684\u6570\u636e\u53ea\u9700\u8981 10us \uff0c\u662fseek \u7684 1\/1000\u3002 \u53ef\u4ee5\u770b\u5230 seek \u662f\u5f88\u4e0d\u53cb\u597d\u7684\u3002<br \/>\n\u7531\u4e8eHDD \u53ef\u4ee5\u8986\u76d6\u5199\uff0c\u6240\u4ee5 LBA \u548c PBA \u662f\u4e00\u4e00\u5bf9\u5e94\u7684\uff0c\u8fde\u7eed\u7684\u903b\u8f91\u5730\u5740\u4e5f\u5bf9\u5e94\u4e86\u8fde\u7eed\u7684\u7269\u7406\u5730\u5740\uff0c\u6240\u4ee5\u6709\u968f\u673a\u8bbf\u95ee\u548c\u987a\u5e8f\u8bbf\u95ee\u7684\u533a\u522b\u3002<\/p>\n<\/blockquote>\n<\/li>\n<li>\n<p>8\u3001\u78c1\u76d8\u4e0a\u7684\u8bb0\u5f55\u662f\u987a\u5e8f\u5b58\u50a8\u8fd8\u662f\u968f\u673a\u7684\u5b58\u50a8<br \/>\n\u8001\u5f0f\u7684\u78c1\u5e26\u662f\u5178\u578b\u7684\u987a\u5e8f\u5b58\u50a8\u8bbe\u5907\uff0c\u7279\u70b9\u662f\u5b58\u50a8\u4fe1\u606f\u91cf\u5927\uff0c\u4f46\u8bfb\u53d6\u548c\u5199\u5165\u6570\u636e\u90fd\u8981\u6c42\u5fc5\u987b\u662f\u4ece\u5934\u4e00\u8def\u4e0b\u53bb\uff0c\u4e0d\u80fd\u60f3\u8bfb\u54ea\u4e2a\u6570\u636e\u5c31\u8bfb\u54ea\u4e2a\u3002<br \/>\n\u800c\u73b0\u5728\u7684\u78c1\u76d8\u672c\u8eab\u662f\u968f\u673a\u5b58\u53d6\u7684\u5b58\u50a8\u8bbe\u5907\uff0c\u5b83\u4e0d\u4f1a\u50cf\u8001\u5f0f\u78c1\u5e26\u90a3\u6837\u5f3a\u5236\u8981\u6c42\u4f60\u8bb0\u5f55\u6570\u636e\u5fc5\u987b\u6309\u987a\u5e8f\u5b58\u50a8\uff08\u5b58\u50a8\u7279\u70b9\u662f\u5176\u4e3a\u6bcf\u4e2a\u5b58\u50a8\u5355\u5143\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u7f16\u53f7\uff0c\u5c31\u95e8\u724c\u53f7\u7801\uff0c\u8fd9\u6837\u60f3\u5b58\u53d6\u54ea\u4e2a\u6570\u636e\u90fd\u53ef\u4ee5\uff0c\u53ea\u8981\u6309\u7f16\u53f7\u627e\u5c31\u662f\u4e86\uff09\uff0c\u4f46\u662f\u6211\u4eec\u662f\u53ef\u4ee5\u63a7\u5236\u5199\u6570\u636e\u65f6\u6309\u987a\u5e8f\u5199\u5165\u7684\uff0c\u5bf9\u4e8e\u5927\u578b\u6587\u4ef6\uff0c\u6309\u987a\u5e8f\u5b58\u50a8\u8bb0\u5f55\u4f1a\u63d0\u9ad8\u5b58\u53d6\u6548\u7387\uff0c\u56e0\u4e3a\u964d\u4f4e\u4e86\u5bfb\u9053\u7684\u65f6\u95f4<\/p>\n<\/li>\n<li>\n<p>9\u3001\u90a3\u5982\u4f55\u5b9e\u73b0\u987a\u5e8f\u5199\u5462\uff1f<br \/>\n\u5373\u5982\u4f55\u5b9e\u73b0\u4e00\u4e2a\u6587\u4ef6\u7684\u8fde\u7eed\u5206\u914d\u5462\uff1f\u8be6\u89c1\uff1a<a href=\"https:\/\/egonlin.com\/?p=7663\u7b2c3.1\u5c0f\u8282\">https:\/\/egonlin.com\/?p=7663\u7b2c3.1\u5c0f\u8282<\/a><br \/>\n\u5bf9\u4e8e\u78c1\u76d8\u6765\u8bf4\uff0c\u9ed8\u8ba4\u90fd\u662f\u968f\u673a\u5199\uff0c\u5982\u679c\u4f60\u60f3\u63a7\u5236\u78c1\u76d8\u5b9e\u73b0\u987a\u5e8f\u5199\u5165\uff0c\u600e\u4e48\u505a\u5462\uff1f<br \/>\n\u4e0e\u968f\u673a\u8bfb\u5199\u4e0d\u540c\u7684\u662f\uff0c\u8fde\u7eed\u5206\u914d\u7684\u65b9\u5f0f\u8981\u6c42\u6bcf\u4e2a\u6587\u4ef6\u5728\u78c1\u76d8\u4e0a\u5360\u6709\u4e00\u7ec4\u8fde\u7eed\u7684\u5757\uff0c\u5373\u987a\u5e8f\u8bfb\u5199\u662f\u4f18\u5148\u5206\u914d\u4e00\u5757\u6587\u4ef6\u7a7a\u95f4\uff0c\u7136\u540e\u540e\u7eed\u5185\u5bb9\u8ffd\u52a0\u5230\u5bf9\u5e94\u7a7a\u95f4\u5185\u4ee5\u6b64\u4fdd\u8bc1\u987a\u5e8f\u3002<\/p>\n<blockquote>\n<p>\u8fde\u7eed\u5206\u914d\u7684\u4f18\u7f3a\u70b9<\/p>\n<ul>\n<li>\u4f18\u70b9\uff1a<br \/>\n\u652f\u6301\u987a\u5e8f\u8bbf\u95ee\u548c\u76f4\u63a5\u8bbf\u95ee(\u6216\u8005\u53eb\u968f\u5373\u8bbf\u95ee)\uff0c\u5f53\u7136\u4e86\uff0c\u8fde\u7eed\u5206\u914d\u7684\u6587\u4ef6\u5728\u987a\u5e8f\u8bbf\u95ee\u65f6\u7684\u901f\u5ea6\u662f\u6700\u5feb\u7684\uff0c\u56e0\u4e3a\u901a\u5e38\u60c5\u51b5\u4e0b\u8bfb\u53d6\u67d0\u4e2a\u78c1\u76d8\u5757\u65f6\uff0c\u9700\u8981\u79fb\u52a8\u78c1\u5934\u8fdb\u884c\u5bfb\u9053\uff0c\u5982\u679c\u8bbf\u95ee\u7684\u4e24\u4e2a\u78c1\u76d8\u5757\u76f8\u9694\u8d8a\u8fdc\uff0c\u5bfb\u9053\u65f6\u95f4\u4e45\u4f1a\u8d8a\u957f\uff0c\u800c\u5982\u679c\u662f\u8fde\u7eed\u5206\u914d\u7684\uff0c\u8bfb\u7684\u65f6\u5019\u4e5f\u91c7\u7528\u987a\u5e8f\u8bfb\uff0c\u5c31\u4f1a\u964d\u4f4e\u5f88\u591a\u5bfb\u9053\u65f6\u95f4\uff0c\u901f\u5ea6\u81ea\u7136\u662f\u5feb<\/li>\n<li>\u7f3a\u70b9\uff1a<\/li>\n<li>\uff081\uff09\u3001\u5b58\u50a8\u7a7a\u95f4\u5229\u7528\u7387\u4f4e\uff0c\u4f1a\u4ea7\u751f\u78c1\u76d8\u788e\u7247<br \/>\n<div class='fancybox-wrapper 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src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/10\/image-1666519546367.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n\u5728\u4f7f\u7528\u987a\u5e8fIO\u8fdb\u884c\u6587\u4ef6\u8bfb\u5199\u65f6\u5019\uff0c\u9700\u8981\u77e5\u9053\u4e0a\u6b21\u5199\u5165\u7684\u5730\u65b9\uff0c\u6240\u4ee5\u9700\u8981\u7ef4\u62a4\u4e00\u4e2a\u7d22\u5f15\u6216\u8005\u8f6e\u8be2\u83b7\u5f97\u4e00\u4e2a\u6ca1\u6709\u5199\u5165\u4f4d\u7f6e\u3002<br 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Demand)\uff0c\u5173\u6ce8\u8fde\u7eed\u8bfb\u5199\u6027\u80fd\u3002\u6570\u636e\u541e\u5410\u91cf\u662f\u5173\u952e\u8861\u91cf\u6307\u6807\u3002<\/p>\n<\/li>\n<li>\n<p>13\u3001\u8bfb\/\u5199\u6587\u4ef6\u7684\u5b8c\u6574\u6d41\u7a0b<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666509898916.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/image-1666509898916.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\n\uff081\uff09\u8bfb\u6587\u4ef6<br \/>\n\u7528\u6237\u7a0b\u5e8f\u901a\u8fc7\u7f16\u7a0b\u8bed\u8a00\u63d0\u4f9b\u7684\u8bfb\u53d6\u6587\u4ef6api\u53d1\u8d77\u5bf9\u67d0\u4e2a\u6587\u4ef6\u8bfb\u53d6\u3002\u6b64\u65f6\u7a0b\u5e8f\u5207\u6362\u5230\u5185\u6838\u6001\uff0c\u7528\u6237\u7a0b\u5e8f\u5904\u4e8e\u963b\u585e\u72b6\u6001\u3002\u7531\u4e8e\u8bfb\u53d6\u7684\u5185\u5bb9\u8fd8\u4e0d\u5728\u5185\u6838\u7f13\u51b2\u533a\u4e2d\uff0c\u5bfc\u81f4\u89e6\u53d1OS\u7f3a\u9875\u4e2d\u65ad\u5f02\u5e38\u3002\u7136\u540e\u7531OS\u8d1f\u8d23\u53d1\u8d77\u5bf9\u78c1\u76d8\u6587\u4ef6\u7684\u6570\u636e\u8bfb\u53d6\u3002\u8bfb\u53d6\u5230\u6570\u636e\u540e\uff0c\u5148\u5b58\u653e\u5728OS\u5185\u6838\u7684\u4e3b\u5b58\u7a7a\u95f4\uff0c\u53ebPageCache\u3002\u7136\u540eOS\u518d\u5c06\u6570\u636e\u62f7\u8d1d\u4e00\u4efd\u81f3\u7528\u6237\u8fdb\u7a0b\u7a7a\u95f4\u7684\u4e3b\u5b58ByteBuffer\u4e2d\u3002\u6b64\u65f6\u7a0b\u5e8f\u7531\u5185\u6838\u6001\u5207\u6362\u81f3\u7528\u6237\u6001\u7ee7\u7eed\u8fd0\u884c\u7a0b\u5e8f\u3002\u7a0b\u5e8f\u5c06ByteBuffer\u4e2d\u7684\u5185\u5bb9\u8bfb\u53d6\u5230\u672c\u5730\u53d8\u91cf\u4e2d\uff0c\u5373\u5b8c\u6210\u6587\u4ef6\u6570\u636e\u8bfb\u53d6\u5de5\u4f5c\u3002<br \/>\n\uff082\uff09\u5199\u6587\u4ef6<br \/>\n\u3000\u3000\u7528\u6237\u7a0b\u5e8f\u901a\u8fc7\u7f16\u7a0b\u8bed\u8a00\u63d0\u4f9b\u7684\u5199\u5165\u6587\u4ef6api\u53d1\u8d77\u5bf9\u67d0\u4e2a\u6587\u4ef6\u5199\u5165\u78c1\u76d8\u3002\u6b64\u65f6\u7a0b\u5e8f\u5207\u6362\u5230\u5185\u6838\u6001\u7528\u6237\u7a0b\u5e8f\u5904\u4e8e\u963b\u585e\u72b6\u6001\uff0c\u7531OS\u8d1f\u8d23\u53d1\u8d77\u5bf9\u78c1\u76d8\u6587\u4ef6\u7684\u6570\u636e\u5199\u5165\u3002\u7528\u6237\u5199\u5165\u6570\u636e\u540e\uff0c\u5e76\u4e0d\u662f\u76f4\u63a5\u5199\u5230\u78c1\u76d8\u7684\uff0c\u800c\u662f\u5148\u5199\u5230ByteBuffer\u4e2d\uff0c\u7136\u540e\u518d\u63d0\u4ea4\u5230PageCache\u4e2d\u3002\u6700\u540e\u7531\u64cd\u4f5c\u7cfb\u7edf\u51b3\u5b9a\u4f55\u65f6\u5199\u5165\u78c1\u76d8\u3002\u6570\u636e\u5199\u5165PageCache\u4e2d\u540e\uff0c\u6b64\u65f6\u7a0b\u5e8f\u7531\u5185\u6838\u6001\u5207\u6362\u81f3\u7528\u6237\u6001\u7ee7\u7eed\u8fd0\u884c\u3002<br \/>\n\u7528\u6237\u7a0b\u5e8f\u5c06\u6570\u636e\u5199\u5165\u5185\u6838\u7684PageCache\u7f13\u51b2\u533a\u540e\uff0c\u5373\u8ba4\u4e3a\u5199\u5165\u6210\u529f\u4e86\u3002\u7a0b\u5e8f\u7531\u5185\u6838\u6001\u5207\u6362\u56de\u7528\u4e8e\u6001\uff0c\u53ef\u4ee5\u7ee7\u7eed\u540e\u7eed\u7684\u5de5\u4f5c\u4e86\u3002PageCache\u4e2d\u7684\u6570\u636e\u6700\u7ec8\u5199\u5165\u78c1\u76d8\u662f\u7531\u64cd\u4f5c\u7cfb\u7edf\u5f02\u6b65\u63d0\u4ea4\u81f3\u78c1\u76d8\u7684\u3002\u4e00\u822c\u662f\u5b9a\u65f6\u6216PageCache\u6ee1\u4e86\u7684\u65f6\u5019\u5199\u5165\u3002\u5982\u679c\u7528\u6237\u7a0b\u5e8f\u901a\u8fc7\u8c03\u7528flush\u65b9\u6cd5\u5f3a\u5236\u5199\u5165\uff0c\u5219\u64cd\u4f5c\u7cfb\u7edf\u4e5f\u4f1a\u670d\u4ece\u8fd9\u4e2a\u547d\u4ee4\u3002\u7acb\u5373\u5c06\u6570\u636e\u5199\u5165\u78c1\u76d8\u7136\u540e\u7531\u5185\u6838\u6001\u5207\u6362\u56de\u7528\u6237\u6001\u7ee7\u7eed\u8fd0\u884c\u7a0b\u5e8f\u3002\u4f46\u662f\u8fd9\u6837\u505a\u4f1a\u635f\u5931\u6027\u80fd\uff0c\u4f46\u53ef\u4ee5\u786e\u5207\u7684\u77e5\u9053\u6570\u636e\u662f\u5426\u5df2\u7ecf\u5199\u5165\u78c1\u76d8\u4e86\u3002<\/p>\n<\/li>\n<\/ul>\n<h1>\u4e8c\u3001\u6d4b\u8bd5\u786c\u76d8\u8bfb\u5199<\/h1>\n<p>\u65b9\u5f0f\u4e00\uff08\u4e86\u89e3\u5373\u53ef\uff09\uff1a\u57fa\u4e8edd\u547d\u4ee4\uff0cdd\u547d\u4ee4\u53ef\u4ee5\u901a\u7528\uff0c\u57fa\u672c\u4e0a\u00d7NIX\u7cfb\u7edf\u4e0a\u90fd\u6709\u5b89\u88c5\uff0c\u4f46\u4e0d\u591f\u4e13\u4e1a\uff0c\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\uff0c\u5e73\u65f6\u53ef\u4ee5\u4f7f\u7528\u6765\u5bf9\u78c1\u76d8\u7684\u8bfb\u5199\u901f\u5ea6\u4f5c\u4e00\u4e2a\u7b80\u5355\u7684\u8bc4\u4f30<\/p>\n<pre><code class=\"language-python\"># \u8f93\u51fa\u5230\u7a7a\/dev\/null\uff0c\u53ea\u6d4b\u8bd5\u8bfb\n[root@aliyun ~]# time dd if=\/dev\/sda of=\/dev\/null bs=8k count=10000  \n# \u6d4b\u8bd5\u6839\u5206\u533a\u78c1\u76d8\u7684\u5199\uff0c\u5199\u4e00\u4e2aa.txt\uff0c\u5982\u679c\u8981\u6d4b\u8bd5\u5b9e\u9645\u901f\u5ea6 \u8fd8\u8981\u5728\u672b\u5c3e\u52a0\u4e0a oflag=direct\u6d4b\u5230\u7684\u624d\u662f\u771f\u5b9e\u7684IO\u901f\u5ea6\n[root@aliyun ~]# time dd if=\/dev\/zero of=\/a.txt bs=8k count=10000 oflag=direct<\/code><\/pre>\n<p>\u65b9\u5f0f\u4e8c\uff08\u63a8\u8350\u4f7f\u7528\uff09\uff1afio<br \/>\nFIO\u662f\u6d4b\u8bd5IOPS\u7684\u975e\u5e38\u597d\u7684\u5de5\u5177\uff0c\u7528\u6765\u5bf9\u78c1\u76d8\u8fdb\u884c<a href=\"https:\/\/so.csdn.net\/so\/search?q=\u538b\u529b\u6d4b\u8bd5&amp;spm=1001.2101.3001.7020\">\u538b\u529b\u6d4b\u8bd5<\/a>\u548c\u9a8c\u8bc1\u3002\u78c1\u76d8IO\u662f\u68c0\u67e5\u78c1\u76d8\u6027\u80fd\u7684\u91cd\u8981\u6307\u6807\uff0c\u53ef\u4ee5\u6309\u7167\u8d1f\u8f7d\u60c5\u51b5\u5206\u6210\u7167\u987a\u5e8f\u8bfb\u5199\uff0c\u968f\u673a\u8bfb\u5199\u4e24\u5927\u7c7b\u3002FIO\u662f\u4e00\u4e2a\u53ef\u4ee5\u4ea7\u751f\u5f88\u591a\u7ebf\u7a0b\u6216\u8fdb\u7a0b\u5e76\u6267\u884c\u7528\u6237\u6307\u5b9a\u7684\u7279\u5b9a\u7c7b\u578bI\/O\u64cd\u4f5c\u7684\u5de5\u5177\uff0cFIO\u7684\u5178\u578b\u7528\u9014\u662f\u7f16\u5199\u548c\u6a21\u62df\u7684I\/O\u8d1f\u8f7d\u5339\u914d\u7684\u4f5c\u4e1a\u6587\u4ef6\u3002\u4e5f\u5c31\u662f\u8bf4FIO \u662f\u4e00\u4e2a\u591a\u7ebf\u7a0bio\u751f\u6210\u5de5\u5177\uff0c\u53ef\u4ee5\u751f\u6210\u591a\u79cdIO\u6a21\u5f0f\uff0c\u7528\u6765\u6d4b\u8bd5\u78c1\u76d8\u8bbe\u5907\u7684\u6027\u80fd\uff08\u4e5f\u5305\u542b\u6587\u4ef6\u7cfb\u7edf\uff1a\u5982\u9488\u5bf9\u7f51\u7edc\u6587\u4ef6\u7cfb\u7edf NFS \u7684IO\u6d4b\u8bd5\uff09\u3002<\/p>\n<p>\u53e6\u5916\u8fd8\u6709GFIO\u5219\u662fFIO\u7684\u56fe\u5f62\u76d1\u6d4b\u5de5\u5177\uff0c\u5b83\u63d0\u4f9b\u4e86\u56fe\u5f62\u754c\u9762\u7684\u53c2\u6570\u914d\u7f6e\uff0c\u548c\u6027\u80fd\u76d1\u6d4b\u56fe\u50cf\u3002<\/p>\n<p>fio\u5728github\u4e0a\u7684\u5750\u6807\uff1a<a href=\"https:\/\/github.com\/axboe\/fio\">https:\/\/github.com\/axboe\/fio<\/a> \u3002<br \/>\n\u5b89\u88c5<\/p>\n<pre><code class=\"language-bash\">yum install fio libaio-devel -y  #\u540e\u8005\u4e3a\u5f02\u6b65io\u5f15\u64ce\u4f9d\u8d56\u5305<\/code><\/pre>\n<p>\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u8c03\uff1a\u5343\u4e07\u4e0d\u80fd\u5728\u7cfb\u7edf\u6240\u5728\u7684\u5206\u533a\u6d4b\u8bd5\u786c\u76d8\u6027\u80fd<br \/>\n\u5f3a\u70c8\u5efa\u8bae\u4e0d\u8981\u4f7f\u7528-filename\u53c2\u6570\u6307\u5b9a\u67d0\u4e2a\u8981\u6d4b\u8bd5\u7684\u88f8\u8bbe\u5907\uff08\u786c\u76d8\u6216\u5206\u533a\uff09\uff0c\u4f8b\u5982\uff0c\u4f60\u6307\u5b9a\u4e86-filename=\/dev\/sda\uff0c\u800c\/dev\/sda\u662f\u7cfb\u7edf\u7684\u6839\u5206\u533a\u6240\u5728\uff0c\u5728\u4f60\u6d4b\u8bd5\u8bfb\u65f6\u6ca1\u95ee\u9898\uff0c\u4f46\u662f\u4f60\u6d4b\u8bd5write\u64cd\u4f5c\u65f6\uff0c\u4f1a\u5199\u5165\u6570\u636e\u5230\/dev\/sda\u91cc\uff0c\u8fd9\u4f1a\u7834\u574f\u7cfb\u7edf\u5206\u533a\uff0c\u800c\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83\u3002<\/p>\n<pre><code>fio -name=mytest -direct=1 -rw=read -bs=4k -size=5G -ioengine=libaio -iodepth=64 -thread -numjob=1 -filename=\/dev\/sda -runtime=60<\/code><\/pre>\n<p>\u82e5\u4e00\u5b9a\u8981\u6d4b\u8bd5\u7cfb\u7edf\u5206\u533a\u8f83\u4e3a\u5b89\u5168\u7684\u65b9\u6cd5\u662f\uff1a\u5728\u6839\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2a\u7a7a\u76ee\u5f55\uff0c\u5728\u6d4b\u8bd5\u547d\u4ee4\u4e2d\u4f7f\u7528directory\u53c2\u6570\u6307\u5b9a\u8be5\u76ee\u5f55\uff0c\u800c\u4e0d\u4f7f\u7528-filename\u53c2\u6570\u3002<\/p>\n<pre><code>cd \/ # \u5207\u5230\u6839\u5206\u533a\u4e0b\uff0c\u521b\u5efa\u76ee\u5f55\u6765\u6d4b\u8bd5\nmkdir test\/\n\u00a0fio -directory=\/test\/ \u2026\u2026\n\n\u53c2\u6570\u8bf4\u660e\n-name=mytest \u6307\u5b9a\u672c\u6b21\u6d4b\u8bd5\u4efb\u52a1\u540d\uff0c\u81ea\u5b9a\u4e49\u5373\u53ef\n-filename: \u6307\u5b9a\u6587\u4ef6(\u8bbe\u5907)\u7684\u540d\u79f0\u3002\u53ef\u4ee5\u901a\u8fc7\u5192\u53f7\u5206\u5272\u540c\u65f6\u6307\u5b9a\u591a\u4e2a\u6587\u4ef6\uff0c\u5982filename=\/dev\/sda:\/dev\/sdb\u3002\n-directory: \u8bbe\u7f6efilename\u7684\u8def\u5f84\u524d\u7f00\u3002\u5728\u540e\u9762\u7684\u57fa\u51c6\u6d4b\u8bd5\u4e2d\uff0c\u91c7\u7528\u8fd9\u79cd\u65b9\u5f0f\u6765\u6307\u5b9a\u8bbe\u5907\u3002\n\n-direct: bool\u7c7b\u578b\uff0c\u5982\u679c\u8bbe\u7f6e\u6210true\u62161\uff0c\u8868\u793a\u4e0d\u4f7f\u7528io buffer\uff0c\u4ee3\u8868\u4ece\u5185\u5b58\u76f4\u63a5\u5199\u5165\u78c1\u76d8\uff0c\u6d4b\u8bd5\u8fc7\u7a0b\u7ed5\u8fc7OS\u81ea\u5e26\u7684buffer\uff0c\u4f7f\u6d4b\u8bd5\u78c1\u76d8\u7684\u7ed3\u679c\u66f4\u771f\u5b9e\uff0c\u5373\u91c7\u7528O_DIECT\u7684\u65b9\u5f0f\uff0c\u89c4\u907fbuffer\u5199\u7f13\u51b2\u533a\u5e26\u6765\u7684\u5f71\u54cd\uff08\u5b9e\u9645\u6d4b\u8bd5\u7684\u65f6\u5019\u53d1\u73b0\u5373\u4fbf\u8bbe\u7f6e-direct=1\u4e5f\u4f1a\u4f7f\u4f7f\u7528buffer\uff0c\u4f46\u786e\u5b9e\u8bbe\u7f6e\u4e3a1\u4e0e\u8bbe\u7f6e\u4e3a0\u7684\u5199\u901f\u5ea6\uff0c\u524d\u8005\u66f4\u5feb\uff0c\u96be\u9053\u662f\u8bbe\u7f6edirect=1\u4e4b\u540e\u4f1a\u5199\u5165buffer\u7136\u540e\u7acb\u5373\u5237\u5165\u78c1\u76d8\u4ee5\u6b64\u6765\u6a21\u62dfO_DIECT\u7684\u65b9\u5f0f\uff1f\u8fd9\u4e2a\u6709\u5f85\u8fdb\u4e00\u6b65\u7814\u7a76\uff09\n\n-rw=read \u6d4b\u8bd5\u987a\u5e8f\u8bfb\u00a0\n-rw=randread \u6d4b\u8bd5\u968f\u673a\u8bfb \n-rw=write \u6d4b\u8bd5\u987a\u5e8f\u5199\n-rw=randwrite \u6d4b\u8bd5\u968f\u673a\u5199 \n-rw=randrw \u6d4b\u8bd5\u6df7\u5408\u968f\u673a\u8bfb\u5199\u6a21\u5f0f\u00a0\n\n-ioengine: I\/O\u5f15\u64ce\uff0c\u73b0\u5728fio\u652f\u630119\u79cdioengine\uff08sync\uff0cmmap\uff0clibaio\uff0cposixaio\uff0cSG v3\uff0csplice\uff0cnull\uff0cnetwork\uff0csyslet\uff0cguasi\uff0csolarisaio\u7b49\uff09\u3002\u9ed8\u8ba4\u503c\u662fsync\u540c\u6b65\u963b\u585eI\/O\uff0clibaio\u4ee3\u8868\u5f02\u6b65\u8bfb\u53d6\uff0c\u63d0\u4ea4\u5b8cio\u8bf7\u6c42\u540e\u53ef\u4ee5\u7ee7\u7eed\u63d0\u4ea4\u4e0b\u4e00\u4e2a\niodepth=16  \u5219\u4ee3\u8868\u603b\u5171\u63d0\u4ea4\u4e86\u591a\u5c11\u4e2aio\u8bf7\u6c42\uff0c\u7ed3\u5408\u4e0a\u4e00\u4e2a\u53c2\u6570\u7684\u5f02\u6b65\u63d0\u4ea4\uff0c\u6b64\u5904\u7684io\u63d0\u4ea4\u662f\u63d0\u4ea4\u5b8c\u4e00\u4e2a\u7acb\u5373\u63d0\u4ea4\u4e0b\u4e00\u4e2a\n\n-bs=4k -size=5G \u4ee3\u8868\u5355\u6b21IO\u5757\u5927\u5c0f\u4e3a4k\uff0c\u603b\u5171\u8bfb\u53d65G\u6570\u636e\n\n-thread=1  \u4ee3\u8868\u4f7f\u7528pthread_create\u521b\u5efa\u7ebf\u7a0b\uff0c\u53e6\u4e00\u79cd\u662f\u4f7f\u7528fork\u521b\u5efa\u8fdb\u7a0b\u3002\u8fdb\u7a0b\u7684\u5f00\u9500\u6bd4\u7ebf\u7a0b\u8981\u5927\uff0c\u4e00\u822c\u90fd\u91c7\u7528thread\u6d4b\u8bd5\u3002\n-numjob=1 \u4ee3\u8868\u542f\u52a8\u4e00\u4e2a\u4efb\u52a1\u6765\u6267\u884c\u4e0a\u8ff0\u7684IO\u6d4b\u8bd5\uff0c\u4e00\u4e2a\u4efb\u52a1\u4ee3\u8868\u4e00\u4e2a\u7ebf\u7a0b\n\n-runtime=60 \u4ee3\u8868\u6d4b\u8bd5\u591a\u957f\u65f6\u95f4\uff0c\u6d4b\u8bd5\u65f6\u95f4\u4e3a60\u79d2\uff0c\u5982\u679c\u4e0d\u5199\u5219\u4e00\u76f4\u5c065g\u6587\u4ef6\u52064k\u6bcf\u6b21\u5199\u5b8c\u4e3a\u6b62\u3002\n\ngroup_reporting: \u5f53\u540c\u65f6\u6307\u5b9a\u4e86numjobs\u4e86\u65f6\uff0c\u8f93\u51fa\u7ed3\u679c\u6309\u7ec4\u663e\u793a\uff0c\u6c47\u603b\u6bcf\u4e2a\u8fdb\u7a0b\u7684\u4fe1\u606f\u3002\n\nbsrange=512-2048    \u540c\u4e0a-bs=4k\u7c7b\u4f3c\uff0c\u6b64\u5904\u4e3a\u6307\u5b9a\u6570\u636e\u5757\u7684\u5927\u5c0f\u8303\u56f4\n\nBlock Devices\uff08RBD\uff09 \u65e0\u9700\u4f7f\u7528\u5185\u6838RBD\u9a71\u52a8\u7a0b\u5e8f\uff08rbd.ko\uff09\u3002\u8be5\u53c2\u6570\u5305\u542b\u5f88\u591aioengine\uff0c\u5982\uff1alibhdfs\/rdma\u7b49\nrwmixwrite=30       \u5728\u6df7\u5408\u8bfb\u5199\u7684\u6a21\u5f0f\u4e0b\uff0c\u5199\u536030%\n\u6b64\u5916\nlockmem=1g          \u53ea\u4f7f\u75281g\u5185\u5b58\u8fdb\u884c\u6d4b\u8bd5\u3002\nzero_buffers        \u75280\u521d\u59cb\u5316\u7cfb\u7edfbuffer\u3002\nnrfiles=8           \u6bcf\u4e2a\u8fdb\u7a0b\u751f\u6210\u6587\u4ef6\u7684\u6570\u91cf\u3002<\/code><\/pre>\n<p>\u78c1\u76d8\u8bfb\u5199\u5e38\u7528\u6d4b\u8bd5\u70b9\uff0c\u9700\u8981\u50a8\u5907\u77e5\u8bc6\uff1a\u987a\u5e8fIO\u4e0e\u968f\u5373IO\uff1a<a href=\"https:\/\/egonlin.com\/?p=7230\">https:\/\/egonlin.com\/?p=7230<\/a><\/p>\n<pre><code class=\"language-bash\">1. Read=100%  Ramdon=100%   rw=randread   (100%\u968f\u673a\u8bfb)\n2. Read=100%  Sequence=100% rw=read      \uff08100%\u987a\u5e8f\u8bfb\uff09\n3. Write=100% Sequence=100% rw=write     \uff08100%\u987a\u5e8f\u5199\uff09\n4. Write=100% Ramdon=100%   rw=randwrite \uff08100%\u968f\u673a\u5199\uff09\n5. Read=70%   Sequence=100% rw=rw, rwmixread=70, rwmixwrite=30\n\uff0870%\u987a\u5e8f\u8bfb\uff0c30%\u987a\u5e8f\u5199\uff09\n6. Read=70%   Ramdon=100% rw=randrw, rwmixread=70, rwmixwrite=30\n(70%\u968f\u673a\u8bfb\uff0c30%\u968f\u673a\u5199)\n\n\u793a\u4f8b\n100%\u968f\u673a\uff0c100%\u8bfb\uff0c 4K\nfio -filename=\/dev\/emcpowerb -direct=1 -iodepth 1 -thread -rw=randread -ioengine=psync -bs=4k -size=1000G -numjobs=50 -runtime=180 -group_reporting -name=rand_100read_4k\n\n100%\u968f\u673a\uff0c100%\u5199\uff0c 4K\nfio -filename=\/dev\/emcpowerb -direct=1 -iodepth 1 -thread -rw=randwrite -ioengine=psync -bs=4k -size=1000G -numjobs=50 -runtime=180 -group_reporting -name=rand_100write_4k\n\n100%\u987a\u5e8f\uff0c100%\u8bfb \uff0c4K\nfio -filename=\/dev\/emcpowerb -direct=1 -iodepth 1 -thread -rw=read -ioengine=psync -bs=4k -size=1000G -numjobs=50 -runtime=180 -group_reporting -name=sqe_100read_4k\n\n100%\u987a\u5e8f\uff0c100%\u5199 \uff0c4K\nfio -filename=\/dev\/emcpowerb -direct=1 -iodepth 1 -thread -rw=write -ioengine=psync -bs=4k -size=1000G -numjobs=50 -runtime=180 -group_reporting -name=sqe_100write_4k\n\n100%\u968f\u673a\uff0c70%\u8bfb\uff0c30%\u5199 4K\nfio -filename=\/dev\/emcpowerb -direct=1 -iodepth 1 -thread -rw=randrw -rwmixread=70 -ioengine=psync -bs=4k -size=1000G -numjobs=50 -runtime=180 -group_reporting -name=randrw_70read_4k<\/code><\/pre>\n<p>FIO\u6d4b\u8bd5\u5b9e\u4f8b\uff1a\u6d4b\u8bd5\u8bfb<\/p>\n<pre><code class=\"language-bash\">[root@docker sda]# fio -ioengine=libaio -bs=4k -direct=1 -thread -numjobs=1 -rw=read -filename=\/dev\/sda -name=&quot;BS 4KB read test&quot; -iodepth=16 -runtime=60\nBS 4KB read test: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=16\nfio-3.7\nStarting 1 thread\nJobs: 1 (f=1): [R(1)][100.0%][r=89.3MiB\/s,w=0KiB\/s][r=22.9k,w=0 IOPS][eta 00m:00s]\nBS 4KB read test: (groupid=0, jobs=1): err= 0: pid=18557: Thu Apr 11 13:08:11 2019\n   read: IOPS=22.7k, BW=88.5MiB\/s (92.8MB\/s)(5313MiB\/60001msec) # IOPS\uff1a\u6bcf\u79d2\u7684io\u6b21\u6570\uff0c\u8d8a\u5927\u6027\u80fd\u8d8a\u597d\u3002BW\uff1abandwidth\u5373\u5e26\u5bbd\uff0c\u59b9\u59b9\n\n    slat (nsec): min=901, max=168330, avg=6932.34, stdev=1348.82 #\u63d0\u4ea4\u5ef6\u8fdf\n    clat (usec): min=90, max=63760, avg=698.08, stdev=240.83 #\u5b8c\u6210\u5ef6\u8fdf\n     lat (usec): min=97, max=63762, avg=705.17, stdev=240.81 #\u54cd\u5e94\u65f6\u95f4\n    clat percentiles (usec):\n     |  1.00th=[  619],  5.00th=[  627], 10.00th=[  627], 20.00th=[  635],\n     | 30.00th=[  635], 40.00th=[  685], 50.00th=[  717], 60.00th=[  725],\n     | 70.00th=[  725], 80.00th=[  725], 90.00th=[  734], 95.00th=[  816],\n     | 99.00th=[ 1004], 99.50th=[ 1020], 99.90th=[ 1057], 99.95th=[ 1057],\n     | 99.99th=[ 1860]\n   bw (  KiB\/s): min=62144, max=91552, per=100.00%, avg=90669.02, stdev=3533.77, samples=120\n   iops        : min=15536, max=22888, avg=22667.27, stdev=883.44, samples=120\n  lat (usec)   : 100=0.01%, 250=0.01%, 500=0.01%, 750=93.85%, 1000=5.14%\n  lat (msec)   : 2=0.99%, 4=0.01%, 10=0.01%, 50=0.01%, 100=0.01%\n  cpu          : usr=5.35%, sys=23.17%, ctx=1359692, majf=0, minf=17\n  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%, &gt;=64=0.0%\n     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, &gt;=64=0.0% #\u5355\u4e2aIO\u63d0\u4ea4\u8981\u63d0\u4ea4\u7684IO\u6570\n     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%, &gt;=64=0.0%\n     issued rwts: total=1360097,0,0,0 short=0,0,0,0 dropped=0,0,0,0\n     latency   : target=0, window=0, percentile=100.00%, depth=16  #IO\u5b8c\u5ef6\u8fdf\u7684\u5206\u5e03\n\nRun status group 0 (all jobs):\n   READ: bw=88.5MiB\/s (92.8MB\/s), 88.5MiB\/s-88.5MiB\/s (92.8MB\/s-92.8MB\/s)\u8303\u56f4, io=5313MiB (5571MB), run=60001-60001msec\n\nDisk stats (read\/write):\n  sda: ios=1357472\/0(\u6240\u6709group\u603b\u5171\u6267\u884c\u7684IO\u6570), merge=70\/0(\u603b\u5171\u53d1\u751f\u7684IO\u5408\u5e76\u6570), ticks=949141\/0(Number of ticks we kept the disk busy), in_queue=948776(\u82b1\u8d39\u5728\u961f\u5217\u4e0a\u7684\u603b\u5171\u65f6\u95f4), util=99.88%(\u78c1\u76d8\u5229\u7528\u7387)<\/code><\/pre>\n<p>FIO\u5b9e\u4f8b\uff1a\u6d4b\u8bd5\u5199<\/p>\n<pre><code>mkdir \/test\nfio -directory=\/test -direct=0 -iodepth 1 -thread -rw=write -iodepth=64 -ioengine=psync -bs=16k -size=5G -numjobs=30 -runtime=60 -group_reporting -name=mytest<\/code><\/pre>\n<p>\u5176\u4ed6\u6307\u6807<\/p>\n<pre><code>io=\u6267\u884c\u4e86\u591a\u5c11M\u7684IO\nbw=\u5e73\u5747IO\u5e26\u5bbd\niops=IOPS\nrunt=\u7ebf\u7a0b\u8fd0\u884c\u65f6\u95f4\nslat=\u63d0\u4ea4\u5ef6\u8fdf\uff0c\u63d0\u4ea4\u8be5IO\u8bf7\u6c42\u5230kernel\u6240\u82b1\u7684\u65f6\u95f4\uff08\u4e0d\u5305\u62eckernel\u5904\u7406\u7684\u65f6\u95f4\uff09\nclat=\u5b8c\u6210\u5ef6\u8fdf, \u63d0\u4ea4\u8be5IO\u8bf7\u6c42\u5230kernel\u540e\uff0c\u5904\u7406\u6240\u82b1\u7684\u65f6\u95f4\nlat=\u54cd\u5e94\u65f6\u95f4\nbw=\u5e26\u5bbd\ncpu=\u5229\u7528\u7387\nIO depths=io\u961f\u5217\nIO submit=\u5355\u4e2aIO\u63d0\u4ea4\u8981\u63d0\u4ea4\u7684IO\u6570\nIO complete=Like the above submit number, but for completions instead.\nIO issued=The number of read\/write requests issued, and how many of them were short.\nIO latencies=IO\u5b8c\u5ef6\u8fdf\u7684\u5206\u5e03\nio=\u603b\u5171\u6267\u884c\u4e86\u591a\u5c11size\u7684IO\naggrb=group\u603b\u5e26\u5bbd\nminb=\u6700\u5c0f.\u5e73\u5747\u5e26\u5bbd.\nmaxb=\u6700\u5927\u5e73\u5747\u5e26\u5bbd.\nmint=group\u4e2d\u7ebf\u7a0b\u7684\u6700\u77ed\u8fd0\u884c\u65f6\u95f4.\nmaxt=group\u4e2d\u7ebf\u7a0b\u7684\u6700\u957f\u8fd0\u884c\u65f6\u95f4.\nios=\u6240\u6709group\u603b\u5171\u6267\u884c\u7684IO\u6570.\nmerge=\u603b\u5171\u53d1\u751f\u7684IO\u5408\u5e76\u6570.\nticks=Number of ticks we kept the disk busy.\nio_queue=\u82b1\u8d39\u5728\u961f\u5217\u4e0a\u7684\u603b\u5171\u65f6\u95f4.\nutil=\u78c1\u76d8\u5229\u7528\u7387<\/code><\/pre>\n<p>\u5176\u4ed6\u6d4b\u8bd5\u78c1\u76d8IO\u7684\u65b9\u5f0f\u53ef\u4ee5\u81ea\u884c\u4e86\u89e3\uff0c\u5982hdparm<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00 \u50a8\u5907\u77e5\u8bc6 1\u3001\u78c1\u76d8\u7684\u7ed3\u6784 2\u3001MB\u548cMIB\u7684\u533a\u522b MB\u7b49\u5355\u4f4d\u4ee510\u4e3a\u5e95\u6570\u7684\u6307\u6570\u3002 MiB\u662f\u4ee52\u4e3a\u5e95\u6570\u7684\u6307\u6570 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6201,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[34],"tags":[21,19,35,22,20],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/250"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=250"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/250\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/6201"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=250"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=250"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=250"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}