{"id":1413,"date":"2013-03-22T20:35:22","date_gmt":"2013-03-22T12:35:22","guid":{"rendered":"https:\/\/blog.rexdf.org\/?p=1413"},"modified":"2013-03-22T20:35:22","modified_gmt":"2013-03-22T12:35:22","slug":"%e8%bd%acc%e4%b8%ad%e8%8e%b7%e5%8f%96%e9%ab%98%e7%b2%be%e5%ba%a6%e6%97%b6%e9%97%b4%e5%b7%ae","status":"publish","type":"post","link":"https:\/\/blog.rexdf.org\/en\/2013\/03\/%e8%bd%acc%e4%b8%ad%e8%8e%b7%e5%8f%96%e9%ab%98%e7%b2%be%e5%ba%a6%e6%97%b6%e9%97%b4%e5%b7%ae\/","title":{"rendered":"[\u8f6c]C++\u4e2d\u83b7\u53d6\u9ad8\u7cbe\u5ea6\u65f6\u95f4\u5dee"},"content":{"rendered":"

 <\/p>\n

C++\u4e2d\u83b7\u53d6\u9ad8\u7cbe\u5ea6\u65f6\u95f4\u5dee<\/a><\/div>\n

\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898\u901a\u5e38\u6709\u591a\u79cd\u65b9\u6cd5\uff0c \u6211\u4eec\u603b\u60f3\u627e\u5230\u6700\u9ad8\u6548\u7684\uff0c\u6240\u4ee5\u9700\u8981\u5bf9\u6bd4\u4e0d\u540c\u7b97\u6cd5\u6267\u884c\u6240\u7528\u7684\u65f6\u95f4\u3002\u53ef\u60dc\u7684\u662f\uff0cC++\u4e2d\u63d0\u4f9b\u7684\u65b9\u6cd5\u4e00\u822c\u53ea\u80fd\u7cbe\u786e\u5230\u6beb\u79d2\u7ea7\u3002<\/p>\n

\u63d0\u4f9b\u4e00\u79cd\u66f4\u52a0\u7cbe\u786e\u7684\u65b9\u6cd5\u3002\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u5728C++\u4e2d\u8fd9\u6837\u5199\uff1a<\/p>\n

\n
\r\n__declspec (naked) unsigned __int64 GetCpuCycle( void )\r\n{\r\n    _asm\r\n    {\r\n        rdtsc\r\n        ret\r\n    }\r\n}\r\n<\/pre>\n<\/div>\n
RDTSC\u7684\u8fd4\u56de\u503c\u5b58\u653e\u5728EDX EAX\u4e2d\uff0c EDX\u4e3a\u9ad832\u4f4d\uff0cEAX\u4e3a\u4f4e32\u4f4d\u3002\u8fd9\u91cc\u7684 RDTSC \u6307\u4ee4( Read Time Stamp Counter )\uff0c \u83b7\u5f97CPU\u7684\u9ad8\u7cbe\u5ea6\u65f6\u95f4\u6233\u3002<\/p>\n
\u8fd9\u6837\u4ee5\u6765\u6211\u4eec\u5c31\u53ef\u4ee5\u5728\u968f\u5904\u83b7\u5f97\u5f53\u524d\u7684CPU\u81ea\u4e0a\u7535\u4ee5\u6765\u7684\u65f6\u95f4\u5468\u671f\u6570\u4e86\uff1a<\/p>\n
unsigned __int64 iCpuCycle = GetCpuCycle();<\/p>\n
\u6839\u636e\u8fd9\u4e2a\u6570\u5b57\u6211\u4eec\u53ef\u4ee5\u8ba1\u7b97\u51fa\u4e0a\u7535\u4ee5\u6765\u6240\u7ecf\u5386\u7684\u65f6\u95f4( \u79d2s )\uff1a<\/p>\n
second = iCpuCycle \/ CPU\u4e3b\u9891\u7387( HZ );<\/p>\n
1GHZ = 1,000 MHZ = 1,000,000 KHZ = 1,000,000,000 HZ;<\/p>\n
\u83b7\u53d6\u4e24\u6b21\u4f5c\u5dee\u5c31\u53ef\u4ee5\u5f97\u5230\u8fd0\u884c\u7684\u65f6\u95f4\u4e86\u3002\u5176\u5b9e\u6ca1\u5fc5\u8981\u6362\u7b97\u6210\u65f6\u95f4\uff0c\u5173\u6ce8\u5dee\u503c\u5c31\u884c\u4e86\u3002<\/p>\n
\n
PS\uff1a<\/p>\n
\u53ef\u4ee5\u653e\u5fc3\u4e00\u4e2aunsigned __int64 \u4e0d\u4f1a\u6ea2\u51fa – – \u53ef\u4ee5\u8ba1\u7b97\u4e00\u4e0b\u4f60\u7684CPU\u80fd\u4fdd\u5b58\u591a\u5c11\u5e74\u7684\u65f6\u95f4\u3002\u3002<\/p>\n
\u6839\u636e\u8fd9\u4e00\u65b9\u6cd5\u6709\u51e0\u4e2a\u597d\u5904\uff1a \u4e00\u662f\u7cbe\u5ea6\u9ad8\uff0c\u4e8c\u662f\u51fd\u6570\u8c03\u7528\u5f00\u9500\u6700\u5c0f\uff0c\u4e09\u662f\u5e73\u53f0\u9650\u5236\u5c0f\uff0c\u56db\u662f\u5177\u6709\u548cCPU\u4e3b\u9891\u76f8\u5bf9\u5e94\u7684\u76f4\u63a5\u5173\u7cfb\u3002\u3002\u3002 \u4f46\u662f\u7531\u4e8e\u7cbe\u5ea6\u9ad8\uff0c\u5f97\u5230\u7684\u6570\u5b57\u6d6e\u52a8\u6bd4\u8f83\u5927\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
  C++\u4e2d\u83b7\u53d6\u9ad8\u7cbe\u5ea6\u65f6\u95f4\u5dee \u89e3\u51b3\u4e00\u4e2a\u95ee\u9898\u901a\u5e38\u6709\u591a\u79cd\u65b9\u6cd5\uff0c \u6211\u4eec\u603b\u60f3\u627e\u5230\u6700\u9ad8\u6548\u7684\uff0c\u6240\u4ee5\u9700\u8981\u5bf9\u6bd4\u4e0d\u540c\u7b97\u6cd5\u6267\u884c\u6240\u7528\u7684\u65f6\u95f4\u3002\u53ef\u60dc\u7684\u662f\uff0cC++\u4e2d\u63d0\u4f9b\u7684\u65b9\u6cd5\u4e00\u822c\u53ea\u80fd\u7cbe\u786e\u5230\u6beb\u79d2\u7ea7\u3002 \u63d0\u4f9b\u4e00\u79cd\u66f4\u52a0\u7cbe\u786e\u7684\u65b9\u6cd5\u3002\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u5728C++\u4e2d\u8fd9\u6837\u5199\uff1a __declspec (naked) unsigned __int64 GetCpuCycle( void ) { _asm { rdtsc ret } } RDTSC\u7684\u8fd4\u56de\u503c\u5b58\u653e\u5728EDX EAX\u4e2d\uff0c EDX\u4e3a\u9ad832\u4f4d\uff0cEAX\u4e3a\u4f4e32\u4f4d\u3002\u8fd9\u91cc\u7684 RDTSC \u6307\u4ee4( Read Time Stamp Counter )\uff0c \u83b7\u5f97CPU\u7684\u9ad8\u7cbe\u5ea6\u65f6\u95f4\u6233\u3002 \u8fd9\u6837\u4ee5\u6765\u6211\u4eec\u5c31\u53ef\u4ee5\u5728\u968f\u5904\u83b7\u5f97\u5f53\u524d\u7684CPU\u81ea\u4e0a\u7535\u4ee5\u6765\u7684\u65f6\u95f4\u5468\u671f\u6570\u4e86\uff1a unsigned __int64 iCpuCycle = GetCpuCycle(); \u6839\u636e\u8fd9\u4e2a\u6570\u5b57\u6211\u4eec\u53ef\u4ee5\u8ba1\u7b97\u51fa\u4e0a\u7535\u4ee5\u6765\u6240\u7ecf\u5386\u7684\u65f6\u95f4( \u79d2s )\uff1a second … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[18],"tags":[129],"class_list":["post-1413","post","type-post","status-publish","format-standard","hentry","category-program","tag-129"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/posts\/1413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/comments?post=1413"}],"version-history":[{"count":0,"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/posts\/1413\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/media?parent=1413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/categories?post=1413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.rexdf.org\/en\/wp-json\/wp\/v2\/tags?post=1413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}