{"id":159292,"date":"2020-09-22T21:18:28","date_gmt":"2020-09-22T13:18:28","guid":{"rendered":"http:\/\/4563.org\/?p=159292"},"modified":"2020-09-22T21:18:28","modified_gmt":"2020-09-22T13:18:28","slug":"%e4%b8%80%e4%b8%aa%e5%bc%b1%e5%80%bc%e7%9a%84%e9%97%ae%e9%a2%98%ef%bc%8c%e8%af%bb%e7%9a%84%e6%88%90%e6%9c%ac%e6%af%94%e5%86%99%e4%bd%8e%e5%a4%9a%e5%b0%91%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=159292","title":{"rendered":"\u4e00\u4e2a\u5f31\u503c\u7684\u95ee\u9898\uff0c\u8bfb\u7684\u6210\u672c\u6bd4\u5199\u4f4e\u591a\u5c11\uff1f"},"content":{"rendered":"
\n
\n
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\u4e00\u4e2a\u5f31\u503c\u7684\u95ee\u9898\uff0c\u8bfb\u7684\u6210\u672c\u6bd4\u5199\u4f4e\u591a\u5c11\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : 786375312123 <\/span> <\/i> 0<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

RT \u4ee5\u524d\u4e0a\u5927\u5b66\u5b66\u8fc7\u6c47\u7f16\uff0c\u53ef\u662f\u597d\u4e45\u4e0d\u7528\u8bb0\u4e0d\u6e05\u695a\u4e86\u3002\u800c\u4e14\u90a3\u4e2a\u65f6\u5019\u4e5f\u6ca1\u8ba8\u8bba\u8fc7\u6210\u672c\u95ee\u9898\u3002<\/p>\n

\u6bd4\u5982\u8bf4\u5f88\u7b80\u5355\u7684 c++\u4ee3\u7801<\/p>\n

a > 0 \u548c a = 12<\/p>\n

\u524d\u4e00\u53e5\u7684\u6210\u672c\u80fd\u6bd4\u540e\u4e00\u53e5\u4f4e\u591a\u5c11\uff1f\u5e95\u5728\u54ea\u4e86\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (9<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : lcdtyph <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5355\u72ec\u62ce\u51fa\u6765\u4e24\u53e5\u6bd4\u8f83\u5bf9\u5e94\u6c47\u7f16\u7684\u6027\u80fd\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u8fd8\u8981\u8003\u8651\u524d\u540e\u6307\u4ee4\u5bf9\u6d41\u6c34\u7ebf\u3001\u7f13\u5b58\u7684\u5f71\u54cd <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : ryd994 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5efa\u8bae\u4f60\u4ee3\u7801\u6210\u5f62\u524d\u4e0d\u8981\u7ea0\u7ed3\u8fd9\u79cd\u7ec6\u679d\u672b\u8282\u7684\u4e8b
    \u4ee3\u7801\u6210\u5f62\u4ee5\u540e\uff0c\u4f60\u4f1a\u53d1\u73b0\u4f60\u7684\u7a0b\u5e8f\u6839\u672c\u6ca1\u5230\u8fd9\u4e2a\u7ea7\u522b
    \u5982\u679c\u4f60\u7684\u7a0b\u5e8f\u771f\u7684\u9700\u8981\u8fd9\u4e2a\u7ea7\u522b\u7684\u4f18\u5316\uff0c\u90a3\u4f60\u5e94\u8be5\u5df2\u7ecf\u638c\u63e1\u5404\u79cd profiling \u7684\u7528\u6cd5\uff0c\u95ee\u4e0d\u51fa\u8fd9\u4e2a\u95ee\u9898\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : 786375312123 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ryd994 \u6211\u5de5\u4f5c\u4e0d\u5c11\u5e74\u4e86\u3002\u5c31\u662f\u4eca\u5929\u7a81\u7136\u60f3\u8d77\u8fd9\u4e2a\u95ee\u9898\uff0c\u597d\u5947 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : 786375312123 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @lcdtyph \u8fd9\u4e2a\u53ea\u662f\u4e3e\u4f8b\u3002\u6211\u4e5f\u4e0d\u60f3\u6bd4\u8f83 mov \u548c\u8bfb\u8bed\u53e5\uff08\u5fd8\u8bb0\u54ea\u4e2a\u4e86\uff0c\u8bfb\u6709\u5bf9\u5e94\u7684\u6c47\u7f16\u4e48\uff1f\uff09\u6211\u5c31\u662f\u60f3\u77e5\u9053\u8bed\u4e49\u4e0a\u7684\u8bfb\u548c\u5199\uff0c\u54ea\u4e2a\u6210\u672c\u66f4\u9ad8\uff1f\u4f3c\u4e4e\u8bfb\u7684\u8bdd\uff0c\u4f60\u4e00\u5b9a\u62f7\u8d1d\u4e00\u4e2a\u4e1c\u897f\uff0c\u4e0d\u7ba1\u662f\u5730\u5740\u8fd8\u662f\u503c\u3002\u5199\u7684\u8bdd\uff0c\u4f3c\u4e4e\u9700\u8981\u83b7\u53d6\u5730\u5740\uff0c\u7136\u540e\u5199\u5230\u8fd9\u4e2a\u5730\u5740\uff1f
    \u8fd9\u4e48\u770b\u8bfb\u7684\u6210\u672c\u5927\u6982\u7387\u6bd4\u5199\u8981\u4f4e\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : cassyfar <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4eca\u5929\u6240\u8bf4\u7684\u201c\u5199\u201d\u6210\u672c\uff0c\u4e3b\u8981\u662f\u6307\u4e92\u8054\u7f51\u5e94\u7528\u4e0b\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u201c\u5199\u201d\uff0c\u91cc\u9762\u6d89\u53ca\u4e86 replica \u7684\u66f4\u65b0\uff0c\u591a\u4e2a\u5199\u5230\u540c\u4e00 entry \u7684 consistency\uff0ccache \u7684\u66f4\u65b0\uff0c\u9ad8 TPS \u4e0b\u5982\u4f55\u5904\u7406\u5199\uff0catomic \u7684\u5199\uff0c\u7b49\u7b49\u5427\u3002\u800c\u8bfb\uff0c\u57fa\u672c\u5c31\u662f\u4e00\u4e2a\u8bfb\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : vk42 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @786375312123 \u8bfb\u548c\u5199\u90fd\u6d89\u53ca\u5730\u5740\u548c\u6570\u636e\u554a\uff0c\u4ece CPU \u6267\u884c\u5355\u5143\u6765\u770b\u6ca1\u5565\u533a\u522b\u3002\u5982\u679c\u6309\u4f60\u7684\u5047\u8bbe\u6ca1\u6709\u4e0a\u4e0b\u6587\uff0c\u73b0\u5728\u4e3b\u6d41 CPU \u7684 Cache \u662f\u5199\u56de\u7b56\u7565\uff0c\u6240\u4ee5\u5199\u4f1a\u76f4\u63a5 Cache hit\uff0c\u800c\u8bfb\u662f\u76f4\u63a5 miss\uff0c\u6240\u4ee5\u8bfb\u66f4\u6162 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : AX5N <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    `mov eax, [ebp-4]`\uff0c\u628a\u5185\u5b58\u91cc\u7684\u67d0\u4e2a\u503c\u590d\u5236\u5230\u5bc4\u5b58\u5668\u4e0a\uff0c`mov [ebp-4], 5`\uff0c\u628a\u67d0\u4e2a\u503c\u76f4\u63a5\u5199\u5165\u5730\u5740\u91cc\uff0c`mov eax, 5`\u628a\u67d0\u4e2a\u6570\u76f4\u63a5\u5199\u5165\u5bc4\u5b58\u5668\u91cc\uff0c`mov [ebp-4], eax`\u628a\u67d0\u4e2a\u6570\u4ece\u5bc4\u5b58\u5668\u91cc\u5199\u5165\u5230\u5185\u5b58\u91cc\u3002\u8fd9 4 \u4e2a\u64cd\u4f5c\u4f60\u65e2\u53ef\u4ee5\u770b\u6210\u662f\u8bfb\uff0c\u4e5f\u53ef\u4ee5\u770b\u6210\u662f\u5199\uff0c\u4e0d\u8fc7\u8bfb\u4f3c\u4e4e\u90fd\u662f\u5148\u590d\u5236\u5230\u5bc4\u5b58\u5668\u4e0a\uff1f<\/p>\n

    \u9b3c\u77e5\u9053\u8c01\u6bd4\u8f83\u5feb\u662f\u6bd4\u8f83\u6162\uff0c\u4f60\u53ef\u4ee5\u7528 c++\u5199\u4e2a\u5faa\u73af\u81ea\u5df1\u53bb\u6d4b\u4e00\u4e0b\u554a\u3002\u7f16\u8bd1\u4e4b\u540e\u518d\u7528\u8c03\u8bd5\u5668\u53bb\u6539\u4e0b\u6c47\u7f16\u4ee3\u7801\u5c31\u597d\u4e86\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : OysterQAQ <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @vk42 cpu \u591a\u7ea7\u7f13\u5b58\u7b56\u7565\u4e0d\u540c\uff0c <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : CRVV <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    https:\/\/software.intel.com\/sites\/landingpage\/IntrinsicsGuide\/#text=vmovdqu&techs=AVX&expand=5655,3418<\/p>\n

    \u5355\u7eaf\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\u7684\u8bdd\uff0c\u968f\u4fbf\u627e\u4e00\u5bf9 load \u548c store \u6307\u4ee4\u770b\u6587\u6863\u5c31\u597d\u4e86
    \u6240\u4ee5\u4e0d\u540c\u7684\u5904\u7406\u5668\u4e0a\u4e0d\u4e00\u6837\uff0cIntel \u67b6\u6784\u4e0a load store \u6307\u4ee4\u6709\u4e00\u5927\u5806\uff0c\u4f30\u8ba1\u8fd9\u4e2a\u6570\u5b57\u8fd8\u4f1a\u5404\u4e0d\u76f8\u540c\u3002
    \u4e0a\u9762\u94fe\u63a5\u91cc\u7684\u8fd9\u4e00\u5bf9\u6307\u4ee4\uff0c\u5728 Icelake \u4e0a\u662f store \u7684\u5f00\u9500\u6bd4 load \u5c0f<\/p>\n

    \u5f53\u7136\uff0c\u4ee5\u4e0a\u56de\u7b54\u5176\u5b9e\u6ca1\u6709\u610f\u4e49\uff0c\u56e0\u4e3a\u5982\u4e00\u6240\u8bf4\u8fd9\u4e2a\u6570\u5b57\u6ca1\u6709\u7528\u3002<\/p>\n

    \u4e0d\u8fc7\uff0c\u5982\u679c\u4f60\u8981\u505a\u7684\u662f\u4e00\u4e2a\u5e76\u53d1\u7684\u7cfb\u7edf\uff0c\u53ef\u80fd\u662f cpu core \u5e76\u884c\u5de5\u4f5c\uff0c\u4e5f\u53ef\u80fd\u662f\u4f60\u90e8\u7f72\u4e86\u4e00\u4e2a\u96c6\u7fa4\u6765\u5904\u7406\u8bf7\u6c42\u3002
    \u90a3\u4e48\uff0c \u5728\u5f88\u591a\u60c5\u51b5\u4e0b\uff0c\u6700\u540e\u7cfb\u7edf\u7684\u74f6\u9888\u662f\u5728\u5bf9\u540c\u4e00\u4e2a\u4f4d\u7f6e\u7684\u5199\u64cd\u4f5c\u4e0a\u3002
    \u6bd4\u5982 atomic counter\uff0c\u4e0d\u8bba\u662f cpu \u4e0a\u5b9e\u73b0\u7684\u8fd8\u662f Redis \u5b9e\u73b0\u7684\uff0c\u8fd9\u4e2a\u5199\u64cd\u4f5c\u90fd\u4e0d\u53ef\u80fd\u88ab\u65e0\u9650\u6269\u5c55\uff0c\u5728 cpu core \u8db3\u591f\u591a\u6216\u8005\u5e76\u53d1\u8bf7\u6c42\u8db3\u591f\u591a\u7684\u65f6\u5019\u5c31\u4f1a\u6210\u4e3a\u74f6\u9888\u3002<\/p>\n

    \u6240\u4ee5\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u8bbe\u8ba1\u67b6\u6784 \/\u7b97\u6cd5\u65f6\uff0c\u4f1a\u8ba9\u5199\u64cd\u4f5c\u5c11\u4e00\u4e9b\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n","protected":false},"excerpt":{"rendered":"

    \u4e00\u4e2a\u5f31\u503c\u7684\u95ee\u9898\uff0c\u8bfb\u7684\u6210\u672c\u6bd4\u5199\u4f4e\u591a\u5c11…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/159292"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=159292"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/159292\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=159292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=159292"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=159292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}