{"id":718,"date":"2016-11-15T09:23:10","date_gmt":"2016-11-15T01:23:10","guid":{"rendered":"http:\/\/www.ipcpu.com\/?p=718"},"modified":"2016-11-15T09:23:10","modified_gmt":"2016-11-15T01:23:10","slug":"memcache-feature","status":"publish","type":"post","link":"https:\/\/c.ipcpu.com\/2016\/11\/memcache-feature\/","title":{"rendered":"Memcache\u4e13\u9898\u56db\u3001\u9ad8\u7ea7\u8bbe\u7f6e\u548c\u65b0\u7279\u6027"},"content":{"rendered":"

Memcache\u4e13\u9898\u56db\u3001\u9ad8\u7ea7\u8bbe\u7f6e\u548c\u7279\u6027.md<\/p>\n

\u4e00\u3001\u8c03\u6574factor\u6765\u8282\u7701\u5185\u5b58<\/h2>\n

Memcached \u7684\u9ed8\u8ba4\u53c2\u6570\uff08-f\uff09factor\u662f1.25\uff0c\u66fe\u7ecf\u4e3a2\uff0c\u9009\u62e9\u4f7f\u7528\u5408\u9002\u7684factor\uff0c\u53ef\u4ee5\u51cf\u5c11\u5185\u5b58\u6d6a\u8d39<\/p>\n

<\/p>\n

\u503c\u8d8a\u5c0f\uff0cslab\u4e2dchunk size\u5dee\u8ddd\u8d8a\u5c0f\uff0c\u5185\u5b58\u6d6a\u8d39\u8d8a\u5c0f\uff0c1.25\u9002\u5408\u7f13\u5b58\u51e0\u767e\u5b57\u8282\u7684\u5bf9\u8c61\u3002<\/p>\n

\u5efa\u8bae\uff1a\u8ba1\u7b97\u4e00\u4e0b\u6570\u636e\u7684\u9884\u671f\u5e73\u5747\u957f\u5ea6\uff0c\u8c03\u6574factor\uff0c\u4ee5\u83b7\u5f97\u8f83\u9ad8\u7684\u5185\u5b58\u5229\u7528\u7387\u3002<\/p>\n

\u4e8c\u3001\u5e76\u53d1\u95ee\u9898\u548cCAS<\/h2>\n

\u5982\u679c\u60a8\u901a\u8fc7get\u547d\u4ee4\u83b7\u53d6\u4e86\u4e00\u4e2aitem\uff0c\u4fee\u6539\u4e86\u5b83\uff0c\u7136\u540e\u60f3\u628a\u5b83set\u56dememcached\uff0c\u6211\u4eec\u4e0d\u4fdd\u8bc1\u8fd9\u4e2aitem\u6ca1\u6709\u88ab\u5176\u4ed6\u8fdb\u7a0b\u6216\u8005\u5ba2\u6237\u7aef\u64cd\u4f5c\u8fc7\u3002\u8fd9\u5c31\u662f\u8457\u540d\u7684fetch-modify-set\u5bfc\u81f4\u7684\u5e76\u53d1\u95ee\u9898\u3002\u5728\u5e76\u53d1\u7684\u60c5\u51b5\u4e0b\uff0c\u60a8\u4e5f\u53ef\u80fd\u8986\u5199\u4e86\u4e00\u4e2a\u88ab\u5176\u4ed6\u8fdb\u7a0bset\u7684item\uff0c\u4f46\u662f\u8fd9\u4e2a\u8986\u5199\u53ef\u80fd\u5c31\u4ea7\u751f\u4e86\u7ade\u8dd1\u6761\u4ef6\uff0c\u5c31\u5bfc\u81f4\u4e86\u8fc7\u671f\u7684\u6570\u636e\u88ab\u66f4\u65b0\u4e86\u3002<\/p>\n

Memcached 1.2.5\u4ee5\u53ca\u66f4\u9ad8\u7248\u672c\uff0c\u63d0\u4f9b\u4e86gets\u548ccas\u547d\u4ee4\uff0c\u5b83\u4eec\u53ef\u4ee5\u89e3\u51b3\u4e0a\u9762\u7684\u95ee\u9898\u3002<\/p>\n

\u6837\u4f8b\u5982\u4e0b\uff1a<\/p>\n

  1. #@\u83b7\u53d6ipcpu\u5f53\u524d\u503c\u548cid<\/span><\/code><\/li>
  2. [<\/span>root@s03<\/span>.<\/span>ipcpu<\/span>.<\/span>com memcached<\/span>]#<\/span>echo <\/span>-<\/span>e <\/span>\"gets ipcpu\\r\"<\/span> <\/span>|<\/span> nc localhost <\/span>11211<\/span><\/code><\/li>
  3. VALUE ipcpu <\/span>0<\/span> <\/span>3<\/span> <\/span>17379233<\/span><\/code><\/li>
  4. ghi<\/span><\/code><\/li>
  5. END<\/span><\/code><\/li>
  6. #@\u6839\u636eid\uff0c\u5199\u5165\u65b0\u7684\u503c<\/span><\/code><\/li>
  7. [<\/span>root@s03<\/span>.<\/span>ipcpu<\/span>.<\/span>com memcached<\/span>]#<\/span>echo <\/span>-<\/span>e <\/span>\"cas ipcpu 0 0 3 17379233\\r\\n123\\r\"<\/span> <\/span>|<\/span> nc localhost <\/span>11211<\/span><\/code><\/li>
  8. STORED<\/span><\/code><\/li>
  9. #@\u83b7\u53d6ipcpu\u5f53\u524d\u503c\u548cid<\/span><\/code><\/li>
  10. [<\/span>root@s03<\/span>.<\/span>ipcpu<\/span>.<\/span>com memcached<\/span>]#<\/span>echo <\/span>-<\/span>e <\/span>\"gets ipcpu\\r\"<\/span> <\/span>|<\/span> nc localhost <\/span>11211<\/span><\/code><\/li>
  11. VALUE ipcpu <\/span>0<\/span> <\/span>3<\/span> <\/span>17379234<\/span><\/code><\/li>
  12. 123<\/span><\/code><\/li>
  13. END<\/span><\/code><\/li>
  14. #@\u5047\u5982\u4e2d\u95f4\u6709\u4eba\u4fee\u6539\u6b21item<\/span><\/code><\/li>
  15. [<\/span>root@s03<\/span>.<\/span>ipcpu<\/span>.<\/span>com memcached<\/span>]#<\/span>echo <\/span>-<\/span>e <\/span>\"set ipcpu 0 0 3\\r\\nghi\\r\"<\/span> <\/span>|<\/span> nc localhost <\/span>11211<\/span><\/code><\/li>
  16. STORED<\/span><\/code><\/li>
  17. #@\u6839\u636eid\uff0c\u5199\u5165\u65b0\u7684\u503c\u4f1a\u5931\u8d25<\/span><\/code><\/li>
  18. [<\/span>root@s03<\/span>.<\/span>ipcpu<\/span>.<\/span>com memcached<\/span>]#<\/span>echo <\/span>-<\/span>e <\/span>\"cas ipcpu 0 0 3 17379234\\r\\n123\\r\"<\/span> <\/span>|<\/span> nc localhost <\/span>11211<\/span><\/code><\/li>
  19. EXISTS<\/span><\/code><\/li>
  20. [<\/span>root@s03<\/span>.<\/span>ipcpu<\/span>.<\/span>com memcached<\/span>]#<\/span><\/code><\/li><\/ol><\/pre>\n
    \u4e09\u3001\u6570\u636e\u6301\u4e45\u5316<\/h2>\n
    \u56e0\u4e3amemcached\u6570\u636e\u5168\u90fd\u662f\u5b58\u5728\u5185\u5b58\u91cc\uff0c\u91cd\u542f\u4e4b\u540e\u5168\u90e8\u4e22\u5931\uff0c\u56e0\u6b64\u6709\u4e00\u4e9b\u5f00\u6e90\u8f6f\u4ef6\u5bf9\u5176\u8fdb\u884c\u4e86\u6269\u5c55\u3002<\/p>\n
    \u65b0\u6d6a\u5f00\u6e90\u7684memcachedb\u5c31\u662f\u4e00\u6b3e\uff0c\u4f7f\u7528\u4e86Berkeley DB\u4f5c\u4e3a\u6301\u4e45\u5316\u5f15\u64ce\uff0c\u4f46\u8fd9\u6b3e\u8f6f\u4ef6\u5df2\u7ecf\u5f88\u4e45\u6ca1\u6709\u66f4\u65b0\u4e86\u3002<\/p>\n
    \u53e6\u5916redis\u7684\u6301\u4e45\u5316\u7b56\u7565\u6bd4\u8f83\u591a\uff0c\u53ef\u4ee5\u9009\u62e9redis\u4f5c\u4e3a\u66ff\u4ee3\u4ea7\u54c1\u3002<\/p>\n
    \u56db\u3001\u4e3b\u4ece\u590d\u5236<\/h2>\n
    Repcached \u662f\u4e00\u4e2a\u7528\u6765\u5b9e\u73b0 Memcached \u590d\u5236\u529f\u80fd\u7684\u8865\u4e01\u3002\u4f46\u662f\u53ea\u627e\u5230\u4e861.2\u7cfb\u5217memcached\u914d\u5408\u8865\u4e01\uff0c1.4\u7684\u6ca1\u627e\u5230\u3002<\/p>\n
    \u4e94\u3001\u8d85\u65f6\u65f6\u95f4idle_timeout<\/h2>\n
    Memcached\u5bf9\u4e8e\u8fde\u63a5\u4e0a\u6765\u7684\u5ba2\u6237\u7aef\uff0c\u90fd\u4f1a\u5c3d\u91cf\u4fdd\u6301\uff0c\u4e0d\u4f1a\u4e3b\u52a8\u65ad\u5f00\uff0c\u4f46\u6709\u4e9b\u7a0b\u5e8f\u5458\u5199\u7684\u7a0b\u5e8f\u90fd\u4f1a\u5f00\u542f\u65b0\u7684\u8fde\u63a5\uff0c\u5374\u4e0d\u4f1a\u5173\u95ed\u8001\u7684\u8fde\u63a5\u3002\u5bfc\u81f4\u65e0\u7528\u7684\u7a7a\u95f2\u8fde\u63a5\u4ecd\u7136\u5360\u7528\u8d44\u6e90\u3002<\/p>\n
    \u56e0\u6b64\uff0c\u4ece1.4.27\u7248\u672c\u8d77Memcached\u65b0\u589e\u4e86idle_timeout\u53c2\u6570\uff0c\u53ef\u4ee5\u8bbe\u7f6eidle\u65f6\u95f4\uff0c\u9ed8\u8ba4\u4e3a0\uff0c\u4e0d\u4f1a\u4e3b\u52a8\u65ad\u5f00\u3002<\/p>\n
    \u516d\u3001slab_reassign\u548cslab_automove<\/h2>\n
    \u6211\u4eec\u4e4b\u524d\u8bf4\u8fc7memcached\u5df2\u7ecf\u7533\u8bf7\u8fc7\u7684\u5185\u5b58\u4e0d\u4f1a\u91ca\u653e\uff0c\u5047\u5982\u6709\u4e0b\u9762\u4e00\u4e2a\u573a\u666f\uff1a<\/p>\n
    \u4f60\u6709\u4e00\u4e2a64G\u7684\u670d\u52a1\u5668\uff0cmemcached\u7684slab 1 & 2 \u5360\u7528\u4e8660G\uff0c\u8fd8\u5269\u4f594G\u7a7a\u95f4\uff0c\u56e0\u4e3a\u4e1a\u52a1\u9700\u8981\uff0ckey\u7684\u503c\u53d8\u957f\u4e86\uff0c\u4f7f\u7528slab 3 & 4\u3002<\/p>\n
    \u56e0\u4e3a\u4f60\u73b0\u5728\u53ea\u67094G\u5185\u5b58\uff0c\u4e00\u65e6\u8fbe\u52304G\u9650\u5236\uff0cmemcached\u5c31\u4f1a\u5728slab 3 & 4\u5f00\u542fLRU\uff0c\u6e05\u7406\u6700\u8001\u7684\u6570\u636e\uff0c\u800c\u4e0d\u4f1a\u78b0\u89e6slab 1 & 2\u7684\u6570\u636e\u3002<\/p>\n
    \u8fd9\u663e\u7136\u662f\u4e0d\u5408\u7406\u7684\uff0c\u6700\u597d\u7684\u65b9\u6cd5\u662f\u5c06slab 1 & 2\u7684\u6570\u636e\u6e05\u7406\u6389\uff0c\u7a7a\u51fa\u4e00\u4e9b\u5185\u5b58\u6765\u4f7f\u7528\u3002<\/p>\n
    \u4ece1.4.11\u5f00\u59cb\u4f60\u53ef\u4ee5\u5f00\u542fslab_reassign,slab_automove\u6765\u5b9e\u73b0\u4e0a\u9762\u7684\u529f\u80fd\u3002<\/p>\n
    \u8fd9\u4e24\u4e2a\u53c2\u6570\u9700\u8981\u4f7f\u7528\u53c2\u6570\u201c-o modern\u201d \uff081.4.26+\uff09modern\u8fd9\u4e2a\u53c2\u6570\u8fd8\u542f\u7528\u4e86\u5176\u4ed6\u4e00\u4e9b\u5e38\u7528\u7684\u529f\u80fd\u3002<\/p>\n
    slab_reassign<\/strong><\/p>\n
    \u8fd9\u4e2a\u529f\u80fd\u662f\u4e00\u4e2a\u624b\u52a8\u64cd\u4f5c\u7684\u89e6\u53d1\u7684\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n
    1. #@This will allocate 1 page from slab 3 to slab 5.<\/span><\/code><\/li>
    2. echo <\/span>'slabs reassign 3 5'<\/span> <\/span>|<\/span> nc localhost <\/span>11211<\/span>;<\/span><\/code><\/li><\/ol><\/pre>\n
      slab_automove<\/strong><\/p>\n
      \u8fd9\u4e2a\u5c31\u662f\u4e0a\u9762\u529f\u80fd\u7684\u81ea\u52a8\u7248\uff0c\u9ed8\u8ba4\u5f00\u542f\uff0c\u5f53\u5185\u5b58\u4e0d\u8db3\u65f6\u4f1a\u81ea\u52a8\u79fb\u52a8page\uff0c\u5e73\u65f6\u4e0d\u4f1a\u79fb\u52a8\u3002<\/p>\n
      \u56e0\u6b64\u9700\u8981\u7ecf\u5e38\u5173\u6ce8\u4e0b\u6709\u6ca1\u6709Eviciton\u3002<\/p>\n
      \u4e03\u3001WEB\u7ba1\u7406\u5de5\u5177<\/h2>\n
      http:\/\/www.junopen.com\/memadmin\/<\/a><\/p>\n
      http:\/\/lzone.de\/cheat-sheet\/memcached<\/a><\/p>\n
      \u516b\u3001\u5176\u4ed6\u5e38\u89c1\u95ee\u9898<\/h2>\n
      \n
      8.1\u3001memcached\u80fd\u63a5\u53d7\u7684key\u7684\u6700\u5927\u957f\u5ea6\u662f\u591a\u5c11\uff1f<\/p>\n<\/blockquote>\n
      memcached\u80fd\u63a5\u53d7\u7684key\u7684\u6700\u5927\u957f\u5ea6\u662f250\u4e2a\u5b57\u7b26\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c250\u662fmemcached\u670d\u52a1\u5668\u7aef\u5185\u90e8\u7684\u9650\u5236\u3002\u5982\u679c\u4f7f\u7528\u7684Memcached\u5ba2\u6237\u7aef\u652f\u6301\u201dkey\u7684\u524d\u7f00\u201d\u6216\u7c7b\u4f3c\u7279\u6027\uff0c\u90a3\u4e48key\uff08\u524d\u7f00+\u539f\u59cbkey\uff09\u7684\u6700\u5927\u957f\u5ea6\u662f\u53ef\u4ee5\u8d85\u8fc7250\u4e2a\u5b57\u7b26\u7684\u3002\u63a8\u8350\u4f7f\u7528\u8f83\u77ed\u7684key\uff0c\u8fd9\u6837\u53ef\u4ee5\u8282\u7701\u5185\u5b58\u548c\u5e26\u5bbd\u3002<\/p>\n
      \n
      8.2\u3001memcached\u5bf9item\u7684\u8fc7\u671f\u65f6\u95f4\u6709\u4ec0\u4e48\u9650\u5236\uff1f<\/p>\n<\/blockquote>\n
      item\u5bf9\u8c61\u7684\u8fc7\u671f\u65f6\u95f4\u6700\u957f\u53ef\u4ee5\u8fbe\u523030\u5929\u3002memcached\u628a\u4f20\u5165\u7684\u8fc7\u671f\u65f6\u95f4\uff08\u65f6\u95f4\u6bb5\uff09\u89e3\u91ca\u6210\u65f6\u95f4\u70b9\u540e\uff0c\u4e00\u65e6\u5230\u4e86\u8fd9\u4e2a\u65f6\u95f4\u70b9\uff0cmemcached\u5c31\u628aitem\u7f6e\u4e3a\u5931\u6548\u72b6\u6001\uff0c\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u4f46obscure\u7684\u673a\u5236\u3002<\/p>\n
      \u53c2\u8003\u8d44\u6599<\/h2>\n
      http:\/\/paweljaniak.co.za\/2013\/04\/16\/some-memcached-tips\/<\/a> 
      \n      http:\/\/balodeamit.blogspot.jp\/2014\/02\/slab-reallocation-in-memcache.html<\/a> 
      \n      https:\/\/github.com\/memcached\/memcached\/wiki<\/a><\/p>\n
      \u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1aIPCPU-\u7f51\u7edc\u4e4b\u8def<\/a> » Memcache\u4e13\u9898\u56db\u3001\u9ad8\u7ea7\u8bbe\u7f6e\u548c\u65b0\u7279\u6027<\/a><\/p>","protected":false},"excerpt":{"rendered":"
      Memcache\u4e13\u9898\u56db\u3001\u9ad8\u7ea7\u8bbe\u7f6e\u548c\u7279\u6027.md \u4e00\u3001\u8c03\u6574factor\u6765\u8282\u7701\u5185\u5b58 Memcached \u7684\u9ed8\u8ba4\u53c2\u6570\uff08-f\uff09factor\u662f1.25\uff0c\u66fe\u7ecf\u4e3a2\uff0c\u9009\u62e9\u4f7f\u7528\u5408\u9002\u7684factor\uff0c\u53ef\u4ee5\u51cf\u5c11\u5185\u5b58\u6d6a\u8d39 \u503c\u8d8a\u5c0f\uff0cslab\u4e2dchunk size\u5dee\u8ddd\u8d8a\u5c0f\uff0c\u5185\u5b58\u6d6a\u8d39\u8d8a\u5c0f\uff0c1.25\u9002\u5408\u7f13\u5b58\u51e0\u767e\u5b57\u8282\u7684\u5bf9\u8c61\u3002 \u5efa\u8bae\uff1a\u8ba1\u7b97\u4e00\u4e0b\u6570\u636e\u7684\u9884\u671f\u5e73\u5747\u957f\u5ea6\uff0c\u8c03\u6574factor\uff0c\u4ee5\u83b7\u5f97\u8f83\u9ad8\u7684\u5185\u5b58\u5229\u7528\u7387\u3002 \u4e8c\u3001\u5e76\u53d1\u95ee\u9898\u548cCAS \u5982\u679c\u60a8\u901a\u8fc7get\u547d\u4ee4\u83b7\u53d6\u4e86\u4e00\u4e2aitem\uff0c\u4fee\u6539\u4e86\u5b83\uff0c\u7136\u540e\u60f3\u628a\u5b83set\u56dememcached\uff0c\u6211\u4eec\u4e0d\u4fdd\u8bc1\u8fd9\u4e2aitem\u6ca1\u6709\u88ab\u5176\u4ed6\u8fdb\u7a0b\u6216\u8005\u5ba2\u6237\u7aef\u64cd\u4f5c\u8fc7\u3002\u8fd9\u5c31\u662f\u8457\u540d\u7684fetch-modify-set\u5bfc\u81f4\u7684\u5e76\u53d1\u95ee\u9898\u3002\u5728\u5e76\u53d1\u7684\u60c5\u51b5\u4e0b\uff0c\u60a8\u4e5f\u53ef\u80fd\u8986\u5199\u4e86\u4e00\u4e2a\u88ab\u5176\u4ed6\u8fdb\u7a0bset\u7684item\uff0c\u4f46\u662f\u8fd9\u4e2a\u8986\u5199\u53ef\u80fd\u5c31\u4ea7\u751f\u4e86\u7ade\u8dd1\u6761\u4ef6\uff0c\u5c31\u5bfc\u81f4\u4e86\u8fc7\u671f\u7684\u6570\u636e\u88ab\u66f4\u65b0\u4e86\u3002 Memcached 1.2.5\u4ee5\u53ca\u66f4\u9ad8\u7248\u672c\uff0c\u63d0\u4f9b\u4e86gets\u548ccas\u547d\u4ee4\uff0c\u5b83\u4eec\u53ef\u4ee5\u89e3\u51b3\u4e0a\u9762\u7684\u95ee\u9898\u3002 \u6837\u4f8b\u5982\u4e0b\uff1a #@\u83b7\u53d6ipcpu\u5f53\u524d\u503c\u548cid[root@s03.ipcpu.com memcached]#echo -e “gets ipcpu\\r” | nc localhost 11211VALUE ipcpu 0 3 17379233ghiEND#@\u6839\u636eid\uff0c\u5199\u5165\u65b0\u7684\u503c[root@s03.ipcpu.com memcached]#echo -e “cas ipcpu 0 0 3 17379233\\r\\n123\\r” | nc localhost 11211STORED#@\u83b7\u53d6ipcpu\u5f53\u524d\u503c\u548cid[root@s03.ipcpu.com memcached]#echo -e “gets ipcpu\\r” | nc localhost 11211VALUE ipcpu 0 3 17379234123END#@\u5047\u5982\u4e2d\u95f4\u6709\u4eba\u4fee\u6539\u6b21item[root@s03.ipcpu.com memcached]#echo -e “set ipcpu 0 0 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[13],"tags":[115,83,116,17,90,91,93,117,118],"_links":{"self":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/718"}],"collection":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/comments?post=718"}],"version-history":[{"count":0,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/718\/revisions"}],"wp:attachment":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/media?parent=718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/categories?post=718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/tags?post=718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}