{"id":3845,"date":"2021-04-10T23:19:43","date_gmt":"2021-04-10T15:19:43","guid":{"rendered":"http:\/\/blog.coolcoding.cn\/?p=3845"},"modified":"2021-04-10T23:23:04","modified_gmt":"2021-04-10T15:23:04","slug":"%e6%9e%84%e5%bb%bac1000k%e7%9a%84%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/blog.coolcoding.cn\/?p=3845","title":{"rendered":"\u6784\u5efaC1000K\u7684\u670d\u52a1\u5668"},"content":{"rendered":"\n

[\u8f6c]http:\/\/www.ideawu.net\/blog\/archives\/740.html<\/p>\n\n\n\n

\u8457\u540d\u7684 C10K \u95ee\u9898<\/a>\u63d0\u51fa\u7684\u65f6\u5019, \u6b63\u662f 2001 \u5e74, \u5230\u5982\u4eca 12 \u5e74\u540e\u7684 2013 \u5e74, C10K \u5df2\u7ecf\u4e0d\u662f\u95ee\u9898\u4e86, \u4efb\u4f55\u4e00\u4e2a\u666e\u901a\u7684\u7a0b\u5e8f\u5458, \u90fd\u80fd\u5229\u7528\u624b\u8fb9\u7684\u8bed\u8a00\u548c\u5e93, \u8f7b\u677e\u5730\u5199\u51fa C10K \u7684\u670d\u52a1\u5668. \u8fd9\u65e2\u5f97\u76ca\u4e8e\u8f6f\u4ef6\u7684\u8fdb\u6b65, \u4e5f\u5f97\u76ca\u4e8e\u786c\u4ef6\u6027\u80fd\u7684\u63d0\u9ad8.<\/p>\n\n\n\n

\u73b0\u5728, \u8be5\u662f\u8003\u8651\u00a0C1000K, \u4e5f\u5c31\u662f\u767e\u4e07\u8fde\u63a5\u7684\u95ee\u9898\u7684\u65f6\u5019\u4e86. \u50cf Twitter, weibo, Facebook \u8fd9\u4e9b\u7f51\u7ad9, \u5b83\u4eec\u7684\u540c\u65f6\u5728\u7ebf\u7528\u6237\u6709\u4e0a\u5343\u4e07, \u540c\u65f6\u53c8\u5e0c\u671b\u6d88\u606f\u80fd\u63a5\u8fd1\u5b9e\u65f6\u5730\u63a8\u9001\u7ed9\u7528\u6237, \u8fd9\u5c31\u9700\u8981\u670d\u52a1\u5668\u80fd\u7ef4\u6301\u548c\u4e0a\u5343\u4e07\u7528\u6237\u7684 TCP \u7f51\u7edc\u8fde\u63a5, \u867d\u7136\u53ef\u4ee5\u4f7f\u7528\u6210\u767e\u4e0a\u5343\u53f0\u670d\u52a1\u5668\u6765\u652f\u6491\u8fd9\u4e48\u591a\u7528\u6237, \u4f46\u5982\u679c\u6bcf\u53f0\u670d\u52a1\u5668\u80fd\u652f\u6301\u4e00\u767e\u4e07\u8fde\u63a5(C1000K), \u90a3\u4e48\u53ea\u9700\u8981\u5341\u53f0\u670d\u52a1\u5668.<\/p>\n\n\n\n

\u6709\u5f88\u591a\u6280\u672f\u58f0\u79f0\u80fd\u89e3\u51b3\u00a0C1000K\u00a0\u95ee\u9898, \u4f8b\u5982 Erlang, Java NIO \u7b49\u7b49, \u4e0d\u8fc7, \u6211\u4eec\u5e94\u8be5\u9996\u5148\u5f04\u660e\u767d, \u4ec0\u4e48\u56e0\u7d20\u9650\u5236\u4e86 C1000K \u95ee\u9898\u7684\u89e3\u51b3. \u4e3b\u8981\u662f\u8fd9\u51e0\u70b9:<\/p>\n\n\n\n

  1. \u64cd\u4f5c\u7cfb\u7edf\u80fd\u5426\u652f\u6301\u767e\u4e07\u8fde\u63a5?<\/li>
  2. \u64cd\u4f5c\u7cfb\u7edf\u7ef4\u6301\u767e\u4e07\u8fde\u63a5\u9700\u8981\u591a\u5c11\u5185\u5b58?<\/li>
  3. \u5e94\u7528\u7a0b\u5e8f\u7ef4\u6301\u767e\u4e07\u8fde\u63a5\u9700\u8981\u591a\u5c11\u5185\u5b58?<\/li>
  4. \u767e\u4e07\u8fde\u63a5\u7684\u541e\u5410\u91cf\u662f\u5426\u8d85\u8fc7\u4e86\u7f51\u7edc\u9650\u5236?<\/li><\/ol>\n\n\n\n

    \u4e0b\u9762\u6765\u5206\u522b\u5bf9\u8fd9\u51e0\u4e2a\u95ee\u9898\u8fdb\u884c\u5206\u6790.<\/p>\n\n\n\n

    1. \u64cd\u4f5c\u7cfb\u7edf\u80fd\u5426\u652f\u6301\u767e\u4e07\u8fde\u63a5?<\/h3>\n\n\n\n

    \u5bf9\u4e8e\u7edd\u5927\u90e8\u5206\u00a0Linux\u00a0\u64cd\u4f5c\u7cfb\u7edf, \u9ed8\u8ba4\u60c5\u51b5\u4e0b\u786e\u5b9e\u4e0d\u652f\u6301 C1000K! \u56e0\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u5305\u542b\u6700\u5927\u6253\u5f00\u6587\u4ef6\u6570(Max Open Files)\u9650\u5236, \u5206\u4e3a\u7cfb\u7edf\u5168\u5c40\u7684, \u548c\u8fdb\u7a0b\u7ea7\u7684\u9650\u5236.<\/p>\n\n\n\n

    \u5168\u5c40\u9650\u5236<\/h4>\n\n\n\n

    \u5728 Linux \u4e0b\u6267\u884c:<\/p>\n\n\n\n

    cat \/proc\/sys\/fs\/file-nr\n<\/pre>\n\n\n\n
    \u4f1a\u6253\u5370\u51fa\u7c7b\u4f3c\u4e0b\u9762\u7684\u4e00\u884c\u8f93\u51fa:<\/p>\n\n\n\n
    5100\t0\t101747\n<\/pre>\n\n\n\n
    \u7b2c\u4e09\u4e2a\u6570\u5b57 101747<\/code> \u5c31\u662f\u5f53\u524d\u7cfb\u7edf\u7684\u5168\u5c40\u6700\u5927\u6253\u5f00\u6587\u4ef6\u6570(Max Open Files), \u53ef\u4ee5\u770b\u5230, \u53ea\u6709 10 \u4e07, \u6240\u4ee5, \u5728\u8fd9\u53f0\u670d\u52a1\u5668\u4e0a\u65e0\u6cd5\u652f\u6301 C1000K. \u5f88\u591a\u7cfb\u7edf\u7684\u8fd9\u4e2a\u6570\u503c\u66f4\u5c0f, \u4e3a\u4e86\u4fee\u6539\u8fd9\u4e2a\u6570\u503c, \u7528 root \u6743\u9650\u4fee\u6539 \/etc\/sysctl.conf \u6587\u4ef6:<\/p>\n\n\n\n
    fs.file-max = 1020000\nnet.ipv4.ip_conntrack_max = 1020000\nnet.ipv4.netfilter.ip_conntrack_max = 1020000\n<\/pre>\n\n\n\n
    \u9700\u8981\u91cd\u542f\u7cfb\u7edf\u670d\u52a1\u751f\u6548:<\/p>\n\n\n\n
    # Linux\n$ sudo sysctl -p \/etc\/sysctl.conf \n# BSD\n$ sudo \/etc\/rc.d\/sysctl reload\n<\/pre>\n\n\n\n
    \u8fdb\u7a0b\u9650\u5236<\/h3>\n\n\n\n
    \u6267\u884c:<\/p>\n\n\n\n
    ulimit -n\n<\/pre>\n\n\n\n
    \u8f93\u51fa:<\/p>\n\n\n\n
    1024\n<\/pre>\n\n\n\n
    \u8bf4\u660e\u5f53\u524d Linux \u7cfb\u7edf\u7684\u6bcf\u4e00\u4e2a\u8fdb\u7a0b\u53ea\u80fd\u6700\u591a\u6253\u5f00 1024 \u4e2a\u6587\u4ef6. \u4e3a\u4e86\u652f\u6301 C1000K, \u4f60\u540c\u6837\u9700\u8981\u4fee\u6539\u8fd9\u4e2a\u9650\u5236.<\/p>\n\n\n\n
    \u4e34\u65f6\u4fee\u6539<\/strong><\/p>\n\n\n\n
    ulimit -n 1020000\n<\/pre>\n\n\n\n
    \u4e0d\u8fc7, \u5982\u679c\u4f60\u4e0d\u662f root, \u53ef\u80fd\u4e0d\u80fd\u4fee\u6539\u8d85\u8fc7 1024, \u4f1a\u62a5\u9519:<\/p>\n\n\n\n
    -bash: ulimit: open files: cannot modify limit: Operation not permitted\n<\/pre>\n\n\n\n
    \u6c38\u4e45\u4fee\u6539<\/strong><\/p>\n\n\n\n
    \u7f16\u8f91 \/etc\/security\/limits.conf \u6587\u4ef6, \u52a0\u5165\u5982\u4e0b\u884c:<\/p>\n\n\n\n
    # \/etc\/security\/limits.conf\nwork         hard    nofile      1020000\nwork         soft    nofile      1020000\n<\/pre>\n\n\n\n
    \u7b2c\u4e00\u5217\u7684 work<\/code> \u8868\u793a work \u7528\u6237, \u4f60\u53ef\u4ee5\u586b *<\/code>, \u6216\u8005 root<\/code>. \u7136\u540e\u4fdd\u5b58\u9000\u51fa, \u91cd\u65b0\u767b\u5f55\u670d\u52a1\u5668.<\/p>\n\n\n\n
    \u6ce8\u610f: Linux \u5185\u6838\u6e90\u7801\u4e2d\u6709\u4e00\u4e2a\u5e38\u91cf(NR_OPEN in \/usr\/include\/linux\/fs.h), \u9650\u5236\u4e86\u6700\u5927\u6253\u5f00\u6587\u4ef6\u6570, \u5982 RHEL 5 \u662f 1048576(2^20), \u6240\u4ee5, \u8981\u60f3\u652f\u6301\u00a0C1000K, \u4f60\u53ef\u80fd\u8fd8\u9700\u8981\u91cd\u65b0\u7f16\u8bd1\u5185\u6838.<\/p>\n\n\n\n
    2. \u64cd\u4f5c\u7cfb\u7edf\u7ef4\u6301\u767e\u4e07\u8fde\u63a5\u9700\u8981\u591a\u5c11\u5185\u5b58?<\/h3>\n\n\n\n
    \u89e3\u51b3\u4e86\u64cd\u4f5c\u7cfb\u7edf\u7684\u53c2\u6570\u9650\u5236, \u63a5\u4e0b\u6765\u5c31\u8981\u770b\u770b\u5185\u5b58\u7684\u5360\u7528\u60c5\u51b5. \u9996\u5148, \u662f\u64cd\u4f5c\u7cfb\u7edf\u672c\u8eab\u7ef4\u62a4\u8fd9\u4e9b\u8fde\u63a5\u7684\u5185\u5b58\u5360\u7528. \u5bf9\u4e8e Linux \u64cd\u4f5c\u7cfb\u7edf, socket(fd) \u662f\u4e00\u4e2a\u6574\u6570, \u6240\u4ee5, \u731c\u60f3\u64cd\u4f5c\u7cfb\u7edf\u7ba1\u7406\u4e00\u767e\u4e07\u4e2a\u8fde\u63a5\u6240\u5360\u7528\u7684\u5185\u5b58\u5e94\u8be5\u662f 4M\/8M, \u518d\u5305\u62ec\u4e00\u4e9b\u7ba1\u7406\u4fe1\u606f, \u5e94\u8be5\u4f1a\u662f 100M \u5de6\u53f3. \u4e0d\u8fc7, \u8fd8\u6709 socket \u53d1\u9001\u548c\u63a5\u6536\u7f13\u51b2\u533a\u6240\u5360\u7528\u7684\u5185\u5b58\u6ca1\u6709\u5206\u6790. \u4e3a\u6b64, \u6211\u5199\u4e86\u6700\u539f\u59cb\u7684 C \u7f51\u7edc\u7a0b\u5e8f\u6765\u9a8c\u8bc1:<\/p>\n\n\n\n
    \u670d\u52a1\u5668<\/h4>\n\n\n\n
    #include <stdio.h>\n#include <stdlib.h>\n#include <string.h>\n#include <unistd.h>\n#include <errno.h>\n#include <arpa\/inet.h>\n#include <netinet\/tcp.h>\n#include <sys\/select.h>\n\n#define MAX_PORTS 10\n\nint main(int argc, char **argv){\n    struct sockaddr_in addr;\n    const char *ip = \"0.0.0.0\";\n    int opt = 1;\n    int bufsize;\n    socklen_t optlen;\n    int connections = 0;\n    int base_port = 7000;\n    if(argc > 2){\n        base_port = atoi(argv[1]);\n    }\n\n    int server_socks[MAX_PORTS];\n\n    for(int i=0; i<MAX_PORTS; i++){\n        int port = base_port + i;\n        bzero(&addr, sizeof(addr));\n        addr.sin_family = AF_INET;\n        addr.sin_port = htons((short)port);\n        inet_pton(AF_INET, ip, &addr.sin_addr);\n\n        int serv_sock;\n        if((serv_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1){\n            goto sock_err;\n        }\n        if(setsockopt(serv_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1){\n            goto sock_err;\n        }\n        if(bind(serv_sock, (struct sockaddr *)&addr, sizeof(addr)) == -1){\n            goto sock_err;\n        }\n        if(listen(serv_sock, 1024) == -1){\n            goto sock_err;\n        }\n\n        server_socks[i] = serv_sock;\n        printf(\"server listen on port: %d\\n\", port);\n    }\n\n    \/\/optlen = sizeof(bufsize);\n    \/\/getsockopt(serv_sock, SOL_SOCKET, SO_RCVBUF, &bufsize, &optlen);\n    \/\/printf(\"default send\/recv buf size: %d\\n\", bufsize);\n\n    while(1){\n        fd_set readset;\n        FD_ZERO(&readset);\n        int maxfd = 0;\n        for(int i=0; i<MAX_PORTS; i++){\n            FD_SET(server_socks[i], &readset);\n            if(server_socks[i] > maxfd){\n                maxfd = server_socks[i];\n            }\n        }\n        int ret = select(maxfd + 1, &readset, NULL, NULL, NULL);\n        if(ret < 0){\n            if(errno == EINTR){\n                continue;\n            }else{\n                printf(\"select error! %s\\n\", strerror(errno));\n                exit(0);\n            }\n        }\n\n        if(ret > 0){\n            for(int i=0; i<MAX_PORTS; i++){\n                if(!FD_ISSET(server_socks[i], &readset)){\n                    continue;\n                }\n                socklen_t addrlen = sizeof(addr);\n                int sock = accept(server_socks[i], (struct sockaddr *)&addr, &addrlen);\n                if(sock == -1){\n                    goto sock_err;\n                }\n                connections ++;\n                printf(\"connections: %d, fd: %d\\n\", connections, sock);\n            }\n        }\n    }\n\n    return 0;\nsock_err:\n    printf(\"error: %s\\n\", strerror(errno));\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u6ce8\u610f, \u670d\u52a1\u5668\u76d1\u542c\u4e86 10 \u4e2a\u7aef\u53e3, \u8fd9\u662f\u4e3a\u4e86\u6d4b\u8bd5\u65b9\u4fbf. \u56e0\u4e3a\u53ea\u6709\u4e00\u53f0\u5ba2\u6237\u7aef\u6d4b\u8bd5\u673a, \u6700\u591a\u53ea\u80fd\u8ddf\u540c\u4e00\u4e2a IP \u7aef\u53e3\u521b\u5efa 30000 \u591a\u4e2a\u8fde\u63a5, \u6240\u4ee5\u670d\u52a1\u5668\u76d1\u542c\u4e86 10 \u4e2a\u7aef\u53e3, \u8fd9\u6837\u4e00\u53f0\u6d4b\u8bd5\u673a\u5c31\u53ef\u4ee5\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u521b\u5efa 30 \u4e07\u4e2a\u8fde\u63a5\u4e86.<\/p>\n\n\n\n
    \u5ba2\u6237\u7aef<\/h4>\n\n\n\n
    #include <stdio.h>\n#include <stdlib.h>\n#include <string.h>\n#include <unistd.h>\n#include <errno.h>\n#include <arpa\/inet.h>\n#include <netinet\/tcp.h>\n\nint main(int argc, char **argv){\n    if(argc <=  2){\n        printf(\"Usage: %s ip port\\n\", argv[0]);\n        exit(0);\n    }\n\n    struct sockaddr_in addr;\n    const char *ip = argv[1];\n    int base_port = atoi(argv[2]);\n    int opt = 1;\n    int bufsize;\n    socklen_t optlen;\n    int connections = 0;\n\n    bzero(&addr, sizeof(addr));\n    addr.sin_family = AF_INET;\n    inet_pton(AF_INET, ip, &addr.sin_addr);\n\n    char tmp_data[10];\n    int index = 0;\n    while(1){\n        if(++index >= 10){\n            index = 0;\n        }\n        int port = base_port + index;\n        printf(\"connect to %s:%d\\n\", ip, port);\n\n        addr.sin_port = htons((short)port);\n\n        int sock;\n        if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1){\n            goto sock_err;\n        }\n        if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1){\n            goto sock_err;\n        }\n\n        connections ++;\n        printf(\"connections: %d, fd: %d\\n\", connections, sock);\n\n        if(connections % 10000 == 9999){\n            printf(\"press Enter to continue: \");\n            getchar();\n        }\n        usleep(1 * 1000);\n        \/*\n           bufsize = 5000;\n           setsockopt(serv_sock, SOL_SOCKET, SO_SNDBUF, &bufsize, sizeof(bufsize));\n           setsockopt(serv_sock, SOL_SOCKET, SO_RCVBUF, &bufsize, sizeof(bufsize));\n         *\/\n    }\n\n    return 0;\nsock_err:\n    printf(\"error: %s\\n\", strerror(errno));\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u6211\u6d4b\u8bd5 10 \u4e07\u4e2a\u8fde\u63a5, \u8fd9\u4e9b\u8fde\u63a5\u662f\u7a7a\u95f2\u7684, \u4ec0\u4e48\u6570\u636e\u4e5f\u4e0d\u53d1\u9001\u4e5f\u4e0d\u63a5\u6536. \u8fd9\u65f6, \u8fdb\u7a0b\u53ea\u5360\u7528\u4e86\u4e0d\u5230 1MB \u7684\u5185\u5b58. \u4f46\u662f, \u901a\u8fc7\u7a0b\u5e8f\u9000\u51fa\u524d\u540e\u7684 free \u547d\u4ee4\u5bf9\u6bd4, \u53d1\u73b0\u64cd\u4f5c\u7cfb\u7edf\u7528\u4e86 200M(\u5927\u81f4)\u5185\u5b58\u6765\u7ef4\u62a4\u8fd9 10 \u4e07\u4e2a\u8fde\u63a5! \u5982\u679c\u662f\u767e\u4e07\u8fde\u63a5\u7684\u8bdd, \u64cd\u4f5c\u7cfb\u7edf\u672c\u8eab\u5c31\u8981\u5360\u7528 2GB \u7684\u5185\u5b58! \u4e5f\u5373 2KB \u6bcf\u8fde\u63a5.<\/p>\n\n\n\n
    \u53ef\u4ee5\u4fee\u6539<\/p>\n\n\n\n
    \/proc\/sys\/net\/ipv4\/tcp_wmem\n\/proc\/sys\/net\/ipv4\/tcp_rmem<\/code><\/pre>\n\n\n\n
    \u6765\u63a7\u5236 TCP \u8fde\u63a5\u7684\u53d1\u9001\u548c\u63a5\u6536\u7f13\u51b2\u7684\u5927\u5c0f<\/pre>\n\n\n\n
    3. \u5e94\u7528\u7a0b\u5e8f\u7ef4\u6301\u767e\u4e07\u8fde\u63a5\u9700\u8981\u591a\u5c11\u5185\u5b58?<\/h3>\n\n\n\n
    \u901a\u8fc7\u4e0a\u9762\u7684\u6d4b\u8bd5\u4ee3\u7801, \u53ef\u4ee5\u53d1\u73b0, \u5e94\u7528\u7a0b\u5e8f\u7ef4\u6301\u767e\u4e07\u4e2a\u7a7a\u95f2\u7684\u8fde\u63a5, \u53ea\u4f1a\u5360\u7528\u64cd\u4f5c\u7cfb\u7edf\u7684\u5185\u5b58, \u901a\u8fc7 ps \u547d\u4ee4\u67e5\u770b\u53ef\u77e5, \u5e94\u7528\u7a0b\u5e8f\u672c\u8eab\u51e0\u4e4e\u4e0d\u5360\u7528\u5185\u5b58.<\/p>\n\n\n\n
    4. \u767e\u4e07\u8fde\u63a5\u7684\u541e\u5410\u91cf\u662f\u5426\u8d85\u8fc7\u4e86\u7f51\u7edc\u9650\u5236?<\/h3>\n\n\n\n
    \u5047\u8bbe\u767e\u4e07\u8fde\u63a5\u4e2d\u6709 20% \u662f\u6d3b\u8dc3\u7684, \u6bcf\u4e2a\u8fde\u63a5\u6bcf\u79d2\u4f20\u8f93 1KB \u7684\u6570\u636e, \u90a3\u4e48\u9700\u8981\u7684\u7f51\u7edc\u5e26\u5bbd\u662f 0.2M x 1KB\/s x 8 = 1.6Gbps, \u8981\u6c42\u670d\u52a1\u5668\u81f3\u5c11\u662f\u4e07\u5146\u7f51\u5361(10Gbps).<\/p>\n\n\n\n
    \u603b\u7ed3<\/h3>\n\n\n\n
    Linux \u7cfb\u7edf\u9700\u8981\u4fee\u6539\u5185\u6838\u53c2\u6570\u548c\u7cfb\u7edf\u914d\u7f6e, \u624d\u80fd\u652f\u6301 C1000K. C1000K \u7684\u5e94\u7528\u8981\u6c42\u670d\u52a1\u5668\u81f3\u5c11\u9700\u8981 2GB \u5185\u5b58, \u5982\u679c\u5e94\u7528\u672c\u8eab\u8fd8\u9700\u8981\u5185\u5b58, \u8fd9\u4e2a\u8981\u6c42\u5e94\u8be5\u662f\u81f3\u5c11 10GB \u5185\u5b58. \u540c\u65f6, \u7f51\u5361\u5e94\u8be5\u81f3\u5c11\u662f\u4e07\u5146\u7f51\u5361.<\/p>\n\n\n\n
    \u5f53\u7136, \u8fd9\u4ec5\u4ec5\u662f\u7406\u8bba\u5206\u6790, \u5b9e\u9645\u7684\u5e94\u7528\u9700\u8981\u66f4\u591a\u7684\u5185\u5b58\u548c CPU \u8d44\u6e90\u6765\u5904\u7406\u4e1a\u52a1\u6570\u636e.<\/p>\n\n\n\n
    \u6d4b\u8bd5\u5de5\u5177<\/h3>\n\n\n\n
    \u6d4b\u8bd5\u64cd\u4f5c\u7cfb\u7edf\u6700\u5927\u8fde\u63a5\u6570\u7684\u5de5\u5177:\u00a0https:\/\/github.com\/ideawu\/c1000k<\/p>\n\n\n\n
    \u53c2\u8003:<\/p>\n\n\n\n
    * http:\/\/www.cyberciti.biz\/faq\/linux-increase-the-maximum-number-of-open-files\/<\/a>
    *     http:\/\/www.lognormal.com\/blog\/2012\/09\/27\/linux-tcpip-tuning\/<\/a><\/p>\n\n\n\n
    Comet \u670d\u52a1\u5668\u662f\u4e00\u7c7b\u903b\u8f91\u76f8\u5bf9\u7b80\u5355, \u9700\u8981\u9ad8\u5e76\u53d1\u8fde\u63a5\u7684\u670d\u52a1\u5668. Comet \u5728\u7f51\u7ad9\u7cfb\u7edf\u4e2d\u7684\u5e94\u7528\u975e\u5e38\u5e7f\u6cdb, \u53ef\u4ee5\u89c1\u8fd9\u7bc7\u65e5\u5fd7\u7684\u4ecb\u7ecd:\u00a0http:\/\/www.ideawu.net\/blog\/archives\/737.html.<\/p>\n\n\n\n
    HTTP \u534f\u8bae\u5904\u7406<\/h3>\n\n\n\n
    \u8981\u5f00\u53d1\u4e00\u4e2a\u652f\u6301\u767e\u4e07\u5e76\u53d1\u8fde\u63a5\u7684 Comet \u670d\u52a1\u5668, \u6211\u9009\u62e9 C\/C++ \u8bed\u8a00, \u5f53\u7136\u8fd8\u6709\u5176\u5b83\u7684\u9009\u62e9\u5982 Erlang, Java \u7b49. \u5bf9\u4e8e\u4e00\u4e2a\u53ea\u652f\u6301 long-polling Comet \u670d\u52a1\u5668, \u9996\u5148\u8981\u5177\u5907\u89e3\u6790 HTTP \u534f\u8bae\u7684\u80fd\u529b, \u6211\u9009\u62e9 libevent \u6765\u5904\u7406 HTTP \u534f\u8bae.<\/p>\n\n\n\n
    \u901a\u9053\u548c\u8ba2\u9605\u8005\u7ba1\u7406<\/h3>\n\n\n\n
    \u670d\u52a1\u5668\u5728\u542f\u52a8\u7684\u65f6\u5019, \u5c31\u9884\u5148\u5206\u914d\u4e86 100 \u4e07\u4e2a\u901a\u9053\u5bf9\u8c61\u7684\u7a7a\u95f4, \u4f46\u8ba2\u9605\u8005\u5bf9\u8c61\u662f\u6309\u9700\u5206\u914d\u7684, \u901a\u8fc7\u5185\u5b58\u6c60\u65b9\u5f0f. 100 \u4e07\u4e2a\u901a\u9053\u5bf9\u8c61\u548c\u7a0b\u5e8f\u7684\u5176\u5b83\u6570\u636e\u5360\u7528\u4e86 24MB \u7684\u5185\u5b58.<\/p>\n\n\n\n
    Benchmark<\/h3>\n\n\n\n
    \u542f\u52a8 icomet \u670d\u52a1\u5668:<\/p>\n\n\n\n
    .\/icomet\n<\/pre>\n\n\n\n
    \u670d\u52a1\u5668\u76d1\u542c\u4e86 100 \u4e2a\u7aef\u53e3, \u662f\u4e3a\u4e86\u6d4b\u8bd5\u65b9\u4fbf<\/p>\n\n\n\n
    \u7136\u540e\u542f\u52a8 benchmark \u5ba2\u6237\u7aef:<\/p>\n\n\n\n
    .\/tools\/benchmark 127.0.0.1 8100\n<\/pre>\n\n\n\n
    benchmark \u7a0b\u5e8f\u6bcf\u521b\u5efa\u5341\u4e07\u4e2a\u8fde\u63a5, \u5c31\u4f1a\u6682\u505c, \u6309\u56de\u8f66\u540e\u7ee7\u7eed. \u901a\u8fc7 top\/ps \u67e5\u770b icomet \u8fdb\u7a0b\u7684\u5185\u5b58\u5360\u7528. \u6700\u7ec8, \u5f97\u51fa\u5982\u4e0b\u6570\u636e.<\/p>\n\n\n\n
    \u8fde\u63a5\u6570<\/th>\u8fdb\u7a0bVIRT<\/th>\u8fdb\u7a0bRES<\/th><\/tr>
    0<\/td>39m<\/td>24m<\/td><\/tr>
    100000<\/td>302m<\/td>288m<\/td><\/tr>
    200000<\/td>579m<\/td>565m<\/td><\/tr>
    500000<\/td>1441m<\/td>1427m<\/td><\/tr>
    1000000<\/td>2734m<\/td>2720m<\/td><\/tr><\/tbody><\/table>\n\n\n\n
    \u53ef\u4ee5\u770b\u5230, \u6bcf\u4e00\u4e2a Comet \u8fde\u63a5\u5927\u7ea6\u5360\u7528\u4e86 2.7KB \u7684\u5185\u5b58. \u6b64\u65f6, \u670d\u52a1\u5668\u7a7a\u95f2, \u8fdb\u7a0b\u5360\u7528 CPU \u4e3a 0%.<\/p>\n\n\n\n
    \u9879\u76ee\u7684\u4ee3\u7801\u5728:\u00a0https:\/\/github.com\/ideawu\/icomet<\/p>\n\n\n\n
    Related posts:<\/h3>\n\n\n\n
    1. \u6784\u5efaC1000K\u7684\u670d\u52a1\u5668(1) \u2013 \u57fa\u7840<\/a><\/li>
    2. HTTP \u957f\u8fde\u63a5\u6280\u672f Comet<\/a><\/li>
    3. \u8f7b\u91cf\u7ea7 COMET \u670d\u52a1\u5668 icomet \u652f\u6301 EventSource(SSE)<\/a><\/li>
    4. iComet \u7684\u4e00\u4e2a\u5e94\u7528\u573a\u666f<\/a><\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"
      [\u8f6c]http:\/\/www.ideawu.net\/blog\/archives\/740.html \u8457\u540d\u7684&nbs […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=\/wp\/v2\/posts\/3845"}],"collection":[{"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3845"}],"version-history":[{"count":2,"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=\/wp\/v2\/posts\/3845\/revisions"}],"predecessor-version":[{"id":3847,"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=\/wp\/v2\/posts\/3845\/revisions\/3847"}],"wp:attachment":[{"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.coolcoding.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}