{"id":1860,"date":"2010-09-17T09:46:00","date_gmt":"2010-09-17T09:46:00","guid":{"rendered":"http:\/\/www.icocean.com\/blog\/?p=1860"},"modified":"1970-01-01T07:00:00","modified_gmt":"1970-01-01T07:00:00","slug":"memcached%E6%B7%B1%E5%BA%A6%E5%88%86%E6%9E%90","status":"publish","type":"post","link":"https:\/\/www.icocean.com\/blog\/?p=1860","title":{"rendered":"Memcached\u6df1\u5ea6\u5206\u6790"},"content":{"rendered":"

Memcached\u662fdanga.com\uff08\u8fd0\u8425LiveJournal\u7684\u6280\u672f\u56e2\u961f\uff09\u5f00\u53d1\u7684\u4e00\u5957\u5206\u5e03\u5f0f\u5185\u5b58\u5bf9\u8c61\u7f13\u5b58\u7cfb\u7edf\uff0c\u7528\u4e8e\u5728\u52a8\u6001\u7cfb\u7edf\u4e2d\u51cf\u5c11\u6570\u636e\u5e93\u8d1f\u8f7d\uff0c\u63d0\u5347\u6027\u80fd\u3002\u5173\u4e8e\u8fd9\u4e2a\u4e1c\u897f\uff0c\u76f8\u4fe1\u5f88\u591a\u4eba\u90fd\u7528\u8fc7\uff0c\u672c\u6587\u610f\u5728\u901a\u8fc7\u5bf9memcached\u7684\u5b9e\u73b0\u53ca\u4ee3\u7801\u5206\u6790\uff0c\u83b7\u5f97\u5bf9\u8fd9\u4e2a\u51fa\u8272\u7684\u5f00\u6e90\u8f6f\u4ef6\u66f4\u6df1\u5165\u7684\u4e86\u89e3\uff0c\u5e76\u53ef\u4ee5\u6839\u636e\u6211\u4eec\u7684\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u66f4\u8fdb\u4e00\u6b65\u7684\u4f18\u5316\u3002\u672b\u4e86\u5c06\u901a\u8fc7\u5bf9BSM_Memcache\u6269\u5c55\u7684\u5206\u6790\uff0c\u52a0\u6df1\u5bf9memcached\u7684\u4f7f\u7528\u65b9\u5f0f\u7406\u89e3\u3002<\/p>\n

\u672c\u6587\u7684\u90e8\u5206\u5185\u5bb9\u53ef\u80fd\u9700\u8981\u6bd4\u8f83\u597d\u7684\u6570\u5b66\u57fa\u7840\u4f5c\u4e3a\u8f85\u52a9\u3002<\/p>\n

\u25ceMemcached\u662f\u4ec0\u4e48<\/p>\n

\u5728\u9610\u8ff0\u8fd9\u4e2a\u95ee\u9898\u4e4b\u524d\uff0c\u6211\u4eec\u9996\u5148\u8981\u6e05\u695a\u5b83\u201c\u4e0d\u662f\u4ec0\u4e48\u201d\u3002\u5f88\u591a\u4eba\u628a\u5b83\u5f53\u4f5c\u548cSharedMemory\u90a3\u79cd\u5f62\u5f0f\u7684\u5b58\u50a8\u8f7d\u4f53\u6765\u4f7f\u7528\uff0c\u867d\u7136memcached\u4f7f\u7528\u4e86\u540c\u6837\u7684\u201cKey=>Value\u201d\u65b9\u5f0f\u7ec4\u7ec7\u6570\u636e\uff0c\u4f46\u662f\u5b83\u548c\u5171\u4eab\u5185\u5b58\u3001APC\u7b49\u672c\u5730\u7f13\u5b58\u6709\u975e\u5e38\u5927\u7684\u533a\u522b\u3002Memcached\u662f\u5206\u5e03\u5f0f\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u5b83\u4e0d\u662f\u672c\u5730\u7684\u3002\u5b83\u57fa\u4e8e\u7f51\u7edc\u8fde\u63a5\uff08\u5f53\u7136\u5b83\u4e5f\u53ef\u4ee5\u4f7f\u7528localhost\uff09\u65b9\u5f0f\u5b8c\u6210\u670d\u52a1\uff0c\u672c\u8eab\u5b83\u662f\u4e00\u4e2a\u72ec\u7acb\u4e8e\u5e94\u7528\u7684\u7a0b\u5e8f\u6216\u5b88\u62a4\u8fdb\u7a0b\uff08Daemon\u65b9\u5f0f\uff09\u3002<\/p>\n

Memcached \u4f7f\u7528libevent\u5e93\u5b9e\u73b0\u7f51\u7edc\u8fde\u63a5\u670d\u52a1\uff0c\u7406\u8bba\u4e0a\u53ef\u4ee5\u5904\u7406\u65e0\u9650\u591a\u7684\u8fde\u63a5\uff0c\u4f46\u662f\u5b83\u548cApache\u4e0d\u540c\uff0c\u5b83\u66f4\u591a\u7684\u65f6\u5019\u662f\u9762\u5411\u7a33\u5b9a\u7684\u6301\u7eed\u8fde\u63a5\u7684\uff0c\u6240\u4ee5\u5b83\u5b9e\u9645\u7684\u5e76\u53d1\u80fd\u529b\u662f\u6709\u9650\u5236\u7684\u3002\u5728\u4fdd\u5b88\u60c5\u51b5\u4e0bmemcached\u7684\u6700\u5927\u540c\u65f6\u8fde\u63a5\u6570\u4e3a200\uff0c\u8fd9\u548cLinux\u7ebf\u7a0b\u80fd\u529b\u6709\u5173\u7cfb\uff0c\u8fd9\u4e2a\u6570\u503c\u662f\u53ef\u4ee5\u8c03\u6574\u7684\u3002\u5173\u4e8e libevent\u53ef\u4ee5\u53c2\u8003\u76f8\u5173\u6587\u6863\u3002 Memcached\u5185\u5b58\u4f7f\u7528\u65b9\u5f0f\u4e5f\u548cAPC\u4e0d\u540c\u3002APC\u662f\u57fa\u4e8e\u5171\u4eab\u5185\u5b58\u548cMMAP\u7684\uff0cmemcachd\u6709\u81ea\u5df1\u7684\u5185\u5b58\u5206\u914d\u7b97\u6cd5\u548c\u7ba1\u7406\u65b9\u5f0f\uff0c\u5b83\u548c\u5171\u4eab\u5185\u5b58\u6ca1\u6709\u5173\u7cfb\uff0c\u4e5f\u6ca1\u6709\u5171\u4eab\u5185\u5b58\u7684\u9650\u5236\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6bcf\u4e2amemcached\u8fdb\u7a0b\u53ef\u4ee5\u7ba1\u74062GB\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u5982\u679c\u9700\u8981\u66f4\u591a\u7684\u7a7a\u95f4\uff0c\u53ef\u4ee5\u589e\u52a0\u8fdb\u7a0b\u6570\u3002<\/p>\n

\u25ceMemcached\u9002\u5408\u4ec0\u4e48\u573a\u5408<\/p>\n

\u5728\u5f88\u591a\u65f6\u5019\uff0cmemcached\u90fd\u88ab\u6ee5\u7528\u4e86\uff0c\u8fd9\u5f53\u7136\u5c11\u4e0d\u4e86\u5bf9\u5b83\u7684\u62b1\u6028\u3002\u6211\u7ecf\u5e38\u5728\u8bba\u575b\u4e0a\u770b\u89c1\u6709\u4eba\u53d1\u8d34\uff0c\u7c7b\u4f3c\u4e8e\u201c\u5982\u4f55\u63d0\u9ad8\u6548\u7387\u201d\uff0c\u56de\u590d\u662f\u201c\u7528memcached\u201d\uff0c\u81f3\u4e8e\u600e\u4e48\u7528\uff0c\u7528\u5728\u54ea\u91cc\uff0c\u7528\u6765\u5e72\u4ec0\u4e48\u4e00\u53e5\u6ca1\u6709\u3002memcached\u4e0d\u662f\u4e07\u80fd\u7684\uff0c\u5b83\u4e5f\u4e0d\u662f\u9002\u7528\u5728\u6240\u6709\u573a\u5408\u3002<\/p>\n

Memcached \u662f\u201c\u5206\u5e03\u5f0f\u201d\u7684\u5185\u5b58\u5bf9\u8c61\u7f13\u5b58\u7cfb\u7edf\uff0c\u90a3\u4e48\u5c31\u662f\u8bf4\uff0c\u90a3\u4e9b\u4e0d\u9700\u8981\u201c\u5206\u5e03\u201d\u7684\uff0c\u4e0d\u9700\u8981\u5171\u4eab\u7684\uff0c\u6216\u8005\u5e72\u8106\u89c4\u6a21\u5c0f\u5230\u53ea\u6709\u4e00\u53f0\u670d\u52a1\u5668\u7684\u5e94\u7528\uff0cmemcached\u4e0d\u4f1a\u5e26\u6765\u4efb\u4f55\u597d\u5904\uff0c\u76f8\u53cd\u8fd8\u4f1a\u62d6\u6162\u7cfb\u7edf\u6548\u7387\uff0c\u56e0\u4e3a\u7f51\u7edc\u8fde\u63a5\u540c\u6837\u9700\u8981\u8d44\u6e90\uff0c\u5373\u4f7f\u662fUNIX\u672c\u5730\u8fde\u63a5\u4e5f\u4e00\u6837\u3002 \u5728\u6211\u4e4b\u524d\u7684\u6d4b\u8bd5\u6570\u636e\u4e2d\u663e\u793a\uff0cmemcached\u672c\u5730\u8bfb\u5199\u901f\u5ea6\u8981\u6bd4\u76f4\u63a5PHP\u5185\u5b58\u6570\u7ec4\u6162\u51e0\u5341\u500d\uff0c\u800cAPC\u3001\u5171\u4eab\u5185\u5b58\u65b9\u5f0f\u90fd\u548c\u76f4\u63a5\u6570\u7ec4\u5dee\u4e0d\u591a\u3002\u53ef\u89c1\uff0c\u5982\u679c\u53ea\u662f\u672c\u5730\u7ea7\u7f13\u5b58\uff0c\u4f7f\u7528memcached\u662f\u975e\u5e38\u4e0d\u5212\u7b97\u7684\u3002<\/p>\n

Memcached\u5728\u5f88\u591a\u65f6\u5019\u90fd\u662f\u4f5c\u4e3a\u6570\u636e\u5e93\u524d\u7aefcache\u4f7f\u7528\u7684\u3002\u56e0\u4e3a\u5b83\u6bd4\u6570\u636e\u5e93\u5c11\u4e86\u5f88\u591aSQL\u89e3\u6790\u3001\u78c1\u76d8\u64cd\u4f5c\u7b49\u5f00\u9500\uff0c\u800c\u4e14\u5b83\u662f\u4f7f\u7528\u5185\u5b58\u6765\u7ba1\u7406\u6570\u636e\u7684\uff0c\u6240\u4ee5\u5b83\u53ef\u4ee5\u63d0\u4f9b\u6bd4\u76f4\u63a5\u8bfb\u53d6\u6570\u636e\u5e93\u66f4\u597d\u7684\u6027\u80fd\uff0c\u5728\u5927\u578b\u7cfb\u7edf\u4e2d\uff0c\u8bbf\u95ee\u540c\u6837\u7684\u6570\u636e\u662f\u5f88\u9891\u7e41\u7684\uff0cmemcached\u53ef\u4ee5\u5927\u5927\u964d\u4f4e\u6570\u636e\u5e93\u538b\u529b\uff0c\u4f7f\u7cfb\u7edf\u6267\u884c\u6548\u7387\u63d0\u5347\u3002\u53e6\u5916\uff0cmemcached\u4e5f\u7ecf\u5e38\u4f5c\u4e3a\u670d\u52a1\u4e4b\u95f4\u6570\u636e\u5171\u4eab\u7684\u5b58\u50a8\u5a92\u4ecb\uff0c\u4f8b\u5982\u5728SSO\u7cfb\u7edf\u4e2d\u4fdd\u5b58\u7cfb\u7edf\u5355\u70b9\u767b\u9646\u72b6\u6001\u7684\u6570\u636e\u5c31\u53ef\u4ee5\u4fdd\u5b58\u5728memcached\u4e2d\uff0c\u88ab\u591a\u4e2a\u5e94\u7528\u5171\u4eab\u3002<\/p>\n

\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cmemcached\u4f7f\u7528\u5185\u5b58\u7ba1\u7406\u6570\u636e\uff0c\u6240\u4ee5\u5b83\u662f\u6613\u5931\u7684\uff0c\u5f53\u670d\u52a1\u5668\u91cd\u542f\uff0c\u6216\u8005memcached\u8fdb\u7a0b\u4e2d\u6b62\uff0c\u6570\u636e\u4fbf\u4f1a\u4e22\u5931\uff0c\u6240\u4ee5memcached\u4e0d\u80fd\u7528\u6765\u6301\u4e45\u4fdd\u5b58\u6570\u636e\u3002\u5f88\u591a\u4eba\u7684\u9519\u8bef\u7406\u89e3\uff0cmemcached\u7684\u6027\u80fd\u975e\u5e38\u597d\uff0c\u597d\u5230\u4e86\u5185\u5b58\u548c\u786c\u76d8\u7684\u5bf9\u6bd4\u7a0b\u5ea6\uff0c\u5176\u5b9ememcached\u4f7f\u7528\u5185\u5b58\u5e76\u4e0d\u4f1a\u5f97\u5230\u6210\u767e\u4e0a\u5343\u7684\u8bfb\u5199\u901f\u5ea6\u63d0\u9ad8\uff0c\u5b83\u7684\u5b9e\u9645\u74f6\u9888\u5728\u4e8e\u7f51\u7edc\u8fde\u63a5\uff0c\u5b83\u548c\u4f7f\u7528\u78c1\u76d8\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u76f8\u6bd4\uff0c\u597d\u5904\u5728\u4e8e\u5b83\u672c\u8eab\u975e\u5e38\u201c\u8f7b\u201d\uff0c\u56e0\u4e3a\u6ca1\u6709\u8fc7\u591a\u7684\u5f00\u9500\u548c\u76f4\u63a5\u7684\u8bfb\u5199\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u8f7b\u677e\u5e94\u4ed8\u975e\u5e38\u5927\u7684\u6570\u636e\u4ea4\u6362\u91cf\uff0c\u6240\u4ee5\u7ecf\u5e38\u4f1a\u51fa\u73b0\u4e24\u6761\u5343\u5146\u7f51\u7edc\u5e26\u5bbd\u90fd\u6ee1\u8d1f\u8377\u4e86\uff0cmemcached\u8fdb\u7a0b\u672c\u8eab\u5e76\u4e0d\u5360\u7528\u591a\u5c11CPU\u8d44\u6e90\u7684\u60c5\u51b5\u3002<\/p>\n

\u25ceMemcached\u7684\u5de5\u4f5c\u65b9\u5f0f<\/p>\n

\u4ee5\u4e0b\u7684\u90e8\u5206\u4e2d\uff0c\u8bfb\u8005\u6700\u597d\u80fd\u51c6\u5907\u4e00\u4efdmemcached\u7684\u6e90\u4ee3\u7801\u3002<\/p>\n

Memcached\u662f\u4f20\u7edf\u7684\u7f51\u7edc\u670d\u52a1\u7a0b\u5e8f\uff0c\u5982\u679c\u542f\u52a8\u7684\u65f6\u5019\u4f7f\u7528\u4e86-d\u53c2\u6570\uff0c\u5b83\u4f1a\u4ee5\u5b88\u62a4\u8fdb\u7a0b\u7684\u65b9\u5f0f\u6267\u884c\u3002\u521b\u5efa\u5b88\u62a4\u8fdb\u7a0b\u7531daemon.c\u5b8c\u6210\uff0c\u8fd9\u4e2a\u7a0b\u5e8f\u53ea\u6709\u4e00\u4e2adaemon\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u5f88\u7b80\u5355\uff08\u5982\u65e0\u7279\u6b8a\u8bf4\u660e\uff0c\u4ee3\u7801\u4ee51.2.1\u4e3a\u51c6\uff09\uff1a<\/p>\n

CODE:
#include
#include
#include <\/p>\n

int
daemon(nochdir, noclose)
    int nochdir, noclose;
{
    int fd;<\/p>\n

    switch (fork()) {
    case -1:
        return (-1);
    case 0:
        break;  
    default:
        _exit(0);
    }<\/p>\n

    if (setsid() == -1)
        return (-1);<\/p>\n

    if (!nochdir)
        (void)chdir(“\/”);<\/p>\n

    if (!noclose && (fd = open(“\/dev\/null”, O_RDWR, 0)) != -1) {
        (void)dup2(fd, STDIN_FILENO);
        (void)dup2(fd, STDOUT_FILENO);
        (void)dup2(fd, STDERR_FILENO);
        if (fd > STDERR_FILENO)
            (void)close(fd);
    }
    return (0);
}
\u8fd9\u4e2a\u51fd\u6570 fork \u4e86\u6574\u4e2a\u8fdb\u7a0b\u4e4b\u540e\uff0c\u7236\u8fdb\u7a0b\u5c31\u9000\u51fa\uff0c\u63a5\u7740\u91cd\u65b0\u5b9a\u4f4d STDIN \u3001 STDOUT \u3001 STDERR \u5230\u7a7a\u8bbe\u5907\uff0c daemon \u5c31\u5efa\u7acb\u6210\u529f\u4e86\u3002<\/p>\n

Memcached \u672c\u8eab\u7684\u542f\u52a8\u8fc7\u7a0b\uff0c\u5728 memcached.c \u7684 main \u51fd\u6570\u4e2d\u987a\u5e8f\u5982\u4e0b\uff1a<\/p>\n

1 \u3001\u8c03\u7528 settings_init() \u8bbe\u5b9a\u521d\u59cb\u5316\u53c2\u6570
2 \u3001\u4ece\u542f\u52a8\u547d\u4ee4\u4e2d\u8bfb\u53d6\u53c2\u6570\u6765\u8bbe\u7f6e setting \u503c
3 \u3001\u8bbe\u5b9a LIMIT \u53c2\u6570
4 \u3001\u5f00\u59cb\u7f51\u7edc socket \u76d1\u542c\uff08\u5982\u679c\u975e socketpath \u5b58\u5728\uff09\uff08 1.2 \u4e4b\u540e\u652f\u6301 UDP \u65b9\u5f0f\uff09
5 \u3001\u68c0\u67e5\u7528\u6237\u8eab\u4efd\uff08 Memcached \u4e0d\u5141\u8bb8 root \u8eab\u4efd\u542f\u52a8\uff09
6 \u3001\u5982\u679c\u6709 socketpath \u5b58\u5728\uff0c\u5f00\u542f UNIX \u672c\u5730\u8fde\u63a5\uff08Sock \u7ba1\u9053\uff09
7 \u3001\u5982\u679c\u4ee5 -d \u65b9\u5f0f\u542f\u52a8\uff0c\u521b\u5efa\u5b88\u62a4\u8fdb\u7a0b\uff08\u5982\u4e0a\u8c03\u7528 daemon \u51fd\u6570\uff09
8 \u3001\u521d\u59cb\u5316 item \u3001 event \u3001\u72b6\u6001\u4fe1\u606f\u3001 hash \u3001\u8fde\u63a5\u3001 slab
9 \u3001\u5982\u8bbe\u7f6e\u4e2d managed \u751f\u6548\uff0c\u521b\u5efa bucket \u6570\u7ec4
10 \u3001\u68c0\u67e5\u662f\u5426\u9700\u8981\u9501\u5b9a\u5185\u5b58\u9875
11 \u3001\u521d\u59cb\u5316\u4fe1\u53f7\u3001\u8fde\u63a5\u3001\u5220\u9664\u961f\u5217
12 \u3001\u5982\u679c daemon \u65b9\u5f0f\uff0c\u5904\u7406\u8fdb\u7a0b ID
13 \u3001event \u5f00\u59cb\uff0c\u542f\u52a8\u8fc7\u7a0b\u7ed3\u675f\uff0c main \u51fd\u6570\u8fdb\u5165\u5faa\u73af\u3002<\/p>\n

\u5728 daemon \u65b9\u5f0f\u4e2d\uff0c\u56e0\u4e3a stderr \u5df2\u7ecf\u88ab\u5b9a\u5411\u5230\u9ed1\u6d1e\uff0c\u6240\u4ee5\u4e0d\u4f1a\u53cd\u9988\u6267\u884c\u4e2d\u7684\u53ef\u89c1\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n

memcached.c \u7684\u4e3b\u5faa\u73af\u51fd\u6570\u662f drive_machine \uff0c\u4f20\u5165\u53c2\u6570\u662f\u6307\u5411\u5f53\u524d\u7684\u8fde\u63a5\u7684\u7ed3\u6784\u6307\u9488\uff0c\u6839\u636e state \u6210\u5458\u7684\u72b6\u6001\u6765\u5b9a\u52a8\u4f5c\u3002<\/p>\n

Memcached \u4f7f\u7528\u4e00\u5957\u81ea\u5b9a\u4e49\u7684\u534f\u8bae\u5b8c\u6210\u6570\u636e\u4ea4\u6362\uff0c\u5b83\u7684 protocol \u6587\u6863\u53ef\u4ee5\u53c2\u8003\uff1a http:\/\/code.sixapart.com\/svn\/memcached\/trunk\/server\/doc\/protocol.txt<\/p>\n

\u5728API\u4e2d\uff0c\u6362\u884c\u7b26\u53f7\u7edf\u4e00\u4e3a\r\n<\/p>\n

\u25ceMemcached\u7684\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f<\/p>\n

Memcached\u6709\u4e00\u4e2a\u5f88\u6709\u7279\u8272\u7684\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6548\u7387\uff0c\u5b83\u4f7f\u7528\u9884\u7533\u8bf7\u548c\u5206\u7ec4\u7684\u65b9\u5f0f\u7ba1\u7406\u5185\u5b58\u7a7a\u95f4\uff0c\u800c\u5e76\u4e0d\u662f\u6bcf\u6b21\u9700\u8981\u5199\u5165\u6570\u636e\u7684\u65f6\u5019\u53bbmalloc\uff0c\u5220\u9664\u6570\u636e\u7684\u65f6\u5019free\u4e00\u4e2a\u6307\u9488\u3002Memcached\u4f7f\u7528slab->chunk\u7684\u7ec4\u7ec7\u65b9\u5f0f\u7ba1\u7406\u5185\u5b58\u3002<\/p>\n

1.1\u548c1.2\u7684slabs.c\u4e2d\u7684slab\u7a7a\u95f4\u5212\u5206\u7b97\u6cd5\u6709\u4e00\u4e9b\u4e0d\u540c\uff0c\u540e\u9762\u4f1a\u5206\u522b\u4ecb\u7ecd\u3002<\/p>\n

Slab \u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u5185\u5b58\u5757\uff0c\u4e00\u4e2aslab\u662fmemcached\u4e00\u6b21\u7533\u8bf7\u5185\u5b58\u7684\u6700\u5c0f\u5355\u4f4d\uff0c\u5728memcached\u4e2d\uff0c\u4e00\u4e2aslab\u7684\u5927\u5c0f\u9ed8\u8ba4\u4e3a1048576\u5b57\u8282\uff081MB\uff09\uff0c\u6240\u4ee5memcached\u90fd\u662f\u6574MB\u7684\u4f7f\u7528\u5185\u5b58\u3002\u6bcf\u4e00\u4e2aslab\u88ab\u5212\u5206\u4e3a\u82e5\u5e72\u4e2achunk\uff0c\u6bcf\u4e2achunk\u91cc\u4fdd\u5b58\u4e00\u4e2aitem\uff0c\u6bcf\u4e2aitem\u540c\u65f6\u5305\u542b\u4e86item\u7ed3\u6784\u4f53\u3001key\u548cvalue\uff08\u6ce8\u610f\u5728memcached\u4e2d\u7684value\u662f\u53ea\u6709\u5b57\u7b26\u4e32\u7684\uff09\u3002slab\u6309\u7167\u81ea\u5df1\u7684id\u5206\u522b\u7ec4\u6210\u94fe\u8868\uff0c\u8fd9\u4e9b\u94fe\u8868\u53c8\u6309id\u6302\u5728\u4e00\u4e2aslabclass\u6570\u7ec4\u4e0a\uff0c\u6574\u4e2a\u7ed3\u6784\u770b\u8d77\u6765\u6709\u70b9\u50cf\u4e8c\u7ef4\u6570\u7ec4\u3002slabclass\u7684\u957f\u5ea6\u57281.1\u4e2d\u662f21\uff0c\u57281.2\u4e2d\u662f200\u3002<\/p>\n

slab\u6709\u4e00\u4e2a\u521d\u59cbchunk\u5927\u5c0f\uff0c1.1\u4e2d\u662f1\u5b57\u8282\uff0c1.2\u4e2d\u662f80\u5b57\u8282\uff0c1.2\u4e2d\u6709\u4e00\u4e2afactor\u503c\uff0c\u9ed8\u8ba4\u4e3a1.25<\/p>\n

\u5728 1.1\u4e2d\uff0cchunk\u5927\u5c0f\u8868\u793a\u4e3a\u521d\u59cb\u5927\u5c0f*2^n\uff0cn\u4e3aclassid\uff0c\u5373\uff1aid\u4e3a0\u7684slab\uff0c\u6bcfchunk\u5927\u5c0f1\u5b57\u8282\uff0cid\u4e3a1\u7684slab\uff0c\u6bcf chunk\u5927\u5c0f2\u5b57\u8282\uff0cid\u4e3a2\u7684slab\uff0c\u6bcfchunk\u5927\u5c0f4\u5b57\u8282\u2026\u2026id\u4e3a20\u7684slab\uff0c\u6bcfchunk\u5927\u5c0f\u4e3a1MB\uff0c\u5c31\u662f\u8bf4id\u4e3a20\u7684slab\u91cc\u53ea\u6709\u4e00\u4e2achunk\uff1a<\/p>\n

CODE:
void slabs_init(size_t limit) {
    int i;
    int size=1;<\/p>\n

    mem_limit = limit;
    for(i=0; i<=POWER_LARGEST; i++, size*=2) {
        slabclass.size = size;
        slabclass.perslab = POWER_BLOCK \/ size;
        slabclass.slots = 0;
        slabclass.sl_curr = slabclass.sl_total = slabclass.slabs = 0;
        slabclass.end_page_ptr = 0;
        slabclass.end_page_free = 0;
        slabclass.slab_list = 0;
        slabclass.list_size = 0;
        slabclass.killing = 0;
    }<\/p>\n

    \/* for the test suite:  faking of how much we've already malloc'd *\/
    {
        char *t_initial_malloc = getenv(“T_MEMD_INITIAL_MALLOC”);
        if (t_initial_malloc) {
            mem_malloced = atol(getenv(“T_MEMD_INITIAL_MALLOC”));
        }
    }<\/p>\n

    \/* pre-allocate slabs by default, unless the environment variable
       for testing is set to something non-zero *\/
    {
        char *pre_alloc = getenv(“T_MEMD_SLABS_ALLOC”);
        if (!pre_alloc || atoi(pre_alloc)) {
            slabs_preallocate(limit \/ POWER_BLOCK);
        }
    }
}
\u57281.2\u4e2d\uff0cchunk\u5927\u5c0f\u8868\u793a\u4e3a\u521d\u59cb\u5927\u5c0f*f^n\uff0cf\u4e3afactor\uff0c\u5728memcached.c\u4e2d\u5b9a\u4e49\uff0cn\u4e3aclassid\uff0c\u540c\u65f6\uff0c201\u4e2a\u5934\u4e0d\u662f\u5168\u90e8\u90fd\u8981\u521d\u59cb\u5316\u7684\uff0c\u56e0\u4e3afactor\u53ef\uff0c\u521d\u59cb\u5316\u53ea\u5faa\u73af\u5230\u8ba1\u7b97\u51fa\u7684\u5927\u5c0f\u8fbe\u5230slab\u5927\u5c0f\u7684\u4e00\u534a\u4e3a\u6b62\uff0c\u800c\u4e14\u5b83\u662f\u4eceid1\u5f00\u59cb\u7684\uff0c\u5373\uff1aid\u4e3a1\u7684slab\uff0c\u6bcf chunk\u5927\u5c0f80\u5b57\u8282\uff0cid\u4e3a2\u7684slab\uff0c\u6bcfchunk\u5927\u5c0f80*f\uff0cid\u4e3a3\u7684slab\uff0c\u6bcfchunk\u5927\u5c0f80*f^2\uff0c\u521d\u59cb\u5316\u5927\u5c0f\u6709\u4e00\u4e2a\u4fee\u6b63\u503c CHUNK_ALIGN_BYTES\uff0c\u7528\u6765\u4fdd\u8bc1n-byte\u6392\u5217 \uff08\u4fdd\u8bc1\u7ed3\u679c\u662fCHUNK_ALIGN_BYTES\u7684\u6574\u500d\u6570\uff09\u3002\u8fd9\u6837\uff0c\u5728\u6807\u51c6\u60c5\u51b5\u4e0b\uff0cmemcached1.2\u4f1a\u521d\u59cb\u5316\u5230id40\uff0c\u8fd9\u4e2aslab\u4e2d\u6bcf\u4e2a chunk\u5927\u5c0f\u4e3a504692\uff0c\u6bcf\u4e2aslab\u4e2d\u6709\u4e24\u4e2achunk\u3002\u6700\u540e\uff0cslab_init\u51fd\u6570\u4f1a\u5728\u6700\u540e\u8865\u8db3\u4e00\u4e2aid41\uff0c\u5b83\u662f\u6574\u5757\u7684\uff0c\u4e5f\u5c31\u662f\u8fd9\u4e2a slab\u4e2d\u53ea\u6709\u4e00\u4e2a1MB\u5927\u7684chunk\uff1a<\/p>\n

CODE:
void slabs_init(size_t limit, double factor) {
    int i = POWER_SMALLEST – 1;
    unsigned int size = sizeof(item) + settings.chunk_size;<\/p>\n

    \/* Factor of 2.0 means use the default memcached behavior *\/
    if (factor == 2.0 && size < 128)
        size = 128;<\/p>\n

    mem_limit = limit;
    memset(slabclass, 0, sizeof(slabclass));<\/p>\n

    while (++i < POWER_LARGEST && size <= POWER_BLOCK \/ 2) {
        \/* Make sure items are always n-byte aligned *\/
        if (size % CHUNK_ALIGN_BYTES)
            size += CHUNK_ALIGN_BYTES – (size % CHUNK_ALIGN_BYTES);<\/p>\n

        slabclass.size = size;
        slabclass.perslab = POWER_BLOCK \/ slabclass.size;
        size *= factor;
        if (settings.verbose > 1) {
            fprintf(stderr, “slab class %3d: chunk size %6d perslab %5d\n”,
                    i, slabclass.size, slabclass.perslab);
        }      
    }<\/p>\n

    power_largest = i;
    slabclass[power_largest].size = POWER_BLOCK;
    slabclass[power_largest].perslab = 1;<\/p>\n

    \/* for the test suite:  faking of how much we've already malloc'd *\/
    {
        char *t_initial_malloc = getenv(“T_MEMD_INITIAL_MALLOC”);
        if (t_initial_malloc) {
            mem_malloced = atol(getenv(“T_MEMD_INITIAL_MALLOC”));
        }      <\/p>\n

    }<\/p>\n

#ifndef DONT_PREALLOC_SLABS
    {
        char *pre_alloc = getenv(“T_MEMD_SLABS_ALLOC”);
        if (!pre_alloc || atoi(pre_alloc)) {
            slabs_preallocate(limit \/ POWER_BLOCK);
        }
    }
#endif
}
\u7531\u4e0a\u53ef\u4ee5\u770b\u51fa\uff0cmemcached\u7684\u5185\u5b58\u5206\u914d\u662f\u6709\u5197\u4f59\u7684\uff0c\u5f53\u4e00\u4e2aslab\u4e0d\u80fd\u88ab\u5b83\u6240\u62e5\u6709\u7684chunk\u5927\u5c0f\u6574\u9664\u65f6\uff0cslab\u5c3e\u90e8\u5269\u4f59\u7684\u7a7a\u95f4\u5c31\u88ab\u4e22\u5f03\u4e86\uff0c\u5982id40\u4e2d\uff0c\u4e24\u4e2achunk\u5360\u7528\u4e861009384\u5b57\u8282\uff0c\u8fd9\u4e2aslab\u4e00\u5171\u67091MB\uff0c\u90a3\u4e48\u5c31\u670939192\u5b57\u8282\u88ab\u6d6a\u8d39\u4e86\u3002<\/p>\n

Memcached \u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u6765\u5206\u914d\u5185\u5b58\uff0c\u662f\u4e3a\u4e86\u53ef\u4ee5\u5feb\u901f\u7684\u901a\u8fc7item\u957f\u5ea6\u5b9a\u4f4d\u51faslab\u7684classid\uff0c\u6709\u4e00\u70b9\u7c7b\u4f3chash\uff0c\u56e0\u4e3aitem\u7684\u957f\u5ea6\u662f\u53ef\u4ee5\u8ba1\u7b97\u7684\uff0c\u6bd4\u5982\u4e00\u4e2aitem\u7684\u957f\u5ea6\u662f300\u5b57\u8282\uff0c\u57281.2\u4e2d\u5c31\u53ef\u4ee5\u5f97\u5230\u5b83\u5e94\u8be5\u4fdd\u5b58\u5728id7\u7684slab\u4e2d\uff0c\u56e0\u4e3a\u6309\u7167\u4e0a\u9762\u7684\u8ba1\u7b97\u65b9\u6cd5\uff0cid6\u7684chunk\u5927\u5c0f\u662f252\u5b57\u8282\uff0cid7\u7684chunk\u5927\u5c0f\u662f316\u5b57\u8282\uff0cid8\u7684chunk\u5927\u5c0f\u662f396\u5b57\u8282\uff0c\u8868\u793a\u6240\u6709252\u5230316\u5b57\u8282\u7684item\u90fd\u5e94\u8be5\u4fdd\u5b58\u5728id7\u4e2d\u3002\u540c\u7406\uff0c\u5728 1.1\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u8ba1\u7b97\u5f97\u5230\u5b83\u51fa\u4e8e256\u548c512\u4e4b\u95f4\uff0c\u5e94\u8be5\u653e\u5728chunk_size\u4e3a512\u7684id9\u4e2d(32\u4f4d\u7cfb\u7edf\uff09\u3002<\/p>\n

Memcached \u521d\u59cb\u5316\u7684\u65f6\u5019\uff0c\u4f1a\u521d\u59cb\u5316slab\uff08\u524d\u9762\u53ef\u4ee5\u770b\u5230\uff0c\u5728main\u51fd\u6570\u4e2d\u8c03\u7528\u4e86slabs_init()\uff09\u3002\u5b83\u4f1a\u5728slabs_init()\u4e2d\u68c0\u67e5\u4e00\u4e2a\u5e38\u91cf DONT_PREALLOC_SLABS\uff0c\u5982\u679c\u8fd9\u4e2a\u6ca1\u6709\u88ab\u5b9a\u4e49\uff0c\u8bf4\u660e\u4f7f\u7528\u9884\u5206\u914d\u5185\u5b58\u65b9\u5f0f\u521d\u59cb\u5316slab\uff0c\u8fd9\u6837\u5728\u6240\u6709\u5df2\u7ecf\u5b9a\u4e49\u8fc7\u7684slabclass\u4e2d\uff0c\u6bcf\u4e00\u4e2aid\u521b\u5efa\u4e00\u4e2aslab\u3002\u8fd9\u6837\u5c31\u8868\u793a\uff0c1.2\u5728\u9ed8\u8ba4\u7684\u73af\u5883\u4e2d\u542f\u52a8\u8fdb\u7a0b\u540e\u8981\u5206\u914d41MB\u7684slab\u7a7a\u95f4\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u91cc\uff0cmemcached\u7684\u7b2c\u4e8c\u4e2a\u5185\u5b58\u5197\u4f59\u53d1\u751f\u4e86\uff0c\u56e0\u4e3a\u6709\u53ef\u80fd\u4e00\u4e2aid\u6839\u672c\u6ca1\u6709\u88ab\u4f7f\u7528\u8fc7\uff0c\u4f46\u662f\u5b83\u4e5f\u9ed8\u8ba4\u7533\u8bf7\u4e86\u4e00\u4e2aslab\uff0c\u6bcf\u4e2aslab\u4f1a\u7528\u63891MB\u5185\u5b58<\/p>\n

\u5f53\u4e00\u4e2aslab\u7528\u5149\u540e\uff0c\u53c8\u6709\u65b0\u7684item\u8981\u63d2\u5165\u8fd9\u4e2aid\uff0c\u90a3\u4e48\u5b83\u5c31\u4f1a\u91cd\u65b0\u7533\u8bf7\u65b0\u7684slab\uff0c\u7533\u8bf7\u65b0\u7684slab\u65f6\uff0c\u5bf9\u5e94id\u7684slab\u94fe\u8868\u5c31\u8981\u589e\u957f\uff0c\u8fd9\u4e2a\u94fe\u8868\u662f\u6210\u500d\u589e\u957f\u7684\uff0c\u5728\u51fd\u6570grow_slab_list\u51fd\u6570\u4e2d\uff0c\u8fd9\u4e2a\u94fe\u7684\u957f\u5ea6\u4ece1\u53d8\u62102\uff0c\u4ece2\u53d8\u62104\uff0c\u4ece4\u53d8\u62108\u2026\u2026\uff1a<\/p>\n

CODE:
static int grow_slab_list (unsigned int id) {
    slabclass_t *p = &slabclass[id];
    if (p->slabs == p->list_size) {
        size_t new_size =  p->list_size ? p->list_size * 2 : 16;
        void *new_list = realloc(p->slab_list, new_size*sizeof(void*));
        if (new_list == 0) return 0;
        p->list_size = new_size;
        p->slab_list = new_list;
    }
    return 1;
}
\u5728\u5b9a\u4f4ditem\u65f6\uff0c\u90fd\u662f\u4f7f\u7528slabs_clsid\u51fd\u6570\uff0c\u4f20\u5165\u53c2\u6570\u4e3aitem\u5927\u5c0f\uff0c\u8fd4\u56de\u503c\u4e3aclassid\uff0c\u7531\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u4ee5\u770b\u51fa\uff0cmemcached\u7684\u7b2c\u4e09\u4e2a\u5185\u5b58\u5197\u4f59\u53d1\u751f\u5728\u4fdd\u5b58item\u7684\u8fc7\u7a0b\u4e2d\uff0citem\u603b\u662f\u5c0f\u4e8e\u6216\u7b49\u4e8echunk\u5927\u5c0f\u7684\uff0c\u5f53item\u5c0f\u4e8echunk\u5927\u5c0f\u65f6\uff0c\u5c31\u53c8\u53d1\u751f\u4e86\u7a7a\u95f4\u6d6a\u8d39\u3002<\/p>\n

\u25ceMemcached\u7684NewHash\u7b97\u6cd5<\/p>\n

Memcached \u7684item\u4fdd\u5b58\u57fa\u4e8e\u4e00\u4e2a\u5927\u7684hash\u8868\uff0c\u5b83\u7684\u5b9e\u9645\u5730\u5740\u5c31\u662fslab\u4e2d\u7684chunk\u504f\u79fb\uff0c\u4f46\u662f\u5b83\u7684\u5b9a\u4f4d\u662f\u4f9d\u9760\u5bf9key\u505ahash\u7684\u7ed3\u679c\uff0c\u5728 primary_hashtable\u4e2d\u627e\u5230\u7684\u3002\u5728assoc.c\u548citems.c\u4e2d\u5b9a\u4e49\u4e86\u6240\u6709\u7684hash\u548citem\u64cd\u4f5c\u3002<\/p>\n

Memcached\u4f7f\u7528\u4e86\u4e00\u4e2a\u53eb\u505aNewHash\u7684\u7b97\u6cd5\uff0c\u5b83\u7684\u6548\u679c\u5f88\u597d\uff0c\u6548\u7387\u4e5f\u5f88\u9ad8\u30021.1\u548c1.2\u7684NewHash\u6709\u4e00\u4e9b\u4e0d\u540c\uff0c\u4e3b\u8981\u7684\u5b9e\u73b0\u65b9\u5f0f\u8fd8\u662f\u4e00\u6837\u7684\uff0c1.2\u7684hash\u51fd\u6570\u662f\u7ecf\u8fc7\u6574\u7406\u4f18\u5316\u7684\uff0c\u9002\u5e94\u6027\u66f4\u597d\u4e00\u4e9b\u3002<\/p>\n

NewHash\u7684\u539f\u578b\u53c2\u8003\uff1ahttp:\/\/burtleburtle.net\/bob\/hash\/evahash.html\u3002\u6570\u5b66\u5bb6\u603b\u662f\u6709\u70b9\u5947\u602a\uff0c\u5475\u5475\uff5e<\/p>\n

\u4e3a\u4e86\u53d8\u6362\u65b9\u4fbf\uff0c\u5b9a\u4e49\u4e86u4\u548cu1\u4e24\u79cd\u6570\u636e\u7c7b\u578b\uff0cu4\u5c31\u662f\u65e0\u7b26\u53f7\u7684\u957f\u6574\u5f62\uff0cu1\u5c31\u662f\u65e0\u7b26\u53f7char(0-255)\u3002<\/p>\n

\u5177\u4f53\u4ee3\u7801\u53ef\u4ee5\u53c2\u80031.1\u548c1.2\u6e90\u7801\u5305\u3002<\/p>\n

\u6ce8\u610f\u8fd9\u91cc\u7684hashtable\u957f\u5ea6\uff0c1.1\u548c1.2\u4e5f\u662f\u6709\u533a\u522b\u7684\uff0c1.1\u4e2d\u5b9a\u4e49\u4e86HASHPOWER\u5e38\u91cf\u4e3a20\uff0chashtable\u8868\u957f\u4e3a hashsize(HASHPOWER)\uff0c\u5c31\u662f4MB\uff08hashsize\u662f\u4e00\u4e2a\u5b8f\uff0c\u8868\u793a1\u53f3\u79fbn\u4f4d\uff09\uff0c1.2\u4e2d\u662f\u53d8\u91cf16\uff0c\u5373hashtable\u8868\u957f 65536\uff1a<\/p>\n

CODE:
typedef  unsigned long  int  ub4;   \/* unsigned 4-byte quantities *\/
typedef  unsigned       char ub1;   \/* unsigned 1-byte quantities *\/<\/p>\n

#define hashsize(n) ((ub4)1<<(n))
#define hashmask(n) (hashsize(n)-1)
\u5728assoc_init()\u4e2d\uff0c\u4f1a\u5bf9primary_hashtable\u505a\u521d\u59cb\u5316\uff0c\u5bf9\u5e94\u7684hash\u64cd\u4f5c\u5305\u62ec\uff1aassoc_find()\u3001 assoc_expand()\u3001assoc_move_next_bucket()\u3001assoc_insert()\u3001assoc_delete()\uff0c\u5bf9\u5e94\u4e8eitem\u7684\u8bfb\u5199\u64cd\u4f5c\u3002\u5176\u4e2dassoc_find()\u662f\u6839\u636ekey\u548ckey\u957f\u5bfb\u627e\u5bf9\u5e94\u7684item\u5730\u5740\u7684\u51fd\u6570\uff08\u6ce8\u610f\u5728C\u4e2d\uff0c\u5f88\u591a\u65f6\u5019\u90fd\u662f\u540c\u65f6\u76f4\u63a5\u4f20\u5165\u5b57\u7b26\u4e32\u548c\u5b57\u7b26\u4e32\u957f\u5ea6\uff0c\u800c\u4e0d\u662f\u5728\u51fd\u6570\u5185\u90e8\u505astrlen\uff09\uff0c\u8fd4\u56de\u7684\u662fitem\u7ed3\u6784\u6307\u9488\uff0c\u5b83\u7684\u6570\u636e\u5730\u5740\u5728slab\u4e2d\u7684\u67d0\u4e2achunk\u4e0a\u3002<\/p>\n

items.c\u662f\u6570\u636e\u9879\u7684\u64cd\u4f5c\u7a0b\u5e8f\uff0c\u6bcf\u4e00\u4e2a\u5b8c\u6574\u7684item\u5305\u62ec\u51e0\u4e2a\u90e8\u5206\uff0c\u5728item_make_header()\u4e2d\u5b9a\u4e49\u4e3a\uff1a<\/p>\n

key\uff1a\u952e
nkey\uff1a\u952e\u957f
flags\uff1a\u7528\u6237\u5b9a\u4e49\u7684flag\uff08\u5176\u5b9e\u8fd9\u4e2aflag\u5728memcached\u4e2d\u6ca1\u6709\u542f\u7528\uff09
nbytes\uff1a\u503c\u957f\uff08\u5305\u62ec\u6362\u884c\u7b26\u53f7\r\n\uff09
suffix\uff1a\u540e\u7f00Buffer
nsuffix\uff1a\u540e\u7f00\u957f<\/p>\n

\u4e00\u4e2a\u5b8c\u6574\u7684item\u957f\u5ea6\u662f\u952e\u957f\uff0b\u503c\u957f\uff0b\u540e\u7f00\u957f\uff0bitem\u7ed3\u6784\u5927\u5c0f\uff0832\u5b57\u8282\uff09\uff0citem\u64cd\u4f5c\u5c31\u662f\u6839\u636e\u8fd9\u4e2a\u957f\u5ea6\u6765\u8ba1\u7b97slab\u7684classid\u7684\u3002<\/p>\n

hashtable \u4e2d\u7684\u6bcf\u4e00\u4e2a\u6876\u4e0a\u6302\u7740\u4e00\u4e2a\u53cc\u94fe\u8868\uff0citem_init()\u7684\u65f6\u5019\u5df2\u7ecf\u521d\u59cb\u5316\u4e86heads\u3001tails\u3001sizes\u4e09\u4e2a\u6570\u7ec4\u4e3a0\uff0c\u8fd9\u4e09\u4e2a\u6570\u7ec4\u7684\u5927\u5c0f\u90fd\u4e3a\u5e38\u91cf LARGEST_ID\uff08\u9ed8\u8ba4\u4e3a255\uff0c\u8fd9\u4e2a\u503c\u9700\u8981\u914d\u5408factor\u6765\u4fee\u6539\uff09\uff0c\u5728\u6bcf\u6b21item_assoc()\u7684\u65f6\u5019\uff0c\u5b83\u4f1a\u9996\u5148\u5c1d\u8bd5\u4eceslab\u4e2d\u83b7\u53d6\u4e00\u5757\u7a7a\u95f2\u7684chunk\uff0c\u5982\u679c\u6ca1\u6709\u53ef\u7528\u7684chunk\uff0c\u4f1a\u5728\u94fe\u8868\u4e2d\u626b\u63cf50\u6b21\uff0c\u4ee5\u5f97\u5230\u4e00\u4e2a\u88abLRU\u8e22\u6389\u7684item\uff0c\u5c06\u5b83unlink\uff0c\u7136\u540e\u5c06\u9700\u8981\u63d2\u5165\u7684item\u63d2\u5165\u94fe\u8868\u4e2d\u3002<\/p>\n

\u6ce8\u610fitem\u7684refcount\u6210\u5458\u3002item\u88abunlink\u4e4b\u540e\u53ea\u662f\u4ece\u94fe\u8868\u4e0a\u6458\u6389\uff0c\u4e0d\u662f\u7acb\u523b\u5c31\u88abfree\u7684\uff0c\u53ea\u662f\u5c06\u5b83\u653e\u5230\u5220\u9664\u961f\u5217\u4e2d\uff08item_unlink_q()\u51fd\u6570\uff09\u3002<\/p>\n

item\u5bf9\u5e94\u4e00\u4e9b\u8bfb\u5199\u64cd\u4f5c\uff0c\u5305\u62ecremove\u3001update\u3001replace\uff0c\u5f53\u7136\u6700\u91cd\u8981\u7684\u5c31\u662falloc\u64cd\u4f5c\u3002<\/p>\n

item \u8fd8\u6709\u4e00\u4e2a\u7279\u6027\u5c31\u662f\u5b83\u6709\u8fc7\u671f\u65f6\u95f4\uff0c\u8fd9\u662fmemcached\u7684\u4e00\u4e2a\u5f88\u6709\u7528\u7684\u7279\u6027\uff0c\u5f88\u591a\u5e94\u7528\u90fd\u662f\u4f9d\u8d56\u4e8ememcached\u7684item\u8fc7\u671f\uff0c\u6bd4\u5982session\u5b58\u50a8\u3001\u64cd\u4f5c\u9501\u7b49\u3002item_flush_expired()\u51fd\u6570\u5c31\u662f\u626b\u63cf\u8868\u4e2d\u7684item\uff0c\u5bf9\u8fc7\u671f\u7684item\u6267\u884cunlink\u64cd\u4f5c\uff0c\u5f53\u7136\u8fd9\u53ea\u662f\u4e00\u4e2a\u56de\u6536\u52a8\u4f5c\uff0c\u5b9e\u9645\u4e0a\u5728get\u7684\u65f6\u5019\u8fd8\u8981\u8fdb\u884c\u65f6\u95f4\u5224\u65ad\uff1a<\/p>\n

CODE:
\/* expires items that are more recent than the oldest_live setting. *\/
void item_flush_expired() {
    int i;  
    item *iter, *next;
    if (! settings.oldest_live)
        return;
    for (i = 0; i < LARGEST_ID; i++) {
        \/* The LRU is sorted in decreasing time order, and an item's timestamp
         * is never newer than its last access time, so we only need to walk
         * back until we hit an item older than the oldest_live time.
         * The oldest_live checking will auto-expire the remaining items.
         *\/
        for (iter = heads; iter != NULL; iter = next) {
            if (iter->time >= settings.oldest_live) {
                next = iter->next;
                if ((iter->it_flags & ITEM_SLABBED) == 0) {
                    item_unlink(iter);
                }      
            } else {
                \/* We've hit the first old item. Continue to the next queue. *\/
                break;  
            }      
        }      
    }
}<\/p>\n

CODE:
\/* wrapper around assoc_find which does the lazy expiration\/deletion logic *\/
item *get_item_notedeleted(char *key, size_t nkey, int *delete_locked) {
    item *it = assoc_find(key, nkey);
    if (delete_locked) *delete_locked = 0;
    if (it && (it->it_flags & ITEM_DELETED)) {
        \/* it's flagged as delete-locked.  let's see if that condition
           is past due, and the 5-second delete_timer just hasn't
           gotten to it yet… *\/
        if (! item_delete_lock_over(it)) {
            if (delete_locked) *delete_locked = 1;
            it = 0;
        }      
    }
    if (it && settings.oldest_live && settings.oldest_live <= current_time &&
        it->time <= settings.oldest_live) {
        item_unlink(it);
        it = 0;
    }
    if (it && it->exptime && it->exptime <= current_time) {
        item_unlink(it);
        it = 0;
    }
    return it;
}
Memcached\u7684\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f\u662f\u975e\u5e38\u7cbe\u5de7\u548c\u9ad8\u6548\u7684\uff0c\u5b83\u5f88\u5927\u7a0b\u5ea6\u4e0a\u51cf\u5c11\u4e86\u76f4\u63a5alloc\u7cfb\u7edf\u5185\u5b58\u7684\u6b21\u6570\uff0c\u964d\u4f4e\u51fd\u6570\u5f00\u9500\u548c\u5185\u5b58\u788e\u7247\u4ea7\u751f\u51e0\u7387\uff0c\u867d\u7136\u8fd9\u79cd\u65b9\u5f0f\u4f1a\u9020\u6210\u4e00\u4e9b\u5197\u4f59\u6d6a\u8d39\uff0c\u4f46\u662f\u8fd9\u79cd\u6d6a\u8d39\u5728\u5927\u578b\u7cfb\u7edf\u5e94\u7528\u4e2d\u662f\u5fae\u4e0d\u8db3\u9053\u7684\u3002<\/p>\n

\u25ceMemcached\u7684\u7406\u8bba\u53c2\u6570\u8ba1\u7b97\u65b9\u5f0f<\/p>\n

\u5f71\u54cd memcached \u5de5\u4f5c\u7684\u51e0\u4e2a\u53c2\u6570\u6709\uff1a<\/p>\n

\u5e38\u91cfREALTIME_MAXDELTA 60*60*24*30
\u6700\u592730\u5929\u7684\u8fc7\u671f\u65f6\u95f4<\/p>\n

conn_init()\u4e2d\u7684freetotal\uff08=200\uff09
\u6700\u5927\u540c\u65f6\u8fde\u63a5\u6570<\/p>\n

\u5e38\u91cfKEY_MAX_LENGTH 250
\u6700\u5927\u952e\u957f<\/p>\n

settings.factor\uff08=1.25\uff09
factor\u5c06\u5f71\u54cdchunk\u7684\u6b65\u8fdb\u5927\u5c0f<\/p>\n

settings.maxconns\uff08=1024\uff09
\u6700\u5927\u8f6f\u8fde\u63a5<\/p>\n

settings.chunk_size\uff08=48\uff09
\u4e00\u4e2a\u4fdd\u5b88\u4f30\u8ba1\u7684key+value\u957f\u5ea6\uff0c\u7528\u6765\u751f\u6210id1\u4e2d\u7684chunk\u957f\u5ea6\uff081.2\uff09\u3002id1\u7684chunk\u957f\u5ea6\u7b49\u4e8e\u8fd9\u4e2a\u6570\u503c\u52a0\u4e0aitem\u7ed3\u6784\u4f53\u7684\u957f\u5ea6\uff0832\uff09\uff0c\u5373\u9ed8\u8ba4\u768480\u5b57\u8282\u3002<\/p>\n

\u5e38\u91cfPOWER_SMALLEST 1
\u6700\u5c0fclassid\uff081.2\uff09<\/p>\n

\u5e38\u91cfPOWER_LARGEST 200
\u6700\u5927classid\uff081.2\uff09<\/p>\n

\u5e38\u91cfPOWER_BLOCK 1048576
\u9ed8\u8ba4slab\u5927\u5c0f<\/p>\n

\u5e38\u91cfCHUNK_ALIGN_BYTES (sizeof(void *))
\u4fdd\u8bc1chunk\u5927\u5c0f\u662f\u8fd9\u4e2a\u6570\u503c\u7684\u6574\u6570\u500d\uff0c\u9632\u6b62\u8d8a\u754c\uff08void *\u7684\u957f\u5ea6\u5728\u4e0d\u540c\u7cfb\u7edf\u4e0a\u4e0d\u4e00\u6837\uff0c\u5728\u6807\u51c632\u4f4d\u7cfb\u7edf\u4e0a\u662f4\uff09<\/p>\n

\u5e38\u91cfITEM_UPDATE_INTERVAL 60
\u961f\u5217\u5237\u65b0\u95f4\u9694<\/p>\n

\u5e38\u91cfLARGEST_ID 255
\u6700\u5927item\u94fe\u8868\u6570\uff08\u8fd9\u4e2a\u503c\u4e0d\u80fd\u6bd4\u6700\u5927\u7684classid\u5c0f\uff09<\/p>\n

\u53d8\u91cfhashpower\uff08\u57281.1\u4e2d\u662f\u5e38\u91cfHASHPOWER\uff09
\u51b3\u5b9ahashtable\u7684\u5927\u5c0f<\/p>\n

\u6839\u636e\u4e0a\u9762\u4ecb\u7ecd\u7684\u5185\u5bb9\u53ca\u53c2\u6570\u8bbe\u5b9a\uff0c\u53ef\u4ee5\u8ba1\u7b97\u51fa\u7684\u4e00\u4e9b\u7ed3\u679c\uff1a<\/p>\n

1\u3001\u5728memcached\u4e2d\u53ef\u4ee5\u4fdd\u5b58\u7684item\u4e2a\u6570\u662f\u6ca1\u6709\u8f6f\u4ef6\u4e0a\u9650\u7684\uff0c\u4e4b\u524d\u6211\u7684100\u4e07\u7684\u8bf4\u6cd5\u662f\u9519\u8bef\u7684\u3002
2\u3001\u5047\u8bbeNewHash\u7b97\u6cd5\u78b0\u649e\u5747\u5300\uff0c\u67e5\u627eitem\u7684\u5faa\u73af\u6b21\u6570\u662fitem\u603b\u6570\u9664\u4ee5hashtable\u5927\u5c0f\uff08\u7531hashpower\u51b3\u5b9a\uff09\uff0c\u662f\u7ebf\u6027\u7684\u3002
3\u3001Memcached\u9650\u5236\u4e86\u53ef\u4ee5\u63a5\u53d7\u7684\u6700\u5927item\u662f1MB\uff0c\u5927\u4e8e1MB\u7684\u6570\u636e\u4e0d\u4e88\u7406\u4f1a\u3002
4\u3001Memcached\u7684\u7a7a\u95f4\u5229\u7528\u7387\u548c\u6570\u636e\u7279\u6027\u6709\u5f88\u5927\u7684\u5173\u7cfb\uff0c\u53c8\u4e0eDONT_PREALLOC_SLABS\u5e38\u91cf\u6709\u5173\u3002 \u5728\u6700\u5dee\u60c5\u51b5\u4e0b\uff0c\u6709198\u4e2aslab\u4f1a\u88ab\u6d6a\u8d39\uff08\u6240\u6709item\u90fd\u96c6\u4e2d\u5728\u4e00\u4e2aslab\u4e2d\uff0c199\u4e2aid\u5168\u90e8\u5206\u914d\u6ee1\uff09\u3002<\/p>\n

\u25ceMemcached\u7684\u5b9a\u957f\u4f18\u5316<\/p>\n

\u6839\u636e\u4e0a\u9762\u51e0\u8282\u7684\u63cf\u8ff0\uff0c\u591a\u5c11\u5bf9memcached\u6709\u4e86\u4e00\u4e2a\u6bd4\u8f83\u6df1\u5165\u7684\u8ba4\u8bc6\u3002\u5728\u6df1\u5165\u8ba4\u8bc6\u7684\u57fa\u7840\u4e0a\u624d\u597d\u5bf9\u5b83\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n

Memcached \u672c\u8eab\u662f\u4e3a\u53d8\u957f\u6570\u636e\u8bbe\u8ba1\u7684\uff0c\u6839\u636e\u6570\u636e\u7279\u6027\uff0c\u53ef\u4ee5\u8bf4\u5b83\u662f\u201c\u9762\u5411\u5927\u4f17\u201d\u7684\u8bbe\u8ba1\uff0c\u4f46\u662f\u5f88\u591a\u65f6\u5019\uff0c\u6211\u4eec\u7684\u6570\u636e\u5e76\u4e0d\u662f\u8fd9\u6837\u7684\u201c\u666e\u904d\u201d\uff0c\u5178\u578b\u7684\u60c5\u51b5\u4e2d\uff0c\u4e00\u79cd\u662f\u975e\u5747\u5300\u5206\u5e03\uff0c\u5373\u6570\u636e\u957f\u5ea6\u96c6\u4e2d\u5728\u51e0\u4e2a\u533a\u57df\u5185\uff08\u5982\u4fdd\u5b58\u7528\u6237 Session\uff09\uff1b\u53e6\u4e00\u79cd\u66f4\u6781\u7aef\u7684\u72b6\u6001\u662f\u7b49\u957f\u6570\u636e\uff08\u5982\u5b9a\u957f\u952e\u503c\uff0c\u5b9a\u957f\u6570\u636e\uff0c\u591a\u89c1\u4e8e\u8bbf\u95ee\u3001\u5728\u7ebf\u7edf\u8ba1\u6216\u6267\u884c\u9501\uff09\u3002<\/p>\n

\u8fd9\u91cc\u4e3b\u8981\u7814\u7a76\u4e00\u4e0b\u5b9a\u957f\u6570\u636e\u7684\u4f18\u5316\u65b9\u6848\uff081.2\uff09\uff0c\u96c6\u4e2d\u5206\u5e03\u7684\u53d8\u957f\u6570\u636e\u4ec5\u4f9b\u53c2\u8003\uff0c\u5b9e\u73b0\u8d77\u6765\u4e5f\u5f88\u5bb9\u6613\u3002<\/p>\n

\u89e3\u51b3\u5b9a\u957f\u6570\u636e\uff0c\u9996\u5148\u9700\u8981\u89e3\u51b3\u7684\u662fslab\u7684\u5206\u914d\u95ee\u9898\uff0c\u7b2c\u4e00\u4e2a\u9700\u8981\u786e\u8ba4\u7684\u662f\u6211\u4eec\u4e0d\u9700\u8981\u90a3\u4e48\u591a\u4e0d\u540cchunk\u957f\u5ea6\u7684slab\uff0c\u4e3a\u4e86\u6700\u5927\u9650\u5ea6\u5730\u5229\u7528\u8d44\u6e90\uff0c\u6700\u597dchunk\u548citem\u7b49\u957f\uff0c\u6240\u4ee5\u9996\u5148\u8981\u8ba1\u7b97item\u957f\u5ea6\u3002<\/p>\n

\u5728\u4e4b\u524d\u5df2\u7ecf\u6709\u4e86\u8ba1\u7b97item\u957f\u5ea6\u7684\u7b97\u6cd5\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9664\u4e86\u5b57\u7b26\u4e32\u957f\u5ea6\u5916\uff0c\u8fd8\u8981\u52a0\u4e0aitem\u7ed3\u6784\u7684\u957f\u5ea632\u5b57\u8282\u3002<\/p>\n

\u5047\u8bbe\u6211\u4eec\u5df2\u7ecf\u8ba1\u7b97\u51fa\u9700\u8981\u4fdd\u5b58200\u5b57\u8282\u7684\u7b49\u957f\u6570\u636e\u3002<\/p>\n

\u63a5\u4e0b\u6765\u662f\u8981\u4fee\u6539slab\u7684classid\u548cchunk\u957f\u5ea6\u7684\u5173\u7cfb\u3002\u5728\u539f\u59cb\u7248\u672c\u4e2d\uff0cchunk\u957f\u5ea6\u548cclassid\u662f\u6709\u5bf9\u5e94\u5173\u7cfb\u7684\uff0c\u73b0\u5728\u5982\u679c\u628a\u6240\u6709\u7684 chunk\u90fd\u5b9a\u4e3a200\u4e2a\u5b57\u8282\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5173\u7cfb\u5c31\u4e0d\u5b58\u5728\u4e86\uff0c\u6211\u4eec\u9700\u8981\u91cd\u65b0\u786e\u5b9a\u8fd9\u4e8c\u8005\u7684\u5173\u7cfb\u3002\u4e00\u79cd\u65b9\u6cd5\u662f\uff0c\u6574\u4e2a\u5b58\u50a8\u7ed3\u6784\u53ea\u4f7f\u7528\u4e00\u4e2a\u56fa\u5b9a\u7684id\uff0c\u5373\u53ea\u4f7f\u7528199 \u4e2a\u69fd\u4e2d\u76841\u4e2a\uff0c\u5728\u8fd9\u79cd\u6761\u4ef6\u4e0b\uff0c\u5c31\u4e00\u5b9a\u8981\u5b9a\u4e49DONT_PREALLOC_SLABS\u6765\u907f\u514d\u53e6\u5916\u7684\u9884\u5206\u914d\u6d6a\u8d39\u3002\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u5efa\u7acb\u4e00\u4e2ahash\u5173\u7cfb\uff0c\u6765\u4ece item\u786e\u5b9aclassid\uff0c\u4e0d\u80fd\u4f7f\u7528\u957f\u5ea6\u6765\u505a\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528key\u7684NewHash\u7ed3\u679c\u7b49\u4e0d\u5b9a\u6570\u636e\uff0c\u6216\u8005\u76f4\u63a5\u6839\u636ekey\u6765\u505ahash\uff08\u5b9a\u957f\u6570\u636e\u7684key\u4e5f\u4e00\u5b9a\u7b49\u957f\uff09\u3002\u8fd9\u91cc\u7b80\u5355\u8d77\u89c1\uff0c\u9009\u62e9\u7b2c\u4e00\u79cd\u65b9\u6cd5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7684\u4e0d\u8db3\u4e4b\u5904\u5728\u4e8e\u53ea\u4f7f\u7528\u4e00\u4e2aid\uff0c\u5728\u6570\u636e\u91cf\u975e\u5e38\u5927\u7684\u60c5\u51b5\u4e0b\uff0cslab\u94fe\u4f1a\u5f88\u957f\uff08\u56e0\u4e3a\u6240\u6709\u6570\u636e\u90fd\u6324\u5728\u4e00\u6761\u94fe\u4e0a\u4e86\uff09\uff0c\u904d\u5386\u8d77\u6765\u7684\u4ee3\u4ef7\u6bd4\u8f83\u9ad8\u3002<\/p>\n

\u524d\u9762\u4ecb\u7ecd\u4e86\u4e09\u79cd\u7a7a\u95f4\u5197\u4f59\uff0c\u8bbe\u7f6echunk\u957f\u5ea6\u7b49\u4e8eitem\u957f\u5ea6\uff0c\u89e3\u51b3\u4e86\u7b2c\u4e00\u79cd\u7a7a\u95f4\u6d6a\u8d39\u95ee\u9898\uff0c\u4e0d\u9884\u7533\u8bf7\u7a7a\u95f4\u89e3\u51b3\u4e86\u7b2c\u4e8c\u79cd\u7a7a\u95f4\u6d6a\u8d39\u95ee\u9898\uff0c\u90a3\u4e48\u5bf9\u4e8e\u7b2c\u4e00\u79cd\u95ee\u9898\uff08slab\u5185\u5269\u4f59\uff09\u5982\u4f55\u89e3\u51b3\u5462\uff0c\u8fd9\u5c31\u9700\u8981\u4fee\u6539POWER_BLOCK\u5e38\u91cf\uff0c\u4f7f\u5f97\u6bcf\u4e00\u4e2aslab\u5927\u5c0f\u6b63\u597d\u7b49\u4e8echunk\u957f\u5ea6\u7684\u6574\u6570\u500d\uff0c\u8fd9\u6837\u4e00\u4e2aslab\u5c31\u53ef\u4ee5\u6b63\u597d\u5212\u5206\u6210n\u4e2achunk\u3002\u8fd9\u4e2a\u6570\u503c\u5e94\u8be5\u6bd4\u8f83\u63a5\u8fd11MB\uff0c\u8fc7\u5927\u7684\u8bdd\u540c\u6837\u4f1a\u9020\u6210\u5197\u4f59\uff0c\u8fc7\u5c0f\u7684\u8bdd\u4f1a\u9020\u6210\u6b21\u6570\u8fc7\u591a\u7684alloc\uff0c\u6839\u636echunk\u957f\u5ea6\u4e3a200\uff0c\u9009\u62e91000000\u4f5c\u4e3aPOWER_BLOCK\u7684\u503c\uff0c\u8fd9\u6837\u4e00\u4e2aslab\u5c31\u662f100\u4e07\u5b57\u8282\uff0c\u4e0d\u662f 1048576\u3002\u4e09\u4e2a\u5197\u4f59\u95ee\u9898\u90fd\u89e3\u51b3\u4e86\uff0c\u7a7a\u95f4\u5229\u7528\u7387\u4f1a\u5927\u5927\u63d0\u5347\u3002<\/p>\n

\u4fee\u6539 slabs_clsid \u51fd\u6570\uff0c\u8ba9\u5b83\u76f4\u63a5\u8fd4\u56de\u4e00\u4e2a\u5b9a\u503c\uff08\u6bd4\u5982 1 \uff09\uff1a<\/p>\n

CODE:
unsigned int slabs_clsid(size_t size) {
        return 1;
}
\u4fee\u6539slabs_init\u51fd\u6570\uff0c\u53bb\u6389\u5faa\u73af\u521b\u5efa\u6240\u6709classid\u5c5e\u6027\u7684\u90e8\u5206\uff0c\u76f4\u63a5\u6dfb\u52a0slabclass[1]\uff1a<\/p>\n

CODE:
slabclass[1].size = 200;                \/\/\u6bcfchunk200\u5b57\u8282
slabclass[1].perslab = 5000;        \/\/1000000\/200
\u25ceMemcached\u5ba2\u6237\u7aef<\/p>\n

Memcached\u662f\u4e00\u4e2a\u670d\u52a1\u7a0b\u5e8f\uff0c\u4f7f\u7528\u7684\u65f6\u5019\u53ef\u4ee5\u6839\u636e\u5b83\u7684\u534f\u8bae\uff0c\u8fde\u63a5\u5230 memcached\u670d\u52a1\u5668\u4e0a\uff0c\u53d1\u9001\u547d\u4ee4\u7ed9\u670d\u52a1\u8fdb\u7a0b\uff0c\u5c31\u53ef\u4ee5\u64cd\u4f5c\u4e0a\u9762\u7684\u6570\u636e\u3002\u4e3a\u4e86\u65b9\u4fbf\u4f7f\u7528\uff0cmemcached\u6709\u5f88\u591a\u4e2a\u5ba2\u6237\u7aef\u7a0b\u5e8f\u53ef\u4ee5\u4f7f\u7528\uff0c\u5bf9\u5e94\u4e8e\u5404\u79cd\u8bed\u8a00\uff0c\u6709\u5404\u79cd\u8bed\u8a00\u7684\u5ba2\u6237\u7aef\u3002\u57fa\u4e8eC\u8bed\u8a00\u7684\u6709libmemcache\u3001APR_Memcache\uff1b\u57fa\u4e8ePerl\u7684\u6709Cache::Memcached\uff1b\u53e6\u5916\u8fd8\u6709Python\u3001Ruby\u3001Java\u3001C#\u7b49\u8bed\u8a00\u7684\u652f\u6301\u3002PHP\u7684\u5ba2\u6237\u7aef\u662f\u6700\u591a\u7684\uff0c\u4e0d\u5149\u6709mcache\u548cPECL memcache\u4e24\u4e2a\u6269\u5c55\uff0c\u8fd8\u6709\u5927\u628a\u7684\u7531PHP\u7f16\u5199\u7684\u5c01\u88c5\u7c7b\uff0c\u4e0b\u9762\u4ecb\u7ecd\u4e00\u4e0b\u5728PHP\u4e2d\u4f7f\u7528memcached\u7684\u65b9\u6cd5\uff1a<\/p>\n

mcache\u6269\u5c55\u662f\u57fa\u4e8elibmemcache\u518d\u5c01\u88c5\u7684libmemcache\u4e00\u76f4\u6ca1\u6709\u53d1\u5e03stable\u7248\u672c\uff0c\u76ee\u524d\u7248\u672c\u662f1.4.0-rc2\uff0c\u53ef\u4ee5\u5728\u8fd9\u91cc\u627e\u5230\u3002 libmemcache\u6709\u4e00\u4e2a\u5f88\u4e0d\u597d\u7684\u7279\u6027\uff0c\u5c31\u662f\u4f1a\u5411stderr\u5199\u5f88\u591a\u9519\u8bef\u4fe1\u606f\uff0c\u4e00\u822c\u7684\uff0c\u4f5c\u4e3alib\u4f7f\u7528\u7684\u65f6\u5019\uff0cstderr\u4e00\u822c\u90fd\u4f1a\u88ab\u5b9a\u5411\u5230\u5176\u5b83\u5730\u65b9\uff0c\u6bd4\u5982Apache\u7684\u9519\u8bef\u65e5\u5fd7\uff0c\u800c\u4e14libmemcache\u4f1a\u81ea\u6740\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5f02\u5e38\uff0c\u4e0d\u8fc7\u5b83\u7684\u6027\u80fd\u8fd8\u662f\u5f88\u597d\u7684\u3002<\/p>\n

mcache\u6269\u5c55\u6700\u540e\u66f4\u65b0\u52301.2.0-beta10\uff0c\u4f5c\u8005\u5927\u6982\u662f\u79bb\u804c\u4e86\uff0c\u4e0d\u5149\u505c\u6b62\u66f4\u65b0\uff0c\u8fde\u7f51\u7ad9\u4e5f\u6253\u4e0d\u5f00\u4e86\uff08~_~\uff09\uff0c\u53ea\u80fd\u5230\u5176\u5b83\u5730\u65b9\u53bb\u83b7\u53d6\u8fd9\u4e2a\u4e0d\u8d1f\u8d23\u7684\u6269\u5c55\u4e86\u3002\u89e3\u538b\u540e\u5b89\u88c5\u65b9\u6cd5\u5982\u5e38\uff1aphpize & configure & make & make install\uff0c\u4e00\u5b9a\u8981\u5148\u5b89\u88c5libmemcache\u3002\u4f7f\u7528\u8fd9\u4e2a\u6269\u5c55\u5f88\u7b80\u5355\uff1a<\/p>\n

CODE:
$mc = memcache();    \/\/ \u521b\u5efa\u4e00\u4e2amemcache\u8fde\u63a5\u5bf9\u8c61\uff0c\u6ce8\u610f\u8fd9\u91cc\u4e0d\u662f\u7528new\uff01
$mc->add_server('localhost', 11211);    \/\/ \u6dfb\u52a0\u4e00\u4e2a\u670d\u52a1\u8fdb\u7a0b
$mc->add_server('localhost', 11212);    \/\/ \u6dfb\u52a0\u7b2c\u4e8c\u4e2a\u670d\u52a1\u8fdb\u7a0b
$mc->set('key1', 'Hello');    \/\/ \u5199\u5165key1 => Hello
$mc->set('key2', 'World', 10);    \/\/ \u5199\u5165key2 => World\uff0c10\u79d2\u8fc7\u671f
$mc->set('arr1', array('Hello', 'World'));    \/\/ \u5199\u5165\u4e00\u4e2a\u6570\u7ec4
$key1 = $mc->get('key1');    \/\/ \u83b7\u53d6'key1'\u7684\u503c\uff0c\u8d4b\u7ed9$key1
$key2 = $mc->get('key2');    \/\/ \u83b7\u53d6'key2'\u7684\u503c\uff0c\u8d4b\u7ed9$key2\uff0c\u5982\u679c\u8d85\u8fc710\u79d2\uff0c\u5c31\u53d6\u4e0d\u5230\u4e86
$arr1 = $mc->get('arr1');    \/\/ \u83b7\u53d6'arr1'\u6570\u7ec4
$mc->delete('arr1');    \/\/ \u5220\u9664'arr1'
$mc->flush_all();    \/\/ \u5220\u6389\u6240\u6709\u6570\u636e
$stats = $mc->stats();    \/\/ \u83b7\u53d6\u670d\u52a1\u5668\u4fe1\u606f
var_dump($stats);    \/\/ \u670d\u52a1\u5668\u4fe1\u606f\u662f\u4e00\u4e2a\u6570\u7ec4
?>
\u8fd9\u4e2a\u6269\u5c55\u7684\u597d\u5904\u662f\u53ef\u4ee5\u5f88\u65b9\u4fbf\u5730\u5b9e\u73b0\u5206\u5e03\u5f0f\u5b58\u50a8\u548c\u8d1f\u8f7d\u5747\u8861\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u6dfb\u52a0\u591a\u4e2a\u670d\u52a1\u5730\u5740\uff0c\u6570\u636e\u5728\u4fdd\u5b58\u7684\u65f6\u5019\u662f\u4f1a\u6839\u636ehash\u7ed3\u679c\u5b9a\u4f4d\u5230\u67d0\u53f0\u670d\u52a1\u5668\u4e0a\u7684\uff0c\u8fd9\u4e5f\u662flibmemcache\u7684\u7279\u6027\u3002libmemcache\u652f\u6301\u96c6\u4e2dhash\u65b9\u5f0f\uff0c\u5305\u62ecCRC32\u3001ELF\u548cPerl hash\u3002<\/p>\n

PECL memcache\u662fPECL\u53d1\u5e03\u7684\u6269\u5c55\uff0c\u76ee\u524d\u6700\u65b0\u7248\u672c\u662f2.1.0\uff0c\u53ef\u4ee5\u5728pecl\u7f51\u7ad9\u5f97\u5230\u3002memcache\u6269\u5c55\u7684\u4f7f\u7528\u65b9\u6cd5\u53ef\u4ee5\u5728\u65b0\u4e00\u4e9b\u7684PHP\u624b\u518c\u4e2d\u627e\u5230\uff0c\u5b83\u548cmcache\u5f88\u50cf\uff0c\u771f\u7684\u5f88\u50cf\uff1a<\/p>\n

CODE:
$memcache->connect('localhost', 11211) or die (“Could not connect”);<\/p>\n

$version = $memcache->getVersion();
echo “Server's version: “.$version.”n”;<\/p>\n

$tmp_object = new stdClass;
$tmp_object->str_attr = 'test';
$tmp_object->int_attr = 123;<\/p>\n

$memcache->set('key', $tmp_object, false, 10) or die (“Failed to save data at the server”);
echo “Store data in the cache (data will expire in 10 seconds)n”;<\/p>\n

$get_result = $memcache->get('key');
echo “Data from the cache:n”;<\/p>\n

var_dump($get_result);<\/p>\n

?>
\u8fd9\u4e2a\u6269\u5c55\u662f\u4f7f\u7528php\u7684stream\u76f4\u63a5\u8fde\u63a5memcached\u670d\u52a1\u5668\u5e76\u901a\u8fc7socket\u53d1\u9001\u547d\u4ee4\u7684\u3002\u5b83\u4e0d\u50cflibmemcache\u90a3\u6837\u5b8c\u5584\uff0c\u4e5f\u4e0d\u652f\u6301 add_server\u8fd9\u79cd\u5206\u5e03\u64cd\u4f5c\uff0c\u4f46\u662f\u56e0\u4e3a\u5b83\u4e0d\u4f9d\u8d56\u5176\u5b83\u7684\u5916\u754c\u7a0b\u5e8f\uff0c\u517c\u5bb9\u6027\u8981\u597d\u4e00\u4e9b\uff0c\u4e5f\u6bd4\u8f83\u7a33\u5b9a\u3002\u81f3\u4e8e\u6548\u7387\uff0c\u5dee\u522b\u4e0d\u662f\u5f88\u5927\u3002<\/p>\n

\u53e6\u5916\uff0c\u6709\u5f88\u591a\u7684PHP class\u53ef\u4ee5\u4f7f\u7528\uff0c\u6bd4\u5982MemcacheClient.inc.php\uff0cphpclasses.org\u4e0a\u53ef\u4ee5\u627e\u5230\u5f88\u591a\uff0c\u4e00\u822c\u90fd\u662f\u5bf9perl client API\u7684\u518d\u5c01\u88c5\uff0c\u4f7f\u7528\u65b9\u5f0f\u5f88\u50cf\u3002<\/p>\n

\u25ceBSM_Memcache<\/p>\n

\u4ece C client\u6765\u8bf4\uff0cAPR_Memcache\u662f\u4e00\u4e2a\u5f88\u6210\u719f\u5f88\u7a33\u5b9a\u7684client\u7a0b\u5e8f\uff0c\u652f\u6301\u7ebf\u7a0b\u9501\u548c\u539f\u5b50\u7ea7\u64cd\u4f5c\uff0c\u4fdd\u8bc1\u8fd0\u884c\u7684\u7a33\u5b9a\u6027\u3002\u4e0d\u8fc7\u5b83\u662f\u57fa\u4e8eAPR\u7684\uff08APR\u5c06\u5728\u6700\u540e\u4e00\u8282\u4ecb\u7ecd\uff09\uff0c\u6ca1\u6709libmemcache\u7684\u5e94\u7528\u8303\u56f4\u5e7f\uff0c\u76ee\u524d\u4e5f\u6ca1\u6709\u5f88\u591a\u57fa\u4e8e\u5b83\u5f00\u53d1\u7684\u7a0b\u5e8f\uff0c\u73b0\u6709\u7684\u591a\u662f\u4e00\u4e9bApache Module\uff0c\u56e0\u4e3a\u5b83\u4e0d\u80fd\u8131\u79bbAPR\u73af\u5883\u8fd0\u884c\u3002\u4f46\u662fAPR\u5012\u662f\u53ef\u4ee5\u8131\u79bbApache\u5355\u72ec\u5b89\u88c5\u7684\uff0c\u5728APR\u7f51\u7ad9\u4e0a\u53ef\u4ee5\u4e0b\u8f7dAPR\u548cAPR-util\uff0c\u4e0d\u9700\u8981\u6709Apache\uff0c\u53ef\u4ee5\u76f4\u63a5\u5b89\u88c5\uff0c\u800c\u4e14\u5b83\u662f\u8de8\u5e73\u53f0\u7684\u3002<\/p>\n

BSM_Memcache\u662f\u6211\u5728BS.Magic\u9879\u76ee\u4e2d\u5f00\u53d1\u7684\u4e00\u4e2a\u57fa\u4e8eAPR_Memcache\u7684PHP\u6269\u5c55\uff0c\u8bf4\u8d77\u6765\u6709\u70b9\u62d7\u53e3\uff0c\u81f3\u5c11\u5b83\u628aAPR\u626f\u8fdb\u4e86PHP\u6269\u5c55\u4e2d\u3002\u8fd9\u4e2a\u7a0b\u5e8f\u5f88\u7b80\u5355\uff0c\u4e5f\u6ca1\u505a\u592a\u591a\u7684\u529f\u80fd\uff0c\u53ea\u662f\u4e00\u79cd\u5f62\u5f0f\u7684\u5c1d\u8bd5\uff0c\u5b83\u652f\u6301\u670d\u52a1\u5668\u5206\u7ec4\u3002<\/p>\n

\u548c mcache\u6269\u5c55\u652f\u6301\u591a\u670d\u52a1\u5668\u5206\u5e03\u5b58\u50a8\u4e0d\u540c\uff0cBSM_Memcache\u652f\u6301\u591a\u7ec4\u670d\u52a1\u5668\uff0c\u6bcf\u4e00\u7ec4\u5185\u7684\u670d\u52a1\u5668\u8fd8\u662f\u6309\u7167hash\u65b9\u5f0f\u6765\u5206\u5e03\u4fdd\u5b58\u6570\u636e\uff0c\u4f46\u662f\u4e24\u4e2a\u7ec4\u4e2d\u4fdd\u5b58\u7684\u6570\u636e\u662f\u4e00\u6837\u7684\uff0c\u4e5f\u5c31\u662f\u5b9e\u73b0\u4e86\u70ed\u5907\uff0c\u5b83\u4e0d\u4f1a\u56e0\u4e3a\u4e00\u53f0\u670d\u52a1\u5668\u53d1\u751f\u5355\u70b9\u6545\u969c\u5bfc\u81f4\u6570\u636e\u65e0\u6cd5\u83b7\u53d6\uff0c\u9664\u975e\u6240\u6709\u7684\u670d\u52a1\u5668\u7ec4\u90fd\u635f\u574f\uff08\u4f8b\u5982\u673a\u623f\u505c\u7535\uff09\u3002\u5f53\u7136\u5b9e\u73b0\u8fd9\u4e2a\u529f\u80fd\u7684\u4ee3\u4ef7\u5c31\u662f\u6027\u80fd\u4e0a\u7684\u727a\u7272\uff0c\u5728\u6bcf\u6b21\u6dfb\u52a0\u5220\u9664\u6570\u636e\u7684\u65f6\u5019\u90fd\u8981\u626b\u63cf\u6240\u6709\u7684\u7ec4\uff0c\u5728get\u6570\u636e\u7684\u65f6\u5019\u4f1a\u968f\u673a\u9009\u62e9\u4e00\u7ec4\u670d\u52a1\u5668\u5f00\u59cb\u8f6e\u8be2\uff0c\u4e00\u76f4\u5230\u627e\u5230\u6570\u636e\u4e3a\u6b62\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\u4e00\u6b21\u5c31\u53ef\u4ee5\u83b7\u53d6\u5f97\u5230\u3002<\/p>\n

BSM_Memcache\u53ea\u652f\u6301\u8fd9\u51e0\u4e2a\u51fd\u6570\uff1a<\/p>\n

CODE:
zend_function_entry bsm_memcache_functions[] =
{
    PHP_FE(mc_get,          NULL)
    PHP_FE(mc_set,          NULL)
    PHP_FE(mc_del,          NULL)
    PHP_FE(mc_add_group,    NULL)
    PHP_FE(mc_add_server,   NULL)
    PHP_FE(mc_shutdown,     NULL)
    {NULL, NULL, NULL}
};
mc_add_group\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u6574\u5f62\uff08\u5176\u5b9e\u5e94\u8be5\u662f\u4e00\u4e2aobject\uff0c\u6211\u5077\u61d2\u4e86~_~\uff09\u4f5c\u4e3a\u7ec4ID\uff0cmc_add_server\u7684\u65f6\u5019\u8981\u63d0\u4f9b\u4e24\u4e2a\u53c2\u6570\uff0c\u4e00\u4e2a\u662f\u7ec4ID\uff0c\u4e00\u4e2a\u662f\u670d\u52a1\u5668\u5730\u5740\uff08ADDRORT\uff09\u3002<\/p>\n

CODE:
\/**
* Add a server group
*\/
PHP_FUNCTION(mc_add_group)
{
    apr_int32_t group_id;
    apr_status_t rv;<\/p>\n

    if (0 != ZEND_NUM_ARGS())
    {
        WRONG_PARAM_COUNT;
        RETURN_NULL();
    }<\/p>\n

    group_id = free_group_id();
    if (-1 == group_id)
    {
        RETURN_FALSE;
    }<\/p>\n

    apr_memcache_t *mc;
    rv = apr_memcache_create(p, MAX_G_SERVER, 0, &mc);<\/p>\n

    add_group(group_id, mc);<\/p>\n

    RETURN_DOUBLE(group_id);
}<\/p>\n

CODE:
\/**
* Add a server into group
*\/
PHP_FUNCTION(mc_add_server)
{
    apr_status_t rv;
    apr_int32_t group_id;
    double g;
    char *srv_str;
    int srv_str_l;<\/p>\n

    if (2 != ZEND_NUM_ARGS())
    {
        WRONG_PARAM_COUNT;
    }<\/p>\n

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, “ds”, &g, &srv_str, &srv_str_l) == FAILURE)
    {
        RETURN_FALSE;
    }<\/p>\n

    group_id = (apr_int32_t) g;<\/p>\n

    if (-1 == is_validate_group(group_id))
    {
        RETURN_FALSE;
    }<\/p>\n

    char *host, *scope;
    apr_port_t port;<\/p>\n

    rv = apr_parse_addr_port(&host, &scope, &port, srv_str, p);
    if (APR_SUCCESS == rv)
    {
        \/\/ Create this server object
        apr_memcache_server_t *st;
        rv = apr_memcache_server_create(p, host, port, 0, 64, 1024, 600, &st);
        if (APR_SUCCESS == rv)
        {
            if (NULL == mc_groups[group_id])
            {
                RETURN_FALSE;
            }<\/p>\n

            \/\/ Add server
            rv = apr_memcache_add_server(mc_groups[group_id], st);<\/p>\n

            if (APR_SUCCESS == rv)
            {
                RETURN_TRUE;
            }
        }
    }<\/p>\n

    RETURN_FALSE;
}
\u5728set\u548cdel\u6570\u636e\u7684\u65f6\u5019\uff0c\u8981\u5faa\u73af\u6240\u6709\u7684\u7ec4\uff1a<\/p>\n

CODE:
\/**
* Store item into all groups
*\/
PHP_FUNCTION(mc_set)
{
    char *key, *value;
    int key_l, value_l;
    double ttl = 0;
    double set_ct = 0;<\/p>\n

    if (2 != ZEND_NUM_ARGS())
    {
        WRONG_PARAM_COUNT;
    }<\/p>\n

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, “ss|d”, &key, &key_l, &value, &value_l, ttl) == FAILURE)
    {
        RETURN_FALSE;
    }<\/p>\n

    \/\/ Write data into every object
    apr_int32_t i = 0;
    if (ttl < 0)
    {
        ttl = 0;
    }<\/p>\n

    apr_status_t rv;<\/p>\n

    for (i = 0; i < MAX_GROUP; i++)
    {
        if (0 == is_validate_group(i))
        {
            \/\/ Write it!
            rv = apr_memcache_add(mc_groups, key, value, value_l, (apr_uint32_t) ttl, 0);
            if (APR_SUCCESS == rv)
            {
                set_ct++;
            }
        }
    }<\/p>\n

    RETURN_DOUBLE(set_ct);
}
\u5728mc_get\u4e2d\uff0c\u9996\u5148\u8981\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u7ec4\uff0c\u7136\u540e\u4ece\u8fd9\u4e2a\u7ec4\u5f00\u59cb\u8f6e\u8be2\uff1a
CODE:
\/**
* Fetch a item from a random group
*\/
PHP_FUNCTION(mc_get)
{              
    char *key, *value = NULL;
    int key_l;
    apr_size_t value_l;<\/p>\n

    if (1 != ZEND_NUM_ARGS())
    {
        WRONG_PARAM_COUNT;
    }<\/p>\n

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, “s”, &key, &key_l) == FAILURE)
    {
        RETURN_MULL();
    }
  
    \/\/ I will try …
    \/\/ Random read
    apr_int32_t curr_group_id = random_group();
    apr_int32_t i = 0;
    apr_int32_t try = 0;
    apr_uint32_t flag;
    apr_memcache_t *oper;
    apr_status_t rv;<\/p>\n

    for (i = 0; i < MAX_GROUP; i++)
    {
        try = i + curr_group_id;
        try = try % MAX_GROUP;
        if (0 == is_validate_group(try))
        {
            \/\/ Get a value
            oper = mc_groups[try];
            rv = apr_memcache_getp(mc_groups[try], p, (const char *) key, &value, &value_l, 0);
            if (APR_SUCCESS == rv)
            {
                RETURN_STRING(value, 1);
            }
        }
    }<\/p>\n

    RETURN_FALSE;
}<\/p>\n

CODE:
\/**
* Random group id
* For mc_get()
*\/
apr_int32_t random_group()
{
    struct timeval tv;
    struct timezone tz;
    int usec;<\/p>\n

    gettimeofday(&tv, &tz);<\/p>\n

    usec = tv.tv_usec;<\/p>\n

    int curr = usec % count_group();<\/p>\n

    return (apr_int32_t) curr;
}
BSM_Memcache\u7684\u4f7f\u7528\u65b9\u5f0f\u548c\u5176\u5b83\u7684client\u7c7b\u4f3c\uff1a<\/p>\n

CODE:
$g1 = mc_add_group();    \/\/ \u6dfb\u52a0\u7b2c\u4e00\u4e2a\u7ec4
$g2 = mc_add_group();    \/\/ \u6dfb\u52a0\u7b2c\u4e8c\u4e2a\u7ec4
mc_add_server($g1, 'localhost:11211');    \/\/ \u5728\u7b2c\u4e00\u4e2a\u7ec4\u4e2d\u6dfb\u52a0\u7b2c\u4e00\u53f0\u670d\u52a1\u5668
mc_add_server($g1, 'localhost:11212');    \/\/ \u5728\u7b2c\u4e00\u4e2a\u7ec4\u4e2d\u6dfb\u52a0\u7b2c\u4e8c\u53f0\u670d\u52a1\u5668
mc_add_server($g2, '10.0.0.16:11211');    \/\/ \u5728\u7b2c\u4e8c\u4e2a\u7ec4\u4e2d\u6dfb\u52a0\u7b2c\u4e00\u53f0\u670d\u52a1\u5668
mc_add_server($g2, '10.0.0.17:11211');    \/\/ \u5728\u7b2c\u4e8c\u4e2a\u7ec4\u4e2d\u6dfb\u52a0\u7b2c\u4e8c\u53f0\u670d\u52a1\u5668<\/p>\n

mc_set('key', 'Hello');    \/\/ \u5199\u5165\u6570\u636e
$key = mc_get('key');    \/\/ \u8bfb\u51fa\u6570\u636e
mc_del('key');    \/\/ \u5220\u9664\u6570\u636e
mc_shutdown();    \/\/ \u5173\u95ed\u6240\u6709\u7ec4
?>
APR_Memcache\u7684\u76f8\u5173\u8d44\u6599\u53ef\u4ee5\u5728\u8fd9\u91cc\u627e\u5230\uff0cBSM_Memcache\u53ef\u4ee5\u5728\u672c\u7ad9\u4e0b\u8f7d\u3002<\/p>\n

\u25ceAPR\u73af\u5883\u4ecb\u7ecd<\/p>\n

APR \u7684\u5168\u79f0\uff1aApache Portable Runtime\u3002\u5b83\u662fApache\u8f6f\u4ef6\u57fa\u91d1\u4f1a\u521b\u5efa\u5e76\u7ef4\u6301\u7684\u4e00\u5957\u8de8\u5e73\u53f0\u7684C\u8bed\u8a00\u5e93\u3002\u5b83\u4eceApache httpd1.x\u4e2d\u62bd\u53d6\u51fa\u6765\u5e76\u72ec\u7acb\u4e8ehttpd\u4e4b\u5916\uff0cApache httpd2.x\u5c31\u662f\u5efa\u7acb\u5728APR\u4e0a\u3002APR\u63d0\u4f9b\u4e86\u5f88\u591a\u65b9\u4fbf\u7684API\u63a5\u53e3\u53ef\u4f9b\u4f7f\u7528\uff0c\u5305\u62ec\u5982\u5185\u5b58\u6c60\u3001\u5b57\u7b26\u4e32\u64cd\u4f5c\u3001\u7f51\u7edc\u3001\u6570\u7ec4\u3001hash\u8868\u7b49\u5b9e\u7528\u7684\u529f\u80fd\u3002\u5f00\u53d1 Apache2 Module\u8981\u63a5\u89e6\u5f88\u591aAPR\u51fd\u6570\uff0c\u5f53\u7136APR\u53ef\u4ee5\u72ec\u7acb\u5b89\u88c5\u72ec\u7acb\u7528\uff0c\u53ef\u4ee5\u7528\u6765\u5199\u81ea\u5df1\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u4e0d\u4e00\u5b9a\u662fApache httpd\u7684\u76f8\u5173\u5f00\u53d1\u3002<\/p>\n

\u25ce\u540e\u8bb0<\/p>\n

\u8fd9\u662f\u6211\u5728\u519c\u5386\u4e19\u620c\u5e74\uff08\u6211\u7684\u672c\u547d\u5e74\uff09\u7684\u6700\u540e\u4e00\u7bc7\u6587\u7ae0\uff0c\u7531\u4e8eMemcached\u7684\u5185\u6db5\u5f88\u591a\uff0c\u4ed3\u4fc3\u6574\u7406\u4e00\u5b9a\u6709\u5f88\u591a\u9057\u6f0f\u548c\u9519\u8bef\u3002\u611f\u8c22\u65b0\u6d6a\u7f51\u63d0\u4f9b\u7684\u7814\u7a76\u673a\u4f1a\uff0c\u611f\u8c22\u90e8\u95e8\u540c\u4e8b\u7684\u5e2e\u52a9\u3002<\/p>\n

NP\u535a\u58eb 02-13-2007 <\/p>\n","protected":false},"excerpt":{"rendered":"

Memcached\u662fdanga.com\uff08\u8fd0\u8425LiveJournal\u7684\u6280\u672f\u56e2\u961f\uff09\u5f00\u53d1\u7684\u4e00\u5957\u5206\u5e03\u5f0f\u5185\u5b58\u5bf9\u8c61\u7f13\u5b58\u7cfb\u7edf […]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[4114,2657,392,1881,184],"class_list":["post-1860","post","type-post","status-publish","format-standard","hentry","category-lamp","tag-lamp","tag-memcache","tag-392","tag-1881","tag-184","category-24-id","post-seq-1","post-parity-odd","meta-position-corners","fix"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1860","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1860"}],"version-history":[{"count":0,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1860\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}