{"id":5101,"date":"2020-09-12T15:12:33","date_gmt":"2020-09-12T07:12:33","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5101"},"modified":"2020-09-12T15:17:39","modified_gmt":"2020-09-12T07:17:39","slug":"%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9a%e8%af%b4%e8%af%b4%e9%9b%b6%e6%8b%b7%e8%b4%9d%ef%bc%8cmmap%e5%92%8csendfile","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5101","title":{"rendered":"\u9762\u8bd5\u5b98\uff1a\u8bf4\u8bf4\u96f6\u62f7\u8d1d\uff0cmmap\u548csendFile"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u7f8e\u56e2\u4e00\u9762\uff1a\u8bf4\u8bf4\u4ec0\u4e48\u662f\u96f6\u62f7\u8d1d\uff1f<\/p>\n\n\n\n<p 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class=\"wp-block-paragraph\">\u90a3\u4ec0\u4e48\u662f DMA \u62f7\u8d1d\u5462\uff0cDMA\uff08DirectMemoryAccess\uff0c\u76f4\u63a5\u5185\u5b58\u5b58\u53d6\uff09\u5176\u5b9e\u5c31\u662f\u56e0\u4e3a CPU \u8001\u54e5\u592a\u7d2f\u4e86\uff0c\u6240\u4ee5\u627e\u4e86\u4e2a\u5c0f\u5f1f\uff0c\u5c31\u662f DMA \u66ff\u4ed6\u5b8c\u6210\u4e00\u90e8\u5206\u7684\u62f7\u8d1d\u5de5\u4f5c\uff0c\u8fd9\u6837 CPU \u5c31\u80fd\u53bb\u505a\u5176\u4ed6\u4e8b\u60c5\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bb2\u5b8c\u4e86\u5185\u6838\u6001\u548c\u7528\u6237\u6001\u8fd8\u6709 DMA \u7684\u5927\u6982\u610f\u601d\uff0c\u6211\u4eec\u63a5\u7740\u56de\u5230\u521a\u624d\u7684 IO \u6d41\u7a0b\u4e2d\uff0c\u7b2c\u4e00\u6b65\u6211\u4eec\u5c06\u6587\u4ef6\u4ece\u78c1\u76d8\u6587\u4ef6\u8bfb\u5230\u4e86\u7528\u6237\u7f13\u51b2\u533a\uff0c\u6b64\u65f6\u7ecf\u5386\u4e86\u4e00\u6b21\u4e0a\u4e0b\u6587\u5207\u6362\u548c\u4e00\u6b21\u62f7\u8d1d\u3002<\/p>\n\n\n\n<p 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\u64cd\u4f5c\u5b8c\u6210\u4e4b\u540e\uff0c\u53c8\u4ece\u5185\u6838\u6001\u5207\u6362\u4e3a\u7528\u6237\u6001\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u4e0a\u9762\u7684\u6b65\u9aa4\u53ef\u4ee5\u53d1\u73b0\u4f20\u7edf\u7684 IO \u64cd\u4f5c\u6267\u884c\uff0c\u6709 4 \u6b21\u4e0a\u4e0b\u6587\u7684\u5207\u6362\u548c 4 \u6b21\u62f7\u8d1d\uff0c\u662f\u4e0d\u662f\u5f88\u7e41\u7410\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u96f6\u62f7\u8d1d\u7684\u8bdd\uff0c\u4e00\u822c\u6709 mmap \u548c sendFile \u4e24\u79cd\uff0c\u4e00\u4e2a\u4e00\u4e2a\u6765\u8bf4\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">mmap<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">mmap \u662f\u4e00\u79cd\u5185\u5b58\u6620\u5c04\u6280\u672f\uff0cmmap \u76f8\u6bd4\u4e8e\u4f20\u7edf\u7684 IO \u6765\u8bf4\uff0c\u5176\u5b9e\u5c31\u662f\u5c11\u4e86 1 \u6b21 CPU \u62f7\u8d1d\u800c\u5df2\uff0c\u4e0a\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/2020\/0-cp-1.png\" alt=\"\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f20\u7edf IO \u91cc\u9762\u4ece\u5185\u6838\u7f13\u51b2\u533a\u5230\u7528\u6237\u7f13\u51b2\u533a\u6709\u4e00\u6b21 CPU \u62f7\u8d1d\uff0c\u4ece\u7528\u6237\u7f13\u51b2\u533a\u5230 Socket \u7f13\u51b2\u533a\u53c8\u6709\u4e00\u6b21 CPU \u62f7\u8d1d\u3002mmap \u5219\u4e00\u6b65\u5230\u4f4d\uff0c\u76f4\u63a5\u57fa\u4e8e CPU \u5c06\u5185\u6838\u7f13\u51b2\u533a\u7684\u6570\u636e\u62f7\u8d1d\u5230\u4e86 Socket \u7f13\u51b2\u533a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e4b\u6240\u4ee5\u80fd\u591f\u51cf\u5c11\u4e00\u6b21\u62f7\u8d1d\uff0c\u5c31\u662f\u56e0\u4e3a mmap \u76f4\u63a5\u5c06\u78c1\u76d8\u6587\u4ef6\u6570\u636e\u6620\u5c04\u5230\u5185\u6838\u7f13\u51b2\u533a\uff0c\u8fd9\u4e2a\u6620\u5c04\u7684\u8fc7\u7a0b\u662f\u57fa\u4e8e DMA 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class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/2020\/0-cp-2.png\" alt=\"\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230\u5728\u56fe\u4e2d\uff0c\u5df2\u7ecf\u6ca1\u6709\u4e86\u7528\u6237\u7f13\u51b2\u533a\uff0c\u56e0\u4e3a\u7528\u6237\u7f13\u51b2\u533a\u662f\u5728\u7528\u6237\u7a7a\u95f4\u7684\uff0c\u6240\u4ee5\u6ca1\u6709\u4e86\u7528\u6237\u7f13\u51b2\u533a\u4e5f\u5c31\u610f\u5473\u7740\u4e0d\u9700\u8981\u4e0a\u4e0b\u6587\u5207\u6362\u4e86\uff0c\u5c31\u7701\u7565\u4e86\u8fd9\u4e00\u6b65\u7684\u4ece\u5185\u6838\u6001\u5207\u6362\u4e3a\u7528\u6237\u6001\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u65f6\u4e5f\u4e0d\u9700\u8981\u57fa\u4e8e CPU \u5c06\u5185\u6838\u7f13\u51b2\u533a\u7684\u6570\u636e\u62f7\u8d1d\u5230 Socket \u7f13\u51b2\u533a\u4e86\uff0c\u53ea\u9700\u8981\u4ece\u5185\u6838\u7f13\u51b2\u533a\u62f7\u8d1d\u4e00\u4e9b offset \u548c length \u5230 Socket 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\u7528\u6237\u6001\uff09\u548c3 \u6b21\u62f7\u8d1d\uff08\u78c1\u76d8\u6587\u4ef6DMA\u62f7\u8d1d\u5230\u5185\u6838\u7f13\u51b2\u533a\uff0c\u5185\u6838\u7f13\u51b2\u533a CPU \u62f7\u8d1d\u5230 Socket \u7f13\u51b2\u533a\uff0cSocket \u7f13\u51b2\u533a DMA \u62f7\u8d1d\u5230\u534f\u8bae\u5f15\u64ce\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">sendfile \u662f\u5c06\u8bfb\u5230\u5185\u6838\u7a7a\u95f4\u7684\u6570\u636e\uff0c\u8f6c\u5230 socket buffer\uff0c\u8fdb\u884c\u7f51\u7edc\u53d1\u9001\uff0c\u9002\u5408\u5927\u6587\u4ef6\u4f20\u8f93\uff0c\u53ea\u9700\u8981 2 \u6b21\u4e0a\u4e0b\u6587\u5207\u6362\uff08\u7528\u6237\u6001 -&gt; \u5185\u6838\u6001 -&gt; \u7528\u6237\u6001\uff09\u548c 2 \u6b21\u62f7\u8d1d\uff08\u78c1\u76d8\u6587\u4ef6 DMA \u62f7\u8d1d\u5230\u5185\u6838\u7f13\u51b2\u533a\uff0c\u5185\u6838\u7f13\u51b2\u533a DMA \u62f7\u8d1d\u5230\u534f\u8bae\u5f15\u64ce\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\u9996\u53d1\u4e8e\u516c\u4f17\u53f7\uff1ahttps:\/\/mp.weixin.qq.com\/s\/Ps0XnqgH8KPBgmfEB5qzVA<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a 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