{"id":80456,"date":"2026-03-05T07:17:34","date_gmt":"2026-03-04T23:17:34","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/80456.html"},"modified":"2026-03-05T07:17:34","modified_gmt":"2026-03-04T23:17:34","slug":"%e7%a3%81%e7%9b%98%e8%b0%83%e5%ba%a6%e7%ae%97%e6%b3%95%e5%ae%9e%e6%88%98%ef%bc%9a%e4%bb%8efcfs%e5%88%b0c-look%ef%bc%8c%e5%93%aa%e7%a7%8d%e6%9c%80%e9%80%82%e5%90%88%e4%bd%a0%e7%9a%84%e6%9c%8d%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/80456.html","title":{"rendered":"\u78c1\u76d8\u8c03\u5ea6\u7b97\u6cd5\u5b9e\u6218\uff1a\u4eceFCFS\u5230C-LOOK\uff0c\u54ea\u79cd\u6700\u9002\u5408\u4f60\u7684\u670d\u52a1\u5668\uff1f"},"content":{"rendered":"

\u78c1\u76d8\u8c03\u5ea6\u7b97\u6cd5\u5b9e\u6218：\u4eceFCFS\u5230C-LOOK，\u54ea\u79cd\u6700\u9002\u5408\u4f60\u7684\u670d\u52a1\u5668？<\/h2>\n

\u6df1\u591c，\u76d1\u63a7\u9762\u677f\u4e0a\u78c1\u76d8I\/O\u7b49\u5f85\u961f\u5217\u7684\u66f2\u7ebf\u7a81\u7136\u98d9\u5347，\u5e94\u7528\u54cd\u5e94\u65f6\u95f4\u5f00\u59cb\u53d8\u5f97\u98d8\u5ffd\u4e0d\u5b9a\u3002\u4f5c\u4e3a\u670d\u52a1\u5668\u7ba1\u7406\u5458，\u4f60\u7b2c\u4e00\u65f6\u95f4\u60f3\u5230\u7684\u53ef\u80fd\u662f\u589e\u52a0\u5185\u5b58\u3001\u5347\u7ea7CPU，\u6216\u662f\u4f18\u5316\u6570\u636e\u5e93\u7d22\u5f15\u3002\u4f46\u4f60\u662f\u5426\u66fe\u5c06\u76ee\u5149\u6295\u5411\u64cd\u4f5c\u7cfb\u7edf\u5e95\u5c42，\u90a3\u4e2a\u9ed8\u9ed8\u65e0\u95fb\u5374\u81f3\u5173\u91cd\u8981\u7684\u201c\u4ea4\u901a\u6307\u6325\u5b98\u201d\u2014\u2014\u78c1\u76d8\u8c03\u5ea6\u7b97\u6cd5？\u5b83\u51b3\u5b9a\u4e86\u78c1\u5934\u5982\u4f55\u5728\u76d8\u7247\u4e0a\u6765\u56de\u79fb\u52a8，\u5904\u7406\u6d77\u91cf\u7684\u8bfb\u5199\u8bf7\u6c42\u3002\u9009\u5bf9\u4e86，I\/O\u74f6\u9888\u53ef\u80fd\u8fce\u5203\u800c\u89e3；\u9009\u9519\u4e86，\u518d\u5f3a\u608d\u7684\u786c\u4ef6\u4e5f\u53ef\u80fd\u5728\u65e0\u8c13\u7684\u5bfb\u9053\u4e2d\u7a7a\u8f6c\u3002\u4eca\u5929，\u6211\u4eec\u4e0d\u8c08\u67af\u71e5\u7684\u7406\u8bba，\u800c\u662f\u4ece\u771f\u5b9e\u7684\u670d\u52a1\u5668\u8d1f\u8f7d\u573a\u666f\u51fa\u53d1，\u4eb2\u624b\u62c6\u89e3\u4ece\u7ecf\u5178\u7684FCFS\u5230\u9ad8\u6548\u7684C-LOOK，\u770b\u770b\u5b83\u4eec\u5728\u5b9e\u9645\u6218\u573a\u4e0a\u7684\u8868\u73b0\u7a76\u7adf\u5982\u4f55\u3002<\/p>\n

1. \u7406\u89e3\u78c1\u76d8I\/O：\u6027\u80fd\u74f6\u9888\u7684\u6839\u6e90\u4e0e\u5ea6\u91cf<\/h3>\n

\u5728\u6df1\u5165\u7b97\u6cd5\u4e4b\u524d，\u6211\u4eec\u5fc5\u987b\u5148\u641e\u6e05\u695a\u6211\u4eec\u8bd5\u56fe\u4f18\u5316\u4ec0\u4e48\u3002\u4e00\u6b21\u78c1\u76d8I\/O\u64cd\u4f5c，\u8fdc\u975e\u7b80\u5355\u7684\u6570\u636e\u5b58\u53d6，\u5b83\u662f\u4e00\u573a\u7531\u591a\u4e2a\u7cbe\u5bc6\u73af\u8282\u4e32\u8054\u8d77\u6765\u7684\u63a5\u529b\u8d5b\u3002\u5176\u603b\u8017\u65f6\u4e3b\u8981\u5305\u542b\u4e09\u4e2a\u90e8\u5206：<\/p>\n

  • \u5bfb\u9053\u65f6\u95f4：\u8fd9\u662f\u78c1\u76d8\u81c2\u5c06\u78c1\u5934\u79fb\u52a8\u5230\u76ee\u6807\u78c1\u9053\u6240\u82b1\u8d39\u7684\u65f6\u95f4\u3002\u5b83\u662f\u673a\u68b0\u8fd0\u52a8，\u901f\u5ea6\u6700\u6162，\u901a\u5e38\u662fI\/O\u5ef6\u8fdf\u7684\u4e3b\u8981\u8d21\u732e\u8005，\u4e5f\u662f\u6240\u6709\u78c1\u76d8\u8c03\u5ea6\u7b97\u6cd5\u91cd\u70b9\u4f18\u5316\u7684\u5bf9\u8c61\u3002<\/li>\n
  • \u65cb\u8f6c\u5ef6\u8fdf：\u78c1\u5934\u5230\u8fbe\u6b63\u786e\u78c1\u9053\u540e，\u9700\u8981\u7b49\u5f85\u76ee\u6807\u6247\u533a\u65cb\u8f6c\u5230\u78c1\u5934\u4e0b\u65b9\u3002\u8fd9\u53d6\u51b3\u4e8e\u78c1\u76d8\u8f6c\u901f，\u5bf9\u4e8e\u4e00\u4e2a7200 RPM\u7684\u78c1\u76d8，\u5e73\u5747\u65cb\u8f6c\u5ef6\u8fdf\u7ea6\u4e3a4.17\u6beb\u79d2\u3002<\/li>\n
  • \u4f20\u8f93\u65f6\u95f4：\u5b9e\u9645\u4ece\u78c1\u76d8\u8868\u9762\u8bfb\u53d6\u6216\u5199\u5165\u6570\u636e\u7684\u65f6\u95f4\u3002\u8fd9\u4e2a\u65f6\u95f4\u901a\u5e38\u5f88\u77ed，\u53d6\u51b3\u4e8e\u6570\u636e\u5757\u5927\u5c0f\u548c\u78c1\u76d8\u7684\u5185\u90e8\u4f20\u8f93\u901f\u7387\u3002<\/li>\n

    \u7528\u4e00\u4e2a\u7b80\u5355\u7684\u516c\u5f0f\u6765\u6982\u62ec：
    \n\u603bI\/O\u65f6\u95f4 \u2248 \u5bfb\u9053\u65f6\u95f4 + \u65cb\u8f6c\u5ef6\u8fdf + \u4f20\u8f93\u65f6\u95f4<\/p>\n

    \u800c\u5728\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u73af\u5883\u4e2d，\u5f53\u5927\u91cfI\/O\u8bf7\u6c42\u6d8c\u5165\u65f6，\u5b83\u4eec\u4f1a\u5728\u64cd\u4f5c\u7cfb\u7edf\u7684I\/O\u8c03\u5ea6\u961f\u5217\u4e2d\u6392\u961f\u3002\u6b64\u65f6，\u5e73\u5747\u5bfb\u9053\u65f6\u95f4\u548cI\/O\u541e\u5410\u91cf\u5c31\u6210\u4e86\u8861\u91cf\u8c03\u5ea6\u7b97\u6cd5\u4f18\u52a3\u7684\u4e24\u4e2a\u6838\u5fc3\u6307\u6807\u3002\u524d\u8005\u76f4\u63a5\u5f71\u54cd\u6bcf\u4e2a\u8bf7\u6c42\u7684\u54cd\u5e94\u5ef6\u8fdf，\u540e\u8005\u5219\u51b3\u5b9a\u4e86\u7cfb\u7edf\u5728\u5355\u4f4d\u65f6\u95f4\u5185\u80fd\u5904\u7406\u591a\u5c11\u8bf7\u6c42\u3002<\/p>\n

    \u4e3a\u4e86\u66f4\u76f4\u89c2\u5730\u5bf9\u6bd4\u4e0d\u540c\u7b97\u6cd5\u5728\u4e0d\u540c\u8d1f\u8f7d\u4e0b\u7684\u7406\u8bba\u8868\u73b0，\u6211\u4eec\u53ef\u4ee5\u5148\u770b\u4e0b\u9762\u8fd9\u4e2a\u7b80\u5316\u7684\u7279\u6027\u5bf9\u7167\u8868：<\/p>\n\n\u7b97\u6cd5\u540d\u79f0\u6838\u5fc3\u7b56\u7565\u4f18\u70b9\u6f5c\u5728\u7f3a\u70b9\u9002\u7528\u8d1f\u8f7d\u7279\u5f81<\/tr>\n\n\n\n\n\n\n\n
    FCFS<\/td>\n\u5148\u6765\u5148\u670d\u52a1<\/td>\n\u7edd\u5bf9\u516c\u5e73，\u5b9e\u73b0\u7b80\u5355<\/td>\n\u5bfb\u9053\u6027\u80fd\u53ef\u80fd\u6781\u5dee<\/td>\n\u8bf7\u6c42\u975e\u5e38\u7a00\u758f\u6216\u987a\u5e8f\u8bbf\u95ee<\/td>\n<\/tr>\n
    SSTF<\/td>\n\u6700\u77ed\u5bfb\u9053\u4f18\u5148<\/td>\n\u5e73\u5747\u5bfb\u9053\u65f6\u95f4\u77ed<\/td>\n\u53ef\u80fd\u4ea7\u751f\u201c\u9965\u997f\u201d\u73b0\u8c61<\/td>\n\u8bf7\u6c42\u5206\u5e03\u76f8\u5bf9\u5747\u5300<\/td>\n<\/tr>\n
    SCAN<\/td>\n\u7535\u68af\u626b\u63cf<\/td>\n\u517c\u987e\u516c\u5e73\u4e0e\u541e\u5410\u91cf<\/td>\n\u4e24\u7aef\u8bf7\u6c42\u54cd\u5e94\u65f6\u95f4\u4e0d\u5747<\/td>\n\u8d1f\u8f7d\u8f83\u91cd\u4e14\u5206\u5e03\u5e7f\u6cdb<\/td>\n<\/tr>\n
    LOOK<\/td>\n\u6539\u8fdb\u626b\u63cf<\/td>\n\u6bd4SCAN\u66f4\u7075\u6d3b<\/td>\n\u4ecd\u9700\u6765\u56de\u626b\u63cf<\/td>\n\u8d1f\u8f7d\u8f83\u91cd，\u52a8\u6001\u6027\u5f3a<\/td>\n<\/tr>\n
    C-SCAN<\/td>\n\u5faa\u73af\u626b\u63cf<\/td>\n\u54cd\u5e94\u65f6\u95f4\u66f4\u5747\u5300<\/td>\n\u7a7a\u626b\u8fd4\u56de\u9020\u6210\u6d6a\u8d39<\/td>\n\u5bf9\u54cd\u5e94\u65f6\u95f4\u4e00\u81f4\u6027\u8981\u6c42\u9ad8<\/td>\n<\/tr>\n
    C-LOOK<\/td>\n\u5faa\u73af\u67e5\u770b<\/td>\n\u9ad8\u6548\u4e14\u516c\u5e73\u6027\u8f83\u597d<\/td>\n\u5b9e\u73b0\u7a0d\u590d\u6742<\/td>\n\u73b0\u4ee3\u901a\u7528\u670d\u52a1\u5668\u7684\u4e3b\u6d41\u9009\u62e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u63d0\u793a：\u8fd9\u5f20\u8868\u53ea\u662f\u4e00\u4e2a\u7406\u8bba\u4e0a\u7684\u901f\u89c8\u3002\u7b97\u6cd5\u7684\u771f\u5b9e\u8868\u73b0\u9ad8\u5ea6\u4f9d\u8d56\u4e8e\u4f60\u7684\u5177\u4f53\u5de5\u4f5c\u8d1f\u8f7d\u6a21\u5f0f\u2014\u2014\u662f\u5927\u91cf\u968f\u673a\u5c0f\u6587\u4ef6\u8bfb\u5199，\u8fd8\u662f\u987a\u5e8f\u7684\u5927\u6587\u4ef6\u6d41？\u63a5\u4e0b\u6765，\u6211\u4eec\u5c06\u8fdb\u5165\u5b9e\u6218\u73af\u8282\u3002<\/p>\n

    2. \u7ecf\u5178\u7b97\u6cd5\u5b9e\u6218\u5256\u6790：\u4eceFCFS\u5230SCAN\u7684\u4f18\u7f3a\u70b9\u5b9e\u6d4b<\/h3>\n

    \u8ba9\u6211\u4eec\u642d\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u6d4b\u8bd5\u73af\u5883\u6765\u611f\u53d7\u4e00\u4e0b\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u78c1\u9053\u53f7\u8303\u56f4\u4e3a0-199\u7684\u78c1\u76d8，\u5f53\u524d\u78c1\u5934\u4f4d\u4e8e53\u53f7\u78c1\u9053\u3002\u6b64\u65f6I\/O\u8bf7\u6c42\u961f\u5217\u5982\u4e0b：[98, 183, 37, 122, 14, 124, 65, 67]\u3002\u6211\u4eec\u5c06\u7528\u4e0d\u540c\u7684\u7b97\u6cd5\u6765\u201c\u6267\u884c\u201d\u8fd9\u4e9b\u8bf7\u6c42，\u5e76\u8ba1\u7b97\u603b\u5bfb\u9053\u8ddd\u79bb\u3002<\/p>\n

    2.1 FCFS：\u7b80\u5355\u7c97\u66b4\u7684\u201c\u8001\u5b9e\u4eba\u201d<\/h4>\n

    FCFS\u7b97\u6cd5\u5c31\u50cf\u94f6\u884c\u7684\u4e00\u4e2a\u670d\u52a1\u7a97\u53e3，\u4e25\u683c\u6309\u7167\u8bf7\u6c42\u5230\u8fbe\u7684\u987a\u5e8f\u5904\u7406\u3002\u5bf9\u4e8e\u6211\u4eec\u7684\u961f\u5217，\u78c1\u5934\u79fb\u52a8\u8f68\u8ff9\u5c06\u662f：
    \n53 -> 98 -> 183 -> 37 -> 122 -> 14 -> 124 -> 65 -> 67<\/p>\n

    \u6211\u4eec\u6765\u8ba1\u7b97\u4e00\u4e0b：<\/p>\n

    \u79fb\u52a8\u8ddd\u79bb： |53-98|=45, |98-183|=85, |183-37|=146, |37-122|=85, |122-14|=108, |14-124|=110, |124-65|=59, |65-67|=2
    \n\u603b\u5bfb\u9053\u8ddd\u79bb = 45+85+146+85+108+110+59+2 = 640<\/p>\n

    640\u4e2a\u78c1\u9053\u7684\u603b\u79fb\u52a8\u8ddd\u79bb！ \u6027\u80fd\u663e\u7136\u4e0d\u7406\u60f3\u3002FCFS\u5728\u8d1f\u8f7d\u8f83\u8f7b\u3001\u8bf7\u6c42\u672c\u8eab\u63a5\u8fd1\u987a\u5e8f\u65f6\u6ca1\u95ee\u9898，\u4f46\u5728\u9ad8\u5e76\u53d1\u968f\u673a\u8bf7\u6c42\u4e0b，\u78c1\u5934\u4f1a\u50cf\u65e0\u5934\u82cd\u8747\u4e00\u6837\u5728\u76d8\u7247\u4e0a\u201c\u957f\u9014\u5954\u88ad\u201d，\u5bfc\u81f4\u6781\u957f\u7684\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\u3002\u5b83\u7684\u4f18\u52bf\u4ec5\u5728\u4e8e\u7edd\u5bf9\u7684\u516c\u5e73\u6027\u548c\u96f6\u5f00\u9500，\u4f46\u5728\u8ffd\u6c42\u6027\u80fd\u7684\u670d\u52a1\u5668\u4e0a，\u901a\u5e38\u4e0d\u4f5c\u4e3a\u9996\u9009\u3002<\/p>\n

    2.2 SSTF：\u6027\u80fd\u4f18\u5148\u7684\u201c\u673a\u4f1a\u4e3b\u4e49\u8005\u201d<\/h4>\n

    SSTF\u7b97\u6cd5\u5219\u975e\u5e38\u201c\u806a\u660e\u201d，\u5b83\u603b\u662f\u9009\u62e9\u5f53\u524d\u78c1\u5934\u4f4d\u7f6e\u6700\u8fd1\u7684\u8bf7\u6c42\u6765\u670d\u52a1\u3002\u4ece53\u5f00\u59cb：<\/p>\n

      \n
    • \u6700\u8fd1\u7684\u662f 65 (\u8ddd\u79bb12)，\u7136\u540e\u662f 67 (\u8ddd\u79bb2)，\u63a5\u7740\u662f 37 (\u8ddd\u79bb30)，14 (\u8ddd\u79bb23)，98 (\u8ddd\u79bb84)，122 (\u8ddd\u79bb24)，124 (\u8ddd\u79bb2)，\u6700\u540e\u662f 183 (\u8ddd\u79bb59)\u3002<\/li>\n<\/ul>\n

      \u8f68\u8ff9\u4e3a：53 -> 65 -> 67 -> 37 -> 14 -> 98 -> 122 -> 124 -> 183
      \n\u603b\u5bfb\u9053\u8ddd\u79bb = 12+2+30+23+84+24+2+59 = 236<\/p>\n

      \u770b，\u603b\u8ddd\u79bb\u4ece640\u9aa4\u964d\u5230236，\u6027\u80fd\u63d0\u5347\u60ca\u4eba！SSTF\u6781\u5927\u5730\u51cf\u5c11\u4e86\u78c1\u5934\u7684\u6574\u4f53\u79fb\u52a8，\u63d0\u9ad8\u4e86\u541e\u5410\u91cf\u3002\u7136\u800c，\u5b83\u6709\u4e00\u4e2a\u81f4\u547d\u7684\u7f3a\u9677：\u9965\u997f\u3002\u60f3\u8c61\u4e00\u4e0b，\u5982\u679c\u4e0d\u65ad\u6709\u65b0\u7684\u8bf7\u6c42\u51fa\u73b0\u5728\u78c1\u5934\u5f53\u524d\u4f4d\u7f6e\u9644\u8fd1，\u90a3\u4e48\u90a3\u4e9b\u4f4d\u4e8e\u78c1\u76d8\u8fb9\u7f18\u7684\u8bf7\u6c42（\u6bd4\u5982\u78c1\u90530\u6216199）\u53ef\u80fd\u6c38\u8fdc\u5f97\u4e0d\u5230\u670d\u52a1\u3002\u5728\u9700\u8981\u4fdd\u8bc1\u670d\u52a1\u8d28\u91cf\u7684\u6570\u636e\u5e93\u6216\u5b9e\u65f6\u7cfb\u7edf\u4e2d，\u8fd9\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\u3002<\/p>\n

      2.3 SCAN\u4e0eLOOK：\u50cf\u7535\u68af\u4e00\u6837\u8fd0\u884c\u7684\u201c\u534f\u8c03\u8005\u201d<\/h4>\n

      \u4e3a\u4e86\u517c\u987e\u6027\u80fd\u548c\u516c\u5e73\u6027，SCAN\u7b97\u6cd5\u8bde\u751f\u4e86\u3002\u5b83\u8ba9\u78c1\u5934\u50cf\u7535\u68af\u4e00\u6837，\u4ece\u4e00\u7aef\u79fb\u52a8\u5230\u53e6\u4e00\u7aef，\u6cbf\u9014\u670d\u52a1\u6240\u6709\u8bf7\u6c42，\u5230\u8fbe\u5c3d\u5934\u540e\u6389\u5934\u8fd4\u56de\u3002\u5047\u8bbe\u521d\u59cb\u65b9\u5411\u662f\u5411\u78c1\u9053\u53f7\u589e\u5927\u65b9\u5411\u79fb\u52a8\u3002<\/p>\n

      SCAN\u8f68\u8ff9：\u4ece53\u51fa\u53d1，\u5411\u53f3（\u589e\u5927\u65b9\u5411）\u79fb\u52a8，\u670d\u52a1\u6cbf\u9014\u7684 65, 67, 98, 122, 124, 183，\u76f4\u5230\u5c3d\u5934199\u3002\u7136\u540e\u6389\u5934\u5411\u5de6，\u670d\u52a1 37, 14\u3002
      \n\u8f68\u8ff9：53 -> 65 -> 67 -> 98 -> 122 -> 124 -> 183 -> 199 -> 37 -> 14
      \n\u603b\u5bfb\u9053\u8ddd\u79bb = 12+2+31+24+2+59+16+162+23 = 331<\/p>\n

      SCAN\u907f\u514d\u4e86\u9965\u997f，\u56e0\u4e3a\u6bcf\u4e2a\u65b9\u5411\u7684\u8bf7\u6c42\u6700\u7ec8\u90fd\u4f1a\u88ab\u670d\u52a1\u3002\u4f46\u5b83\u4e5f\u6709\u95ee\u9898：\u4f4d\u4e8e\u78c1\u76d8\u4e24\u7aef\u7684\u8bf7\u6c42\u7b49\u5f85\u65f6\u95f4\u53ef\u80fd\u5f88\u957f（\u6bd4\u598214\u8981\u7b49\u5230\u78c1\u5934\u626b\u5b8c\u5168\u7a0b\u624d\u88ab\u5904\u7406）\u3002\u800c\u4e14，\u5f53\u78c1\u5934\u79fb\u52a8\u5230\u5c3d\u5934\u65f6，\u5373\u4f7f\u53cd\u65b9\u5411\u6ca1\u6709\u8bf7\u6c42，\u5b83\u4e5f\u4f1a\u7a7a\u8dd1，\u8fd9\u6709\u70b9\u6d6a\u8d39\u3002<\/p>\n

      \u4e8e\u662fLOOK\u7b97\u6cd5\u6539\u8fdb\u4e86\u8fd9\u4e00\u70b9：\u78c1\u5934\u53ea\u9700\u79fb\u52a8\u5230\u8be5\u65b9\u5411\u4e0a\u7684\u6700\u540e\u4e00\u4e2a\u8bf7\u6c42\u5904\u5c31\u6389\u5934，\u800c\u4e0d\u662f\u7269\u7406\u5c3d\u5934\u3002
      \nLOOK\u8f68\u8ff9：\u4ece53\u5411\u53f3，\u670d\u52a1\u5230183（\u6b64\u65b9\u5411\u6700\u540e\u4e00\u4e2a\u8bf7\u6c42）\u540e\u6389\u5934，\u5411\u5de6\u670d\u52a137, 14\u3002
      \n\u8f68\u8ff9：53 -> 65 -> 67 -> 98 -> 122 -> 124 -> 183 -> 37 -> 14
      \n\u603b\u5bfb\u9053\u8ddd\u79bb = 12+2+31+24+2+59+146+23 = 299<\/p>\n

      LOOK\u6bd4SCAN\u66f4\u9ad8\u6548（299 vs 331）\u3002\u5728\u5b9e\u9645\u7684Linux\u5185\u6838\u4e2d，deadline\u8c03\u5ea6\u5668\u5728\u67d0\u4e9b\u6a21\u5f0f\u4e0b\u5c31\u501f\u9274\u4e86LOOK\u7684\u601d\u60f3\u3002<\/p>\n

      3. \u73b0\u4ee3\u670d\u52a1\u5668\u7684\u5ba0\u513f：C-SCAN\u4e0eC-LOOK\u6df1\u5ea6\u5e94\u7528<\/h3>\n

      \u5bf9\u4e8e\u9700\u8981\u66f4\u5747\u5300\u54cd\u5e94\u65f6\u95f4\u7684\u7cfb\u7edf（\u5982\u89c6\u9891\u6d41\u670d\u52a1\u5668\u3001\u5728\u7ebf\u4ea4\u6613\u5904\u7406\u7cfb\u7edf），SCAN\/LOOK\u4e24\u7aef\u8bf7\u6c42\u7b49\u5f85\u65f6\u95f4\u5dee\u5f02\u5927\u7684\u95ee\u9898\u4f9d\u7136\u5b58\u5728\u3002C-SCAN（\u5faa\u73af\u626b\u63cf）\u65e8\u5728\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n

      3.1 C-SCAN：\u4e3a\u516c\u5e73\u6027\u727a\u7272\u4e00\u70b9\u6548\u7387<\/h4>\n

      C-SCAN\u89c4\u5b9a\u78c1\u5934\u53ea\u5355\u5411\u79fb\u52a8\u670d\u52a1\u8bf7\u6c42\u3002\u6bd4\u5982，\u4ece53\u5f00\u59cb\u5411\u53f3\u79fb\u52a8，\u670d\u52a1\u6240\u6709\u8bf7\u6c42\u76f4\u5230\u5c3d\u5934，\u7136\u540e\u7acb\u5373\u5feb\u901f\u8fd4\u56de\u8d77\u59cb\u7aef（\u4e0d\u670d\u52a1\u8bf7\u6c42），\u91cd\u65b0\u5f00\u59cb\u65b0\u7684\u4e00\u8f6e\u626b\u63cf\u3002\u5728\u6211\u4eec\u7684\u4f8b\u5b50\u4e2d：
      \n\u8f68\u8ff9：53 -> 65 -> 67 -> 98 -> 122 -> 124 -> 183 -> 199 -> (\u5feb\u901f\u8fd4\u56de0) -> 14 -> 37
      \n\u603b\u5bfb\u9053\u8ddd\u79bb = 12+2+31+24+2+59+16+199+14+23 = 382<\/p>\n

      \u6ce8\u610f：\u8fd9\u91cc\u8ba1\u7b97\u4e86\u4ece199\u8fd4\u56de0\u7684199\u4e2a\u78c1\u9053\u8ddd\u79bb\u3002\u5b9e\u9645\u4e0a，\u5feb\u901f\u8fd4\u56de\u65f6\u95f4\u53ef\u80fd\u5c0f\u4e8e\u9010\u78c1\u9053\u79fb\u52a8，\u4f46\u8ddd\u79bb\u4ecd\u88ab\u8ba1\u5165\u3002C-SCAN\u4fdd\u8bc1\u4e86\u6bcf\u4e2a\u8bf7\u6c42\u7684\u7b49\u5f85\u65f6\u95f4\u90fd\u6709\u4e00\u4e2a\u660e\u786e\u7684\u4e0a\u9650（\u6700\u591a\u4e24\u4e2a\u5b8c\u6574\u7684\u626b\u63cf\u5468\u671f），\u54cd\u5e94\u65f6\u95f4\u975e\u5e38\u5747\u5300\u3002\u4f46\u4ee3\u4ef7\u662f，\u78c1\u5934\u7a7a\u8dd1\u8fd4\u56de\u9020\u6210\u4e86\u989d\u5916\u7684\u5f00\u9500\u3002<\/p>\n

      3.2 C-LOOK：\u5728\u6548\u7387\u4e0e\u516c\u5e73\u95f4\u627e\u5230\u6700\u4f73\u5e73\u8861<\/h4>\n

      C-LOOK\u662fC-SCAN\u7684\u4f18\u5316\u7248\u672c，\u4e5f\u662f\u76ee\u524d\u8bb8\u591a\u73b0\u4ee3\u7cfb\u7edf（\u5982Linux CFQ\u8c03\u5ea6\u5668\u7684\u65e9\u671f\u7248\u672c\u7406\u5ff5）\u6240\u503e\u5411\u7684\u7b56\u7565\u3002\u5b83\u7ed3\u5408\u4e86LOOK\u548cC-SCAN\u7684\u4f18\u70b9：\u5355\u5411\u626b\u63cf，\u4e14\u53ea\u79fb\u52a8\u5230\u6709\u8bf7\u6c42\u7684\u6700\u8fdc\u70b9\u5c31\u8fd4\u56de\u3002<\/p>\n

      \u5bf9\u4e8e\u6211\u4eec\u7684\u961f\u5217，\u4ece53\u5411\u53f3\u626b\u63cf，\u6700\u8fdc\u7684\u8bf7\u6c42\u662f183\u3002\u670d\u52a1\u5b8c183\u540e，\u78c1\u5934\u7acb\u5373\u8df3\u8f6c\u5230\u5de6\u4fa7\u5269\u4f59\u8bf7\u6c42\u4e2d\u7684\u6700\u5c0f\u78c1\u9053\u53f714，\u7136\u540e\u7ee7\u7eed\u5411\u53f3\u626b\u63cf\u3002
      \n\u8f68\u8ff9：53 -> 65 -> 67 -> 98 -> 122 -> 124 -> 183 -> (\u8df3\u8f6c\u523014) -> 14 -> 37
      \n\u603b\u5bfb\u9053\u8ddd\u79bb = 12+2+31+24+2+59 + (183\u523014\u7684\u8df3\u8dc3\u8ddd\u79bb169) + 23 = 322<\/p>\n

      \u8fd9\u4e2a\u8ddd\u79bb（322）\u6bd4C-SCAN（382）\u5c0f，\u6bd4LOOK（299）\u7565\u5927，\u4f46\u5b83\u63d0\u4f9b\u4e86\u6bd4LOOK\u66f4\u5747\u5300\u7684\u54cd\u5e94\u65f6\u95f4\u5206\u5e03\u300214\u548c37\u4e0d\u518d\u9700\u8981\u7b49\u5f85\u78c1\u5934\u4ece\u6700\u53f3\u7aef\u626b\u56de\u6765，\u800c\u662f\u5728\u4e00\u8f6e\u7ed3\u675f\u540e\u7acb\u5373\u88ab\u670d\u52a1\u3002\u8fd9\u79cd\u7279\u6027\u4f7f\u5f97C-LOOK\u975e\u5e38\u9002\u5408\u8d1f\u8f7d\u8f83\u91cd\u3001\u8bf7\u6c42\u5206\u5e03\u76f8\u5bf9\u5747\u5300\u3001\u4e14\u8981\u6c42\u54cd\u5e94\u65f6\u95f4\u53ef\u9884\u6d4b\u7684\u670d\u52a1\u5668\u73af\u5883，\u4f8b\u5982Web\u5e94\u7528\u670d\u52a1\u5668\u3001\u6587\u4ef6\u670d\u52a1\u5668\u7b49\u3002<\/p>\n

      4. \u573a\u666f\u5316\u9009\u578b\u6307\u5357：\u4e3a\u4f60\u7684\u670d\u52a1\u5668\u201c\u91cf\u4f53\u88c1\u8863\u201d<\/h3>\n

      \u7406\u8bba\u4e0a\u7684\u8ba1\u7b97\u548c\u6d4b\u8bd5\u7ec8\u5f52\u662f\u7406\u60f3\u7684\u3002\u5728\u751f\u4ea7\u73af\u5883\u4e2d，\u9009\u62e9\u78c1\u76d8\u8c03\u5ea6\u7b97\u6cd5\u5fc5\u987b\u7d27\u5bc6\u7ed3\u5408\u4f60\u7684\u5177\u4f53\u5de5\u4f5c\u8d1f\u8f7d\u7279\u5f81\u3002\u4e0b\u9762\u6211\u4eec\u9488\u5bf9\u51e0\u79cd\u5178\u578b\u670d\u52a1\u5668\u573a\u666f\u8fdb\u884c\u5206\u6790：<\/p>\n

      \u573a\u666f\u4e00：\u6570\u636e\u5e93\u670d\u52a1\u5668（OLTP）<\/p>\n

        \n
      • \u8d1f\u8f7d\u7279\u5f81：\u5927\u91cf\u968f\u673a\u7684\u5c0f\u5757\u8bfb\u5199（4KB-16KB），I\/O\u8bf7\u6c42\u961f\u5217\u6df1\u5ea6\u7ecf\u5e38\u5f88\u9ad8，\u5bf9\u5ef6\u8fdf\u6781\u5176\u654f\u611f\u3002<\/li>\n
      • \u6311\u6218：SSTF\u53ef\u80fd\u56e0\u4e3a\u201c\u9965\u997f\u201d\u5bfc\u81f4\u67d0\u4e9b\u4e8b\u52a1\u8d85\u65f6；FCFS\u7684\u5ef6\u8fdf\u4e0d\u53ef\u63a7\u3002<\/li>\n
      • \u9009\u578b\u601d\u8003：deadline\u6216noop？\u5b9e\u9645\u4e0a，\u73b0\u4ee3Linux\u5185\u6838\u7684MQ-Deadline\u6216BFQ\u8c03\u5ea6\u5668\u66f4\u4e3a\u5e38\u89c1\u3002\u5b83\u4eec\u8d85\u8d8a\u4e86\u7b80\u5355\u7684\u78c1\u9053\u5bfb\u9053\u4f18\u5316\u3002\u4ee5Deadline\u4e3a\u4f8b，\u5b83\u4e3a\u6bcf\u4e2a\u8bf7\u6c42\u9644\u52a0\u4e00\u4e2a\u622a\u6b62\u65f6\u95f4，\u4f18\u5148\u5904\u7406\u5373\u5c06\u8d85\u65f6\u7684\u8bf7\u6c42，\u540c\u65f6\u4ecd\u4f1a\u8fdb\u884c\u7c7b\u4f3cC-LOOK\u7684\u6247\u533a\u6392\u5e8f\u6765\u4f18\u5316\u541e\u5410\u3002\u8fd9\u5b8c\u7f8e\u5951\u5408\u4e86\u6570\u636e\u5e93\u65e2\u8981\u4f4e\u5ef6\u8fdf\u53c8\u8981\u9ad8\u541e\u5410\u7684\u9700\u6c42\u3002# \u67e5\u770b\u5f53\u524d\u8bbe\u5907\u4f7f\u7528\u7684I\/O\u8c03\u5ea6\u5668
        \ncat \/sys\/block\/sda\/queue\/scheduler
        \n# \u4e34\u65f6\u5207\u6362\u4e3amq-deadline (\u5047\u8bbe\u652f\u6301)
        \necho mq-deadline > \/sys\/block\/sda\/queue\/scheduler<\/p>\n<\/li>\n<\/ul>\n

        \u573a\u666f\u4e8c：\u5927\u6570\u636e\u5206\u6790\/Hadoop HDFS\u6570\u636e\u8282\u70b9<\/p>\n

          \n
        • \u8d1f\u8f7d\u7279\u5f81：\u4ee5\u987a\u5e8f\u7684\u5927\u6587\u4ef6\u8bfb\u5199\u4e3a\u4e3b（128MB\u6216\u66f4\u5927\u5757），\u541e\u5410\u91cf\u662f\u9996\u8981\u6307\u6807，\u5bf9\u5355\u4e2aI\/O\u5ef6\u8fdf\u4e0d\u654f\u611f\u3002<\/li>\n
        • \u6311\u6218：\u9700\u8981\u6700\u5927\u5316\u987a\u5e8f\u8bfb\u5199\u7684\u5e26\u5bbd，\u51cf\u5c11\u78c1\u5934\u8df3\u8dc3\u3002<\/li>\n
        • \u9009\u578b\u601d\u8003：\u5bf9\u4e8e\u8fd9\u79cd\u9ad8\u5ea6\u987a\u5e8f\u5316\u7684\u8d1f\u8f7d，\u751a\u81f3NOOP（\u65e0\u64cd\u4f5c）\u8c03\u5ea6\u5668\u53ef\u80fd\u662f\u4e00\u4e2a\u597d\u9009\u62e9\u3002NOOP\u53ea\u662f\u7b80\u5355\u5730\u5c06\u8bf7\u6c42\u6309\u5230\u8fbe\u987a\u5e8f\u5408\u5e76\u540e\u63d0\u4ea4\u7ed9\u786c\u76d8，\u800c\u73b0\u4ee3\u786c\u76d8\u81ea\u8eab\u7684NCQ（\u672c\u5730\u547d\u4ee4\u961f\u5217）\u6280\u672f\u5df2\u7ecf\u975e\u5e38\u64c5\u957f\u4f18\u5316\u987a\u5e8f\u8bbf\u95ee\u3002\u590d\u6742\u7684\u64cd\u4f5c\u7cfb\u7edf\u7ea7\u8c03\u5ea6\u53cd\u800c\u53ef\u80fd\u589e\u52a0\u4e0d\u5fc5\u8981\u7684\u5f00\u9500\u3002\u5f53\u7136，\u5982\u679c\u8d1f\u8f7d\u4e2d\u6df7\u5408\u4e86\u90e8\u5206\u968f\u673a\u8bbf\u95ee，CFQ\u6216BFQ\u7684\u6309\u8fdb\u7a0b\u914d\u989d\u7ba1\u7406\u53ef\u80fd\u66f4\u5408\u9002\u3002<\/li>\n<\/ul>\n

          \u573a\u666f\u4e09：\u865a\u62df\u5316\u5bbf\u4e3b\u673a（\u8fd0\u884c\u591a\u4e2aVM）<\/p>\n

            \n
          • \u8d1f\u8f7d\u7279\u5f81：\u6df7\u5408\u4e86\u591a\u79cd\u622a\u7136\u4e0d\u540c\u7684I\/O\u6a21\u5f0f（\u4e00\u4e2aVM\u8dd1\u6570\u636e\u5e93，\u53e6\u4e00\u4e2aVM\u505aWeb\u670d\u52a1\u5668，\u7b2c\u4e09\u4e2a\u5728\u5907\u4efd\u6570\u636e），\u9700\u8981\u516c\u5e73\u5730\u5728\u865a\u62df\u673a\u95f4\u5206\u914dI\/O\u5e26\u5bbd，\u9632\u6b62\u67d0\u4e2aVM\u997f\u6b7b\u5176\u4ed6VM\u3002<\/li>\n
          • \u6311\u6218：\u4fdd\u8bc1\u9694\u79bb\u6027\u548c\u516c\u5e73\u6027\u3002<\/li>\n
          • \u9009\u578b\u601d\u8003：BFQ（\u9884\u7b97\u516c\u5e73\u961f\u5217） \u8c03\u5ea6\u5668\u5728\u8fd9\u91cc\u5927\u653e\u5f02\u5f69\u3002BFQ\u7684\u76ee\u6807\u662f\u4e3a\u6bcf\u4e2a\u8fdb\u7a0b（\u6216cgroup）\u63d0\u4f9b\u516c\u5e73\u7684\u78c1\u76d8\u65f6\u95f4\u7247，\u800c\u4e0d\u662f\u5355\u7eaf\u4f18\u5316\u5bfb\u9053\u3002\u5b83\u80fd\u786e\u4fdd\u5373\u4f7f\u6709\u4e00\u4e2aVM\u5728\u8fdb\u884c\u75af\u72c2\u7684\u987a\u5e8f\u5199\u5165，\u5176\u4ed6VM\u7684\u4ea4\u4e92\u5f0f\u8bf7\u6c42\u4ecd\u7136\u80fd\u83b7\u5f97\u53ef\u63a5\u53d7\u7684\u54cd\u5e94\u65f6\u95f4\u3002\u5b83\u7684\u914d\u7f6e\u53c2\u6570\u4e5f\u66f4\u4e30\u5bcc，\u5141\u8bb8\u4f60\u6839\u636e\u6743\u91cd\u8c03\u6574\u4e0d\u540cVM\u7684I\/O\u4f18\u5148\u7ea7\u3002<\/li>\n<\/ul>\n

            \u573a\u666f\u56db：\u9ad8\u6027\u80fd\u8ba1\u7b97（HPC）\u6216\u89c6\u9891\u6e32\u67d3\u519c\u573a<\/p>\n

              \n
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            • \u9009\u578b\u601d\u8003：\u7c7b\u4f3c\u573a\u666f\u4e8c，\u4f46\u5e76\u53d1\u66f4\u9ad8\u3002Kyber\u8c03\u5ea6\u5668\u662f\u4e00\u4e2a\u8f83\u65b0\u7684\u9009\u62e9，\u5b83\u4e13\u6ce8\u4e8e\u4f4e\u5ef6\u8fdf，\u540c\u65f6\u80fd\u5f88\u597d\u5730\u5904\u7406\u591a\u961f\u5217\u8bbe\u5907\u3002\u6216\u8005，\u5982\u679c\u7ecf\u8fc7\u6d4b\u8bd5\u53d1\u73b0\u8d1f\u8f7d\u786e\u5b9e\u662f\u7eaf\u7cb9\u7684\u987a\u5e8f\u6d41，NOOP\u6216None（\u5bf9\u4e8e\u591a\u961f\u5217\u8bbe\u5907）\u53ef\u80fd\u5e26\u6765\u6700\u4f73\u7684\u541e\u5410\u6027\u80fd\u3002<\/li>\n<\/ul>\n

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