{"id":201563,"date":"2025-05-10T12:00:10","date_gmt":"2025-05-10T04:00:10","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201563\/"},"modified":"2025-05-10T12:00:10","modified_gmt":"2025-05-10T04:00:10","slug":"%e4%b8%ba%e5%95%a5redis10%e4%ba%bf%e6%95%b0%e6%8d%ae%e9%87%8f%e5%8f%aa%e8%a6%81100mb%e5%86%85%e5%ad%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201563\/","title":{"rendered":"\u4e3a\u5565Redis10\u4ebf\u6570\u636e\u91cf\u53ea\u8981100MB\u5185\u5b58\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u4e3a\u5565Redis10\u4ebf\u6570\u636e\u91cf\u53ea\u8981100MB\u5185\u5b58\uff1f<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5927\u5bb6\u597d\uff0c\u4eca\u5929\u672c\u4eba\u7ed9\u5927\u5bb6\u5e26\u6765\u6587\u7ae0\u300a\u4e3a\u5565Redis10\u4ebf\u6570\u636e\u91cf\u53ea\u8981100MB\u5185\u5b58\uff1f\u300b<\/span>\uff0c\u6587\u4e2d\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\u5185\u5b58\u3001Redis\u3001\u6570\u636e\u5e93<\/span><\/span>\uff0c\u5982\u679c\u4f60\u5bf9\u6570\u636e\u5e93<\/span>\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u90a3\u5c31\u8bf7\u5404\u4f4d\u670b\u53cb\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427~\u5e0c\u671b\u80fd\u771f\u6b63\u5e2e\u5230\u4f60\u4eec\uff0c\u8c22\u8c22\uff01<\/p>\n

\u672c\u6587\u4e3b\u8981\u548c\u5927\u5bb6\u5206\u4eab\u4e00\u4e0bredis\u7684\u9ad8\u7ea7\u7279\u6027\uff1abit\u4f4d\u64cd\u4f5c\u3002<\/p>\n

\u529b\u6c42\u8ba9\u5927\u5bb6\u5f7b\u5e95\u5b66\u4f1a\u4f7f\u7528redis\u7684bit\u4f4d\u64cd\u4f5c\u5e76\u638c\u63e1\u5176\u5e95\u5c42\u5b9e\u73b0\u539f\u7406\uff01\u4e3b\u8981\u5305\u542b\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n

    \n
  1. \n

     redis\u4f4d\u64cd\u4f5c\u547d\u4ee4\u793a\u4f8b<\/p>\n<\/li>\n

  2. \n

     \u5e95\u5c42\u6570\u636e\u7ed3\u6784\u5206\u6790<\/p>\n<\/li>\n

  3. \n

     \u4e3a\u4ec0\u4e48\u4ed6\u7684\u7b97\u6cd5\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(1)?<\/p>\n<\/li>\n

  4. \n

     10\u4ebf\u6570\u636e\u91cf\u9700\u8981\u591a\u5927\u7684\u5b58\u50a8\u7a7a\u95f4\uff1f<\/p>\n<\/li>\n

  5. \n

     redis\u4f4d\u64cd\u4f5c\u9002\u5408\u54ea\u4e9b\u5e94\u7528\u573a\u666f\uff1f<\/p>\n<\/li>\n<\/ol>\n

    \u672c\u6587redis\u8bd5\u9a8c\u4ee3\u7801\u57fa\u4e8e\u5982\u4e0b\u73af\u5883\uff1a<\/p>\n

    \u64cd\u4f5c\u7cfb\u7edf\uff1aMac OS 64\u4f4d<\/p>\n

    \u7248\u672c\uff1aRedis 5.0.7 64 bit<\/p>\n

    \u8fd0\u884c\u6a21\u5f0f\uff1astandalone mode<\/p>\n

    redis\u4f4d\u64cd\u4f5c<\/p>\n

    reids\u4f4d\u64cd\u4f5c\u4e5f\u53eb\u4f4d\u6570\u7ec4\u64cd\u4f5c\u3001bitmap\uff0c\u5b83\u63d0\u4f9b\u4e86SETBIT\u3001GETBIT\u3001BITCOUNT\u3001BITTOP\u56db\u4e2a\u547d\u4ee4\u7528\u4e8e\u64cd\u4f5c\u4e8c\u8fdb\u5236\u4f4d\u6570\u7ec4\u3002<\/p>\n

    \u5148\u6765\u770b\u4e00\u6ce2\u57fa\u672c\u64cd\u4f5c\u793a\u4f8b<\/p>\n<\/p>\n

    SETBIT<\/strong><\/p>\n

    \u8bed\u6cd5\uff1aSETBIT key offset value<\/strong><\/p>\n

    \u5373\uff1a\u547d\u4ee4 key \u504f\u79fb\u91cf 0\/1<\/strong><\/p>\n

    setbit\u547d\u4ee4\u7528\u4e8e\u5199\u5165\u4f4d\u6570\u7ec4\u6307\u5b9a\u504f\u79fb\u91cf\u7684\u4e8c\u8fdb\u5236\u4f4d\u8bbe\u7f6e\u503c\uff0c\u504f\u79fb\u91cf\u4ece0\u5f00\u59cb\u8ba1\u6570\uff0c\u4e14\u53ea\u5141\u8bb8\u5199\u51651\u6216\u80050\uff0c\u5982\u679c\u5199\u5165\u975e0\u548c1\u7684\u503c\u5219\u5199\u5165\u5931\u8d25\uff1a<\/p>\n<\/p>\n

    GETBIT<\/strong><\/p>\n

    \u8bed\u6cd5\uff1aGETBIT key offset<\/strong><\/p>\n

    \u5373\uff1a\u547d\u4ee4 key \u504f\u79fb\u91cf<\/strong><\/p>\n

    gitbit\u547d\u4ee4\u7528\u4e8e\u83b7\u53d6\u4f4d\u6570\u7ec4\u6307\u5b9a\u504f\u79fb\u91cf\u4e0a\u7684\u4e8c\u8fdb\u5236\u503c\uff1a<\/p>\n<\/p>\n

    BITCOUNT<\/strong><\/p>\n

    \u8bed\u6cd5\uff1aBITCOUNT key<\/strong><\/p>\n

    \u5373\uff1a\u547d\u4ee4 key<\/strong><\/p>\n

    bitcount\u547d\u4ee4\u7528\u4e8e\u83b7\u53d6\u6307\u5b9akey\u7684\u4f4d\u6570\u7ec4\u4e2d\u503c\u4e3a1\u7684\u4e8c\u8fdb\u5236\u4f4d\u7684\u6570\u91cf\uff0c\u4e4b\u524d\u6211\u4eec\u5199\u5165\u4e86\u504f\u79fb\u91cf0\u7684\u503c\u4e3a1\uff0c\u504f\u79fb\u91cf10 \u7684\u503c\u4e3a1\uff0c\u504f\u79fb\u91cf8\u7684\u503c\u4e3a0\uff1a<\/p>\n<\/p>\n

    BITOP<\/strong><\/p>\n

    \u8bed\u6cd5\uff1aBITOP operation destkey key [key…]<\/strong><\/p>\n

    \u5373\uff1a\u547d\u4ee4 \u64cd\u4f5c \u7ed3\u679c\u76ee\u6807key key1 key2 …<\/strong><\/p>\n

    bitop\u547d\u4ee4\u53ef\u4ee5\u5bf9\u591a\u4e2a\u4f4d\u6570\u7ec4\u7684key\u8fdb\u884cand\uff08\u6309\u4f4d\u4e0e\uff09\u3001or\uff08\u6309\u4f4d\u6216\uff09\u3001xor\uff08\u6309\u4f4d\u5f02\u6216\uff09\u8fd0\u7b97\uff0c\u5e76\u5c06\u8fd0\u7b97\u7ed3\u679c\u8bbe\u7f6e\u5230destkey\u4e2d\uff1a<\/p>\n<\/p>\n

    \u5e95\u5c42\u6570\u636e\u7ed3\u6784\u5206\u6790<\/strong><\/p>\n

    SDS\u662fredis\u4e2d\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u53eb\u505a\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32\uff08Simple Dynamic String\uff09\uff0c\u5e76\u4e14\u5b83\u662f\u4e00\u79cd\u4e8c\u8fdb\u5236\u5b89\u5168\u7684\uff0c\u5728\u5927\u591a\u6570\u7684\u60c5\u51b5\u4e0bredis\u4e2d\u7684\u5b57\u7b26\u4e32\u90fd\u7528SDS\u6765\u5b58\u50a8\u3002<\/p>\n

    SDS\u7684\u6570\u636e\u7ed3\u6784\uff1a <\/p>\n<\/p>\n

      \n
    1. \n

      struct sdshdr {  <\/p>\n<\/li>\n

    2. \n

       #\u8bb0\u5f55buff\u6570\u7ec4\u4e2d\u5df2\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf  <\/p>\n<\/li>\n

    3. \n

       #\u4e5f\u662fSDS\u6240\u4fdd\u5b58\u5b57\u7b26\u4e32\u7684\u957f\u5ea6  <\/p>\n<\/li>\n

    4. \n

       int len;  <\/p>\n<\/li>\n

    5. \n

       #\u8bb0\u5f55buff\u6570\u7ec4\u4e2d\u672a\u4f7f\u7528\u5b57\u8282\u7684\u6570\u91cf  <\/p>\n<\/li>\n

    6. \n

       int free;  <\/p>\n<\/li>\n

    7. \n

       #\u5b57\u8282\u6570\u7ec4\uff0c\u5b57\u7b26\u4e32\u5c31\u5b58\u50a8\u5728\u8fd9\u4e2a\u6570\u7ec4\u91cc  <\/p>\n<\/li>\n

    8. \n

       char buff[];  <\/p>\n<\/li>\n

    9. \n

      } <\/p>\n<\/li>\n<\/ol>\n

      \u6570\u636e\u5b58\u50a8\u793a\u4f8b\uff1a<\/p>\n<\/p>\n

      \u56fe\u7247\u6765\u6e90\u300aredis\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u300b<\/p>\n

      SDS\u7684\u4f18\u70b9\uff1a<\/p>\n

        \n
      1. \n

         \u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)<\/p>\n<\/li>\n

      2. \n

         \u675c\u7edd\u7f13\u51b2\u533a\u6ea2\u51fa<\/p>\n<\/li>\n

      3. \n

         \u51cf\u5c11\u4fee\u6539\u5b57\u7b26\u4e32\u957f\u5ea6\u65f6\u5019\u6240\u9700\u7684\u5185\u5b58\u91cd\u5206\u914d\u6b21\u6570<\/p>\n<\/li>\n

      4. \n

         \u4e8c\u8fdb\u5236\u5b89\u5168\u7684API\u64cd\u4f5c<\/p>\n<\/li>\n

      5. \n

         \u517c\u5bb9\u90e8\u5206C\u5b57\u7b26\u4e32\u51fd\u6570<\/p>\n<\/li>\n<\/ol>\n

        \u5173\u4e8eSDS\u7684\u8be6\u7ec6\u4ecb\u7ecd\u8bf7\u5927\u5bb6\u53c2\u9605\u300aredis\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u300b\u4e00\u6587\u3002<\/strong><\/p>\n

        redis\u4e2d\u7684\u4f4d\u6570\u7ec4\u91c7\u7528\u7684\u662fString\u5b57\u7b26\u4e32\u6570\u636e\u683c\u5f0f\u6765\u5b58\u50a8\uff0c\u800c\u5b57\u7b26\u4e32\u5bf9\u8c61\u4f7f\u7528\u7684\u6b63\u662f\u4e0a\u6587\u8bf4\u7684SDS\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32\u6570\u636e\u7ed3\u6784\u3002<\/p>\n<\/p>\n

        \u56fe\u7247\u6765\u6e90\u300aredis\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u300b<\/p>\n

        \u5927\u5bb6\u90fd\u77e5\u9053\u7684\u662f\u4e00\u4e2a\u5b57\u8282\u7528\u7684\u662f8\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u6765\u5b58\u50a8\u7684\uff0c\u4e5f\u5c31\u662f8\u4e2a0\u6216\u80051\uff0c\u5373\u4e00\u4e2a\u5b57\u8282\u53ef\u4ee5\u5b58\u50a8\u5341\u8fdb\u52360~127\u7684\u6570\u5b57\uff0c\u4e5f\u5373\u5305\u542b\u4e86\u6240\u6709\u7684\u6570\u5b57\u3001\u82f1\u6587\u5927\u5c0f\u5199\u5b57\u6bcd\u4ee5\u53ca\u6807\u70b9\u7b26\u53f7\u3002<\/p>\n

        1Byte=8bit
        <\/strong><\/p>\n

        1KB=1024Byte
        <\/strong><\/p>\n

        1MB=1024KB
        <\/strong><\/p>\n

        1GB=1024MB<\/strong><\/p>\n

        \u4f4d\u6570\u7ec4\u5728redis\u5b58\u50a8\u4e16\u754c\u91cc\uff0c\u6bcf\u4e00\u4e2a\u5b57\u8282\u4e5f\u662f8\u4f4d\uff0c\u521d\u59cb\u90fd\u662f\uff1a <\/p>\n<\/p>\n

          \n
        1. \n

          0 0 0 0 0 0 0 0 <\/p>\n<\/li>\n<\/ol>\n

          \u800c\u4f4d\u64cd\u4f5c\u5c31\u662f\u5728\u5bf9\u5e94\u7684offset\u504f\u79fb\u91cf\u4e0a\u8bbe\u7f6e0\u6216\u80051\uff0c\u6bd4\u5982\u5c06\u7b2c3\u4f4d\u8bbe\u7f6e\u4e3a1\uff0c\u5373\uff1a <\/p>\n<\/p>\n

            \n
          1. \n

            0 0 0 0 1 0 0 0  <\/p>\n<\/li>\n

          2. \n

            #\u5bf9\u5e94redis\u64cd\u4f5c\u5373\uff1a  <\/p>\n<\/li>\n

          3. \n

            setbit key 3 1 <\/p>\n<\/li>\n<\/ol>\n

            \u5728\u6b64\u57fa\u7840\u4e0a\uff0c\u5982\u679c\u8981\u5728\u504f\u79fb\u91cf\u4e3a13\u7684\u4f4d\u7f6e\u8bbe\u7f6e1\uff0c\u5373\uff1a <\/p>\n<\/p>\n

              \n
            1. \n

              setbit key 13 1  <\/p>\n<\/li>\n

            2. \n

              #\u5bf9\u5e94redis\u4e2d\u7684\u5b58\u50a8\u4e3a\uff1a  <\/p>\n<\/li>\n

            3. \n

              0 0 1 0 | 0 0 0 0 | 0 0 0 0 | 1 0 0 0 <\/p>\n<\/li>\n<\/ol>\n

              \u65f6\u95f4\u590d\u6742\u5ea6
              <\/strong><\/p>\n

              GETBIT\u547d\u4ee4\u65f6\u95f4\u590d\u6742\u5ea6O(1)
              <\/strong><\/p>\n

              STEBIT\u547d\u4ee4\u65f6\u95f4\u590d\u6742\u5ea6O(1)
              <\/strong><\/p>\n

              BITCOUNT\u547d\u4ee4\u65f6\u95f4\u590d\u6742\u5ea6O(n)
              <\/strong><\/p>\n

              BITOP\u547d\u4ee4\u65f6\u95f4\u590d\u6742\u5ea6O(n)\u3001O(n2)<\/strong><\/p>\n

              \u6211\u4eec\u6765\u770bGETBIT\u4ee5\u53caSETBIT\u547d\u4ee4\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a\u4ec0\u4e48\u662fO(1)\uff0c\u5f53\u6211\u4eec\u6267\u884c\u4e00\u4e2aSETBIT key 10086 1\u7684\u503c\u7684\u65f6\u5019\uff0creids\u7684\u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n

              \u83b7\u53d6\u5230\u8981\u5199\u5165\u4f4d\u6570\u7ec4\u4e2d\u7684\u54ea\u4e2a\u5b57\u8282\uff1a10086\u00f78=1260\uff0c\u9700\u8981\u5199\u5165\u5230\u4f4d\u6570\u7ec4\u7684\u4e0b\u68071260\u7684\u5b57\u8282<\/p>\n

              \u83b7\u53d6\u8981\u5199\u5165\u5230\u8fd9\u4e2a\u5b57\u8282\u7684\u7b2c\u51e0\u4f4d\uff1a10086 mod 8 = 6\uff0c\u9700\u8981\u5199\u5165\u5230\u8fd9\u4e2a\u5b57\u8282\u7684\u4e0b\u6807\u4e3a6\u5373\u7b2c7\u4f4d\u4e0a\u53bb\u3002<\/p>\n

              \u901a\u8fc7\u8fd9\u4e24\u79cd\u8ba1\u7b97\u65b9\u5f0f\u5927\u5bb6\u53ef\u4ee5\u6e05\u6670\u7684\u770b\u5230\uff0c\u4f4d\u64cd\u4f5c\u7684GETBIT\u548cSETBIT\u90fd\u662f\u5e38\u91cf\u8ba1\u7b97\uff0c\u56e0\u6b64\u5b83\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002<\/p>\n

              \u800cBITCOUNT\u547d\u4ee4\u9700\u8981\u5bf9\u6574\u4e2a\u4f4d\u6570\u7ec4\u7684\u6240\u6709\u5143\u7d20\u8fdb\u884c\u904d\u5386\u7b97\u51fa\u503c\u4e3a1\u7684\u6709\u591a\u5c11\u4e2a\uff0c\u5f53\u7136redis\u5bf9\u4e8e\u5927\u6570\u636e\u4e86\u7684bit\u6267\u884cbitcount\u547d\u4ee4\u4f1a\u6709\u4e00\u6574\u5957\u590d\u6742\u7684\u4f18\u5316\u7684\u7b97\u6cd5\uff0c\u4f46\u662f\u6838\u5fc3\u601d\u8def\u8fd8\u662f\u8fd9\u4e2a\u610f\u601d\uff0c\u65e0\u975e\u662f\u51cf\u5c11\u90e8\u5206\u904d\u5386\u67e5\u8be2\u6b21\u6570\u3002\u6bd4\u5982\u4ee5128\u4f4d\u4e3a\u4e00\u6b21\u904d\u5386\uff0c\u90a3\u4e48\u4ed6\u7684\u904d\u5386\u6b21\u6570\u5c31\u662f\u6240\u6709\u7684\u4f4d\u6570\u9664\u4ee5128\u3002<\/p>\n

              BITTOP\u547d\u4ee4\u5219\u662f\u6839\u636e\u4e0d\u540c\u7684\u64cd\u4f5c\u6709\u4e0d\u540c\u7684\u6267\u884c\u65b9\u5f0f\u3002\u6bd4\u5982AND\u64cd\u4f5c\uff0c\u5219\u9700\u8981\u67e5\u770b\u4f4d\u503c\u4e3a1\u7684\u5373\u53ef\u3002<\/p>\n

              \u5b58\u50a8\u7a7a\u95f4\u8ba1\u7b97<\/strong><\/p>\n

              \u6839\u636e\u4e0a\u9762\u7684\u4ecb\u7ecd\uff0c\u76f8\u4fe1\u5927\u5bb6\u5df2\u7ecf\u77e5\u9053\u4e86\u57fa\u4e8eredis\u7684\u4f4d\u6570\u7ec4\u6570\u636e\u7ed3\u6784\u5b58\u50a8\u7684\u6570\u636e\u5360\u7528\u5185\u5b58\u5927\u5c0f\u662f\u600e\u4e48\u8ba1\u7b97\u7684\u4e86\u3002\u6bd4\u5982\u6709100\u4ebf\u7684\u6570\u636e\uff0c\u90a3\u4e48\u5b83\u9700\u8981\u7684\u5b57\u8282\u6570\u7ec4\uff1a<\/p>\n

              1000000000\u00f78\u00f71024\u00f71024\u2248119.21MB<\/p>\n

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              \u5e94\u7528\u573a\u666f<\/strong><\/p>\n

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              \u7528\u6237\u7b7e\u5230\u573a\u666f<\/strong><\/p>\n

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              \u6d3b\u8dc3\u7528\u6237\u6570\u7edf\u8ba1<\/strong><\/p>\n

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