{"id":80,"date":"2026-09-01T01:23:33","date_gmt":"2026-08-31T17:23:33","guid":{"rendered":"https:\/\/www.ziliaochi.cn\/index.php\/2026\/09\/01\/cpu-cache-line-false-sharing\/"},"modified":"2026-09-02T00:40:50","modified_gmt":"2026-09-01T16:40:50","slug":"cpu-cache-line-false-sharing","status":"publish","type":"post","link":"https:\/\/www.ziliaochi.cn\/index.php\/2026\/09\/01\/cpu-cache-line-false-sharing\/","title":{"rendered":"\u4ece CPU \u7f13\u5b58\u884c\u5230\u4f2a\u5171\u4eab\uff1a\u5e76\u53d1\u7f16\u7a0b\u91cc\u6700\u88ab\u4f4e\u4f30\u7684\u6027\u80fd\u6740\u624b"},"content":{"rendered":"
\n
\u5173\u952e\u8bcd<\/span>\u4f2a\u5171\u4eab\u3001\u7f13\u5b58\u884c\u3001False Sharing\u3001MESI\u3001\u5e76\u53d1\u7f16\u7a0b\u3001\u6027\u80fd\u4f18\u5316<\/div>\n
\n
\u76ee\u5f55<\/div>\n
    \n
  1. \u4e00\u3001\u5148\u5efa\u7acb\u7f13\u5b58\u884c\u7684\u57fa\u672c\u8ba4\u77e5<\/a><\/li>\n
  2. \u4e8c\u3001\u4f2a\u5171\u4eab\u662f\u600e\u4e48\u53d1\u751f\u7684<\/a><\/li>\n
  3. \u4e09\u3001\u600e\u4e48\u5224\u65ad\u81ea\u5df1\u8e29\u4e86\u8fd9\u4e2a\u5751<\/a><\/li>\n
  4. \u56db\u3001\u4e09\u79cd\u89e3\u6cd5<\/a><\/li>\n
  5. \u4e94\u3001\u5b9e\u8df5\u4e2d\u7684\u53d6\u820d<\/a><\/li>\n
  6. \u516d\u3001\u9762\u8bd5\u600e\u4e48\u7b54<\/a><\/li>\n
  7. \u4e03\u3001\u5c0f\u7ed3<\/a><\/li>\n<\/ol>\n<\/div>\n

    \u6709\u4e00\u6bb5\u4ee3\u7801\uff0c\u5355\u7ebf\u7a0b\u8dd1\u5f97\u98de\u5feb\uff0c\u4e00\u4e0a\u591a\u7ebf\u7a0b\u5c31\u6162\u5f97\u79bb\u8c31\uff0c\u800c\u4e14\u52a0\u7684\u7ebf\u7a0b\u8d8a\u591a\u8d8a\u6162\u3002\u6392\u67e5\u534a\u5929\u53d1\u73b0\uff1aCPU \u6ca1\u8dd1\u6ee1\u3001\u9501\u7ade\u4e89\u4e5f\u4e0d\u4e25\u91cd\u3001\u4e1a\u52a1\u903b\u8f91\u6beb\u65e0\u95ee\u9898\u3002<\/p>\n

    \u5143\u51f6\u5f80\u5f80\u85cf\u5728\u4f60\u6839\u672c\u6ca1\u770b\u8fc7\u7684\u5730\u65b9\u2014\u2014CPU \u7f13\u5b58\u884c\u4e0e\u4f2a\u5171\u4eab\uff08False Sharing\uff09<\/strong>\u3002\u8fd9\u662f\u5e76\u53d1\u7f16\u7a0b\u4e2d\u6700\u88ab\u4f4e\u4f30\u3001\u4e5f\u6700\u5bb9\u6613\u88ab\u8bef\u8bca\u7684\u6027\u80fd\u6740\u624b\u3002<\/p>\n

    \u4e00\u3001\u5148\u5efa\u7acb\u7f13\u5b58\u884c\u7684\u57fa\u672c\u8ba4\u77e5<\/h2>\n

    CPU \u8bbf\u95ee\u5185\u5b58\u7684\u901f\u5ea6\u6bd4\u8bbf\u95ee\u7f13\u5b58\u6162\u4e00\u5230\u4e24\u4e2a\u6570\u91cf\u7ea7\u3002\u4e3a\u4e86\u644a\u8584\u8fd9\u4e2a\u5dee\u8ddd\uff0cCPU \u4e0d\u662f\u6309\u5b57\u8282\u8bfb\u5185\u5b58\uff0c\u800c\u662f\u6309”\u7f13\u5b58\u884c”\uff08Cache Line\uff0c\u4e3b\u6d41\u67b6\u6784\u4e3a 64 \u5b57\u8282\uff09\u4e3a\u5355\u4f4d\u6574\u5757\u52a0\u8f7d<\/strong>\u3002<\/p>\n

    \"\u540c\u4e00\u7f13\u5b58\u884c\u91cc\u7684\u4e24\u4e2a\u65e0\u5173\u53d8\u91cf\"
    \u4f2a\u5171\u4eab\u793a\u610f\uff1a\u53d8\u91cf a \u4e0e b \u540c\u5904\u4e00\u4e2a 64 \u5b57\u8282\u7f13\u5b58\u884c\uff0c\u4e24\u4e2a\u6838\u5fc3\u53cd\u590d\u4e92\u76f8\u4f7f\u7f13\u5b58\u5931\u6548<\/figcaption><\/figure>\n

    \u5173\u952e\u63a8\u8bba\uff1a\u5373\u4f7f\u4f60\u53ea\u6539\u4e00\u4e2a 8 \u5b57\u8282\u7684 long\uff0cCPU \u4e5f\u4f1a\u628a\u5305\u542b\u5b83\u7684\u6574\u4e2a 64 \u5b57\u8282\u7f13\u5b58\u884c\u52a0\u8f7d\u8fdb\u6765<\/strong>\u3002\u5728\u591a\u6838\u73af\u5883\u4e0b\uff0c\u8fd9\u5e26\u6765\u4e86\u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae\u7684\u5f00\u9500\u3002<\/p>\n

    \u4e8c\u3001\u4f2a\u5171\u4eab\u662f\u600e\u4e48\u53d1\u751f\u7684<\/h2>\n

    \u5047\u8bbe\u6709\u4e24\u4e2a\u53d8\u91cf a<\/code> \u548c b<\/code>\uff0c\u5b83\u4eec\u5728\u5185\u5b58\u4e2d\u6070\u597d\u76f8\u90bb\uff0c\u843d\u5728\u540c\u4e00\u4e2a\u7f13\u5b58\u884c\u91cc<\/strong>\uff1a<\/p>\n

    class Counter {\n  volatile long a;  \/\/ \u7ebf\u7a0b 1 \u53cd\u590d\u5199\n  volatile long b;  \/\/ \u7ebf\u7a0b 2 \u53cd\u590d\u5199\n}\n<\/code><\/pre>\n
    \u4ece\u903b\u8f91\u4e0a\u770b\uff0c\u4e24\u4e2a\u7ebf\u7a0b\u5199\u7684\u662f\u5b8c\u5168\u4e0d\u540c\u7684\u53d8\u91cf\uff0c\u6ca1\u6709\u4efb\u4f55\u6570\u636e\u7ade\u4e89<\/strong>\u3002\u4f46\u4ece CPU \u7684\u89d2\u5ea6\uff1a<\/p>\n
      \n
    1. \u7ebf\u7a0b 1 \u6539\u4e86 a<\/code>\uff0c\u5b83\u6240\u5728\u7684\u7f13\u5b58\u884c\u88ab\u6807\u8bb0\u4e3a\u810f\uff1b<\/li>\n
    2. \u7f13\u5b58\u4e00\u81f4\u6027\u534f\u8bae\uff08MESI\uff09\u4f1a\u8ba9\u5176\u4ed6\u6838\u5fc3\u4e0a\u540c\u4e00\u4e2a\u7f13\u5b58\u884c\u7684\u526f\u672c\u5168\u90e8\u5931\u6548<\/strong>\uff1b<\/li>\n
    3. \u7ebf\u7a0b 2 \u60f3\u5199 b<\/code>\uff0c\u53d1\u73b0\u7f13\u5b58\u884c\u5931\u6548\uff0c\u5fc5\u987b\u91cd\u65b0\u4ece\u5185\u5b58\u52a0\u8f7d\uff1b<\/li>\n
    4. \u7ebf\u7a0b 2 \u5199\u5b8c\uff0c\u53c8\u628a\u7ebf\u7a0b 1 \u7684\u526f\u672c\u641e\u5931\u6548\u2026\u2026<\/li>\n<\/ol>\n
      \u7ed3\u679c\u5c31\u662f\uff1a\u4e24\u4e2a\u6beb\u65e0\u5173\u8054\u7684\u53d8\u91cf\uff0c\u56e0\u4e3a\u4f4f\u5728\u540c\u4e00\u95f4”\u623f\u5b50”\u91cc\uff0c\u5bfc\u81f4\u4e24\u4e2a\u6838\u5fc3\u53cd\u590d\u4e92\u76f8\u4f7f\u7eca\u5b50\u3002<\/strong> \u8fd9\u5c31\u662f\u4f2a\u5171\u4eab\u2014\u2014\u6ca1\u6709\u771f\u6b63\u5171\u4eab\u6570\u636e\uff0c\u5374\u4ed8\u51fa\u4e86\u5171\u4eab\u7684\u4ee3\u4ef7\u3002<\/p>\n
      \u4e09\u3001\u600e\u4e48\u5224\u65ad\u81ea\u5df1\u8e29\u4e86\u8fd9\u4e2a\u5751<\/h2>\n
      \u4e09\u4e2a\u7279\u5f81\u540c\u65f6\u51fa\u73b0\u65f6\uff0c\u9ad8\u5ea6\u6000\u7591\u4f2a\u5171\u4eab\uff1a<\/p>\n