{"id":28077,"date":"2025-04-19T22:46:24","date_gmt":"2025-04-19T14:46:24","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/28077.html"},"modified":"2025-04-19T22:46:24","modified_gmt":"2025-04-19T14:46:24","slug":"%e5%a6%82%e4%bd%95%e6%8f%90%e9%ab%98linux%e7%8e%af%e5%a2%83%e4%b8%8b%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%b9%b6%e5%8f%91%e8%bf%9e%e6%8e%a5%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/28077.html","title":{"rendered":"\u5982\u4f55\u63d0\u9ad8linux\u73af\u5883\u4e0b\u670d\u52a1\u5668\u5e76\u53d1\u8fde\u63a5\u6570"},"content":{"rendered":"

\u524d\u8a00<\/font><\/h2>\n

\u6700\u8fd1\u5b66\u4e60\u5728 linux \u73af\u5883\u4e0b\u8dd1\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u53bb\u6d4b\u8bd5\u670d\u52a1\u5668 \u5e76\u53d1\u8fde\u63a5\u6570\u91cf<\/font> \u5076\u9047\u4f17\u591a\u95ee\u9898，\u62fc\u5c3d\u5168\u529b\u65e0\u6cd5\u6218\u80dc\u3002\u56e0\u6b64\u51b3\u5b9a\u597d\u597d\u7814\u7a76\u4e00\u756a，\u4e0b\u9762\u901a\u8fc7\u4e00\u4e9b\u6211\u9047\u5230\u7684\u95ee\u9898\u5206\u4eab\u4e00\u4e0b\u6211\u662f\u5982\u4f55\u89e3\u51b3\u8fd9\u4e9b\u9519\u8bef\u8ba9\u670d\u52a1\u5668\u5e76\u53d1\u8fde\u63a5\u6570\u91cf\u4ece\u4e00\u4e24\u4e07\u8fbe\u5230\u51e0\u5341\u4e07\u7684\u3002\u53ea\u60f3\u4fee\u6539\u914d\u7f6e\u63d0\u9ad8\u5e76\u53d1\u91cf\u7684\u53ef\u4ee5\u76f4\u63a5\u4e0b\u65b9\u6216\u53f3\u4fa7\u76ee\u5f55\u8df3\u5230\u95ee\u98981，\u95ee\u98982\u3002<\/p>\n

\u5bf9\u4e86，\u6211\u7684\u8bed\u96c0\u6587\u6863\u66f4\u65b0\u4e86\u5d4c\u5165\u5f0f\u7cfb\u5217\u76f8\u5173\u7684\u7cfb\u7edf\u5b66\u4e60\u7b14\u8bb0，\u8be6\u7ec6\u4e14\u56fe\u6587\u5e76\u8302，\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60 alive\u7684\u8bed\u96c0\u6587\u6863 \u5d4c\u5165\u5f0f\u65b9\u5411\u7cfb\u5217\u7b14\u8bb0<\/p>\n<\/p>\n

\u76ee\u5f55<\/h4>\n
    \n
  • \u524d\u8a00<\/font><\/li>\n
  • \u670d\u52a1\u5668\u5de5\u4f5c\u6d41\u7a0b\u5206\u6790\u53ca\u73af\u5883\u51c6\u5907<\/font><\/li>\n
  • \n
      \n
    • \u9879\u76ee\u8fd0\u884c\u73af\u5883<\/font><\/font><\/li>\n
    • \u670d\u52a1\u5668\u5de5\u4f5c\u6d41\u7a0b<\/font><\/font><\/li>\n<\/ul>\n<\/li>\n
    • \u6027\u80fd\u74f6\u9888\u8bc6\u522b\u601d\u8def\u4ecb\u7ecd<\/font><\/li>\n
    • \n
        \n
      • 1\ufe0f\u20e3 \u5185\u5b58<\/font><\/li>\n
      • 2\ufe0f\u20e3CPU<\/font><\/li>\n
      • 3\ufe0f\u20e3\u64cd\u4f5c\u7cfb\u7edf（OS）<\/font><\/li>\n
      • 4\ufe0f\u20e3\u7f51\u5361<\/font><\/li>\n
      • 5\ufe0f\u20e3\u78c1\u76d8<\/font><\/li>\n<\/ul>\n<\/li>\n
      • \u6211\u9047\u5230\u7684\u95ee\u9898<\/li>\n
      • \n
          \n
        • \u95ee\u9898 1：Too many open files<\/li>\n
        • \u95ee\u9898 2：\u63d0\u5347\u5e76\u53d1\u6570\u91cf<\/li>\n
        • \n
            \n
          • \u7ee7\u7eed\u63d0\u5347\u5e76\u53d1\u8fde\u63a5\u5ba2\u6237\u7aef<\/li>\n
          • \n
              \n
            • 1\ufe0f\u20e3\u4f7f\u7528\u591a\u4e2a IP \u7a81\u7834\u5355 IP \u53ea\u80fd\u5e76\u53d1 6 \u4e07\u7684\u9650\u5236<\/li>\n
            • 2\ufe0f\u20e3\u8fde\u63a5\u591a\u4e2a\u670d\u52a1\u5668\u7aef\u53e3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
            • \u95ee\u9898 3：\u8fde\u63a5\u8017\u65f6\u95ee\u9898<\/li>\n
            • \u95ee\u9898 4: Bad file descriptor<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
              \n

              \u670d\u52a1\u5668\u5de5\u4f5c\u6d41\u7a0b\u5206\u6790\u53ca\u73af\u5883\u51c6\u5907<\/font><\/h2>\n

              \u9879\u76ee\u8fd0\u884c\u73af\u5883<\/font><\/font><\/h3>\n

              \u9879\u76ee\u6280\u672f\u6808<\/font><\/p>\n

                \n
              • C++\u3001epoll\u3001\u7ebf\u7a0b\u6c60 \u3001\u5185\u5b58\u6c60 tcmalloc<\/li>\n<\/ul>\n

                \u5de5\u7a0b\u8fd0\u884c\u73af\u5883<\/font><\/p>\n

                  \n
                • VirtualBox + ubuntu 22.04<\/li>\n<\/ul>\n

                  \u6a21\u5757\u5173\u7cfb\u56fe<\/font><\/p>\n

                  \"\"<\/p>\n

                  \u670d\u52a1\u5668\u5de5\u4f5c\u6d41\u7a0b<\/font><\/font><\/h3>\n

                  \u670d\u52a1\u5668\u6838\u5fc3\u5de5\u4f5c\u6d41\u7a0b\u56fe<\/font><\/p>\n

                  \"\"<\/p>\n

                  \u6211\u8fd9\u79cd \u57fa\u4e8e epoll + \u7ebf\u7a0b\u6c60<\/font> \u7684\u5e76\u53d1\u670d\u52a1\u5668\u6a21\u5f0f，\u901a\u5e38\u4e5f\u53eb\u505a \u591a\u7ebf\u7a0b<\/font> Reactor\u6a21\u578b<\/font><\/p>\n

                  \u4e0d\u6574\u8fd9\u4e9b\u9ad8\u5927\u4e0a\u7684\u540d\u8bcd，\u7b80\u5355\u6765\u8bf4\u5c31\u662f<\/p>\n

                    \n
                  • \n

                    epoll \u8d1f\u8d23 <\/font>\u4e8b\u4ef6\u76d1\u542c<\/font>\u3002<\/font><\/p>\n<\/li>\n

                  • \n

                    \u4e3b\u7ebf\u7a0b <\/font>\u8d1f\u8d23\u68c0\u6d4b I\/O \u4e8b\u4ef6<\/font> \u5e76\u5206\u53d1\u7ed9 <\/font>\u7ebf\u7a0b\u6c60<\/font> \u5904\u7406\u3002<\/font><\/p>\n<\/li>\n

                  • \n

                    \u7ebf\u7a0b\u6c60 <\/font>\u8d1f\u8d23\u6570\u636e\u8bfb\u53d6\u3001\u4e1a\u52a1\u903b\u8f91\u5904\u7406，\u5e76\u8fd4\u56de\u7ed3\u679c\u7ed9<\/font>\u5ba2\u6237\u7aef<\/font>\u3002<\/p>\n<\/li>\n<\/ul>\n

                    \u4f18\u70b9：<\/font><\/p>\n

                      \n
                    • \u5c06\u5927\u578b\u6570\u636e\u5206\u79bb\u51fa\u4e3b\u7ebf\u7a0b，\u907f\u514d I\/O \u963b\u585e\u5f71\u54cd\u4e3b\u7ebf\u7a0b<\/font>，\u53ef\u4ee5\u63d0\u5347\u5e76\u53d1\u80fd\u529b\u3002<\/li>\n
                    • \u5145\u5206\u5229\u7528\u591a\u6838 CPU<\/font>，\u7ebf\u7a0b\u6c60\u53ef\u5e76\u884c\u5904\u7406\u591a\u4e2a\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n

                      \u7f3a\u70b9：<\/font><\/p>\n

                        \n
                      • \n

                        \u7ebf\u7a0b\u5207\u6362\u6210\u672c\u9ad8<\/font>，\u8fd9\u91cc\u6d89\u53ca\u5230 CPU \u8c03\u5ea6\u7684\u95ee\u9898，\u901a\u4fd7\u70b9\u6765\u8bf4\u5c31\u662f\u5728\u4e00\u4e2a\u7a7a\u95f4\u72ed\u9698\u6750\u6599\u6709\u9650\u7684\u53a8\u623f，\u6bcf\u4e2a\u53a8\u5e08\u62a2\u7740\u540c\u4e00\u74f6\u9171\u6cb9\u5f80\u81ea\u5df1\u7684\u9505\u91cc\u5012\u8fd8\u6ca1\u5012\u5b8c\u53c8\u88ab\u5176\u4ed6\u53a8\u5e08\u62a2\u8d70\u4e86，\u5f97\u91cd\u65b0\u62a2\u56de\u6765，\u8017\u8d39\u65f6\u95f4\u3002<\/p>\n<\/li>\n

                      • \n

                        \u7ebf\u7a0b\u6c60\u91cc\u7684\u591a\u4e2a\u7ebf\u7a0b \u53ef\u80fd\u4f1a\u4e89\u62a2\u540c\u4e00\u4e2a\u8d44\u6e90<\/font>，\u901a\u4fd7\u70b9\u6765\u8bf4\u5c31\u662f\u996d\u5802\u591a\u4e2a\u5b66\u751f\u53bb\u540c\u4e00\u4e2a\u7a97\u53e3\u6253\u83dc，\u5982\u679c\u7a97\u53e3\u4e0d\u591f\u591a，\u5927\u5bb6\u90fd\u5f97\u6392\u961f，\u6548\u7387\u5c31\u4f4e\u4e86\u3002<\/p>\n<\/li>\n<\/ul>\n

                        \u6ce8\u610f：<\/font><\/p>\n

                          \n
                        • \u6211\u8fd9\u91cc\u53ea\u5bf9\u670d\u52a1\u5668\u8fdb\u884c\u5e76\u53d1\u8fde\u63a5\u6570\u91cf\u6d4b\u8bd5，\u6839\u636e\u4e0a\u9762\u7684\u4f18\u7f3a\u70b9\u5206\u6790\u53ef\u77e5，\u5355\u7ebf\u7a0b Reactor<\/font> \u5904\u7406\u5e76\u53d1\u8fde\u63a5\u4e5f\u662f\u5b8c\u5168\u53ef\u4ee5\u7684\u3002<\/li>\n
                        • \u6211\u4f7f\u7528\u8fd9\u4e2a\u5904\u7406\u65b9\u6cd5\u4ec5\u4ec5\u662f\u4e3a\u4e86\u9884\u7559\u4e07\u4e00\u4ee5\u540e\u9700\u8981\u62d3\u5c55\u5904\u7406\u5176\u4ed6\u4e1a\u52a1，\u76f4\u63a5\u62ff\u5f53\u524d\u4ee3\u7801\u62ff\u6765\u7528\u4e5f\u662f\u5f88\u4e0d\u9519\u7684\u3002<\/li>\n<\/ul>\n

                          \u4e0b\u9762\u4e5f\u62d3\u5c55\u4e00\u4e0b epoll \u5e38\u89c1\u7684 6 \u79cd\u8bbe\u8ba1\u6a21\u5f0f，\u6bcf\u79cd\u6a21\u5f0f\u5404\u6709\u4f18\u7f3a\u70b9，\u9009\u62e9\u9002\u5408\u81ea\u5df1\u7684\u5373\u53ef<\/p>\n\n\u6a21\u578b<\/font>\u7ebf\u7a0b\/\u8fdb\u7a0b<\/font>\u7279\u70b9<\/font>\u9002\u7528\u573a\u666f<\/font><\/tr>\n\n\n\n\n\n\n\n
                          \u5355\u7ebf\u7a0b Reactor<\/font><\/td>\n1 \u4e2a\u7ebf\u7a0b<\/td>\n\u9002\u7528\u4e8e\u5c0f\u578b\u5e94\u7528<\/td>\n\u4f4e\u5e76\u53d1\u670d\u52a1\u5668<\/td>\n<\/tr>\n
                          \u591a\u7ebf\u7a0b Reactor<\/font><\/td>\n\u7ebf\u7a0b\u6c60<\/td>\nepoll\u76d1\u542c，\u7ebf\u7a0b\u6c60\u5904\u7406<\/td>\n\u9ad8\u5e76\u53d1\u670d\u52a1\u5668<\/td>\n<\/tr>\n
                          \u591a\u8fdb\u7a0b Reactor<\/font><\/td>\n\u591a\u8fdb\u7a0b<\/td>\nepoll<\/font>\u76d1\u542c，\u5b50\u8fdb\u7a0b\u5904\u7406<\/td>\nWeb \u670d\u52a1\u5668（Nginx）<\/td>\n<\/tr>\n
                          \u4e3b\u4ece Reactor<\/font><\/td>\n\u4e3b\u7ebf\u7a0b + Worker（\u7ebf\u7a0b\/\u8fdb\u7a0b）<\/td>\n\u4e3b\u7ebf\u7a0b\u76d1\u542cepoll_wait()<\/font>，\u5206\u53d1\u7ed9 Worker \u5904\u7406 I\/O<\/td>\n\u9ad8\u541e\u5410\u670d\u52a1\u5668<\/td>\n<\/tr>\n
                          \u534f\u7a0b Reactor<\/font><\/td>\n\u7ebf\u7a0b + \u534f\u7a0b<\/td>\n\u4f4e\u5207\u6362\u5f00\u9500，\u9ad8\u5e76\u53d1<\/td>\n\u6e38\u620f\u670d\u52a1\u5668\u3001\u5fae\u670d\u52a1<\/td>\n<\/tr>\n
                          Proactor \u6a21\u5f0f<\/font><\/td>\n\u7ebf\u7a0b\u6c60 + \u5f02\u6b65 I\/O<\/td>\n\u4e8b\u4ef6\u9a71\u52a8，\u5185\u6838\u5b8c\u6210 I\/O<\/td>\nCDN\u3001\u5206\u5e03\u5f0f\u5b58\u50a8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                          Proactor \u6a21\u5f0f \u548c Reactor \u7684\u533a\u522b\u53ef\u4ee5\u770b\u4e0b\u9762\u6587\u7ae0<\/font><\/p>\n

                          https:\/\/zhuanlan.zhihu.com\/p\/430986475<\/p>\n

                          \u6027\u80fd\u74f6\u9888\u8bc6\u522b\u601d\u8def\u4ecb\u7ecd<\/font><\/h2>\n

                          \u5728\u8fdb\u884c\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u5f00\u53d1\u7684\u65f6\u5019，\u5f80\u5f80\u5f88\u591a\u65f6\u5019\u9047\u5230\u7684\u6027\u80fd\u95ee\u9898\u90fd\u4e0d\u662f\u81ea\u5df1\u7684\u4ee3\u7801\u539f\u56e0，\u56e0\u4e3a\u73b0\u5728\u7f51\u4e0a\u90fd\u6709\u5f88\u591a\u516c\u5171\u7684\u670d\u52a1\u5668\u4ee3\u7801\u53ef\u4ee5\u53c2\u8003\u5b66\u4e60，\u8fd9\u4e2a\u57fa\u672c\u95ee\u9898\u4e0d\u5927，\u5f53\u7136\u524d\u63d0\u662f\u4f60\u8981\u5206\u7684\u6e05\u695a\u81ea\u5df1\u7684\u4ee3\u7801\u62a5\u9519\u662f\u7531\u4e8e\u4e1a\u52a1\u903b\u8f91\u7684\u539f\u56e0\u8fd8\u662f\u6027\u80fd\u7684\u539f\u56e0\u3002<\/p>\n

                          \u5206\u6790\u6027\u80fd\u74f6\u9888\u4e00\u822c\u4ece\u4e0b\u9762\u8fd9\u4e94\u4e2a\u65b9\u5411\u5165\u624b，\u5229\u7528\u6392\u9664\u6cd5\u4e00\u4e2a\u4e00\u4e2a\u6392\u9664：<\/p>\n

                          \u5185\u5b58\u3001\u64cd\u4f5c\u7cfb\u7edf\u3001CPU\u3001\u7f51\u5361\u3001\u78c1\u76d8<\/p>\n

                          1\ufe0f\u20e3 \u5185\u5b58<\/font><\/h3>\n

                          \u9047\u5230\u548c\u5185\u5b58\u6709\u5173\u7684\u4e1c\u897f\u6211\u4eec\u901a\u5e38\u8981\u8003\u8651\u4e24\u4e2a\u95ee\u9898<\/font><\/p>\n

                            \n
                          • \u5f53\u524d\u5185\u5b58\u4f7f\u7528\u662f\u5426\u63a5\u8fd1\u4e0a\u9650？<\/li>\n
                          • \u662f\u5426\u6709 swapping \u6216\u5185\u5b58\u5206\u914d\u5ef6\u8fdf？<\/li>\n<\/ul>\n

                            \u5728\u9ad8\u5e76\u53d1\u7684\u60c5\u51b5\u4e0b\u5185\u5b58\u5bfc\u81f4\u7684\u6027\u80fd\u4e0b\u964d\u901a\u5e38\u8868\u73b0\u4e3a <\/font><\/p>\n

                              \n
                            • \u9ad8\u5e76\u53d1\u4e0b，\u6bcf\u4e2a\u8fde\u63a5\u5360\u7528\u5185\u5b58\u7d2f\u79ef，\u670d\u52a1\u5668\u6027\u80fd\u4e0b\u964d，\u54cd\u5e94\u65f6\u95f4\u53d8\u957f<\/li>\n<\/ul>\n

                              \u68c0\u67e5\u65b9\u6cd5<\/font><\/p>\n

                              free<\/span> -m
                              \n#\u67e5\u770b\u53ef\u7528\u5185\u5b58 （available）\u548c swap \u4f7f\u7528\u60c5\u51b5<\/span><\/p>\n

                              \u82e5 avaiabel \u8fc7\u4f4e\u6216\u8005 swap \u7684 used \u589e\u52a0 \u8bc1\u660e\u5185\u5b58\u4e0d\u8db3 \u4f7f\u7528\u547d\u4ee4 top\/htop \u5217\u51fa\u5360\u7528\u5185\u5b58\u6700\u9ad8\u7684\u8fdb\u7a0b \u9ad8\u5e76\u53d1\u60c5\u51b5\u4e0b\u4f18\u5148\u8003\u8651 TCP \u5efa\u7acb\u65f6\u5360\u7528\u8fc7\u591a\u5185\u5b58，\u5c1d\u8bd5\u964d\u4f4e TCP \u7684\u53d1\u9001\u7f13\u51b2\u533a\u548c\u63a5\u6536\u7f13\u51b2\u533a<\/p>\n

                              2\ufe0f\u20e3CPU<\/font><\/h3>\n

                              CPU \u6211\u4eec\u901a\u5e38\u9700\u8981\u786e\u8ba4<\/font> \u25cf CPU \u662f\u5426\u8fc7\u8f7d？ \u25cf \u662f\u5426\u7531\u521b\u5efa\u8fc7\u591a\u7ebf\u7a0b\u6216 CPU \u4e0a\u4e0b\u6587\u5207\u6362\u5f00\u9500\u5bfc\u81f4？ \u6027\u80fd\u74f6\u9888\u8868\u73b0\u4e3a<\/font> \u25cf CPU\u4f7f\u7528\u7387\u63a5\u8fd1 100%，\u4efb\u52a1\u5904\u7406\u901f\u5ea6\u53d8\u6162，\u751a\u81f3\u5bfc\u81f4\u7cfb\u7edf\u5361\u987f<\/p>\n

                              \u68c0\u67e5\u65b9\u6cd5<\/font><\/p>\n

                              top<\/span> #top\u6216 htop \u67e5\u770b CPU \u4f7f\u7528\u7387\u548c\u6bcf\u4e2a\u6838\u5fc3\u8d1f\u8f7d\u3002<\/span><\/p>\n

                              \u82e5%CPU \u6301\u7eed\u8fc7\u9ad8，\u8bf4\u660e CPU \u5360\u7528\u8fc7\u5927\u3002<\/p>\n

                              \u53ef\u80fd\u539f\u56e0:<\/font> \u7ebf\u7a0b\u6c60\u95ee\u9898\u3001\u4ee3\u7801\u6709\u4f4e\u6548\u7b97\u6cd5\u3002<\/p>\n

                              3\ufe0f\u20e3\u64cd\u4f5c\u7cfb\u7edf（OS）<\/font><\/h3>\n

                              \u64cd\u4f5c\u7cfb\u7edf\u7684\u95ee\u9898\u5c31\u6bd4\u8f83\u591a\u4e86，\u901a\u5e38\u53ef\u4ee5\u8003\u8651\u4ee5\u4e0b\u4e24\u70b9<\/font><\/p>\n

                                \n
                              • \u662f\u4e0d\u662f fd \u6570\u91cf\u4e0d\u591f\u4e86？<\/li>\n
                              • \u662f\u4e0d\u662f\u64cd\u4f5c\u7cfb\u7edf\u672c\u8eab\u9650\u5236\u4e86\u4f60\u7684\u8fde\u63a5\u6570\u91cf？<\/li>\n
                              • \u662f\u4e0d\u662f\u7aef\u53e3\u7528\u5b8c\u4e86？<\/li>\n<\/ul>\n

                                \u68c0\u67e5\u65b9\u6cd5<\/font><\/p>\n

                                ulimit<\/span> -a #\u67e5\u770b\u6587\u4ef6\u63cf\u8ff0\u7b26\u6253\u5f00\u6570\u662f\u591a\u5c11<\/span>
                                \nsysctl net.ipv4.ip_local_port_range #\u67e5\u770b\u7aef\u53e3\u8303\u56f4<\/span><\/p>\n

                                \u7aef\u53e3\u6216\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u7684\u8fc7\u5c0f\u7684\u8bdd\u53ef\u4ee5\u9002\u5f53\u8c03\u5927\u4e00\u70b9\u518d\u53bb\u6d4b\u8bd5\u662f\u4e0d\u662f\u8fd9\u4e2a\u95ee\u9898<\/p>\n

                                4\ufe0f\u20e3\u7f51\u5361<\/font><\/h3>\n

                                \u7f51\u5361\u53ef\u4ee5\u8003\u8651\u4ee5\u4e0b\u4e24\u70b9<\/font><\/p>\n

                                  \n
                                • \u662f\u5426\u5e26\u5bbd\u8fbe\u5230\u4e0a\u9650？<\/li>\n
                                • TCP \u7b49\u8fde\u63a5\u7684\u914d\u7f6e\u4f18\u5316\u6709\u6ca1\u6709\u505a\u597d<\/li>\n<\/ul>\n

                                  \u6027\u80fd\u74f6\u9888\u53ef\u8868\u73b0\u4e3a<\/font><\/p>\n

                                    \n
                                  • \u6570\u636e\u4f20\u8f93\u5ef6\u8fdf<\/li>\n
                                  • \u4e22\u5305，\u65e0\u6cd5\u521b\u5efa\u8fde\u63a5<\/li>\n<\/ul>\n

                                    \u68c0\u67e5\u65b9\u6cd5<\/font><\/p>\n

                                    sudo<\/span> iftop #\u76d1\u63a7\u5b9e\u65f6\u5e26\u5bbd<\/span>
                                    \nsysctl -w net.ipv4.tcp_tw_reuse=<\/span>1<\/span> #\u4f18\u5316TCP\u53c2\u6570<\/span><\/p>\n

                                    \u53ef\u80fd\u539f\u56e0:<\/font> \u9ad8\u5e76\u53d1\u60c5\u51b5\u4e0b\u6570\u636e\u541e\u5410\u91cf\u8d85\u8fc7\u7f51\u5361\u8d1f\u8f7d<\/p>\n

                                    5\ufe0f\u20e3\u78c1\u76d8<\/font><\/h3>\n

                                    \u5173\u4e8e\u78c1\u76d8\u6211\u4eec\u901a\u5e38\u8981\u786e\u8ba4<\/font><\/p>\n

                                      \n
                                    • \u662f\u5426\u6709\u5927\u91cf\u7684 \u6570\u636e\u5199\u5165\u64cd\u4f5c？<\/li>\n
                                    • \u78c1\u76d8\u662f\u5426\u8001\u65e7，\u6027\u80fd\u4e0d\u884c？<\/li>\n<\/ul>\n

                                      \u6027\u80fd\u74f6\u9888\u8868\u73b0\u4e3a<\/font><\/p>\n

                                        \n
                                      • \u8bfb\u5199\u64cd\u4f5c\u6162<\/li>\n<\/ul>\n

                                        \u68c0\u67e5\u65b9\u6cd5<\/p>\n

                                        iostat -x 1<\/span> #\u67e5\u770b\u78c1\u76d8 I\/O,\u5173\u6ce8 await（\u7b49\u5f85\u65f6\u95f4）\u548c %util（\u5229\u7528\u7387）<\/span><\/p>\n

                                        \u53ef\u80fd\u539f\u56e0:<\/font> \u9ad8\u5e76\u53d1\u4e0b\u60c5\u51b5\u4e0b，\u9891\u7e41\u8bfb\u5199\u6570\u636e\u5bfc\u81f4\u78c1\u76d8\u538b\u529b\u8fc7\u5927\u3002 \u89e3\u51b3\u65b9\u6cd5:<\/font> \u4f7f\u7528\u5185\u5b58\u7f13\u5b58\u6216\u66f4\u6362\u786c\u76d8<\/p>\n

                                        \u6211\u9047\u5230\u7684\u95ee\u9898<\/h2>\n

                                        \u95ee\u9898 1：Too many open files<\/h3>\n

                                        \u63cf\u8ff0：<\/font><\/p>\n

                                        \u5ba2\u6237\u7aef\u8fde\u63a5\u5230\u4e00\u5b9a\u6570\u91cf\u65f6，\u7ec8\u7aef\u51fa\u73b0 Too many open files\u3002<\/p>\n

                                        \"\"<\/p>\n

                                        \u6839\u672c\u539f\u56e0：<\/font><\/p>\n

                                        \u5728 Linux \u7cfb\u7edf\u4e2d，\u6bcf\u521b\u5efa\u4e00\u4e2a socket（\u65e0\u8bba\u662f\u670d\u52a1\u7aef\u7684\u76d1\u542c socket \u8fd8\u662f\u5ba2\u6237\u7aef\u7684\u8fde\u63a5 socket），\u64cd\u4f5c\u7cfb\u7edf\u90fd\u4f1a\u4e3a\u4e4b\u5206\u914d\u4e00\u4e2a FD\u3002\u968f\u7740\u8fde\u63a5\u6570\u589e\u52a0，FD \u6570\u91cf\u5feb\u901f\u7d2f\u79ef，\u6700\u7ec8\u8d85\u8fc7\u8fdb\u7a0b\u6216\u7cfb\u7edf\u7684\u9650\u5236，\u5bfc\u81f4\u65e0\u6cd5\u521b\u5efa\u65b0\u7684 FD，\u4ece\u800c\u89e6\u53d1\u8be5\u9519\u8bef\u3002<\/p>\n

                                        \"\"<\/p>\n

                                        \u9a8c\u8bc1：<\/font><\/p>\n

                                        ulimit<\/span> -n #\u67e5\u770b\u8fdb\u7a0b\u7ea7\u522b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236 \u9ed8\u8ba4\u4e3a1024\u8868\u793a\u6700\u591a\u53ea\u80fd\u6253\u5f001021\u4e2a，<\/span>
                                        \n #\u524d\u9762\u4e09\u4e2a\u4e3a\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u51fa\u9519<\/span>
                                        \nsysctl fs.file-max #\u67e5\u770b\u7cfb\u7edf\u7ea7\u522b\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236<\/span><\/p>\n

                                        \"\"<\/p>\n

                                        \u89e3\u51b3\u65b9\u6848：<\/font><\/p>\n

                                        1\ufe0f\u20e3\u8bbe\u7f6e\u8fdb\u7a0b\u7ea7\u522b\u6587\u4ef6\u63cf\u8ff0\u7b26\u5927\u5c0f<\/p>\n

                                        #\u4e34\u65f6\u8bbe\u7f6e，\u53ea\u5728\u5f53\u524d\u7ec8\u7aef\u751f\u6548，\u5173\u95ed\u540e\u6062\u590d\u539f\u72b6<\/span>
                                        \nulimit<\/span> -n 1048576<\/span> #\u8bbe\u7f6e\u4e3a\u6700\u5927\u503c<\/span><\/p>\n

                                        ——————————————-
                                        \n#\u6c38\u4e45\u8bbe\u7f6e<\/span>
                                        \nsudo<\/span> nano<\/span> \/etc\/security\/limits.conf <\/p>\n

                                        #\u6dfb\u52a0<\/span>
                                        \nli soft nofile 1048576<\/span> #\u7b2c\u4e00\u4e2a\u4e3a\u6211\u7684\u7528\u6237\u540d，\u8fd9\u91cc\u4fee\u6539\u6210\u4f60\u81ea\u5df1\u7684<\/span>
                                        \nli hard nofile 1048576<\/span><\/p>\n

                                        #\u6dfb\u52a0<\/span>
                                        \necho<\/span> "session required pam_limits.so"<\/span> |<\/span> sudo<\/span> tee<\/span> -a \/etc\/pam.d\/common-session
                                        \necho<\/span> "session required pam_limits.so"<\/span> |<\/span> sudo<\/span> tee<\/span> -a \/etc\/pam.d\/common-session-noninteractive<\/p>\n

                                        #\u91cd\u542f\u751f\u6548<\/span>
                                        \nsudo<\/span> reboot<\/span><\/p>\n

                                        2\ufe0f\u20e3\u4fee\u6539\u7cfb\u7edf\u7ea7\u522b\u9650\u5236<\/p>\n

                                        #\u8fdb\u5165\u4ee5\u4e0b\u6587\u4ef6<\/span>
                                        \nsudo<\/span> vi<\/span> \/etc\/sysctl.conf
                                        \n#\u6587\u4ef6\u672b\u5c3e\u6dfb\u52a0<\/span>
                                        \nfs.file-max =<\/span> 9223372036854775807<\/span>
                                        \n#\u751f\u6548<\/span>
                                        \nsudo<\/span> sysctl -p<\/p>\n

                                        \u6b64\u65f6\u8fd9\u4e2aToo many open files\u95ee\u9898\u89e3\u51b3\u3002<\/p>\n

                                        \u95ee\u9898 2：\u63d0\u5347\u5e76\u53d1\u6570\u91cf<\/h3>\n

                                        \u63cf\u8ff0：<\/font><\/p>\n

                                        \u7cfb\u7edf\u5e76\u53d1\u5230\u4e00\u5b9a\u6570\u91cf\u8fde\u63a5\u65f6\u65f6\u5019\u7a81\u7136\u65e0\u6cd5\u7ee7\u7eed\u8fde\u63a5，\u6709\u65f6\u5019\u53ef\u80fd\u4f1a\u5d29\u6389\u3002<\/p>\n

                                        \u6839\u672c\u539f\u56e0：<\/font><\/p>\n

                                        Linux \u9ed8\u8ba4\u7684\u672c\u5730\u7aef\u53e3\u8303\u56f4（net.ipv4.ip_local_port_range）\u8bbe\u7f6e\u4e3a 32768 \u5230 60999，\u5171\u7ea6 28,000 \u4e2a\u7aef\u53e3，\u56e0\u6b64\u9ed8\u8ba4\u53ea\u80fd\u5e76\u53d1 2.8 \u4e07\u5de6\u53f3\u3002<\/p>\n

                                        \u89e3\u51b3\u529e\u6cd5：<\/font><\/p>\n

                                        1\ufe0f\u20e3\u4fee\u6539 linux \u9ed8\u8ba4\u5206\u914d\u7684\u7aef\u53e3\u8303\u56f4<\/p>\n

                                        sudo<\/span> vim<\/span> \/etc\/sysctl.conf #\u4fee\u6539\u914d\u7f6e\u6587\u4ef6<\/span>
                                        \n#\u6587\u4ef6\u672b\u5c3e\u6dfb\u52a0\u7aef\u53e3\u8303\u56f4\u4e3a1024~65535，1024\u4ee5\u4e0b\u662f\u7cfb\u7edf\u9ed8\u8ba4\u4f7f\u7528\u7684<\/span>
                                        \nnet.ipv4.ip_local_port_range =<\/span> 1024<\/span> 65535<\/span> <\/p>\n

                                        #\u751f\u6548<\/span>
                                        \nsudo<\/span> sysctl -p<\/p>\n

                                        sudo<\/span> modprobe ip_conntrack<\/p>\n

                                        \"\"<\/p>\n

                                          \n
                                        • \u4fee\u6539\u5b8c\u7406\u8bba\u4e0a\u53ef\u7528\u7aef\u53e3\u6570\u4e3a 65535 – 1024 + 1 = 64,512 \u4e2a，\u5b9e\u9645\u8fde\u63a5\u6570\u8fbe\u5230 64,500 \u5de6\u53f3，\u57fa\u672c\u7b26\u5408\u9884\u671f\u3002<\/li>\n<\/ul>\n

                                          \u90a3\u4e48\u95ee\u9898\u6765\u4e86！！\u6709\u6ca1\u6709\u529e\u6cd5\u7ee7\u7eed\u63d0\u9ad8\u8fd9\u4e2a\u9650\u5236\u5462<\/font><\/p>\n

                                          \u6709\u7684，\u5144\u5f1f\u6709\u7684<\/font><\/p>\n

                                          \u7ee7\u7eed\u63d0\u5347\u5e76\u53d1\u8fde\u63a5\u5ba2\u6237\u7aef<\/h4>\n
                                          \n

                                          \u9996\u5148\u6211\u4eec\u8981\u77e5\u9053 TCP \u8fde\u63a5\u7684\u4e94\u5143\u7ec4<\/p>\n

                                            \n
                                          • \u5728 TCP \u4e2d，\u6bcf\u4e2a\u8fde\u63a5\u7531\u4e94\u5143\u7ec4\u552f\u4e00\u6807\u8bc6：\n
                                              \n
                                            • \u6e90 IP \u5730\u5740（Source IP）：<\/font>\u53d1\u9001\u65b9\u7684 IP \u5730\u5740\u3002<\/li>\n
                                            • \u6e90\u7aef\u53e3（Source Port）：<\/font>\u53d1\u9001\u65b9\u4f7f\u7528\u7684\u7aef\u53e3\u53f7\u3002<\/li>\n
                                            • \u76ee\u6807 IP \u5730\u5740（Destination IP）<\/font>x\u63a5\u6536\u65b9\u7684 IP \u5730\u5740\u3002<\/li>\n
                                            • \u76ee\u6807\u7aef\u53e3（Destination Port）：<\/font>\u63a5\u6536\u65b9\u76d1\u542c\u7684\u7aef\u53e3\u53f7\u3002<\/li>\n
                                            • \u534f\u8bae（Protocol）:<\/font>\u901a\u5e38\u662f TCP\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                              \u4f8b\u5982<\/font>，\u5f53\u5ba2\u6237\u7aef（IP \u4e3a 192.168.11.15）\u8fde\u63a5\u5230\u670d\u52a1\u5668（IP \u4e3a 192.168.11.10，\u7aef\u53e3 9999）\u65f6，\u5047\u8bbe\u5ba2\u6237\u7aef\u4f7f\u7528\u968f\u673a\u7aef\u53e3 50001，\u4e94\u5143\u7ec4\u4e3a：<\/p>\n

                                              (192.168.11.15, 50001, 192.168.11.10, 9999, TCP)<\/p>\n

                                              \u4e94\u5143\u7ec4\u7684\u6bcf\u9879\u5fc5\u987b\u552f\u4e00<\/font>，\u4ee5\u533a\u5206\u4e0d\u540c\u7684 TCP \u8fde\u63a5\u3002\u5728\u5ba2\u6237\u7aef\u53d1\u8d77\u8fde\u63a5\u7684\u573a\u666f\u4e2d，\u670d\u52a1\u5668\u7684 IP \u548c\u7aef\u53e3（192.168.11.10:9999）\u901a\u5e38\u56fa\u5b9a，\u800c\u5ba2\u6237\u7aef\u7684\u6e90 IP \u548c\u6e90\u7aef\u53e3\u5219\u53ef\u80fd\u53d8\u5316\u3002<\/font><\/p>\n

                                              \u6240\u4ee5<\/font>，\u5f53\u5ba2\u6237\u7aef\u4f7f\u7528\u5355\u4e00\u6e90 IP（\u4f8b\u5982 192.168.11.10）\u8fde\u63a5\u5230\u56fa\u5b9a\u7684\u670d\u52a1\u5668 IP \u548c\u7aef\u53e3（192.168.11.10:9999），\u4e94\u5143\u7ec4\u4e2d\u53ea\u6709\u6e90\u7aef\u53e3\u53ef\u4ee5\u53d8\u5316\u3002\u56e0\u6b64，\u8fde\u63a5\u6570\u7684\u4e0a\u9650\u53d6\u51b3\u4e8e\u53ef\u7528\u4e34\u65f6\u7aef\u53e3\u7684\u6570\u91cf：<\/font><\/p>\n

                                                \n
                                              • \u9ed8\u8ba4\u8303\u56f4\u4e0b：\u7ea6 28,000 \u4e2a\u8fde\u63a5\u3002<\/li>\n
                                              • \u6700\u5927\u8303\u56f4\u4e0b：\u7ea6 64,000 \u4e2a\u8fde\u63a5\u3002<\/li>\n<\/ul>\n
                                                \n

                                                \u89e3\u51b3\u65b9\u6848：<\/p>\n

                                                \u8981\u7a81\u7834\u8fd9\u4e00\u9650\u5236，\u6211\u4eec\u9700\u8981\u4f7f\u4e94\u5143\u7ec4\u4e2d\u7684\u67d0\u9879\u53d8\u5316，\u4ece\u800c\u521b\u5efa\u66f4\u591a\u7684\u552f\u4e00\u8fde\u63a5\u3002<\/font><\/p>\n

                                                1\ufe0f\u20e3\u4f7f\u7528\u591a\u4e2a IP \u7a81\u7834\u5355 IP \u53ea\u80fd\u5e76\u53d1 6 \u4e07\u7684\u9650\u5236<\/h5>\n

                                                \u539f\u7406：<\/font><\/p>\n

                                                \u4e94\u5143\u7ec4\u5305\u542b\u6e90 IP，\u901a\u8fc7\u4f7f\u7528\u591a\u4e2a\u6e90 IP，\u6bcf\u4e2a IP \u53ef\u4ee5\u72ec\u7acb\u4f7f\u7528\u5176\u4e34\u65f6\u7aef\u53e3\u8303\u56f4\u3002\u4f8b\u5982，\u82e5\u6bcf\u4e2a IP \u652f\u6301 60,000 \u4e2a\u8fde\u63a5，10 \u4e2a IP \u53ef\u652f\u6301 600,000 \u4e2a\u8fde\u63a5\u3002<\/p>\n

                                                \u89e3\u51b3\u65b9\u6cd5：<\/font><\/p>\n

                                                #\u4e34\u65f6\u6dfb\u52a0\u591a\u4e2a\u865a\u62df\u8fdb\u7a0b<\/span>
                                                \nsudo<\/span> ip<\/span> addr add<\/span> 127.0<\/span>.0.2\/8 dev lo
                                                \nsudo<\/span> ip<\/span> addr add<\/span> 127.0<\/span>.0.3\/8 dev lo
                                                \nsudo<\/span> ip<\/span> addr add<\/span> 127.0<\/span>.0.4\/8 dev lo
                                                \nsudo<\/span> ip<\/span> addr add<\/span> 127.0<\/span>.0.5\/8 dev lo
                                                \n..<\/span>..<\/span>..<\/span><\/p>\n

                                                —————————————–
                                                \n#\u6216\u8005\u4f7f\u7528\u4e0b\u9762\u8fd9\u53e5\u4ee3\u7801，\u4e00\u884c\u641e\u5b9a \u6dfb\u52a0\u4e86 127.0.0.2 \u5230 127.0.0.20，\u5171 19 \u4e2a\u989d\u5916 IP\u3002<\/span>
                                                \nfor<\/span> i<\/span> in<\/span> {<\/span>2<\/span>..<\/span>20<\/span>}<\/span>;<\/span> do<\/span> sudo<\/span> ip<\/span> addr add<\/span> 127.0<\/span>.0.$i<\/span>\/8 dev lo;<\/span> done<\/span>
                                                \n#\u4e0d\u662f\u56de\u73af\u5730\u5740\u4e5f\u53ef\u4ee5\u8fd9\u6837\u5b50\u8bbe\u7f6e \u8fd9\u79cd\u5f62\u5f0f\u521b\u5efa\u7684\u76f8\u5f53\u4e8e192.168.11.15\u7684\u5b50IP<\/span>
                                                \nfor<\/span> i<\/span> in<\/span> {<\/span>2<\/span>..<\/span>10<\/span>}<\/span>;<\/span> do<\/span> sudo<\/span> ip<\/span> addr add<\/span> 192.168<\/span>.11.15$i<\/span>\/32 dev enp0s3;<\/span> done<\/span>
                                                \n#\u6dfb\u52a0192.168.16 \u5230 192.168.11.30\u7684IP\u5730\u5740<\/span>
                                                \nfor<\/span> i<\/span> in<\/span> {<\/span>16<\/span>..<\/span>30<\/span>}<\/span>;<\/span> do<\/span> sudo<\/span> ip<\/span> addr add<\/span> 192.168<\/span>.11.$i<\/span>\/24 dev enp0s3;<\/span> done<\/span><\/p>\n

                                                \u8fd9\u91cc\u8981\u8bf4\u4e00\u4e0b<\/font>，\u6211\u662f\u5728\u5c40\u57df\u7f51\u8fdb\u884c\u6d4b\u8bd5，\u6709\u4e9b\u4eba\u53ef\u80fd\u4f1a\u9009\u62e9\u653e\u5728\u4e91\u5e73\u53f0\u53bb\u8dd1，\u4f46\u662f\u6d4b\u8bd5\u5e76\u53d1\u8fde\u63a5\u4e0d\u9700\u8981，\u5b9e\u9645\u6d4b\u8d77\u6765\u53ef\u80fd\u6d4b\u7684\u60f3\u5410，\u56e0\u4e3a\u7f51\u7edc\u65f6\u5ef6\u7684\u95ee\u9898\u3002\u9009\u62e9\u672c\u5730\u5c40\u57df\u7f51\u5373\u53ef，\u6211\u8fd9\u91cc\u76f4\u63a5\u4f7f\u7528\u7684\u672c\u5730\u56de\u73af\u5730\u5740\u3002<\/p>\n

                                                \u5ba2\u6237\u7aef\u5faa\u73af\u904d\u5386\u53bb\u8fde\u63a5\u8fd9\u51e0\u4e2a IP \u63d0\u5347\u5e76\u53d1\u6570\u91cf<\/p>\n

                                                #<\/span>include<\/span> <iostream><\/span><\/span>
                                                \n#<\/span>include<\/span> <sys\/socket.h><\/span><\/span>
                                                \n#<\/span>include<\/span> <arpa\/inet.h><\/span><\/span>
                                                \n#<\/span>include<\/span> <unistd.h><\/span><\/span>
                                                \n#<\/span>include<\/span> <cstring><\/span><\/span>
                                                \n#<\/span>include<\/span> <chrono><\/span><\/span>
                                                \n#<\/span>include<\/span> <vector><\/span><\/span>
                                                \nusing<\/span> namespace<\/span> std;<\/span><\/p>\n

                                                class<\/span> Client<\/span> {<\/span>
                                                \npublic<\/span>:<\/span>
                                                \nClient<\/span>(<\/span>const<\/span> string &<\/span>serverIP,<\/span> int<\/span> serverPort,<\/span> const<\/span> vector<<\/span>string><\/span> &<\/span>clientIPs)<\/span>
                                                \n:<\/span> serverIP_<\/span>(<\/span>serverIP)<\/span>,<\/span> serverPort_<\/span>(<\/span>serverPort)<\/span>,<\/span> clientIPs_<\/span>(<\/span>clientIPs)<\/span>,<\/span> ipIndex_<\/span>(<\/span>0<\/span>)<\/span> {<\/span>}<\/span><\/p>\n

                                                ~<\/span>Client<\/span>(<\/span>)<\/span> {<\/span>
                                                \n for<\/span> (<\/span>int<\/span> sock :<\/span> sockets_)<\/span> {<\/span>
                                                \n close<\/span>(<\/span>sock)<\/span>;<\/span>
                                                \n }<\/span>
                                                \n}<\/span><\/p>\n

                                                void<\/span> run<\/span>(<\/span>)<\/span> {<\/span>
                                                \n int<\/span> count =<\/span> 0<\/span>;<\/span>
                                                \n auto<\/span> lastReportTime =<\/span> chrono::<\/span>steady_clock::<\/span>now<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                                                while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
                                                \n string localIP =<\/span> clientIPs_[<\/span>ipIndex_ %<\/span> clientIPs_.<\/span>size<\/span>(<\/span>)<\/span>]<\/span>;<\/span>
                                                \n ipIndex_++<\/span>;<\/span><\/p>\n

                                                int<\/span> sock =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span>
                                                \n if<\/span> (<\/span>sock <<\/span> 0<\/span>)<\/span> {<\/span>
                                                \n perror<\/span>(<\/span>"\u521b\u5efa sock \u5931\u8d25"<\/span>)<\/span>;<\/span>
                                                \n continue<\/span>;<\/span>
                                                \n }<\/span><\/p>\n

                                                struct<\/span> sockaddr_in<\/span> localAddr;<\/span>
                                                \n memset<\/span>(<\/span>&<\/span>localAddr,<\/span> 0<\/span>,<\/span> sizeof<\/span>(<\/span>localAddr)<\/span>)<\/span>;<\/span>
                                                \n localAddr.<\/span>sin_family =<\/span> AF_INET;<\/span>
                                                \n localAddr.<\/span>sin_port =<\/span> 0<\/span>;<\/span>
                                                \n inet_pton<\/span>(<\/span>AF_INET,<\/span> localIP.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> &<\/span>localAddr.<\/span>sin_addr)<\/span>;<\/span>
                                                \n if<\/span> (<\/span>bind<\/span>(<\/span>sock,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>localAddr,<\/span> sizeof<\/span>(<\/span>localAddr)<\/span>)<\/span> <<\/span> 0<\/span>)<\/span> {<\/span>
                                                \n perror<\/span>(<\/span>"bind \u9519\u8bef"<\/span>)<\/span>;<\/span>
                                                \n close<\/span>(<\/span>sock)<\/span>;<\/span>
                                                \n continue<\/span>;<\/span>
                                                \n }<\/span><\/p>\n

                                                struct<\/span> sockaddr_in<\/span> serverAddr;<\/span>
                                                \n memset<\/span>(<\/span>&<\/span>serverAddr,<\/span> 0<\/span>,<\/span> sizeof<\/span>(<\/span>serverAddr)<\/span>)<\/span>;<\/span>
                                                \n serverAddr.<\/span>sin_family =<\/span> AF_INET;<\/span>
                                                \n serverAddr.<\/span>sin_port =<\/span> htons<\/span>(<\/span>serverPort_)<\/span>;<\/span>
                                                \n inet_pton<\/span>(<\/span>AF_INET,<\/span> serverIP_.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> &<\/span>serverAddr.<\/span>sin_addr)<\/span>;<\/span>
                                                \n if<\/span> (<\/span>connect<\/span>(<\/span>sock,<\/span> (<\/span>struct<\/span> sockaddr<\/span>*<\/span>)<\/span>&<\/span>serverAddr,<\/span> sizeof<\/span>(<\/span>serverAddr)<\/span>)<\/span> <<\/span> 0<\/span>)<\/span> {<\/span>
                                                \n perror<\/span>(<\/span>"connect \u9519\u8bef"<\/span>)<\/span>;<\/span>
                                                \n close<\/span>(<\/span>sock)<\/span>;<\/span>
                                                \n continue<\/span>;<\/span>
                                                \n }<\/span><\/p>\n

                                                sockets_.<\/span>push_back<\/span>(<\/span>sock)<\/span>;<\/span>
                                                \n count++<\/span>;<\/span><\/p>\n

                                                if<\/span> (<\/span>count %<\/span> 999<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span>
                                                \n auto<\/span> now =<\/span> chrono::<\/span>steady_clock::<\/span>now<\/span>(<\/span>)<\/span>;<\/span>
                                                \n auto<\/span> duration =<\/span> chrono::<\/span>duration_cast<<\/span>chrono::<\/span>milliseconds><\/span>(<\/span>now –<\/span> lastReportTime)<\/span>.<\/span>count<\/span>(<\/span>)<\/span>;<\/span>
                                                \n lastReportTime =<\/span> now;<\/span>
                                                \n string message =<\/span> "\u5f53\u524d\u8fde\u63a5\u6570\u91cf: "<\/span> +<\/span> to_string<\/span>(<\/span>count)<\/span> +<\/span>
                                                \n ", clientIP: "<\/span> +<\/span> localIP +<\/span>
                                                \n ", clientFD: "<\/span> +<\/span> to_string<\/span>(<\/span>sock)<\/span> +<\/span>
                                                \n ", timeuse: "<\/span> +<\/span> to_string<\/span>(<\/span>duration)<\/span> +<\/span> "ms"<\/span>;<\/span>
                                                \n ssize_t n =<\/span> write<\/span>(<\/span>sock,<\/span> message.<\/span>c_str<\/span>(<\/span>)<\/span>,<\/span> message.<\/span>size<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                                \n if<\/span> (<\/span>n <<\/span> 0<\/span>)<\/span> {<\/span>
                                                \n perror<\/span>(<\/span>"\u53d1\u9001\u5931\u8d25"<\/span>)<\/span>;<\/span>
                                                \n }<\/span> else<\/span> {<\/span>
                                                \n char<\/span> buffer[<\/span>1024<\/span>]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span>
                                                \n n =<\/span> read<\/span>(<\/span>sock,<\/span> buffer,<\/span> sizeof<\/span>(<\/span>buffer)<\/span> –<\/span> 1<\/span>)<\/span>;<\/span>
                                                \n if<\/span> (<\/span>n ><\/span> 0<\/span>)<\/span> {<\/span>
                                                \n buffer[<\/span>n]<\/span> =<\/span> '\\\\0'<\/span>;<\/span>
                                                \n cout <<<\/span> "\u670d\u52a1\u5668\u8fd4\u56de: "<\/span> <<<\/span> buffer <<<\/span> endl;<\/span>
                                                \n }<\/span>
                                                \n }<\/span>
                                                \n }<\/span>
                                                \n }<\/span>
                                                \n}<\/span><\/p>\n

                                                private<\/span>:<\/span>
                                                \nstring serverIP_;<\/span>
                                                \nint<\/span> serverPort_;<\/span>
                                                \nvector<<\/span>string><\/span> clientIPs_;<\/span>
                                                \nsize_t ipIndex_;<\/span>
                                                \nvector<<\/span>int<\/span>><\/span> sockets_;<\/span>
                                                \n}<\/span>;<\/span><\/p>\n

                                                int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
                                                \n \/\/ \u914d\u7f6e 10 \u4e2a\u865a\u62df IP<\/span>
                                                \n vector<<\/span>string><\/span> clientIPs =<\/span> {<\/span>
                                                \n "127.0.0.1"<\/span>,<\/span> "127.0.0.2"<\/span>,<\/span> "127.0.0.3"<\/span>,<\/span> "127.0.0.4"<\/span> \/\/\u53ef\u4ee5\u7ee7\u7eed\u586b\u5199\u5269\u4f59IP<\/span>
                                                \n }<\/span>;<\/span>
                                                \n Client client<\/span>(<\/span>"127.0.0.1"<\/span>,<\/span> 9999<\/span>,<\/span> clientIPs)<\/span>;<\/span>
                                                \n client.<\/span>run<\/span>(<\/span>)<\/span>;<\/span>
                                                \n return<\/span> 0<\/span>;<\/span>
                                                \n}<\/span><\/p>\n

                                                \u9a8c\u8bc1<\/font><\/p>\n

                                                \"\"<\/p>\n

                                                  \n
                                                • \u591a\u4e2a IP \u5e76\u53d1\u8fde\u63a5\u8f7b\u677e\u7a81\u7834\u5355\u4e2a 6 \u4e07\u7684\u9650\u5236<\/li>\n<\/ul>\n
                                                  2\ufe0f\u20e3\u8fde\u63a5\u591a\u4e2a\u670d\u52a1\u5668\u7aef\u53e3<\/h5>\n

                                                  \u539f\u7406：<\/font><\/p>\n

                                                  \u4e94\u5143\u7ec4\u5176\u4ed6\u56db\u9879\u56fa\u5b9a，\u670d\u52a1\u5668 IP \u662f\u53d8\u5316\u7684，\u90a3\u4e48\u5ba2\u6237\u7aef\u53ef\u4ee5\u8fde\u63a5\u5230\u4e0d\u540c\u7684\u76ee\u6807\u7aef\u53e3，\u6bcf\u4e2a\u7aef\u53e3\u652f\u6301\u72ec\u7acb\u7684 60,000 \u4e2a\u8fde\u63a5\u3002<\/p>\n

                                                  \u89e3\u51b3\u65b9\u6cd5：<\/font><\/p>\n

                                                  \u670d\u52a1\u5668\u76d1\u542c\u591a\u4e2a\u7aef\u53e3，\u5c06\u591a\u4e2a\u7aef\u53e3\u6dfb\u52a0\u5230\u540c\u4e00\u4e2aepoll\u5373\u53ef，\u65e0\u9700\u591a\u4e2aepoll，\u8be6\u7ec6\u6b65\u9aa4\u5c31\u4e0d\u5217\u51fa\u6765\u4e86\u56e0\u4e3a\u6211\u6ca1\u5199\u54c8\u54c8\u3002<\/p>\n

                                                  \u95ee\u9898 3：\u8fde\u63a5\u8017\u65f6\u95ee\u9898<\/h3>\n

                                                  \u63cf\u8ff0：<\/font><\/p>\n

                                                  \u5f53\u8fde\u63a5\u6570\u91cf\u53d8\u591a\u7684\u65f6\u5019\u4ece\u6700\u5f00\u59cb\u6bcf 1000 \u4e2a\u8fde\u63a5\u7528\u65f6 \u51e0\u5341\u6beb\u79d2\u5927\u5927\u589e\u52a0\u5230\u4e0a\u5343\u751a\u81f3\u4e0a\u4e07\u6beb\u79d2<\/p>\n

                                                  \"\"<\/p>\n

                                                  \u6839\u672c\u539f\u56e0：<\/font><\/p>\n

                                                    \n
                                                  • \u9996\u5148\u6392\u9664\u6587\u4ef6\u63cf\u8ff0\u7b26\u63a5\u8fd1\u4e0a\u9650\u7684\u539f\u56e0，\u5728\u524d\u9762\u7684\u8bbe\u7f6e\u4e2d\u5df2\u7ecf\u8bbe\u7f6e\u4e86\u975e\u5e38\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u8fd9\u624d\u51e0\u5341\u4e07\u8fde\u63a5\u4e0d\u4f1a\u8fbe\u5230\u4e0a\u9650<\/li>\n
                                                  • \u6bcf\u4e2a\u8fde\u63a5\u9700\u8981\u5185\u5b58\u6765\u5b58\u50a8\u5957\u63a5\u5b57\u7f13\u51b2\u533a\u3001TCP \u63a7\u5236\u5757\u7b49，\u968f\u7740\u8fde\u63a5\u6570\u589e\u52a0，\u5185\u5b58\u4f7f\u7528\u91cf\u589e\u5927，\u7cfb\u7edf\u53ef\u80fd\u5f00\u59cb\u4f7f\u7528\u4ea4\u6362\u7a7a\u95f4（swap）\u6216\u5185\u5b58\u5206\u914d\u53d8\u6162\u3002<\/li>\n<\/ul>\n

                                                    \u56e0\u6b64<\/font>\u6211\u4eec\u4ece\u4f18\u5316\u5185\u5b58\u7684\u601d\u8def\u53bb\u89e3\u51b3\u95ee\u9898，\u4e8e\u6211\u7684\u9879\u76ee\u800c\u8a00\u6211\u9700\u8981\u8bbe\u7f6e TCP \u7f13\u51b2\u533a\u5927\u5c0f<\/p>\n

                                                    \u89e3\u51b3\u601d\u8def<\/font><\/p>\n

                                                    1\ufe0f\u20e3\u4f18\u5316\u5957\u63a5\u5b57\u7f13\u51b2\u533a<\/p>\n

                                                    int<\/span> bufsize =<\/span> 4096<\/span>;<\/span>\/\/TCP\u5efa\u7acb\u8fde\u63a5\u7684\u65f6\u5019\u8bbe\u7f6e\u66f4\u5c11\u7684\u7f13\u51b2\u533a<\/span>
                                                    \nsetsockopt<\/span>(<\/span>sock,<\/span> SOL_SOCKET,<\/span> SO_SNDBUF,<\/span> &<\/span>bufsize,<\/span> sizeof<\/span>(<\/span>bufsize)<\/span>)<\/span>;<\/span>
                                                    \nsetsockopt<\/span>(<\/span>sock,<\/span> SOL_SOCKET,<\/span> SO_RCVBUF,<\/span> &<\/span>bufsize,<\/span> sizeof<\/span>(<\/span>bufsize)<\/span>)<\/span>;<\/span><\/p>\n

                                                    2\ufe0f\u20e3\u4fee\u6539 linux \u672c\u5730\u914d\u7f6e<\/p>\n

                                                    sudo<\/span> vim<\/span> \/etc\/sysctl.conf
                                                    \n#\u4e0b\u9762\u51e0\u4e2a\u662f\u7cfb\u7edf\u9ed8\u8ba4\u7684，\u53ef\u4ee5\u4fee\u6539\u4e3a\u66f4\u5927\u7684\u503c<\/span>
                                                    \nnet.ipv4.tcp_mem =<\/span> 262144<\/span> 524288<\/span> 786432<\/span> #524288 1048576 1572864 \u4fee\u6539\u4e3a\u66f4\u5927\u7684\u503c<\/span>
                                                    \nnet.ipv4.tcp_wmem =<\/span> 2048<\/span> 2048<\/span> 4096<\/span>
                                                    \nnet.ipv4.tcp_rmem =<\/span> 2048<\/span> 2048<\/span> 4096<\/span>
                                                    \nnet.nf_conntrack_max =<\/span> 1048576<\/span><\/p>\n

                                                    net.ipv4.tcp_mem = 262144 524288 786432<\/p>\n

                                                      \n
                                                    • \u63a7\u5236\u5168\u5c40 TCP \u5185\u5b58\u4f7f\u7528，\u5355\u4f4d\u662f\u9875\u9762\u5927\u5c0f（\u901a\u5e38 4KB），\u6709\u4e09\u4e2a\u503c：\n
                                                        \n
                                                      • 262144：<\/font>\u4f4e\u9608\u503c，\u4f4e\u4e8e\u6b64\u503c\u65f6\u4e0d\u9650\u5236\u5185\u5b58\u4f7f\u7528（\u7ea6 1GB）\u3002<\/li>\n
                                                      • 524288：<\/font>\u538b\u529b\u9608\u503c，\u8fbe\u5230\u6b64\u503c\u65f6\u5f00\u59cb\u9650\u5236\u65b0\u8fde\u63a5\u5185\u5b58（\u7ea6 2GB）\u3002<\/li>\n
                                                      • 786432：<\/font>\u6700\u5927\u9608\u503c，\u4e0a\u9650\u5185\u5b58\u91cf，\u8d85\u51fa\u53ef\u80fd\u4e22\u5305（\u7ea6 3GB）\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                        net.ipv4.tcp_wmem = 2048 2048 4096TCP \u53d1\u9001\u7f13\u51b2\u533a\u5927\u5c0f（\u5355\u4f4d：\u5b57\u8282）<\/p>\n

                                                        net.ipv4.tcp_rmem = 2048 2048 4096TCP \u63a5\u6536\u7f13\u51b2\u533a\u5927\u5c0f（\u5355\u4f4d：\u5b57\u8282）<\/p>\n

                                                        \u56e0\u6b64<\/font>，\u53ea\u9700\u8981\u5c06tcp_mem\u8bbe\u7f6e\u4e3a\u66f4\u5927\u503c\u5373\u53ef\u964d\u4f4e\u8fde\u63a5\u8017\u65f6，\u5982\u4e0b，30 \u591a\u4e07\u540e\u6bcf\u4e00\u5343\u8fde\u63a5\u8017\u65f6\u6bd4\u4e4b\u524d\u964d\u4f4e\u5f88\u591a<\/p>\n

                                                        \"\"<\/p>\n

                                                        \u95ee\u9898 4: Bad file descriptor<\/h3>\n

                                                        \u63cf\u8ff0：<\/font><\/p>\n

                                                        \u5ba2\u6237\u7aef\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u65f6，\u7ec8\u7aef\u51fa\u73b0 epoll_ctl \u79fb\u9664fd\u5931\u8d25: Bad file descriptor\u3002<\/p>\n

                                                        \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                                                        \u573a\u666f：<\/font><\/p>\n

                                                        \u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5904\u7406\u540c\u4e00\u4e2a clientFD，\u4e00\u4e2a\u7ebf\u7a0b\u5173\u95ed fd \u540e，\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u5c1d\u8bd5\u64cd\u4f5c\u5df2\u5173\u95ed\u7684 fd\u3002<\/p>\n

                                                        \u6839\u672c\u539f\u56e0：<\/font><\/p>\n

                                                        \u6211\u7684\u4ee3\u7801\u903b\u8f91\u662f while \u5faa\u73af\u68c0\u6d4b\u5206\u914d\u4e8b\u4ef6，\u5982\u679c\u662f\u5ba2\u6237\u7aef\u6709\u6570\u636e\u7684\u8bdd\u5c31\u4ea4\u7ed9\u5de5\u4f5c\u7ebf\u7a0b\u53bb\u5904\u7406，\u4e5f\u5c31\u662f\u8c03\u7528\u7ebf\u7a0b\u6c60\u53bb\u63a5\u53d7\u5904\u7406\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\u3002\u8fd9\u5c31\u5bfc\u81f4\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f（EPOLLET）\u4e0b，epoll_wait \u53ef\u80fd\u591a\u6b21\u8fd4\u56de\u540c\u4e00 fd，\u5bfc\u81f4\u591a\u4e2a\u7ebf\u7a0b\u4f7f\u7528\u540c\u4e00\u4e2a clientfd \u5904\u7406\u5e76\u53d1\u51b2\u7a81\u3002<\/p>\n

                                                        \u89e3\u51b3\u65b9\u6848：<\/font><\/p>\n

                                                          \n
                                                        • \u4f7f\u7528 EPOLLONESHOT，\u786e\u4fdd fd \u5728\u89e6\u53d1\u4e8b\u4ef6\u540e\u7981\u7528：\n
                                                            \n
                                                          • \u5728 Epoll::addClientFD \u4e2d\u8bbe\u7f6e EPOLLIN | EPOLLONESHOT\u3002<\/li>\n
                                                          • \u6dfb\u52a0 rearm \u65b9\u6cd5\u91cd\u65b0\u542f\u7528 fd\u3002<\/li>\n
                                                          • \u5728 readFromClient \u5904\u7406\u5b8c\u6210\u540e\u8c03\u7528 rearm（\u5982\u679c\u5ba2\u6237\u7aef\u8fde\u63a5\u672a\u5173\u95ed）\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                            epoll.cpp<\/p>\n

                                                            \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" server.cpp \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

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