{"id":476151,"date":"2023-08-09T07:26:52","date_gmt":"2023-08-09T07:26:52","guid":{"rendered":""},"modified":"2023-09-05T11:12:09","modified_gmt":"2023-09-05T11:12:09","slug":"cache-coherence","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/cn\/wiki\/cache-coherence\/","title":{"rendered":"\u7f13\u5b58\u4e00\u81f4\u6027"},"content":{"rendered":"

\u4ecb\u7ecd<\/h2>\n

\u7f13\u5b58\u4e00\u81f4\u6027\u662f\u8ba1\u7b97\u673a\u79d1\u5b66\u4e2d\u7684\u4e00\u4e2a\u57fa\u672c\u6982\u5ff5\uff0c\u5c24\u5176\u662f\u5728\u5e76\u884c\u548c\u5206\u5e03\u5f0f\u7cfb\u7edf\u9886\u57df\u3002\u5b83\u6307\u7684\u662f\u5b58\u50a8\u5728\u591a\u4e2a\u7f13\u5b58\u4e2d\u7684\u6570\u636e\u7684\u540c\u6b65\u548c\u4e00\u81f4\u6027\uff0c\u8fd9\u4e9b\u7f13\u5b58\u662f\u540c\u4e00\u5185\u5b58\u4f4d\u7f6e\u7684\u526f\u672c\u3002\u968f\u7740\u5904\u7406\u5668\u548c\u7cfb\u7edf\u53d8\u5f97\u8d8a\u6765\u8d8a\u590d\u6742\uff0c\u5bf9\u9ad8\u6548\u548c\u4e00\u81f4\u7684\u6570\u636e\u5171\u4eab\u7684\u9700\u6c42\u53d8\u5f97\u81f3\u5173\u91cd\u8981\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u7f13\u5b58\u4e00\u81f4\u6027\u7684\u5386\u53f2\u3001\u5185\u90e8\u7ed3\u6784\u3001\u7c7b\u578b\u3001\u7528\u4f8b\u548c\u672a\u6765\u524d\u666f\uff0c\u91cd\u70b9\u5173\u6ce8\u5176\u4e0e OneProxy \u7b49\u4ee3\u7406\u670d\u52a1\u5668\u63d0\u4f9b\u5546\u7684\u76f8\u5173\u6027\u3002<\/p>\n

\u5386\u53f2\u548c\u8d77\u6e90<\/h2>\n

\u7f13\u5b58\u4e00\u81f4\u6027\u7684\u6982\u5ff5\u53ef\u4ee5\u8ffd\u6eaf\u5230\u8ba1\u7b97\u673a\u67b6\u6784\u7684\u65e9\u671f\uff0c\u7279\u522b\u662f 20 \u4e16\u7eaa 60 \u5e74\u4ee3\u548c 70 \u5e74\u4ee3\u3002\u7814\u7a76\u4eba\u5458\u548c\u5de5\u7a0b\u5e08\u9762\u4e34\u7740\u9ad8\u6548\u5229\u7528\u7f13\u5b58\u6765\u63d0\u9ad8\u5904\u7406\u5668\u6027\u80fd\u7684\u6311\u6218\u3002\u968f\u7740\u7cfb\u7edf\u53d1\u5c55\u5230\u5305\u542b\u591a\u4e2a\u5904\u7406\u5668\uff0c\u9700\u8981\u5728\u4e0d\u540c\u7f13\u5b58\u4e4b\u95f4\u4fdd\u6301\u6570\u636e\u4e00\u81f4\u6027\uff0c\u4ece\u800c\u5bfc\u81f4\u4e86\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae\u7684\u53d1\u5c55\u3002<\/p>\n

\u9996\u6b21\u63d0\u53ca\u7f13\u5b58\u4e00\u81f4\u6027\u662f\u5728 1970 \u5e74 Robert B. Patch \u7684\u4e00\u7bc7\u8bba\u6587\u300aBurroughs B6700 \u7684\u67b6\u6784\u7279\u70b9\u300b\u4e2d\u3002\u8be5\u8bba\u6587\u5f15\u5165\u4e86\u786c\u4ef6\u5f3a\u5236\u7f13\u5b58\u4e00\u81f4\u6027\u7684\u6982\u5ff5\uff0c\u4ee5\u786e\u4fdd\u5171\u4eab\u5185\u5b58\u591a\u5904\u7406\u5668\u7cfb\u7edf\u4e2d\u591a\u4e2a\u7f13\u5b58\u4e4b\u95f4\u7684\u4e00\u81f4\u6027\u3002<\/p>\n

\u6709\u5173\u7f13\u5b58\u4e00\u81f4\u6027\u7684\u8be6\u7ec6\u4fe1\u606f<\/h2>\n

\u5728\u591a\u4e2a\u5904\u7406\u5668\u6216\u6838\u5fc3\u5171\u4eab\u5bf9\u516c\u5171\u5185\u5b58\u7684\u8bbf\u95ee\u7684\u7cfb\u7edf\u4e2d\uff0c\u7f13\u5b58\u4e00\u81f4\u6027\u81f3\u5173\u91cd\u8981\u3002\u5982\u679c\u6ca1\u6709\u7f13\u5b58\u4e00\u81f4\u6027\uff0c\u4e0d\u540c\u7684\u5904\u7406\u5668\u5bf9\u5171\u4eab\u6570\u636e\u7684\u89c6\u56fe\u53ef\u80fd\u4f1a\u4e0d\u4e00\u81f4\uff0c\u4ece\u800c\u5bfc\u81f4\u6570\u636e\u635f\u574f\u3001\u9519\u8bef\u548c\u4e0d\u53ef\u9884\u6d4b\u7684\u884c\u4e3a\u3002\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae\u901a\u8fc7\u7ef4\u62a4\u4ee5\u4e0b\u539f\u5219\u6765\u89e3\u51b3\u6b64\u95ee\u9898\uff1a<\/p>\n

    \n
  1. \n

    \u8bfb\u53d6\u4f20\u64ad<\/strong>\uff1a\u786e\u4fdd\u8bfb\u53d6\u5171\u4eab\u5185\u5b58\u4f4d\u7f6e\u7684\u4efb\u4f55\u5904\u7406\u5668\u59cb\u7ec8\u83b7\u5f97\u6700\u65b0\u7684\u503c\u3002<\/p>\n<\/li>\n

  2. \n

    \u5199\u5165\u4f20\u64ad<\/strong>\uff1a\u5f53\u5904\u7406\u5668\u5199\u5165\u5171\u4eab\u5185\u5b58\u4f4d\u7f6e\u65f6\uff0c\u66f4\u65b0\u7684\u503c\u4f1a\u7acb\u5373\u88ab\u6240\u6709\u5176\u4ed6\u5904\u7406\u5668\u770b\u5230\u3002<\/p>\n<\/li>\n

  3. \n

    \u65e0\u6548<\/strong>\uff1a\u5982\u679c\u4e00\u4e2a\u5904\u7406\u5668\u4fee\u6539\u4e86\u67d0\u4e2a\u5185\u5b58\u4f4d\u7f6e\uff0c\u5219\u5176\u4ed6\u7f13\u5b58\u4e2d\u8be5\u4f4d\u7f6e\u7684\u6240\u6709\u5176\u4ed6\u526f\u672c\u90fd\u5c06\u5931\u6548\u6216\u66f4\u65b0\u4ee5\u53cd\u6620\u8be5\u66f4\u6539\u3002<\/p>\n<\/li>\n<\/ol>\n

    \u5185\u90e8\u7ed3\u6784\u53ca\u5de5\u4f5c\u673a\u5236<\/h2>\n

    \u7f13\u5b58\u4e00\u81f4\u6027\u901a\u5e38\u901a\u8fc7\u5404\u79cd\u534f\u8bae\u5b9e\u73b0\uff0c\u4f8b\u5982 MESI\uff08\u4fee\u6539\u3001\u72ec\u5360\u3001\u5171\u4eab\u3001\u65e0\u6548\uff09\u534f\u8bae\u6216 MOESI\uff08\u4fee\u6539\u3001\u6240\u6709\u8005\u3001\u72ec\u5360\u3001\u5171\u4eab\u3001\u65e0\u6548\uff09\u534f\u8bae\u3002\u8fd9\u4e9b\u534f\u8bae\u4f9d\u8d56\u4e8e\u7f13\u5b58\u72b6\u6001\u548c\u7f13\u5b58\u95f4\u901a\u4fe1\u673a\u5236\u6765\u786e\u4fdd\u4e00\u81f4\u6027\u3002<\/p>\n

    \u5f53\u5904\u7406\u5668\u8bfb\u53d6\u6216\u5199\u5165\u5185\u5b58\u4f4d\u7f6e\u65f6\uff0c\u5b83\u4f1a\u68c0\u67e5\u8be5\u4f4d\u7f6e\u7684\u7f13\u5b58\u72b6\u6001\u3002\u7f13\u5b58\u72b6\u6001\u6307\u793a\u6570\u636e\u662f\u6709\u6548\u7684\u3001\u5df2\u4fee\u6539\u7684\u3001\u5171\u4eab\u7684\u8fd8\u662f\u72ec\u5360\u7684\u3002\u6839\u636e\u7f13\u5b58\u72b6\u6001\uff0c\u5904\u7406\u5668\u53ef\u4ee5\u51b3\u5b9a\u662f\u4ece\u5176\u4ed6\u7f13\u5b58\u4e2d\u83b7\u53d6\u6570\u636e\u3001\u66f4\u65b0\u81ea\u5df1\u7684\u7f13\u5b58\u8fd8\u662f\u5411\u5176\u4ed6\u7f13\u5b58\u5e7f\u64ad\u66f4\u65b0\u3002<\/p>\n

    \u7f13\u5b58\u4e00\u81f4\u6027\u7684\u4e3b\u8981\u7279\u6027<\/h2>\n

    \u7f13\u5b58\u4e00\u81f4\u6027\u63d0\u4f9b\u4e86\u51e0\u4e2a\u6709\u52a9\u4e8e\u5e76\u884c\u7cfb\u7edf\u7a33\u5b9a\u6027\u548c\u6548\u7387\u7684\u57fa\u672c\u7279\u6027\uff1a<\/p>\n

      \n
    1. \n

      \u4e00\u81f4\u6027<\/strong>\uff1a\u7f13\u5b58\u4e00\u81f4\u6027\u4fdd\u8bc1\u6240\u6709\u5904\u7406\u5668\u5728\u4efb\u610f\u7ed9\u5b9a\u65f6\u95f4\u770b\u5230\u5171\u4eab\u5185\u5b58\u4f4d\u7f6e\u7684\u76f8\u540c\u503c\u3002<\/p>\n<\/li>\n

    2. \n

      \u6b63\u786e\u6027<\/strong>\uff1a\u786e\u4fdd\u5185\u5b58\u64cd\u4f5c\u6309\u7167\u6b63\u786e\u7684\u987a\u5e8f\u6267\u884c\u5e76\u4e14\u4e0d\u8fdd\u53cd\u56e0\u679c\u5173\u7cfb\u3002<\/p>\n<\/li>\n

    3. \n

      \u8868\u73b0<\/strong>\uff1a\u4e00\u81f4\u6027\u534f\u8bae\u65e8\u5728\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u7f13\u5b58\u65e0\u6548\u548c\u4e00\u81f4\u6027\u6d41\u91cf\uff0c\u4ece\u800c\u63d0\u9ad8\u6574\u4f53\u7cfb\u7edf\u6027\u80fd\u3002<\/p>\n<\/li>\n<\/ol>\n

      \u7f13\u5b58\u4e00\u81f4\u6027\u7684\u7c7b\u578b<\/h2>\n

      \u6709\u51e0\u79cd\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae\uff0c\u6bcf\u79cd\u534f\u8bae\u90fd\u6709\u81ea\u5df1\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u534f\u8bae\u7684\u5217\u8868\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n
      \u534f\u8bae<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
      \u6885\u897f<\/td>\n\u6700\u5e38\u89c1\u7684\u534f\u8bae\u4e4b\u4e00\uff0c\u4f7f\u7528\u56db\u79cd\u72b6\u6001\uff08\u4fee\u6539\u3001\u6392\u4ed6\u3001\u5171\u4eab\u3001\u65e0\u6548\uff09\u3002<\/td>\n<\/tr>\n
      \u83ab\u4f0a\u897f<\/td>\nMESI \u7684\u6269\u5c55\uff0c\u6dfb\u52a0\u4e86\u201c\u6240\u6709\u8005\u201d\u72b6\u6001\u6765\u5904\u7406\u5177\u6709\u8bfb\u53d6\u72ec\u5360\u6027\u7684\u591a\u4e2a\u7f13\u5b58\u3002<\/td>\n<\/tr>\n
      \u5fae\u661f<\/td>\n\u4f7f\u7528\u4e09\u79cd\u72b6\u6001\uff08\u4fee\u6539\u3001\u5171\u4eab\u3001\u65e0\u6548\uff09\u5e76\u4e14\u7f3a\u5c11\u201c\u72ec\u5360\u201d\u72b6\u6001\u3002<\/td>\n<\/tr>\n
      \u6885\u897f\u5f17<\/td>\nMESI \u7684\u589e\u5f3a\u7248\u672c\uff0c\u901a\u8fc7\u6dfb\u52a0 Forward \u72b6\u6001\u6765\u51cf\u5c11\u65e0\u6548\u5316\u3002<\/td>\n<\/tr>\n
      \u9f99\u534f\u8bae<\/td>\n\u5f15\u5165\u201c\u8f6c\u53d1\u201d\u72b6\u6001\u4ee5\u51cf\u5c11\u5199\u5165\u4f20\u64ad\u6d41\u91cf\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u7528\u4f8b\u548c\u6311\u6218<\/h2>\n

      \u7f13\u5b58\u4e00\u81f4\u6027\u5728\u5404\u79cd\u573a\u666f\u4e2d\u90fd\u81f3\u5173\u91cd\u8981\uff0c\u5176\u4e2d\u5305\u62ec\uff1a<\/p>\n

        \n
      1. \n

        \u591a\u5904\u7406\u5668\u7cfb\u7edf<\/strong>\uff1a\u5728\u591a\u6838 CPU \u548c\u591a\u5904\u7406\u5668\u7cfb\u7edf\u4e2d\uff0c\u7f13\u5b58\u4e00\u81f4\u6027\u53ef\u786e\u4fdd\u6838\u5fc3\u4e4b\u95f4\u6b63\u786e\u7684\u6570\u636e\u5171\u4eab\u3002<\/p>\n<\/li>\n

      2. \n

        \u5206\u5e03\u5f0f\u7cfb\u7edf<\/strong>\uff1a\u7f13\u5b58\u4e00\u81f4\u6027\u5bf9\u4e8e\u7ef4\u62a4\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u548c\u6587\u4ef6\u7cfb\u7edf\u7684\u4e00\u81f4\u6027\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/li>\n<\/ol>\n

        \u4e0e\u7f13\u5b58\u4e00\u81f4\u6027\u76f8\u5173\u7684\u6311\u6218\u5305\u62ec\uff1a<\/p>\n

          \n
        1. \n

          \u4e00\u81f4\u6027\u5f00\u9500<\/strong>\uff1a\u4fdd\u6301\u4e00\u81f4\u6027\u9700\u8981\u989d\u5916\u7684\u6c9f\u901a\u548c\u5f00\u9500\uff0c\u4ece\u800c\u5f71\u54cd\u6027\u80fd\u3002<\/p>\n<\/li>\n

        2. \n

          \u53ef\u6269\u5c55\u6027<\/strong>\uff1a\u968f\u7740\u5904\u7406\u5668\u6570\u91cf\u7684\u589e\u52a0\uff0c\u786e\u4fdd\u7f13\u5b58\u4e00\u81f4\u6027\u53d8\u5f97\u66f4\u5177\u6311\u6218\u6027\u3002<\/p>\n<\/li>\n<\/ol>\n

          \u4e3a\u4e86\u514b\u670d\u8fd9\u4e9b\u6311\u6218\uff0c\u7814\u7a76\u4eba\u5458\u548c\u5de5\u7a0b\u5e08\u4e0d\u65ad\u5f00\u53d1\u65b0\u7684\u4e00\u81f4\u6027\u534f\u8bae\u548c\u4f18\u5316\u3002<\/p>\n

          \u4e3b\u8981\u7279\u70b9\u53ca\u6bd4\u8f83<\/h2>\n\n\n\n\n\n\n\n
          \u5b66\u671f<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
          \u7f13\u5b58\u4e00\u81f4\u6027<\/td>\n\u786e\u4fdd\u8bbf\u95ee\u540c\u4e00\u5185\u5b58\u4f4d\u7f6e\u7684\u591a\u4e2a\u7f13\u5b58\u4e2d\u7684\u6570\u636e\u540c\u6b65\u3002<\/td>\n<\/tr>\n
          \u5185\u5b58\u4e00\u81f4\u6027<\/td>\n\u5b9a\u4e49\u591a\u5904\u7406\u5668\u7cfb\u7edf\u4e2d\u4e0d\u540c\u5904\u7406\u5668\u6240\u770b\u5230\u7684\u5185\u5b58\u64cd\u4f5c\u987a\u5e8f\u3002<\/td>\n<\/tr>\n
          \u7f13\u5b58\u5931\u6548<\/td>\n\u5f53\u53e6\u4e00\u4e2a\u5904\u7406\u5668\u4fee\u6539\u540c\u4e00\u4f4d\u7f6e\u65f6\u5c06\u7f13\u5b58\u6570\u636e\u6807\u8bb0\u4e3a\u65e0\u6548\u7684\u8fc7\u7a0b\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          \u524d\u666f\u548c\u672a\u6765\u6280\u672f<\/h2>\n

          \u7f13\u5b58\u4e00\u81f4\u6027\u4ecd\u7136\u662f\u4e00\u4e2a\u6b63\u5728\u8fdb\u884c\u7684\u7814\u7a76\u8bfe\u9898\u3002\u672a\u6765\u7684\u6280\u672f\u53ef\u80fd\u4fa7\u91cd\u4e8e\uff1a<\/p>\n

            \n
          1. \n

            \u9ad8\u7ea7\u4e00\u81f4\u6027\u534f\u8bae<\/strong>\uff1a\u4e3a\u65b0\u5174\u67b6\u6784\u5f00\u53d1\u66f4\u9ad8\u6548\u3001\u53ef\u6269\u5c55\u7684\u4e00\u81f4\u6027\u534f\u8bae\u3002<\/p>\n<\/li>\n

          2. \n

            \u975e\u7edf\u4e00\u5185\u5b58\u8bbf\u95ee (NUMA)<\/strong>\uff1a\u89e3\u51b3 NUMA \u67b6\u6784\u4e2d\u7684\u4e00\u81f4\u6027\u6311\u6218\u4ee5\u4f18\u5316\u6570\u636e\u8bbf\u95ee\u3002<\/p>\n<\/li>\n<\/ol>\n

            \u7f13\u5b58\u4e00\u81f4\u6027\u548c\u4ee3\u7406\u670d\u52a1\u5668<\/h2>\n

            \u4ee3\u7406\u670d\u52a1\u5668\uff08\u5982 OneProxy\uff09\u5728\u7ba1\u7406\u7f51\u7edc\u6d41\u91cf\u548c\u4f18\u5316\u8d44\u6e90\u5229\u7528\u7387\u65b9\u9762\u53d1\u6325\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002\u5728\u591a\u4e2a\u8282\u70b9\u540c\u65f6\u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u4ee3\u7406\u670d\u52a1\u5668\u96c6\u7fa4\u4e2d\uff0c\u7f13\u5b58\u4e00\u81f4\u6027\u975e\u5e38\u6709\u7528\u3002\u901a\u8fc7\u5728\u6574\u4e2a\u96c6\u7fa4\u4e2d\u7ef4\u62a4\u4e00\u81f4\u7684\u7f13\u5b58\u6570\u636e\uff0c\u4ee3\u7406\u670d\u52a1\u5668\u53ef\u4ee5\u5411\u5ba2\u6237\u7aef\u63d0\u4f9b\u4e00\u81f4\u7684\u54cd\u5e94\uff0c\u5e76\u51cf\u5c11\u4ece\u5916\u90e8\u6e90\u68c0\u7d22\u5197\u4f59\u6570\u636e\u3002<\/p>\n

            \u6b64\u5916\uff0c\u7f13\u5b58\u4e00\u81f4\u6027\u53ef\u4ee5\u5e2e\u52a9\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u7f13\u5b58\u672a\u547d\u4e2d\u5e76\u63d0\u9ad8\u4ee3\u7406\u670d\u52a1\u5668\u7684\u6574\u4f53\u6027\u80fd\uff0c\u4ece\u800c\u7f29\u77ed\u5ba2\u6237\u7aef\u7684\u54cd\u5e94\u65f6\u95f4\u3002<\/p>\n

            \u76f8\u5173\u94fe\u63a5<\/h2>\n

            \u6709\u5173\u7f13\u5b58\u4e00\u81f4\u6027\u7684\u66f4\u591a\u6df1\u5165\u4fe1\u606f\uff0c\u53ef\u4ee5\u53c2\u8003\u4ee5\u4e0b\u8d44\u6e90\uff1a<\/p>\n

              \n
            1. \u65af\u5766\u798f\u5927\u5b66 CS240\uff1a\u7f13\u5b58\u4e00\u81f4\u6027<\/a><\/li>\n
            2. IEEE \u8ba1\u7b97\u673a\u534f\u4f1a\uff1a\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae<\/a><\/li>\n
            3. ACM \u6570\u5b57\u56fe\u4e66\u9986\uff1a\u53ef\u6269\u5c55\u7f13\u5b58\u4e00\u81f4\u6027<\/a><\/li>\n<\/ol>\n

              \u603b\u4e4b\uff0c\u7f13\u5b58\u4e00\u81f4\u6027\u662f\u73b0\u4ee3\u8ba1\u7b97\u7cfb\u7edf\u7684\u4e00\u4e2a\u5173\u952e\u65b9\u9762\uff0c\u53ef\u786e\u4fdd\u591a\u6838\u548c\u5206\u5e03\u5f0f\u73af\u5883\u4e2d\u7684\u6570\u636e\u4e00\u81f4\u6027\u548c\u6b63\u786e\u6027\u3002\u968f\u7740\u6280\u672f\u7684\u4e0d\u65ad\u8fdb\u6b65\uff0c\u5f00\u53d1\u9ad8\u6548\u7684\u4e00\u81f4\u6027\u534f\u8bae\u5c06\u5728\u5b9e\u73b0\u5e76\u884c\u8ba1\u7b97\u548c\u7f51\u7edc\u7cfb\u7edf\u7684\u66f4\u9ad8\u6027\u80fd\u548c\u53ef\u6269\u5c55\u6027\u65b9\u9762\u53d1\u6325\u91cd\u8981\u4f5c\u7528\u3002\u4ee3\u7406\u670d\u52a1\u5668\u63d0\u4f9b\u5546\uff08\u4f8b\u5982 OneProxy\uff09\u53ef\u4ee5\u5229\u7528\u7f13\u5b58\u4e00\u81f4\u6027\u6765\u4f18\u5316\u5176\u670d\u52a1\u5e76\u4e3a\u5ba2\u6237\u63d0\u4f9b\u66f4\u597d\u7684\u4f53\u9a8c\u3002<\/p>","protected":false},"featured_media":476152,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476151","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about Cache Coherence: Ensuring Synchronized Data in a Distributed World<\/mark>","faq_items":[{"question":"What is cache coherence?","answer":"

              Cache coherence is a fundamental concept in computer science that ensures synchronized data across multiple caches accessing the same memory location. It guarantees that all processors see the most up-to-date value for shared data, preventing inconsistencies and data corruption.<\/p>"},{"question":"Why is cache coherence important?","answer":"

              Cache coherence is crucial in parallel and distributed systems where multiple processors or cores share access to a common memory. Without cache coherence, different processors may have inconsistent views of the shared data, leading to bugs and unpredictable behavior. Cache coherence protocols maintain data consistency, correctness, and performance in such systems.<\/p>"},{"question":"How does cache coherence work?","answer":"

              Cache coherence is implemented through various protocols like MESI and MOESI. These protocols use cache states and inter-cache communication mechanisms to ensure proper synchronization. When a processor reads or writes a memory location, it checks the cache state to determine whether to fetch data from other caches, update its own cache, or broadcast updates to others.<\/p>"},{"question":"What are the key features of cache coherence?","answer":"

              Cache coherence offers several essential features, including consistency (ensuring all processors see the same value), correctness (maintaining the correct order of memory operations), and performance optimization by minimizing cache invalidations and coherence traffic.<\/p>"},{"question":"What types of cache coherence exist?","answer":"

              There are several cache coherence protocols, such as MESI, MOESI, MSI, MESIF, and the Dragon Protocol. Each protocol has its advantages and disadvantages, catering to different system architectures and requirements.<\/p>"},{"question":"In what scenarios is cache coherence used?","answer":"

              Cache coherence is used in multiprocessor systems (multi-core CPUs) and distributed systems (databases and file systems). It ensures proper data sharing among cores and maintains consistency across distributed resources.<\/p>"},{"question":"What challenges are associated with cache coherence?","answer":"

              Cache coherence introduces additional communication overhead and can pose scalability challenges as the number of processors increases. Researchers and engineers continuously develop new coherence protocols and optimizations to address these challenges.<\/p>"},{"question":"How does cache coherence relate to proxy servers like OneProxy?","answer":"

              Proxy servers, like OneProxy, can benefit from cache coherence in cluster environments. By maintaining coherent cache data across nodes, proxy servers provide consistent responses to clients and optimize data retrieval from external sources, leading to improved performance and faster response times.<\/p>"},{"question":"What does the future hold for cache coherence?","answer":"

              Cache coherence remains an active area of research, and future technologies may focus on advanced coherence protocols for emerging architectures and addressing coherence challenges in non-uniform memory access (NUMA) systems.<\/p>"},{"question":"Where can I find more information about cache coherence?","answer":"

              For more in-depth information about cache coherence, you can refer to the following resources:<\/p>

              1. Stanford University CS240: Cache Coherence<\/a><\/li>
              2. IEEE Computer Society: Cache Coherence Protocols<\/a><\/li>
              3. ACM Digital Library: Scalable Cache Coherence<\/a><\/li><\/ol>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki\/476151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki\/476151\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/media\/476152"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/media?parent=476151"}],"curies":[{"name":"\u53ef\u6e7f\u6027\u7c89\u5242","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}