{"id":34585,"date":"2023-04-10T18:18:45","date_gmt":"2023-04-11T04:30:54","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e4%bb%8e%e6%ba%90%e4%bb%a3%e7%a0%81%e4%b8%ad%e8%bf%bd%e8%b8%aa%e4%ba%86%e5%9c%a8php%e4%b8%ad%e5%8f%91%e7%94%9f%e7%9a%84memcached%e9%94%99%e8%af%af%e3%80%82\/"},"modified":"2024-04-29T22:52:56","modified_gmt":"2024-04-29T14:52:56","slug":"%e6%88%91%e4%bb%8e%e6%ba%90%e4%bb%a3%e7%a0%81%e4%b8%ad%e8%bf%bd%e8%b8%aa%e4%ba%86%e5%9c%a8php%e4%b8%ad%e5%8f%91%e7%94%9f%e7%9a%84memcached%e9%94%99%e8%af%af%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e4%bb%8e%e6%ba%90%e4%bb%a3%e7%a0%81%e4%b8%ad%e8%bf%bd%e8%b8%aa%e4%ba%86%e5%9c%a8php%e4%b8%ad%e5%8f%91%e7%94%9f%e7%9a%84memcached%e9%94%99%e8%af%af%e3%80%82\/","title":{"rendered":"\u6211\u4ece\u6e90\u4ee3\u7801\u4e2d\u8ffd\u8e2a\u4e86\u5728PHP\u4e2d\u53d1\u751f\u7684Memcached\u9519\u8bef"},"content":{"rendered":"<h1>\u80cc\u666f- Background<\/h1>\n<p>\u5728PHP\u7684Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5f53\u5c06Memcached\u7684\u6269\u5c55\u4eceMemcache\u8fc1\u79fb\u5230Memcached\u65f6\uff0c\u5728\u5e94\u7528\u7a0b\u5e8f\u8c03\u8bd5\u671f\u95f4\uff0c\u6211\u8ffd\u8e2a\u4e86\u53d1\u751f\u7684\u9519\u8bef\u5e76\u786e\u5b9a\u4e86\u9519\u8bef\u7684\u6765\u6e90\u3002<\/p>\n<h1>\u9519\u8bef\u65e5\u5fd7\u7684\u5185\u5bb9<\/h1>\n<pre class=\"post-pre\"><code>error_code -&gt; 37 : ITEM TOO BIG host: array (  'host' =&gt; '\/tmp\/memcache.sock',  'port' =&gt; 0,  'persistent_str' =&gt; '***',) key:***\r\n<\/code><\/pre>\n<p>\u5f53\u5c06\u6269\u5c55\u5207\u6362\u5230Memcached\u65f6\u53d1\u751f\u4e86\u95ee\u9898\u3002\u5728\u4f7f\u7528Memcache\u65f6\u5e76\u6ca1\u6709\u51fa\u73b0\u8fc7\u8fd9\u4e2a\u95ee\u9898\u3002<br \/>\n\u7531\u4e8e\u5207\u6362\u5230Memcached\u662f\u539f\u56e0\uff0c\u9996\u5148\u9700\u8981\u67e5\u627eMemcached\u7684\u6e90\u4ee3\u7801\u3002<\/p>\n<h1>\u8c03\u67e5\u7684\u5185\u5bb9<\/h1>\n<h2>PHP\u5185\u7f6e\u7684\u6269\u5c55\u5e93php-memcached<\/h2>\n<p>\u7248\u672c\u53f7\uff1a2.2.0<br \/>\n\u4e0b\u8f7d\u94fe\u63a5\uff1ahttps:\/\/pecl.php.net\/package\/memcached\u3002<\/p>\n<h4>PHP\u7684memcached\u6269\u5c55\u6587\u4ef6php_memcached.c\u3002<\/h4>\n<pre class=\"post-pre\"><code>#include \"php_memcached_private.h\"\r\n<\/code><\/pre>\n<h4>php_memcached_private.h \u7684\u4e2d\u6587\u91ca\u4e49\u662f\u4ec0\u4e48?<\/h4>\n<pre class=\"post-pre\"><code>#include \"php_libmemcached_compat.h\"\r\n<\/code><\/pre>\n<h4>php_libmemcached_compat.h\u7684\u7ffb\u8bd1\u4e3a\uff1aphp_libmemcached_compat.h<\/h4>\n<pre class=\"post-pre\"><code>#include &lt;libmemcached\/memcached.h&gt;\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u8c03\u67e5\u53d1\u73b0\uff0c\u6b63\u5728\u4f7f\u7528libmemcached\u5e93\u3002<br \/>\nphp-memcached\u4f3c\u4e4e\u662f\u7528\u4e8ephp\u7684libmemcached\u5305\u88c5\u5668\uff0c\u6240\u4ee5\u4e0b\u4e00\u6b65\u662f\u8c03\u67e5libmemcached\u672c\u8eab\u3002<\/p>\n<h2>libmemcached -&gt; LibMemcached<\/h2>\n<p>\u7248\u672c\uff1a1.0.18<br \/>\n\u4e0b\u8f7d\u94fe\u63a5\uff1ahttps:\/\/launchpad.net\/libmemcached\/+download<\/p>\n<h4>libmemcached\/strerror.cc\u53ef\u4ee5\u8fdb\u884c\u91cd\u8ff0\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/h4>\n<p>libmemcached\/strerror.cc\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>#include &lt;libmemcached\/common.h&gt;\r\n\uff5e\u4e2d\u7565\uff5e\r\nconst char *memcached_strerror(const memcached_st *, memcached_return_t rc)\r\n{\r\n  switch (rc)\r\n  {\r\n  \uff5e\u4e2d\u7565\uff5e\r\n  case MEMCACHED_E2BIG:\r\n    return \"ITEM TOO BIG\";\r\n  \uff5e\u4e2d\u7565\uff5e\r\n}\r\n<\/code><\/pre>\n<p>\u6bd4\u8f83\u4eceMemcached\u670d\u52a1\u5668\u8fd4\u56de\u7684\u8fd4\u56de\u7801rc\u7684\u503c\u4e0e\u5e38\u6570\uff0c\u5e76\u8fd4\u56de\u76f8\u5e94\u7684\u6d88\u606f\u3002<br \/>\n\u5f53rc\u7684\u503c\u4e3aMEMCACHED_E2BIG\u65f6\uff0c\u8fd4\u56de\u6d88\u606f&#8221;ITEM TOO BIG&#8221;\u3002<br \/>\n\u73b0\u5728\u5df2\u7ecf\u53d1\u73b0\u6d88\u606f\u6b63\u6587\u5b58\u50a8\u5728libmemcached\u4e2d\u3002<br \/>\n\u63a5\u4e0b\u6765\u5bfb\u627eMEMCACHED_E2BIG\u7684\u5b9a\u4e49\u4f4d\u7f6e\u3002<\/p>\n<h4>libmemcached\/common.h\u53ef\u4ee5\u8fdb\u884c\u5982\u4e0b\u4e2d\u6587\u7ffb\u8bd1\uff1a<\/h4>\n<p>\u516c\u5171\u5e93libmemcached\/common.h<\/p>\n<pre class=\"post-pre\"><code>#include &lt;libmemcached-1.0\/memcached.h&gt; \r\n<\/code><\/pre>\n<h4>libmemcached-1.0\/memcached.h can be paraphrased in Chinese as &#8220;libmemcached-1.0\/memcached.h\u6587\u4ef6&#8221;<\/h4>\n<pre class=\"post-pre\"><code>#include &lt;libmemcached-1.0\/types\/return.h&gt;\r\n<\/code><\/pre>\n<h4>libmemcached-1.0\/types\/return.h\u7684\u91ca\u4e49\u662f\uff1a<\/h4>\n<pre class=\"post-pre\"><code>enum memcached_return_t {\r\n  MEMCACHED_SUCCESS,\r\n  MEMCACHED_FAILURE,\r\n  MEMCACHED_HOST_LOOKUP_FAILURE, \/\/ getaddrinfo() and getnameinfo() only\r\n  MEMCACHED_CONNECTION_FAILURE,\r\n  MEMCACHED_CONNECTION_BIND_FAILURE,  \/\/ DEPRECATED, see MEMCACHED_HOST_LOOKUP_FAILURE\r\n  MEMCACHED_WRITE_FAILURE,\r\n  MEMCACHED_READ_FAILURE,\r\n  MEMCACHED_UNKNOWN_READ_FAILURE,\r\n  MEMCACHED_PROTOCOL_ERROR,\r\n  MEMCACHED_CLIENT_ERROR,\r\n  MEMCACHED_SERVER_ERROR, \/\/ Server returns \"SERVER_ERROR\"\r\n  MEMCACHED_ERROR, \/\/ Server returns \"ERROR\"\r\n  MEMCACHED_DATA_EXISTS,\r\n  MEMCACHED_DATA_DOES_NOT_EXIST,\r\n  MEMCACHED_NOTSTORED,\r\n  MEMCACHED_STORED,\r\n  MEMCACHED_NOTFOUND,\r\n  MEMCACHED_MEMORY_ALLOCATION_FAILURE,\r\n  MEMCACHED_PARTIAL_READ,\r\n  MEMCACHED_SOME_ERRORS,\r\n  MEMCACHED_NO_SERVERS,\r\n  MEMCACHED_END,\r\n  MEMCACHED_DELETED,\r\n  MEMCACHED_VALUE,\r\n  MEMCACHED_STAT,\r\n  MEMCACHED_ITEM,\r\n  MEMCACHED_ERRNO,\r\n  MEMCACHED_FAIL_UNIX_SOCKET, \/\/ DEPRECATED\r\n  MEMCACHED_NOT_SUPPORTED,\r\n  MEMCACHED_NO_KEY_PROVIDED, \/* Deprecated. Use MEMCACHED_BAD_KEY_PROVIDED! *\/\r\n  MEMCACHED_FETCH_NOTFINISHED,\r\n  MEMCACHED_TIMEOUT,\r\n  MEMCACHED_BUFFERED,\r\n  MEMCACHED_BAD_KEY_PROVIDED,\r\n  MEMCACHED_INVALID_HOST_PROTOCOL,\r\n  MEMCACHED_SERVER_MARKED_DEAD,\r\n  MEMCACHED_UNKNOWN_STAT_KEY,\r\n  MEMCACHED_E2BIG,\r\n  MEMCACHED_INVALID_ARGUMENTS,\r\n  MEMCACHED_KEY_TOO_BIG,\r\n  MEMCACHED_AUTH_PROBLEM,\r\n  MEMCACHED_AUTH_FAILURE,\r\n  MEMCACHED_AUTH_CONTINUE,\r\n  MEMCACHED_PARSE_ERROR,\r\n  MEMCACHED_PARSE_USER_ERROR,\r\n  MEMCACHED_DEPRECATED,\r\n  MEMCACHED_IN_PROGRESS,\r\n  MEMCACHED_SERVER_TEMPORARILY_DISABLED,\r\n  MEMCACHED_SERVER_MEMORY_ALLOCATION_FAILURE,\r\n  MEMCACHED_MAXIMUM_RETURN, \/* Always add new error code before *\/\r\n  MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE= MEMCACHED_ERROR\r\n};\r\n<\/code><\/pre>\n<p>\u88ab\u5217\u4e3e\u5728\u679a\u4e3e\u4e2d\u3002<\/p>\n<p>\u8fdb\u4e00\u6b65\u641c\u7d22\u8fd4\u56de\u4e86MEMCACHED_E2BIG\u7684\u90e8\u5206\u3002<\/p>\n<h4>libmemcached\/response.cc \u7684\u4e2d\u6587\u91ca\u4e49<\/h4>\n<pre class=\"post-pre\"><code>static memcached_return_t textual_read_one_response(memcached_instance_st* instance,\r\n                                                    char *buffer, const size_t buffer_length,\r\n                                                    memcached_result_st *result)\r\n{\r\n  \uff5e\u4e2d\u7565\uff5e\r\n  switch(buffer[0])\r\n  {\r\n  \uff5e\u4e2d\u7565\uff5e\r\n  case 'S':\r\n    {\r\n      \/\/ STAT\r\n      if (buffer[1] == 'T' and buffer[2] == 'A' and buffer[3] == 'T') \/* STORED STATS *\/\r\n      {\r\n        memcached_server_response_increment(instance);\r\n        return MEMCACHED_STAT;\r\n      }\r\n      \/\/ SERVER_ERROR\r\n      else if (buffer[1] == 'E' and buffer[2] == 'R' and buffer[3] == 'V' and buffer[4] == 'E' and buffer[5] == 'R'\r\n               and buffer[6] == '_'\r\n               and buffer[7] == 'E' and buffer[8] == 'R' and buffer[9] == 'R' and buffer[10] == 'O' and buffer[11] == 'R' )\r\n      {\r\n        if (total_read == memcached_literal_param_size(\"SERVER_ERROR\"))\r\n        {\r\n          return MEMCACHED_SERVER_ERROR;\r\n        }\r\n\r\n        if (total_read &gt;= memcached_literal_param_size(\"SERVER_ERROR object too large for cache\") and\r\n            (memcmp(buffer, memcached_literal_param(\"SERVER_ERROR object too large for cache\")) == 0))\r\n        {\r\n          return MEMCACHED_E2BIG;\r\n        }\r\n\r\n        if (total_read &gt;= memcached_literal_param_size(\"SERVER_ERROR out of memory storing object\") and\r\n            (memcmp(buffer, memcached_literal_param(\"SERVER_ERROR out of memory storing object\")) == 0))\r\n        {\r\n          return MEMCACHED_SERVER_MEMORY_ALLOCATION_FAILURE;\r\n        }\r\n\r\n        \/\/ Move past the basic error message and whitespace\r\n        char *startptr= buffer + memcached_literal_param_size(\"SERVER_ERROR\");\r\n        if (startptr[0] == ' ')\r\n        {\r\n          startptr++;\r\n        }\r\n\r\n        char *endptr= startptr;\r\n        while (*endptr != '\\r' &amp;&amp; *endptr != '\\n') endptr++;\r\n\r\n        return memcached_set_error(*instance, MEMCACHED_SERVER_ERROR, MEMCACHED_AT, startptr, size_t(endptr - startptr));\r\n      }\r\n      \/\/ STORED\r\n      else if (buffer[1] == 'T' and buffer[2] == 'O' and buffer[3] == 'R') \/\/  and buffer[4] == 'E' and buffer[5] == 'D')\r\n      {\r\n        return MEMCACHED_STORED;\r\n      }\r\n    }\r\n    break;\r\n  \uff5e\u4e2d\u7565\uff5e\r\n}\r\n<\/code><\/pre>\n<p>\u5224\u65ad\u6765\u81eaMemcached\u670d\u52a1\u5668\u7684\u54cd\u5e94\u662f\u5426\u5b58\u50a8\u5728\u7f13\u51b2\u533a\u4e2d\uff0c\u5e76\u4e14\u5b83\u4ee5\u201cSERVER_ERROR\u201d\u5f00\u5934\u3002<br \/>\n\u5f53\u8fd4\u56deMEMCACHED_E2BIG\u65f6\uff0c\u6d88\u606f\u662f\u201cSERVER_ERROR object too large for cache\u201d\u65f6\u3002<br \/>\n\u7531\u4e8e\u9700\u8981\u67e5\u770b\u670d\u52a1\u5668\u7aef\u4ee3\u7801\uff0c\u56e0\u6b64\u9700\u8981\u8fdb\u4e00\u6b65\u8c03\u67e5\u3002<\/p>\n<h2>\u7f13\u5b58\u7cfb\u7edf<\/h2>\n<p>\u7248\u672c\uff1a1.4.24<br \/>\n\u4e0b\u8f7d\u94fe\u63a5\uff1ahttp:\/\/memcached.org\/downloads<\/p>\n<h4>memcached.c \u7684\u4e2d\u6587\u91ca\u4e49\u3002<\/h4>\n<pre class=\"post-pre\"><code>static void process_update_command(conn *c, token_t *tokens, const size_t ntokens, int comm, bool handle_cas) {\r\n    char *key;\r\n    size_t nkey;\r\n    unsigned int flags;\r\n    int32_t exptime_int = 0;\r\n    time_t exptime;\r\n    int vlen;\r\n    uint64_t req_cas_id=0;\r\n    item *it;\r\n\r\n    assert(c != NULL);\r\n\r\n    set_noreply_maybe(c, tokens, ntokens);\r\n\r\n    if (tokens[KEY_TOKEN].length &gt; KEY_MAX_LENGTH) {\r\n        out_string(c, \"CLIENT_ERROR bad command line format\");\r\n        return;\r\n    }\r\n\r\n    key = tokens[KEY_TOKEN].value;\r\n    nkey = tokens[KEY_TOKEN].length;\r\n\r\n    if (! (safe_strtoul(tokens[2].value, (uint32_t *)&amp;flags)\r\n           &amp;&amp; safe_strtol(tokens[3].value, &amp;exptime_int)\r\n           &amp;&amp; safe_strtol(tokens[4].value, (int32_t *)&amp;vlen))) {\r\n        out_string(c, \"CLIENT_ERROR bad command line format\");\r\n        return;\r\n    }\r\n\r\n    \/* Ubuntu 8.04 breaks when I pass exptime to safe_strtol *\/\r\n    exptime = exptime_int;\r\n\r\n    \/* Negative exptimes can underflow and end up immortal. realtime() will\r\n       immediately expire values that are greater than REALTIME_MAXDELTA, but less\r\n       than process_started, so lets aim for that. *\/\r\n    if (exptime &lt; 0)\r\n        exptime = REALTIME_MAXDELTA + 1;\r\n\r\n    \/\/ does cas value exist?\r\n    if (handle_cas) {\r\n        if (!safe_strtoull(tokens[5].value, &amp;req_cas_id)) {\r\n            out_string(c, \"CLIENT_ERROR bad command line format\");\r\n            return;\r\n        }\r\n    }\r\n\r\n    vlen += 2;\r\n    if (vlen &lt; 0 || vlen - 2 &lt; 0) {\r\n        out_string(c, \"CLIENT_ERROR bad command line format\");\r\n        return;\r\n    }\r\n\r\n    if (settings.detail_enabled) {\r\n        stats_prefix_record_set(key, nkey);\r\n    }\r\n\r\n    it = item_alloc(key, nkey, flags, realtime(exptime), vlen);\r\n\r\n    if (it == 0) {\r\n        if (! item_size_ok(nkey, flags, vlen))\r\n            out_string(c, \"SERVER_ERROR object too large for cache\");\r\n        else\r\n            out_of_memory(c, \"SERVER_ERROR out of memory storing object\");\r\n        \/* swallow the data line *\/\r\n        c-&gt;write_and_go = conn_swallow;\r\n        c-&gt;sbytes = vlen;\r\n\r\n        \/* Avoid stale data persisting in cache because we failed alloc.\r\n         * Unacceptable for SET. Anywhere else too? *\/\r\n        if (comm == NREAD_SET) {\r\n            it = item_get(key, nkey);\r\n            if (it) {\r\n                item_unlink(it);\r\n                item_remove(it);\r\n            }\r\n        }\r\n\r\n        return;\r\n    }\r\n  \uff5e\u4e2d\u7565\uff5e\r\n}\r\n<\/code><\/pre>\n<p>\u5982\u679citem_size_ok()\u51fd\u6570\u7684\u7ed3\u679c\u4e3a0\uff0c\u5219\u8fd4\u56de&#8221;SERVER_ERROR object too large for cache&#8221;\u7684\u9519\u8bef\u6d88\u606f\u3002\u53c2\u6570nkey\u3001flags\u548cvlen\u662f\u901a\u8fc7process_update_command()\u51fd\u6570\u7684\u53c2\u6570tokens\u83b7\u53d6\u7684\u3002process_update_command()\u51fd\u6570\u662f\u7531process_command()\u51fd\u6570\u8c03\u7528\u7684\u3002process_command()\u51fd\u6570\u4f3c\u4e4e\u662f\u7528\u6765\u89e3\u6790\u53d1\u9001\u5230Memcached\u7684\u547d\u4ee4\u7684\u5904\u7406\u8fc7\u7a0b\u3002\u4ee5\u4e0b\u4ec5\u6458\u5f55\u76f8\u5173\u90e8\u5206\u3002<\/p>\n<pre class=\"post-pre\"><code>static void process_command(conn *c, char *command) {\r\n\r\n    token_t tokens[MAX_TOKENS];\r\n    size_t ntokens;\r\n    int comm;\r\n  \uff5e\u4e2d\u7565\uff5e\r\n\r\n    c-&gt;msgcurr = 0;\r\n    c-&gt;msgused = 0;\r\n    c-&gt;iovused = 0;\r\n    if (add_msghdr(c) != 0) {\r\n        out_of_memory(c, \"SERVER_ERROR out of memory preparing response\");\r\n        return;\r\n    }\r\n\r\n    ntokens = tokenize_command(command, tokens, MAX_TOKENS);\r\n    if (ntokens &gt;= 3 &amp;&amp;\r\n        ((strcmp(tokens[COMMAND_TOKEN].value, \"get\") == 0) ||\r\n         (strcmp(tokens[COMMAND_TOKEN].value, \"bget\") == 0))) {\r\n\r\n        process_get_command(c, tokens, ntokens, false);\r\n\r\n    } else if ((ntokens == 6 || ntokens == 7) &amp;&amp;\r\n               ((strcmp(tokens[COMMAND_TOKEN].value, \"add\") == 0 &amp;&amp; (comm = NREAD_ADD)) ||\r\n                (strcmp(tokens[COMMAND_TOKEN].value, \"set\") == 0 &amp;&amp; (comm = NREAD_SET)) ||\r\n                (strcmp(tokens[COMMAND_TOKEN].value, \"replace\") == 0 &amp;&amp; (comm = NREAD_REPLACE)) ||\r\n                (strcmp(tokens[COMMAND_TOKEN].value, \"prepend\") == 0 &amp;&amp; (comm = NREAD_PREPEND)) ||\r\n                (strcmp(tokens[COMMAND_TOKEN].value, \"append\") == 0 &amp;&amp; (comm = NREAD_APPEND)) )) {\r\n\r\n        process_update_command(c, tokens, ntokens, comm, false);\r\n  \uff5e\u4e2d\u7565\uff5e\r\n}\r\n<\/code><\/pre>\n<p>\u6211\u5728\u8fd9\u91cc\u5bf9`item_size_ok()`\u51fd\u6570\u7ed3\u679c\u4e3a0\u7684\u60c5\u51b5\u611f\u5230\u597d\u5947\uff0c\u6240\u4ee5\u8fdb\u884c\u4e86\u8fdb\u4e00\u6b65\u7684\u8c03\u67e5\u3002<\/p>\n<pre class=\"post-pre\"><code>#include \"memcached.h\"\r\n<\/code><\/pre>\n<h4>memcached.h<\/h4>\n<pre class=\"post-pre\"><code>#include \"slabs.h\"\r\n#include \"items.h\"\r\n<\/code><\/pre>\n<h4>\u7269\u54c1.<\/h4>\n<pre class=\"post-pre\"><code>bool item_size_ok(const size_t nkey, const int flags, const int nbytes) {\r\n    char prefix[40];\r\n    uint8_t nsuffix;\r\n\r\n    size_t ntotal = item_make_header(nkey + 1, flags, nbytes,\r\n                                     prefix, &amp;nsuffix);\r\n    if (settings.use_cas) {\r\n        ntotal += sizeof(uint64_t);\r\n    }\r\n\r\n    return slabs_clsid(ntotal) != 0;\r\n}\r\n<\/code><\/pre>\n<p>slabs_clsid()\u304c0\u4ee5\u5916\u3067\u3042\u308c\u30700\u304c\u8fd4\u308b\u3002<\/p>\n<h4>memcached.h<\/h4>\n<pre class=\"post-pre\"><code>#include \"slabs.h\"\r\n  \uff5e\u4e2d\u7565\uff5e\r\n#define POWER_SMALLEST 1\r\n#define POWER_LARGEST  256 \/* actual cap is 255 *\/\r\n#define CHUNK_ALIGN_BYTES 8\r\n#define MAX_NUMBER_OF_SLAB_CLASSES (63 + 1)\r\n<\/code><\/pre>\n<h4>\u5e73\u677f.c<\/h4>\n<pre class=\"post-pre\"><code>static int power_largest;\r\n  \uff5e\u4e2d\u7565\uff5e\r\nunsigned int slabs_clsid(const size_t size) {\r\n    int res = POWER_SMALLEST;\r\n\r\n    if (size == 0)\r\n        return 0;\r\n    while (size &gt; slabclass[res].size)\r\n        if (res++ == power_largest)     \/* won't fit in the biggest slab *\/\r\n            return 0;\r\n    return res;\r\n}\r\n<\/code><\/pre>\n<p>\u5f53power_largest\u7684\u503c\u8d85\u8fc7\u8bbe\u5b9a\u503c\u65f6\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<br \/>\npower_largest\u662f\u5728slabs_init()\u4e2d\u8fdb\u884c\u521d\u59cb\u5316\u7684\u3002<br \/>\nslabs_init()\u88abmemcached.c\u4e2d\u7684main()\u51fd\u6570\u8c03\u7528\uff0c<br \/>\n\u5e76\u5c06maxbytes\u8bbe\u7f6e\u4e3alimit\u53c2\u6570\uff0c\u5c06factor\u7684\u503c\u8bbe\u7f6e\u4e3afactor\u53c2\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>void slabs_init(const size_t limit, const double factor, const bool prealloc) {\r\n    int i = POWER_SMALLEST - 1;\r\n    unsigned int size = sizeof(item) + settings.chunk_size;\r\n\r\n    mem_limit = limit;\r\n\r\n    if (prealloc) {\r\n        \/* Allocate everything in a big chunk with malloc *\/\r\n        mem_base = malloc(mem_limit);\r\n        if (mem_base != NULL) {\r\n            mem_current = mem_base;\r\n            mem_avail = mem_limit;\r\n        } else {\r\n            fprintf(stderr, \"Warning: Failed to allocate requested memory in\"\r\n                    \" one large chunk.\\nWill allocate in smaller chunks\\n\");\r\n        }\r\n    }\r\n\r\n    memset(slabclass, 0, sizeof(slabclass));\r\n\r\n    while (++i &lt; MAX_NUMBER_OF_SLAB_CLASSES-1 &amp;&amp; size &lt;= settings.item_size_max \/ factor) {\r\n        \/* Make sure items are always n-byte aligned *\/\r\n        if (size % CHUNK_ALIGN_BYTES)\r\n            size += CHUNK_ALIGN_BYTES - (size % CHUNK_ALIGN_BYTES);\r\n\r\n        slabclass[i].size = size;\r\n        slabclass[i].perslab = settings.item_size_max \/ slabclass[i].size;\r\n        size *= factor;\r\n        if (settings.verbose &gt; 1) {\r\n            fprintf(stderr, \"slab class %3d: chunk size %9u perslab %7u\\n\",\r\n                    i, slabclass[i].size, slabclass[i].perslab);\r\n        }\r\n    }\r\n\r\n    power_largest = i;\r\n    slabclass[power_largest].size = settings.item_size_max;\r\n    slabclass[power_largest].perslab = 1;\r\n    if (settings.verbose &gt; 1) {\r\n        fprintf(stderr, \"slab class %3d: chunk size %9u perslab %7u\\n\",\r\n                i, slabclass[i].size, slabclass[i].perslab);\r\n    }\r\n\r\n    \/* for the test suite:  faking of how much we've already malloc'd *\/\r\n    {\r\n        char *t_initial_malloc = getenv(\"T_MEMD_INITIAL_MALLOC\");\r\n        if (t_initial_malloc) {\r\n            mem_malloced = (size_t)atol(t_initial_malloc);\r\n        }\r\n\r\n    }\r\n\r\n    if (prealloc) {\r\n        slabs_preallocate(power_largest);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>MAX_NUMBER_OF_SLAB_CLASSES-1(63)\u306b\u306a\u308b\u307e\u3067\u30b9\u30e9\u30d6\u6bce\u306e\u30b5\u30a4\u30ba\u3092\u8a08\u7b97\u3057\u3066\u3044\u308b\u3002<br \/>\npower_largest\u306e\u5024\u306fMAX_NUMBER_OF_SLAB_CLASSES-1\u3068\u7b49\u3057\u304f\u306a\u308a\u3001<br \/>\n\u3053\u306e\u6642\u306e\u30b5\u30a4\u30ba\u306f\u8a2d\u5b9aitem_size_max\u306e\u5024\u306b\u306a\u308b\u3002<br \/>\n\u8a2d\u5b9a\u521d\u671f\u5316\u306fmemcached.c\u5185\u306esettings_init()\u95a2\u6570\u3067\u884c\u308f\u308c\u3066\u304a\u308a\u3001item_size_max\u306f1024 * 1024 = 1MB\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<h4>\u53ef\u4ee5\u5c06memcached.c\u8fdb\u884c\u6539\u5199\u3002<\/h4>\n<pre class=\"post-pre\"><code>static void settings_init(void) {\r\n    settings.use_cas = true;\r\n    settings.access = 0700;\r\n    settings.port = 11211;\r\n    settings.udpport = 11211;\r\n    \/* By default this string should be NULL for getaddrinfo() *\/\r\n    settings.inter = NULL;\r\n    settings.maxbytes = 64 * 1024 * 1024; \/* default is 64MB *\/\r\n    settings.maxconns = 1024;         \/* to limit connections-related memory to about 5MB *\/\r\n    settings.verbose = 0;\r\n    settings.oldest_live = 0;\r\n    settings.oldest_cas = 0;          \/* supplements accuracy of oldest_live *\/\r\n    settings.evict_to_free = 1;       \/* push old items out of cache when memory runs out *\/\r\n    settings.socketpath = NULL;       \/* by default, not using a unix socket *\/\r\n    settings.factor = 1.25;\r\n    settings.chunk_size = 48;         \/* space for a modest key and value *\/\r\n    settings.num_threads = 4;         \/* N workers *\/\r\n    settings.num_threads_per_udp = 0;\r\n    settings.prefix_delimiter = ':';\r\n    settings.detail_enabled = 0;\r\n    settings.reqs_per_event = 20;\r\n    settings.backlog = 1024;\r\n    settings.binding_protocol = negotiating_prot;\r\n    settings.item_size_max = 1024 * 1024; \/* The famous 1MB upper limit. *\/\r\n    settings.maxconns_fast = false;\r\n    settings.lru_crawler = false;\r\n    settings.lru_crawler_sleep = 100;\r\n    settings.lru_crawler_tocrawl = 0;\r\n    settings.lru_maintainer_thread = false;\r\n    settings.hot_lru_pct = 32;\r\n    settings.warm_lru_pct = 32;\r\n    settings.expirezero_does_not_evict = false;\r\n    settings.hashpower_init = 0;\r\n    settings.slab_reassign = false;\r\n    settings.slab_automove = 0;\r\n    settings.shutdown_command = false;\r\n    settings.tail_repair_time = TAIL_REPAIR_TIME_DEFAULT;\r\n    settings.flush_enabled = true;\r\n    settings.crawls_persleep = 1000;\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u3053\u3067\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u8abf\u67fb\u306f\u4e00\u65e6\u4e2d\u65ad\u3057\u3001\u8d77\u52d5\u4e2d\u306eMemcached\u306e\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<pre class=\"post-pre\"><code>$ echo 'stats settings' | nc localhost 11211 | grep item_size_max\r\nSTAT item_size_max 1048576\r\n<\/code><\/pre>\n<p>\u7684\u786e\u662f1MB\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u5c1d\u8bd5\u7f13\u5b58\u5927\u4e8eitem_size_max\u8bbe\u7f6e\u7684\u5927\u5c0f\u7684\u6570\u636e\u65f6\u51fa\u73b0\u9519\u8bef\u65e5\u5fd7\u3002<br \/>\n\u8bf7\u786e\u4fdd\u5c06\u8d85\u8fc71MB\u7684\u6570\u636e\u907f\u514d\u5b58\u5165Memcached\u3002<\/p>\n<h2>\u586b\u8865<\/h2>\n<p>\u901a\u8fc7\u4f7f\u7528&#8221;-I&#8221;\u9009\u9879\u53ef\u4ee5\u6539\u53d8item_size_max\u7684\u503c\uff0c\u4f46\u662f\u5982\u679c\u5c1d\u8bd5\u8bbe\u7f6e\u8d85\u8fc71MB\u7684\u503c\uff0c\u4f1a\u53d1\u51fa\u8b66\u544a\u3002<br \/>\n$ memcached -u memcached -p 11211 -I 10m<br \/>\n\u8b66\u544a\uff1a\u4e0d\u5efa\u8bae\u8bbe\u7f6e\u8d85\u8fc71MB\u7684item\u6700\u5927\u5927\u5c0f\uff01\u63d0\u9ad8\u6b64\u9650\u5236\u5c06\u589e\u52a0\u6700\u4f4e\u5185\u5b58\u9700\u6c42\uff0c\u964d\u4f4e\u5185\u5b58\u6548\u7387\u3002<\/p>\n<p>\u8b66\u544a\u51fa\u73b0\u5728memcached.c\u6587\u4ef6\u7684main()\u51fd\u6570\u5185\u3002<\/p>\n<h4>memcached.c\u7684\u4e2d\u6587\u7ffb\u8bd1\u4e3a\uff1a\u7f13\u5b58\u8bb0\u5fc6\uff08\u8f6f\u4ef6\uff09\u7684C\u8bed\u8a00\u6587\u4ef6\u3002<\/h4>\n<pre class=\"post-pre\"><code>int main (int argc, char **argv) {\r\n  \uff5e\u4e2d\u7565\uff5e\r\n        case 'I':\r\n            buf = strdup(optarg);\r\n            unit = buf[strlen(buf)-1];\r\n            if (unit == 'k' || unit == 'm' ||\r\n                unit == 'K' || unit == 'M') {\r\n                buf[strlen(buf)-1] = '\\0';\r\n                size_max = atoi(buf);\r\n                if (unit == 'k' || unit == 'K')\r\n                    size_max *= 1024;\r\n                if (unit == 'm' || unit == 'M')\r\n                    size_max *= 1024 * 1024;\r\n                settings.item_size_max = size_max;\r\n            } else {\r\n                settings.item_size_max = atoi(buf);\r\n            }\r\n            if (settings.item_size_max &lt; 1024) {\r\n                fprintf(stderr, \"Item max size cannot be less than 1024 bytes.\\n\");\r\n                return 1;\r\n            }\r\n            if (settings.item_size_max &gt; 1024 * 1024 * 128) {\r\n                fprintf(stderr, \"Cannot set item size limit higher than 128 mb.\\n\");\r\n                return 1;\r\n            }\r\n            if (settings.item_size_max &gt; 1024 * 1024) {\r\n                fprintf(stderr, \"WARNING: Setting item max size above 1MB is not\"\r\n                    \" recommended!\\n\"\r\n                    \" Raising this limit increases the minimum memory requirements\\n\"\r\n                    \" and will decrease your memory efficiency.\\n\"\r\n                );\r\n            }\r\n            free(buf);\r\n            break;\r\n  \uff5e\u4e2d\u7565\uff5e\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u80cc\u666f- Background \u5728PHP\u7684Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5f53\u5c06Memcached\u7684\u6269\u5c55\u4eceMemcache\u8fc1\u79fb\u5230 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-34585","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6211\u4ece\u6e90\u4ee3\u7801\u4e2d\u8ffd\u8e2a\u4e86\u5728PHP\u4e2d\u53d1\u751f\u7684Memcached\u9519\u8bef - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u6211\u4ece\u6e90\u4ee3\u7801\u4e2d\u8ffd\u8e2a\u4e86\u5728php\u4e2d\u53d1\u751f\u7684memcached\u9519\u8bef\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" 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