{"id":47063,"date":"2025-07-30T05:57:06","date_gmt":"2025-07-29T21:57:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/47063.html"},"modified":"2025-07-30T05:57:06","modified_gmt":"2025-07-29T21:57:06","slug":"%e7%a7%91%e6%99%ae%e6%96%87%ef%bc%9a%e8%bd%af%e4%bb%b6%e6%9e%b6%e6%9e%84%e6%96%b9%e6%b3%95%e8%ae%ba%e3%80%90little%e5%ae%9a%e5%be%8b%ef%bc%88littles-law%ef%bc%89%ef%bc%9al-%ce%bb-x-w","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/47063.html","title":{"rendered":"\u79d1\u666e\u6587\uff1a\u8f6f\u4ef6\u67b6\u6784\u65b9\u6cd5\u8bba\u3010Little\u5b9a\u5f8b\uff08Little\u2018s Law\uff09\uff1aL = \u03bb \u00d7 W \u4f30\u7b97\u670d\u52a1\u5668\u6027\u80fd\u548c\u786c\u4ef6\u8d44\u6e90\u3011"},"content":{"rendered":"<h2 style=\"background-color:transparent\">\u6982\u53d9<\/h2>\n<p>\u79d1\u666e\u6587&#xff1a;\u8f6f\u4ef6\u67b6\u6784\u65b9\u6cd5\u8bba\u3010Little\u5b9a\u5f8b&#xff08;Little\u2018s Law&#xff09;\u8be6\u89e3\u3011-CSDN\u535a\u5ba2<\/p>\n<p>\u79d1\u666e\u6587&#xff1a;\u8f6f\u4ef6\u67b6\u6784\u4e4bLinux\u670d\u52a1\u5668\u6027\u80fd\u3010web\u5e94\u7528\u4e4b\u54cd\u5e94\u65f6\u95f4&#xff08;Response Time, RT&#xff09;\u8be6\u89e3\u3011-CSDN\u535a\u5ba2<\/p>\n<p>\u79d1\u666e\u6587&#xff1a;\u8f6f\u4ef6\u67b6\u6784\u4e4bLinux\u670d\u52a1\u5668\u6027\u80fd\u3010\u54cd\u5e94\u65f6\u95f4&#xff08;Response Time, RT&#xff09;\u4e4b\u7f51\u7edc\u5f00\u9500\u8be6\u89e3\u3011-CSDN\u535a\u5ba2<\/p>\n<p>\u79d1\u666e\u6587&#xff1a;\u8f6f\u4ef6\u67b6\u6784\u4e4bLinux\u670d\u52a1\u5668\u6027\u80fd\u3010\u641e\u6e05\u695aQPS\u3001\u5ef6\u8fdf\u3001\u5e26\u5bbd\u3001\u670d\u52a1\u5668tcp\u8fde\u63a5\u6570\u3001\u670d\u52a1\u5668\u6027\u80fd\u3001\u670d\u52a1\u5668\u786c\u4ef6\u8d44\u6e90\u4e4b\u95f4\u7684\u5173\u7cfb\u3011_qps\u548c\u5e26\u5bbd\u4e4b\u95f4\u7684\u5173\u7cfb-CSDN\u535a\u5ba2<\/p>\n<p>\u79d1\u666e\u6587&#xff1a;\u8f6f\u4ef6\u67b6\u6784\u4e4bLinux\u670d\u52a1\u5668\u6027\u80fd\u3010\u8fde\u63a5\u6570&#xff1a;\u5355\u53f0\u670d\u52a1\u5668\u652f\u6301\u591a\u5c11TCP\u8fde\u63a5&#xff1f;6.4\u4e07&#xff1f;\u3011-CSDN\u535a\u5ba2<\/p>\n<p>\u6458\u8981&#xff1a;Little\u5b9a\u5f8b&#xff08;L&#061;\u03bb\u00d7W&#xff09;\u662f\u6392\u961f\u8bba\u4e2d\u7684\u6838\u5fc3\u516c\u5f0f&#xff0c;\u63ed\u793a\u4e86\u7cfb\u7edf\u5e76\u53d1\u6570&#xff08;L&#xff09;\u3001\u8bf7\u6c42\u5230\u8fbe\u7387&#xff08;QPS\/\u03bb&#xff09;\u4e0e\u54cd\u5e94\u65f6\u95f4&#xff08;W\/RT&#xff09;\u7684\u5b9a\u91cf\u5173\u7cfb&#xff0c;\u4e3a\u670d\u52a1\u5668\u6027\u80fd\u5206\u6790\u63d0\u4f9b\u7406\u8bba\u57fa\u7840\u3002<\/p>\n<p>\u901a\u8fc7\u8be5\u5b9a\u5f8b\u53ef\u8ba1\u7b97\u7ebf\u7a0b\u6c60\u89c4\u6a21\u3001\u6570\u636e\u5e93\u8fde\u63a5\u6570\u7b49\u5173\u952e\u53c2\u6570&#xff0c;\u6307\u5bfcCPU\u6838\u6570\u3001\u5185\u5b58\u7b49\u786c\u4ef6\u8d44\u6e90\u914d\u7f6e\u3002\u5b9e\u9645\u5e94\u7528\u4e2d\u9700\u6ce8\u610f\u5355\u4f4d\u7edf\u4e00&#xff08;\u6beb\u79d2\u8f6c\u79d2&#xff09;\u3001\u7a33\u6001\u7cfb\u7edf\u5047\u8bbe\u53ca\u7a81\u53d1\u6d41\u91cf\u7f13\u51b2&#xff08;\u5efa\u8bae20%-50%\u5197\u4f59&#xff09;\u3002<\/p>\n<p>\u7ed3\u5408QPS\u4e0eRT\u7684\u76f8\u4e92\u5236\u7ea6\u5173\u7cfb&#xff0c;\u53ef\u4f18\u5316\u7cfb\u7edf\u541e\u5410\u4e0e\u5ef6\u8fdf&#xff0c;\u5b9e\u73b0\u8d44\u6e90\u6210\u672c\u4e0e\u6027\u80fd\u7684\u5e73\u8861\u3002\u8be5\u5b9a\u5f8b\u9002\u7528\u4e8eWeb\u6027\u80fd\u5206\u6790\u3001\u5bb9\u91cf\u89c4\u5212\u3001\u961f\u5217\u4f18\u5316\u7b49\u573a\u666f&#xff0c;\u9700\u914d\u5408\u76d1\u63a7\u5de5\u5177\u52a8\u6001\u8c03\u6574&#xff0c;\u662f\u9ad8\u5e76\u53d1\u7cfb\u7edf\u8bbe\u8ba1\u7684\u6838\u5fc3\u65b9\u6cd5\u8bba\u4e4b\u4e00\u3002<\/p>\n<p>&#xff08;\u6ce8&#xff1a;\u4e25\u683c\u63a7\u5236\u5728150\u5b57&#xff0c;\u63d0\u70bc\u6838\u5fc3\u539f\u7406\u3001\u5e94\u7528\u65b9\u6cd5\u548c\u6ce8\u610f\u4e8b\u9879&#xff09;<\/p>\n<p><span style=\"color:#fe2c24\">Little\u5b9a\u5f8b&#xff08;L &#061; 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Grafana&#xff09;\u5b9e\u65f6\u89c2\u6d4b\u00a0QPS\u3001RT\u3001\u6d3b\u8dc3\u7ebf\u7a0b\u6570\u3001CPU\/\u5185\u5b58\u4f7f\u7528\u7387&#xff0c;\u52a8\u6001\u8c03\u6574\u8d44\u6e90\u914d\u7f6e\u3002<\/li>\n<li>\u5bf9\u4e8e\u9ad8\u5e76\u53d1\u7cfb\u7edf&#xff0c;\u53ef\u7ed3\u5408\u00a0\u5f02\u6b65 IO\u3001\u534f\u7a0b\u3001\u7f13\u5b58\u3001\u961f\u5217\u524a\u5cf0\u00a0\u7b49\u624b\u6bb5&#xff0c;\u964d\u4f4e RT \u548c L&#xff0c;\u4ece\u800c\u51cf\u5c11\u786c\u4ef6\u6210\u672c\u3002<\/li>\n<\/ul>\n<p>Little \u5b9a\u5f8b&#xff08;L &#061; QPS \u00d7 RT&#xff09;\u662f\u4f30\u7b97\u670d\u52a1\u5668\u5e76\u53d1\u8d1f\u8f7d\u4e0e\u8d44\u6e90\u9700\u6c42\u7684\u57fa\u77f3\u516c\u5f0f&#xff0c;\u901a\u8fc7\u63a7\u5236 QPS \u548c\u4f18\u5316 RT&#xff0c;\u53ef\u4ee5\u6709\u6548\u89c4\u5212\u7ebf\u7a0b\u3001\u5185\u5b58\u3001\u8fde\u63a5\u6570\u7b49\u786c\u4ef6\u8d44\u6e90&#xff0c;\u4fdd\u969c\u7cfb\u7edf\u7a33\u5b9a\u9ad8\u6548\u8fd0\u884c\u3002<\/p>\n<table>\n<tr>\u5e94\u7528\u9886\u57df\u53ef\u7528\u6765\u8ba1\u7b97\u6216\u5206\u6790\u4ec0\u4e48&#xff1f;<\/tr>\n<tbody>\n<tr>\n<td>Web\u6027\u80fd\u5206\u6790<\/td>\n<td>\u5e76\u53d1\u8bf7\u6c42\u6570\u3001QPS\u3001\u54cd\u5e94\u65f6\u95f4\u7684\u5173\u7cfb<\/td>\n<\/tr>\n<tr>\n<td>\u6392\u961f\u7cfb\u7edf<\/td>\n<td>\u961f\u5217\u957f\u5ea6\u3001\u670d\u52a1\u901f\u7387\u3001\u5ba2\u6237\u7b49\u5f85\u65f6\u95f4<\/td>\n<\/tr>\n<tr>\n<td>\u670d\u52a1\u5668\u5bb9\u91cf\u89c4\u5212<\/td>\n<td>\u9884\u4f30\u9700\u8981\u591a\u5c11\u8d44\u6e90\u6765\u652f\u6491\u9884\u671f\u7684\u5e76\u53d1\u91cf<\/td>\n<\/tr>\n<tr>\n<td>\u7ebf\u7a0b\u6c60\/\u8fde\u63a5\u6c60\u8c03\u4f18<\/td>\n<td>\u7ebf\u7a0b\u6570\u3001\u4efb\u52a1\u5904\u7406\u65f6\u95f4\u3001\u4efb\u52a1\u5230\u8fbe\u7387\u7684\u5173\u7cfb<\/td>\n<\/tr>\n<tr>\n<td>\u7528\u6237\u4f53\u9a8c\u4f18\u5316<\/td>\n<td>\u5206\u6790\u7528\u6237\u505c\u7559\u65f6\u95f4\u4e0e\u8bbf\u95ee\u9891\u7387\u5bf9\u7cfb\u7edf\u8d1f\u8f7d\u7684\u5f71\u54cd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Little\u5b9a\u5f8b&#xff08;Little\u2018s Law&#xff09;\u4f30\u7b97\u670d\u52a1\u5668\u6027\u80fd\u548c\u786c\u4ef6\u8d44\u6e90<\/h2>\n<h3 style=\"background-color:transparent\">1.\u6838\u5fc3\u6307\u6807\u8ba1\u7b97\u6a21\u578b<\/h3>\n<p>\u6839\u636eLittle\u5b9a\u5f8b(L &#061; \u03bb \u00d7 W)&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5efa\u7acb\u4ee5\u4e0b\u8ba1\u7b97\u5173\u7cfb&#xff1a;<\/p>\n<ul>\n<li>\u200c\u5e76\u53d1\u6570(L)\u200c &#061; QPS(\u03bb) \u00d7 \u5e73\u5747\u54cd\u5e94\u65f6\u95f4(W)<\/li>\n<li>\u200c\u54cd\u5e94\u65f6\u95f4(W)\u200c &#061; \u5e76\u53d1\u6570(L) \/ QPS(\u03bb)<\/li>\n<\/ul>\n<p>\u5176\u4e2d&#xff1a;<\/p>\n<ul>\n<li>\u200c\u5e76\u53d1\u6570\u200c&#xff1a;\u7cfb\u7edf\u540c\u65f6\u5904\u7406\u7684\u8bf7\u6c42\u6570\u91cf<\/li>\n<li>\u200cQPS\u200c&#xff1a;\u6bcf\u79d2\u67e5\u8be2\u7387(Queries Per Second)<\/li>\n<li>\u200c\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\u200c&#xff1a;\u8bf7\u6c42\u4ece\u8fdb\u5165\u5230\u79bb\u5f00\u7cfb\u7edf\u7684\u5e73\u5747\u8017\u65f6<\/li>\n<\/ul>\n<h3>2.\u6ce8\u610f\u4e8b\u9879<\/h3>\n<li>\u200c\u7cfb\u7edf\u7a33\u5b9a\u6027\u524d\u63d0\u200c&#xff1a;\u5b9a\u5f8b\u4ec5\u9002\u7528\u4e8e\u957f\u671f\u7a33\u5b9a\u8fd0\u884c\u7684\u7cfb\u7edf<\/li>\n<li>\u200c\u65f6\u95f4\u5355\u4f4d\u7edf\u4e00\u200c&#xff1a;\u786e\u4fdd\u6240\u6709\u65f6\u95f4\u53c2\u6570\u4f7f\u7528\u76f8\u540c\u5355\u4f4d(\u79d2\/\u6beb\u79d2)<\/li>\n<li>\u200c\u975e\u62a2\u5360\u5f0f\u5047\u8bbe\u200c&#xff1a;\u4e0d\u8003\u8651\u4f18\u5148\u7ea7\u63d2\u961f\u7b49\u7279\u6b8a\u60c5\u51b5<\/li>\n<li>\u200c\u8d44\u6e90\u74f6\u9888\u8bc6\u522b\u200c&#xff1a;\u5b9e\u9645\u6027\u80fd\u53d7\u9650\u4e8e\u7cfb\u7edf\u4e2d\u6700\u6162\u7684\u7ec4\u4ef6(CPU\/IO\/\u7f51\u7edc\u7b49)<\/li>\n<p>1.\u00a0RT \u5355\u4f4d\u7edf\u4e00&#xff1a;\u82e5 RT \u662f\u00a0\u6beb\u79d2&#xff08;ms&#xff09;&#xff0c;\u8ba1\u7b97\u65f6\u8981\u8f6c\u6362\u4e3a\u00a0\u79d2&#xff08;s&#xff09;&#xff08;\u5982 100ms &#061; 0.1s&#xff09;&#xff0c;\u5426\u5219 L \u7684\u6570\u91cf\u7ea7\u4f1a\u51fa\u9519\u3002<\/p>\n<p>2.\u00a0QPS \u4e0e RT \u7684\u5173\u7cfb\u662f\u76f8\u4e92\u5236\u7ea6\u7684<\/p>\n<ul>\n<li>\u63d0\u9ad8 QPS&#xff0c;\u82e5 RT \u4e0d\u53d8&#xff0c;\u5219 L&#xff08;\u5e76\u53d1\u6570&#xff09;\u7ebf\u6027\u589e\u957f \u2192 \u9700\u66f4\u591a\u8d44\u6e90\u3002<\/li>\n<li>\u964d\u4f4e RT&#xff08;\u4f18\u5316\u4ee3\u7801\u3001\u7f13\u5b58\u3001\u5f02\u6b65\u5316\u7b49&#xff09;\u2192 \u53ef\u652f\u6491\u66f4\u9ad8 QPS&#xff0c;\u4e14\u4e0d\u9700\u8981\u5927\u5e45\u589e\u52a0\u5e76\u53d1\u7ebf\u7a0b\/\u8fde\u63a5\u6570\u3002<\/li>\n<\/ul>\n<p>3.\u00a0Little \u5b9a\u5f8b\u9002\u7528\u4e8e\u201c\u7a33\u6001\u7cfb\u7edf\u201d&#xff1a;\u5373\u6d41\u91cf\u76f8\u5bf9\u5e73\u7a33\u3001\u6ca1\u6709\u5267\u70c8\u6ce2\u52a8\u7684\u573a\u666f\u3002\u7a81\u53d1\u6d41\u91cf&#xff08;\u5982\u79d2\u6740&#xff09;\u9700\u8981\u989d\u5916\u8003\u8651\u00a0\u5cf0\u503c\u8d1f\u8f7d\u00a0\u548c\u00a0\u7f13\u51b2\u80fd\u529b\u3002<\/p>\n<p>4.\u00a0\u4e0d\u8003\u8651\u6392\u961f\u4e0e\u4e22\u5f03&#xff1a;Little \u5b9a\u5f8b\u5047\u8bbe\u7cfb\u7edf\u662f\u00a0\u7a33\u5b9a\u7684\u961f\u5217\u6a21\u578b&#xff08;\u5982 M\/M\/1 \u6216 M\/G\/1&#xff09;&#xff0c;\u771f\u5b9e\u7cfb\u7edf\u4e2d\u5982\u679c\u5e76\u53d1\u8bf7\u6c42\u6570\u8d85\u8fc7\u5904\u7406\u80fd\u529b&#xff0c;\u53ef\u80fd\u51fa\u73b0\u00a0\u6392\u961f\u5ef6\u8fdf\u589e\u52a0\u00a0\u6216\u00a0\u8bf7\u6c42\u4e22\u5f03\/\u8d85\u65f6&#xff0c;\u9700\u7ed3\u5408\u961f\u5217\u7406\u8bba&#xff08;\u5982\u6392\u961f\u8bba\u4e2d\u7684 M\/M\/c \u6a21\u578b&#xff09;\u8fdb\u4e00\u6b65\u5206\u6790\u3002<\/p>\n<p>\u901a\u8fc7\u5408\u7406\u5e94\u7528Little\u5b9a\u5f8b&#xff0c;\u53ef\u4ee5\u79d1\u5b66\u5730\u8bc4\u4f30\u7cfb\u7edf\u6027\u80fd\u9700\u6c42&#xff0c;\u4f18\u5316\u786c\u4ef6\u8d44\u6e90\u914d\u7f6e&#xff0c;\u5b9e\u73b0\u6210\u672c\u4e0e\u6027\u80fd\u7684\u6700\u4f73\u5e73\u8861\u3002<\/p>\n<h3 style=\"background-color:transparent\">3. \u57fa\u7840\u8ba1\u7b97\u6a21\u578b<\/h3>\n<p>Little \u5b9a\u5f8b&#xff08;Little&#039;s Law&#xff09;\u00a0\u662f\u6392\u961f\u8bba\u4e2d\u7684\u4e00\u4e2a\u7ecf\u5178\u516c\u5f0f&#xff0c;\u7528\u4e8e\u63cf\u8ff0\u7cfb\u7edf\u4e2d\u7684\u00a0\u5e73\u5747\u8bf7\u6c42\u6570&#xff08;\u961f\u5217\u957f\u5ea6&#xff09;\u3001\u8bf7\u6c42\u5230\u8fbe\u901f\u7387&#xff08;QPS&#xff09;\u548c\u5e73\u5747\u54cd\u5e94\u65f6\u95f4&#xff08;RT&#xff09;\u00a0\u4e09\u8005\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n<p>\u5728\u00a0\u670d\u52a1\u5668\u6027\u80fd\u4f30\u7b97\u4e0e\u786c\u4ef6\u8d44\u6e90\u89c4\u5212\u00a0\u4e2d&#xff0c;Little \u5b9a\u5f8b\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u901a\u8fc7\u00a0QPS&#xff08;\u6bcf\u79d2\u67e5\u8be2\u6570&#xff09;\u548c\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\u00a0\u6765\u63a8\u7b97\u7cfb\u7edf\u6240\u9700\u7684\u00a0\u5e76\u53d1\u8bf7\u6c42\u6570&#xff08;\u5373\u7cfb\u7edf\u5e73\u5747\u8d1f\u8f7d&#xff09;&#xff0c;\u8fdb\u800c\u6307\u5bfc\u670d\u52a1\u5668\u8d44\u6e90\u914d\u7f6e&#xff08;\u5982 CPU\u3001\u5185\u5b58\u3001\u8fde\u63a5\u6570\u7b49&#xff09;\u3002<\/p>\n<p>Little \u5b9a\u5f8b\u7684\u57fa\u672c\u516c\u5f0f\u4e3a&#xff1a;L&#xff08;\u5373 N\u5e76\u53d1\u8bf7\u6c42\u6570&#xff09;&#061;\u00a0\u03bb&#xff08;\u5373QPS&#xff09; *\u00a0W&#xff08;\u5373RT&#xff09;<\/p>\n<p>\u5176\u4e2d&#xff1a;<\/p>\n<table>\n<tr>\u7b26\u53f7\u542b\u4e49\u5355\u4f4d\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>L<\/td>\n<td>\u7cfb\u7edf\u4e2d\u7684\u5e73\u5747\u5e76\u53d1\u8bf7\u6c42\u6570&#xff08;\u5e73\u5747\u961f\u5217\u957f\u5ea6 \/ \u5e73\u5747\u8d1f\u8f7d&#xff09;<\/td>\n<td>\u4e2a&#xff08;\u8bf7\u6c42&#xff09;<\/td>\n<td>\u5373\u7cfb\u7edf\u4efb\u610f\u65f6\u523b\u6b63\u5728\u5904\u7406\u6216\u7b49\u5f85\u5904\u7406\u7684\u8bf7\u6c42\u6570\u91cf<\/td>\n<\/tr>\n<tr>\n<td>\u03bb (lambda)<\/td>\n<td>\u8bf7\u6c42\u7684\u5230\u8fbe\u901f\u7387&#xff08;\u5373 QPS&#xff0c;Queries Per Second&#xff09;<\/td>\n<td>\u4e2a\/\u79d2<\/td>\n<td>\u6bcf\u79d2\u6709\u591a\u5c11\u4e2a\u8bf7\u6c42\u8fdb\u5165\u7cfb\u7edf<\/td>\n<\/tr>\n<tr>\n<td>W<\/td>\n<td>\u6bcf\u4e2a\u8bf7\u6c42\u5728\u7cfb\u7edf\u4e2d\u7684\u5e73\u5747\u505c\u7559\u65f6\u95f4&#xff08;\u5373\u5e73\u5747\u54cd\u5e94\u65f6\u95f4&#xff09;<\/td>\n<td>\u79d2&#xff08;s&#xff09;<\/td>\n<td>\u5305\u62ec\u5904\u7406\u65f6\u95f4 &#043; \u7b49\u5f85\u65f6\u95f4&#xff08;\u4ece\u8bf7\u6c42\u8fdb\u5165\u7cfb\u7edf\u5230\u5b8c\u6210\u7684\u603b\u65f6\u957f&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&gt; &#x1f4cc;\u00a0\u6ce8\u610f&#xff1a;\u5728\u6027\u80fd\u9886\u57df&#xff0c;W \u901a\u5e38\u4e5f\u79f0\u4e3a\u00a0RT&#xff08;Response Time&#xff0c;\u54cd\u5e94\u65f6\u95f4&#xff09;\u00a0\u6216\u00a0\u5ef6\u8fdf&#xff08;Latency&#xff09;&#xff0c;\u5355\u4f4d\u4e3a\u79d2&#xff08;\u6216\u6beb\u79d2&#xff0c;\u9700\u7edf\u4e00\u6362\u7b97&#xff09;\u3002<\/p>\n<table>\n<tr>\u76ee\u6807\u4f7f\u7528\u65b9\u6cd5\u516c\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>\u4f30\u7b97\u7cfb\u7edf\u5e73\u5747\u5e76\u53d1\u6570&#xff08;\u8d1f\u8f7d L&#xff09;<\/td>\n<td>\u5df2\u77e5 QPS \u548c RT \u2192 \u8ba1\u7b97 L<\/td>\n<td>L&#061;QPS\u00d7RT<\/td>\n<\/tr>\n<tr>\n<td>\u63a8\u5bfc\u652f\u6491 QPS \u6240\u9700\u7684\u5e76\u53d1\u80fd\u529b<\/td>\n<td>\u5df2\u77e5\u6700\u5927\u5e76\u53d1\u6570 L \u548c\u76ee\u6807 RT \u2192 \u53cd\u63a8 QPS \u4e0a\u9650<\/td>\n<td>QPS&#061;L\/RT<\/td>\n<\/tr>\n<tr>\n<td>\u6307\u5bfc\u7ebf\u7a0b\u6c60 \/ \u8fde\u63a5\u6c60\u914d\u7f6e<\/td>\n<td>\u6839\u636e L \u8bbe\u7f6e\u7ebf\u7a0b\/\u8fde\u63a5\u6570&#xff08;\u901a\u5e38 L \u6216\u7a0d\u9ad8&#xff09;<\/td>\n<td>\u4f8b\u5982&#xff1a;\u7ebf\u7a0b\u6c60 \u2248 L<\/td>\n<\/tr>\n<tr>\n<td>\u4f18\u5316\u8d44\u6e90\u5206\u914d&#xff08;CPU\/\u5185\u5b58&#xff09;<\/td>\n<td>\u6839\u636e L \u548c\u6bcf\u4e2a\u8bf7\u6c42\u7684\u8d44\u6e90\u5f00\u9500&#xff0c;\u4f30\u7b97\u603b\u9700\u6c42<\/td>\n<td>\u5982\u5185\u5b58 \u2248 L \u00d7 \u6bcf\u8bf7\u6c42\u5185\u5b58<\/td>\n<\/tr>\n<tr>\n<td>\u53d1\u73b0\u6027\u80fd\u74f6\u9888<\/td>\n<td>\u82e5 L \u8fc7\u9ad8\u4f46\u8d44\u6e90\u6709\u9650 \u2192 \u9700\u4f18\u5316 RT \u6216\u6269\u5bb9<\/td>\n<td>\u964d\u4f4e RT \u6216\u63d0\u5347 QPS \u5bb9\u91cf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u200c\u5df2\u77e5QPS\u548c\u54cd\u5e94\u65f6\u95f4\u200c&#xff1a;\u53ef\u76f4\u63a5\u8ba1\u7b97\u7cfb\u7edf\u6240\u9700\u5e76\u53d1\u5904\u7406\u80fd\u529b<\/li>\n<li>\u200c\u5df2\u77e5\u5e76\u53d1\u6570\u548c\u54cd\u5e94\u65f6\u95f4\u200c&#xff1a;\u53ef\u63a8\u7b97\u7cfb\u7edf\u80fd\u8fbe\u5230\u7684QPS\u4e0a\u9650<\/li>\n<li>\u200c\u5df2\u77e5QPS\u548c\u5e76\u53d1\u6570\u200c&#xff1a;\u53ef\u8bc4\u4f30\u7cfb\u7edf\u5e73\u5747\u54cd\u5e94\u65f6\u95f4<\/li>\n<\/ul>\n<h3 style=\"background-color:transparent\">4. \u786c\u4ef6\u8d44\u6e90\u914d\u7f6e\u4f30\u7b97<\/h3>\n<ul>\n<li>\u200cCPU\u6838\u5fc3\u6570\u200c&#xff1a;\u5efa\u8bae\u5e76\u53d1\u6570 \u2248 CPU\u6838\u5fc3\u6570 \u00d7 2~4\u500d(\u8003\u8651\u8d85\u7ebf\u7a0b\u548cIO\u7b49\u5f85)<\/li>\n<li>\u200c\u5185\u5b58\u9700\u6c42\u200c&#xff1a;\u5e76\u53d1\u6570 \u00d7 \u5355\u8bf7\u6c42\u5185\u5b58\u6d88\u8017 &#043; \u7cfb\u7edf\u57fa\u7840\u5185\u5b58<\/li>\n<li>\u200c\u7f51\u7edc\u5e26\u5bbd\u200c&#xff1a;QPS \u00d7 \u5e73\u5747\u54cd\u5e94\u6570\u636e\u5927\u5c0f \u00d7 8(bit\u8f6c\u6362)<\/li>\n<\/ul>\n<h3 style=\"background-color:transparent\"><span style=\"color:#fe2c24\">5. Little\u5b9a\u5f8b&#xff08;L &#061; \u03bb \u00d7 W&#xff09;<\/span>\u5b9e\u6218&#xff1a;\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h3>\n<h4 style=\"background-color:transparent\">&#xff08;1&#xff09;\u8ba1\u7b97\u5e76\u53d1\u8bf7\u6c42\u6570&#xff08;L&#xff09;<\/h4>\n<p>\u5047\u8bbe&#xff1a;<\/p>\n<ul>\n<li>QPS&#xff08;\u03bb&#xff09; &#061; 1000 \u8bf7\u6c42\/\u79d2<\/li>\n<li>\u5e73\u5747\u54cd\u5e94\u65f6\u95f4&#xff08;W&#xff09; &#061; 50ms&#xff08;0.05\u79d2&#xff09;<\/li>\n<\/ul>\n<p>\u5219&#xff1a; L&#061;1000\u00d70.05&#061;50\u00a0\u7ed3\u8bba&#xff1a;\u7cfb\u7edf\u9700\u8981 50 \u4e2a\u5e76\u53d1\u7ebf\u7a0b\/\u8fde\u63a5 \u624d\u80fd\u5904\u7406 1000 QPS\u3002<\/p>\n<h4 style=\"background-color:transparent\">&#xff08;2&#xff09;\u4f30\u7b97 CPU \u6838\u5fc3\u6570<\/h4>\n<p>\u5047\u8bbe&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u8bf7\u6c42\u5360\u7528 CPU \u65f6\u95f4 &#061; 10ms<\/li>\n<li>QPS&#xff08;\u03bb&#xff09; &#061; 1000 \u8bf7\u6c42\/\u79d2<\/li>\n<li>CPU \u6838\u5fc3\u6570 &#061; ?<\/li>\n<\/ul>\n<p>\u8ba1\u7b97 CPU \u5229\u7528\u7387&#xff08;U&#xff09;&#xff1a; U&#061;\u03bb\u00d7CPU\u65f6\u95f4&#061;1000\u00d70.01&#061;10<\/p>\n<p>\u00a0\u7ed3\u8bba&#xff1a;<\/p>\n<ul>\n<li>10 \u6838 CPU \u53ef\u8fbe\u5230 100% \u5229\u7528\u7387&#xff08;\u4f46\u5b9e\u9645\u751f\u4ea7\u73af\u5883\u5efa\u8bae\u00a070% \u8d1f\u8f7d&#xff0c;\u907f\u514d\u6027\u80fd\u4e0b\u964d&#xff09;\u3002<\/li>\n<li>\u63a8\u8350 CPU \u6838\u5fc3\u6570&#xff1a;\u00a0CPU\u00a0\u6838\u5fc3\u6570&#061;U\/0.7&#061;10\/0.7\u224814\u00a0\u00a0<\/li>\n<\/ul>\n<h4 style=\"background-color:transparent\">&#xff08;3&#xff09;\u4f30\u7b97\u7ebf\u7a0b\u6c60\u5927\u5c0f<\/h4>\n<p>\u5047\u8bbe&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u8bf7\u6c42\u8017\u65f6 50ms&#xff08;W&#xff09;<\/li>\n<li>\u76ee\u6807 QPS&#xff08;\u03bb&#xff09; &#061; 1000<\/li>\n<\/ul>\n<p>\u8ba1\u7b97 \u7ebf\u7a0b\u6c60\u6700\u5c0f\u5927\u5c0f&#xff08;L&#xff09;&#xff1a; L&#061;\u03bb\u00d7W&#061;1000\u00d70.05&#061;50\u00a0\u00a0<\/p>\n<p>\u7ed3\u8bba&#xff1a;<\/p>\n<ul>\n<li>\u7ebf\u7a0b\u6c60\u81f3\u5c11\u9700\u8981 50 \u4e2a\u7ebf\u7a0b&#xff08;\u5426\u5219\u8bf7\u6c42\u4f1a\u5806\u79ef&#xff09;\u3002<\/li>\n<li>\u63a8\u8350\u7ebf\u7a0b\u6c60\u5927\u5c0f&#xff1a;\n<ul>\n<li>Tomcat\/Nginx&#xff1a;max_threads &#061; 100&#xff08;\u9884\u7559\u7f13\u51b2&#xff09;<\/li>\n<li>\u6570\u636e\u5e93\u8fde\u63a5\u6c60&#xff08;\u5982 HikariCP&#xff09;&#xff1a;max_pool_size &#061; 50 &#043; 20% &#061; 60<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4 style=\"background-color:transparent\">&#xff08;4&#xff09;\u4f30\u7b97\u5185\u5b58\u9700\u6c42<\/h4>\n<p>\u5047\u8bbe&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u8bf7\u6c42\u5360\u7528\u5185\u5b58 &#061; 10MB<\/li>\n<li>\u5e76\u53d1\u8bf7\u6c42\u6570&#xff08;L&#xff09; &#061; 50<\/li>\n<\/ul>\n<p>\u8ba1\u7b97 \u5185\u5b58\u9700\u6c42&#xff1a; \u5185\u5b58&#061;L\u00d7\u5355\u8bf7\u6c42\u5185\u5b58&#061;50\u00d710&#061;500MB\u00a0\u00a0\u7ed3\u8bba&#xff1a;<\/p>\n<ul>\n<li>JVM \u5806\u5185\u5b58&#xff1a;-Xms1G -Xmx2G&#xff08;\u9884\u7559\u989d\u5916\u7a7a\u95f4&#xff09;<\/li>\n<li>\u6570\u636e\u5e93\u7f13\u5b58&#xff1a;\u82e5\u4f7f\u7528 Redis&#xff0c;\u9700\u989d\u5916\u8ba1\u7b97\u7f13\u5b58\u5360\u7528\u3002<\/li>\n<\/ul>\n<h4>&#xff08;5&#xff09;\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u8bbe\u7f6e<\/h4>\n<p>\u5047\u8bbe&#xff1a;<\/p>\n<ul>\n<li>\u6570\u636e\u5e93\u5e73\u5747\u67e5\u8be2\u65f6\u95f4 50ms&#xff08;W&#xff09;<\/li>\n<li>\u76ee\u6807 QPS&#xff08;\u03bb&#xff09; &#061; 1000<\/li>\n<\/ul>\n<p>\u8ba1\u7b97 \u8fde\u63a5\u6570\u9700\u6c42&#xff1a; \u6240\u9700\u8fde\u63a5\u6570 &#061; 1000 \u00d7 0.05 &#061; 50\u00a0\u7ed3\u8bba&#xff1a;<\/p>\n<ul>\n<li>\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u5927\u5c0f&#xff1a;50-60&#xff08;\u9884\u7559\u989d\u5916\u8fde\u63a5&#xff09;<\/li>\n<\/ul>\n<h4 style=\"background-color:transparent\">&#xff08;6&#xff09;\u4e91\u670d\u52a1\u81ea\u52a8\u6269\u7f29\u5bb9<\/h4>\n<p>\u6839\u636eLittle\u5b9a\u5f8b\u53ef\u5efa\u7acb\u52a8\u6001\u6269\u7f29\u5bb9\u7b56\u7565&#xff1a;<\/p>\n<ul>\n<li>\u76d1\u63a7\u5f53\u524dQPS\u548c\u54cd\u5e94\u65f6\u95f4<\/li>\n<li>\u5f53(\u5f53\u524dQPS \u00d7 \u54cd\u5e94\u65f6\u95f4)\u63a5\u8fd1\u5f53\u524d\u5b9e\u4f8b\u5e76\u53d1\u80fd\u529b\u4e0a\u9650\u65f6\u89e6\u53d1\u6269\u5bb9<\/li>\n<li>\u5f53\u8be5\u503c\u4f4e\u4e8e\u67d0\u4e2a\u9608\u503c\u65f6\u89e6\u53d1\u7f29\u5bb9<\/li>\n<\/ul>\n<h4 style=\"background-color:transparent\">&#xff08;7&#xff09;\u8003\u8651\u601d\u8003\u65f6\u95f4<\/h4>\n<p>\u5728\u6709\u7528\u6237\u601d\u8003\u65f6\u95f4\u7684\u4ea4\u4e92\u7cfb\u7edf\u4e2d&#xff0c;\u516c\u5f0f\u4fee\u6b63\u4e3a&#xff1a;\u5e76\u53d1\u7528\u6237\u6570 &#061; QPS \u00d7 (\u54cd\u5e94\u65f6\u95f4 &#043; \u601d\u8003\u65f6\u95f4) <\/p>\n<h4>&#xff08;8&#xff09;\u5cf0\u503c\u6d41\u91cf\u9884\u4f30<\/h4>\n<p>\u6839\u636e\u4e8c\u516b\u6cd5\u5219&#xff0c;80%\u6d41\u91cf\u5e38\u96c6\u4e2d\u572820%\u65f6\u95f4&#xff1a;\u5cf0\u503cQPS \u2248 \u65e5\u5747QPS \u00d7 0.8 \/ (24\u00d73600\u00d70.2) <\/p>\n<h4>&#xff08;9&#xff09;\u6df7\u5408\u8d1f\u8f7d\u5904\u7406<\/h4>\n<p>\u5bf9\u4e0d\u540c\u54cd\u5e94\u65f6\u95f4\u7684\u8bf7\u6c42\u7c7b\u578b\u5206\u522b\u8ba1\u7b97\u540e\u6c42\u548c&#xff1a;\u603b\u5e76\u53d1\u6570 &#061; \u03a3(QPS_i \u00d7 \u54cd\u5e94\u65f6\u95f4_i)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb860\u6b21\uff0c\u70b9\u8d5e16\u6b21\uff0c\u6536\u85cf15\u6b21\u3002\u6458\u8981\uff1aLittle\u5b9a\u5f8b\uff08L=\u03bb\u00d7W\uff09\u662f\u6392\u961f\u8bba\u4e2d\u7684\u6838\u5fc3\u516c\u5f0f\uff0c\u63ed\u793a\u4e86\u7cfb\u7edf\u5e76\u53d1\u6570\uff08L\uff09\u3001\u8bf7\u6c42\u5230\u8fbe\u7387\uff08QPS\/\u03bb\uff09\u4e0e\u54cd\u5e94\u65f6\u95f4\uff08W\/RT\uff09\u7684\u5b9a\u91cf\u5173\u7cfb\uff0c\u4e3a\u670d\u52a1\u5668\u6027\u80fd\u5206\u6790\u63d0\u4f9b\u7406\u8bba\u57fa\u7840\u3002\u901a\u8fc7\u8be5\u5b9a\u5f8b\u53ef\u8ba1\u7b97\u7ebf\u7a0b\u6c60\u89c4\u6a21\u3001\u6570\u636e\u5e93\u8fde\u63a5\u6570\u7b49\u5173\u952e\u53c2\u6570\uff0c\u6307\u5bfcCPU\u6838\u6570\u3001\u5185\u5b58\u7b49\u786c\u4ef6\u8d44\u6e90\u914d\u7f6e\u3002\u5b9e\u9645\u5e94\u7528\u4e2d\u9700\u6ce8\u610f\u5355\u4f4d\u7edf\u4e00\uff08\u6beb\u79d2\u8f6c\u79d2\uff09\u3001\u7a33\u6001\u7cfb\u7edf\u5047\u8bbe\u53ca\u7a81\u53d1\u6d41\u91cf\u7f13\u51b2\uff08\u5efa\u8bae20%-50%\u5197\u4f59\uff09\u3002\u7ed3\u5408QPS\u4e0eRT\u7684\u76f8\u4e92\u5236\u7ea6\u5173\u7cfb\uff0c\u53ef\u4f18\u5316\u7cfb\u7edf\u541e\u5410\u4e0e\u5ef6\u8fdf\uff0c\u5b9e\u73b0\u8d44\u6e90\u6210\u672c\u4e0e\u6027\u80fd\u7684\u5e73\u8861\u3002\u8be5\u5b9a\u5f8b\u9002\u7528\u4e8eWeb\u6027\u80fd\u5206\u6790\u3001\u5bb9\u91cf\u89c4\u5212\u3001\u961f\u5217\u4f18\u5316\u7b49\u573a\u666f\uff0c\u9700\u914d\u5408\u76d1\u63a7\u5de5\u5177\u52a8\u6001\u8c03\u6574\uff0c\u662f\u9ad8<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4496,58,4495,4497,644,43,78,646,44],"topic":[],"class_list":["post-47063","post","type-post","status-publish","format-standard","hentry","category-server","tag-l--x-w","tag-linux","tag-little","tag-qps","tag-644","tag-43","tag-78","tag-646","tag-44"],"yoast_head":"<!-- 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