{"id":4885,"date":"2022-03-28T18:44:48","date_gmt":"2022-03-28T10:44:48","guid":{"rendered":"https:\/\/egonlin.com\/?p=4885"},"modified":"2022-04-26T13:46:53","modified_gmt":"2022-04-26T05:46:53","slug":"%e7%ac%ac%e5%85%ab%e7%af%87%ef%bc%9aio%e6%a8%a1%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=4885","title":{"rendered":"\u7b2c\u516b\u7bc7\uff1aIO\u6a21\u578b"},"content":{"rendered":"<h1>IO\u6a21\u578b<\/h1>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/python\u5e76\u53d1\u7f16\u7a0b\u4e4bIO\u6a21\u578b1.jpg'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/python\u5e76\u53d1\u7f16\u7a0b\u4e4bIO\u6a21\u578b1.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h2>\u4e00\u3001\u524d\u5e8f\u77e5\u8bc6\u56de\u987e<\/h2>\n<p>\u4e3a\u4e86\u66f4\u597d\u5730\u4e86\u89e3IO\u6a21\u578b\uff0c\u6211\u4eec\u9700\u8981\u4e8b\u5148\u56de\u987e\u4e0b\uff1a\u540c\u6b65\u3001\u5f02\u6b65\u3001\u963b\u585e\u3001\u975e\u963b\u585e\u3002<\/p>\n<h3>1\u3001\u540c\u6b65<\/h3>\n<p>\u6240\u8c13\u540c\u6b65\uff0c\u5c31\u662f\u5728\u53d1\u51fa\u4e00\u4e2a\u529f\u80fd\u8c03\u7528\u65f6\uff0c\u5728\u6ca1\u6709\u5f97\u5230\u7ed3\u679c\u4e4b\u524d\uff0c\u8be5\u8c03\u7528\u5c31\u4e0d\u4f1a\u8fd4\u56de\u3002\u6309\u7167\u8fd9\u4e2a\u5b9a\u4e49\uff0c\u5176\u5b9e\u7edd\u5927\u591a\u6570\u51fd\u6570\u90fd\u662f\u540c\u6b65\u8c03\u7528\u3002\u4f46\u662f\u4e00\u822c\u800c\u8a00\uff0c\u6211\u4eec\u5728\u8bf4\u540c\u6b65\u3001\u5f02\u6b65\u7684\u65f6\u5019\uff0c\u7279\u6307\u90a3\u4e9b\u9700\u8981\u5176\u4ed6\u90e8\u4ef6\u534f\u4f5c\u6216\u8005\u9700\u8981\u4e00\u5b9a\u65f6\u95f4\u5b8c\u6210\u7684\u4efb\u52a1\u3002<\/p>\n<pre><code class=\"language-python\"># \u4e3e\u4f8b\uff1a\n# 1\u3001multiprocessing.Pool\u4e0b\u7684apply #\u53d1\u8d77\u540c\u6b65\u8c03\u7528\u540e\uff0c\u5c31\u5728\u539f\u5730\u7b49\u7740\u4efb\u52a1\u7ed3\u675f\uff0c\u6839\u672c\u4e0d\u8003\u8651\u4efb\u52a1\u662f\u5728\u8ba1\u7b97\u8fd8\u662f\u5728io\u963b\u585e\uff0c\u603b\u4e4b\u5c31\u662f\u4e00\u80a1\u8111\u5730\u7b49\u4efb\u52a1\u7ed3\u675f\n# 2\u3001concurrent.futures.ProcessPoolExecutor().submit(func,).result()\n# 3\u3001concurrent.futures.ThreadPoolExecutor().submit(func,).result()<\/code><\/pre>\n<h3>2\u3001\u5f02\u6b65<\/h3>\n<p>\u5f02\u6b65\u7684\u6982\u5ff5\u548c\u540c\u6b65\u76f8\u5bf9\u3002\u5f53\u4e00\u4e2a\u5f02\u6b65\u529f\u80fd\u8c03\u7528\u53d1\u51fa\u540e\uff0c\u8c03\u7528\u8005\u4e0d\u80fd\u7acb\u523b\u5f97\u5230\u7ed3\u679c\u3002\u5f53\u8be5\u5f02\u6b65\u529f\u80fd\u5b8c\u6210\u540e\uff0c\u901a\u8fc7\u72b6\u6001\u3001\u901a\u77e5\u6216\u56de\u8c03\u6765\u901a\u77e5\u8c03\u7528\u8005\u3002\u5982\u679c\u5f02\u6b65\u529f\u80fd\u7528\u72b6\u6001\u6765\u901a\u77e5\uff0c\u90a3\u4e48\u8c03\u7528\u8005\u5c31\u9700\u8981\u6bcf\u9694\u4e00\u5b9a\u65f6\u95f4\u68c0\u67e5\u4e00\u6b21\uff0c\u6548\u7387\u5c31\u5f88\u4f4e\uff08\u6709\u4e9b\u521d\u5b66\u591a\u7ebf\u7a0b\u7f16\u7a0b\u7684\u4eba\uff0c\u603b\u559c\u6b22\u7528\u4e00\u4e2a\u5faa\u73af\u53bb\u68c0\u67e5\u67d0\u4e2a\u53d8\u91cf\u7684\u503c\uff0c\u8fd9\u5176\u5b9e\u662f\u4e00 \u79cd\u5f88\u4e25\u91cd\u7684\u9519\u8bef\uff09\u3002\u5982\u679c\u662f\u4f7f\u7528\u901a\u77e5\u7684\u65b9\u5f0f\uff0c\u6548\u7387\u5219\u5f88\u9ad8\uff0c\u56e0\u4e3a\u5f02\u6b65\u529f\u80fd\u51e0\u4e4e\u4e0d\u9700\u8981\u505a\u989d\u5916\u7684\u64cd\u4f5c\u3002\u81f3\u4e8e\u56de\u8c03\u51fd\u6570\uff0c\u5176\u5b9e\u548c\u901a\u77e5\u6ca1\u592a\u591a\u533a\u522b\u3002<\/p>\n<pre><code class=\"language-python\"># \u4e3e\u4f8b\uff1a\n# 1\u3001multiprocessing.Pool().apply_async() #\u53d1\u8d77\u5f02\u6b65\u8c03\u7528\u540e\uff0c\u5e76\u4e0d\u4f1a\u7b49\u5f85\u4efb\u52a1\u7ed3\u675f\u624d\u8fd4\u56de\uff0c\u76f8\u53cd\uff0c\u4f1a\u7acb\u5373\u83b7\u53d6\u4e00\u4e2a\u4e34\u65f6\u7ed3\u679c\uff08\u5e76\u4e0d\u662f\u6700\u7ec8\u7684\u7ed3\u679c\uff0c\u53ef\u80fd\u662f\u5c01\u88c5\u597d\u7684\u4e00\u4e2a\u5bf9\u8c61\uff09\u3002\n# 2\u3001concurrent.futures.ProcessPoolExecutor(3).submit(func,)\n# 3\u3001concurrent.futures.ThreadPoolExecutor(3).submit(func,)<\/code><\/pre>\n<h3>3\u3001\u963b\u585e<\/h3>\n<p>\u963b\u585e\u8c03\u7528\u662f\u6307\u8c03\u7528\u7ed3\u679c\u8fd4\u56de\u4e4b\u524d\uff0c\u5f53\u524d\u7ebf\u7a0b\u4f1a\u88ab\u6302\u8d77\uff08\u5982\uff1a\u9047\u5230IO\u64cd\u4f5c\uff09\u3002\u51fd\u6570\u53ea\u6709\u5728\u5f97\u5230\u7ed3\u679c\u4e4b\u540e\u624d\u4f1a\u5c06\u963b\u585e\u7684\u7ebf\u7a0b\u6fc0\u6d3b\u3002\u6709\u4eba\u4e5f\u8bb8\u4f1a\u628a\u963b\u585e\u8c03\u7528\u548c\u540c\u6b65\u8c03\u7528\u7b49\u540c\u8d77\u6765\uff0c\u5b9e\u9645\u4e0a\u4ed6\u662f\u4e0d\u540c\u7684\u3002\u5bf9\u4e8e\u540c\u6b65\u8c03\u7528\u6765\u8bf4\uff0c\u5f88\u591a\u65f6\u5019\u5f53\u524d\u7ebf\u7a0b\u8fd8\u662f\u6fc0\u6d3b\u7684\uff0c\u53ea\u662f\u4ece\u903b\u8f91\u4e0a\u5f53\u524d\u51fd\u6570\u6ca1\u6709\u8fd4\u56de\u800c\u5df2\u3002<\/p>\n<pre><code class=\"language-python\"># \u4e3e\u4f8b\uff1a\n# 1\u3001\u540c\u6b65\u8c03\u7528\uff1aapply\u4e00\u4e2a\u7d2f\u8ba11\u4ebf\u6b21\u7684\u4efb\u52a1\uff0c\u8be5\u8c03\u7528\u4f1a\u4e00\u76f4\u7b49\u5f85\uff0c\u76f4\u5230\u4efb\u52a1\u8fd4\u56de\u7ed3\u679c\u4e3a\u6b62\uff0c\u4f46\u5e76\u672a\u963b\u585e\u4f4f\uff08\u5373\u4fbf\u662f\u88ab\u62a2\u8d70cpu\u7684\u6267\u884c\u6743\u9650\uff0c\u90a3\u4e5f\u662f\u5904\u4e8e\u5c31\u7eea\u6001\uff09;\n# 2\u3001\u963b\u585e\u8c03\u7528\uff1a\u5f53socket\u5de5\u4f5c\u5728\u963b\u585e\u6a21\u5f0f\u7684\u65f6\u5019\uff0c\u5982\u679c\u6ca1\u6709\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u8c03\u7528recv\u51fd\u6570\uff0c\u5219\u5f53\u524d\u7ebf\u7a0b\u5c31\u4f1a\u88ab\u6302\u8d77\uff0c\u76f4\u5230\u6709\u6570\u636e\u4e3a\u6b62\u3002<\/code><\/pre>\n<h3>4\u3001\u975e\u963b\u585e<\/h3>\n<p>\u975e\u963b\u585e\u548c\u963b\u585e\u7684\u6982\u5ff5\u76f8\u5bf9\u5e94\uff0c\u6307\u5728\u4e0d\u80fd\u7acb\u523b\u5f97\u5230\u7ed3\u679c\u4e4b\u524d\u4e5f\u4f1a\u7acb\u523b\u8fd4\u56de\uff0c\u540c\u65f6\u8be5\u51fd\u6570\u4e0d\u4f1a\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\u3002<\/p>\n<h3>5\u3001\u603b\u7ed3<\/h3>\n<p>\u540c\u6b65\u4e0e\u5f02\u6b65\u9488\u5bf9\u7684\u662f\u51fd\u6570\/\u4efb\u52a1\u7684\u8c03\u7528\u65b9\u5f0f\uff1a\u540c\u6b65\u5c31\u662f\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u53d1\u8d77\u4e00\u4e2a\u51fd\u6570\uff08\u4efb\u52a1\uff09\u8c03\u7528\u7684\u65f6\u5019\uff0c\u4e00\u76f4\u7b49\u5230\u51fd\u6570\uff08\u4efb\u52a1\uff09\u5b8c\u6210\uff0c\u800c\u8fdb\u7a0b\u7ee7\u7eed\u5904\u4e8e\u6fc0\u6d3b\u72b6\u6001\u3002\u800c\u5f02\u6b65\u60c5\u51b5\u4e0b\u662f\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u53d1\u8d77\u4e00\u4e2a\u51fd\u6570\uff08\u4efb\u52a1\uff09\u8c03\u7528\u7684\u65f6\u5019\uff0c\u4e0d\u4f1a\u7b49\u51fd\u6570\u8fd4\u56de\uff0c\u800c\u662f\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\u5f53\uff0c\u51fd\u6570\u8fd4\u56de\u7684\u65f6\u5019\u901a\u8fc7\u72b6\u6001\u3001\u901a\u77e5\u3001\u4e8b\u4ef6\u7b49\u65b9\u5f0f\u901a\u77e5\u8fdb\u7a0b\u4efb\u52a1\u5b8c\u6210\u3002<\/p>\n<p>\u963b\u585e\u4e0e\u975e\u963b\u585e\u9488\u5bf9\u7684\u662f\u8fdb\u7a0b\u6216\u7ebf\u7a0b\uff1a\u963b\u585e\u662f\u5f53\u8bf7\u6c42\u4e0d\u80fd\u6ee1\u8db3\u7684\u65f6\u5019\u5c31\u5c06\u8fdb\u7a0b\u6302\u8d77\uff0c\u800c\u975e\u963b\u585e\u5219\u4e0d\u4f1a\u963b\u585e\u5f53\u524d\u8fdb\u7a0b\u3002<\/p>\n<h2>\u4e8c\u3001IO\u6a21\u578b\u4ecb\u7ecd<\/h2>\n<p>\u540c\u6b65\uff08synchronous\uff09 IO\u548c\u5f02\u6b65\uff08asynchronous\uff09 IO\uff0c\u963b\u585e\uff08blocking\uff09 IO\u548c\u975e\u963b\u585e\uff08non-blocking\uff09IO\u5206\u522b\u662f\u4ec0\u4e48\uff0c\u5230\u5e95\u6709\u4ec0\u4e48\u533a\u522b\uff1f\u8fd9\u4e2a\u95ee\u9898\u5176\u5b9e\u4e0d\u540c\u7684\u4eba\u7ed9\u51fa\u7684\u7b54\u6848\u90fd\u53ef\u80fd\u4e0d\u540c\uff0c\u6bd4\u5982wiki\uff0c\u5c31\u8ba4\u4e3aasynchronous IO\u548cnon-blocking IO\u662f\u4e00\u4e2a\u4e1c\u897f\u3002\u8fd9\u5176\u5b9e\u662f\u56e0\u4e3a\u4e0d\u540c\u7684\u4eba\u7684\u77e5\u8bc6\u80cc\u666f\u4e0d\u540c\uff0c\u5e76\u4e14\u5728\u8ba8\u8bba\u8fd9\u4e2a\u95ee\u9898\u7684\u65f6\u5019\u4e0a\u4e0b\u6587(context)\u4e5f\u4e0d\u76f8\u540c\u3002\u6240\u4ee5\uff0c\u4e3a\u4e86\u66f4\u597d\u7684\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u5148\u9650\u5b9a\u4e00\u4e0b\u672c\u6587\u7684\u4e0a\u4e0b\u6587\u3002<\/p>\n<p>\u672c\u6587\u8ba8\u8bba\u7684\u80cc\u666f\u662fLinux\u73af\u5883\u4e0b\u7684network IO\u3002\u672c\u6587\u6700\u91cd\u8981\u7684\u53c2\u8003\u6587\u732e\u662fRichard Stevens\u7684\u201cUNIX\u00ae Network Programming Volume 1, Third Edition: The Sockets Networking\u201d\uff0c6.2\u8282\u201cI\/O Models\u201d\uff0cStevens\u5728\u8fd9\u8282\u4e2d\u8be6\u7ec6\u8bf4\u660e\u4e86\u5404\u79cdIO\u7684\u7279\u70b9\u548c\u533a\u522b\uff0c\u5982\u679c\u82f1\u6587\u591f\u597d\u7684\u8bdd\uff0c\u63a8\u8350\u76f4\u63a5\u9605\u8bfb\u3002Stevens\u7684\u6587\u98ce\u662f\u6709\u540d\u7684\u6df1\u5165\u6d45\u51fa\uff0c\u6240\u4ee5\u4e0d\u7528\u62c5\u5fc3\u770b\u4e0d\u61c2\u3002\u672c\u6587\u4e2d\u7684\u6d41\u7a0b\u56fe\u4e5f\u662f\u622a\u53d6\u81ea\u53c2\u8003\u6587\u732e\u3002<\/p>\n<p>Stevens\u5728\u6587\u7ae0\u4e2d\u4e00\u5171\u6bd4\u8f83\u4e86\u4e94\u79cdIO Model\uff1a <em> blocking IO <\/em> nonblocking IO <em> IO multiplexing <\/em> signal driven IO * asynchronous IO \u7531signal driven IO\uff08\u4fe1\u53f7\u9a71\u52a8IO\uff09\u5728\u5b9e\u9645\u4e2d\u5e76\u4e0d\u5e38\u7528\uff0c\u6240\u4ee5\u4e3b\u8981\u4ecb\u7ecd\u5176\u4f59\u56db\u79cdIO Model\u3002<\/p>\n<p>\u518d\u8bf4\u4e00\u4e0bIO\u53d1\u751f\u65f6\u6d89\u53ca\u7684\u5bf9\u8c61\u548c\u6b65\u9aa4\u3002\u5bf9\u4e8e\u4e00\u4e2anetwork IO (\u8fd9\u91cc\u6211\u4eec\u4ee5read\u4e3e\u4f8b)\uff0c\u5b83\u4f1a\u6d89\u53ca\u5230\u4e24\u4e2a\u7cfb\u7edf\u5bf9\u8c61\uff0c\u4e00\u4e2a\u662f\u8c03\u7528\u8fd9\u4e2aIO\u7684process (or thread)\uff0c\u53e6\u4e00\u4e2a\u5c31\u662f\u7cfb\u7edf\u5185\u6838(kernel)\u3002\u5f53\u4e00\u4e2aread\u64cd\u4f5c\u53d1\u751f\u65f6\uff0c\u8be5\u64cd\u4f5c\u4f1a\u7ecf\u5386\u4e24\u4e2a\u9636\u6bb5\uff1a<\/p>\n<p>\u7b49\u5f85\u6570\u636e\u51c6\u5907 (Waiting for the data to be ready)<\/p>\n<p>\u5c06\u6570\u636e\u4ece\u5185\u6838\u62f7\u8d1d\u5230\u8fdb\u7a0b\u4e2d(Copying the data from the kernel to the process)<\/p>\n<p>\u8bb0\u4f4f\u8fd9\u4e24\u70b9\u5f88\u91cd\u8981\uff0c\u56e0\u4e3a\u8fd9\u4e9bIO\u6a21\u578b\u7684\u533a\u522b\u5c31\u662f\u5728\u4e24\u4e2a\u9636\u6bb5\u4e0a\u5404\u6709\u4e0d\u540c\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u8865\u5145\uff1a<\/p>\n<p>\u8f93\u5165\u64cd\u4f5c\uff1aread\u3001readv\u3001recv\u3001recvfrom\u3001recvmsg\u51715\u4e2a\u51fd\u6570\uff0c\u5982\u679c\u4f1a\u963b\u585e\u72b6\u6001\uff0c\u5219\u4f1a\u7ecf\u7406wait data\u548ccopy data\u4e24\u4e2a\u9636\u6bb5\uff0c\u5982\u679c\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u5219\u5728wait \u4e0d\u5230data\u65f6\u629b\u51fa\u5f02\u5e38<\/p>\n<p>\u8f93\u51fa\u64cd\u4f5c\uff1awrite\u3001writev\u3001send\u3001sendto\u3001sendmsg\u51715\u4e2a\u51fd\u6570\uff0c\u5728\u53d1\u9001\u7f13\u51b2\u533a\u6ee1\u4e86\u4f1a\u963b\u585e\u5728\u539f\u5730\uff0c\u5982\u679c\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\uff0c\u5219\u4f1a\u629b\u51fa\u5f02\u5e38<\/p>\n<p>\u63a5\u6536\u5916\u6765\u94fe\u63a5\uff1aaccept\uff0c\u4e0e\u8f93\u5165\u64cd\u4f5c\u7c7b\u4f3c<\/p>\n<p>\u53d1\u8d77\u5916\u51fa\u94fe\u63a5\uff1aconnect\uff0c\u4e0e\u8f93\u51fa\u64cd\u4f5c\u7c7b\u4f3c<\/p>\n<h2>\u4e09\u3001\u963b\u585eIO\uff08Blocking IO\uff09<\/h2>\n<p>\u5728Linux\u4e2d\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u6240\u6709\u7684socket\u90fd\u662fblocking\uff0c\u4e00\u4e2a\u5178\u578b\u7684\u8bfb\u64cd\u4f5c\u6d41\u7a0b\u5927\u6982\u662f\u8fd9\u6837\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/wps41.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/wps41.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u5f53\u7528\u6237\u8fdb\u7a0b\u8c03\u7528\u4e86recvfrom\u8fd9\u4e2a\u7cfb\u7edf\u8c03\u7528\uff0ckernel\u5c31\u5f00\u59cb\u4e86IO\u7684\u7b2c\u4e00\u4e2a\u9636\u6bb5\uff1a\u51c6\u5907\u6570\u636e\u3002\u5bf9\u4e8enetwork io\u6765\u8bf4\uff0c\u5f88\u591a\u65f6\u5019\u6570\u636e\u5728\u4e00\u5f00\u59cb\u8fd8\u6ca1\u6709\u5230\u8fbe\uff08\u6bd4\u5982\uff0c\u8fd8\u6ca1\u6709\u6536\u5230\u4e00\u4e2a\u5b8c\u6574\u7684UDP\u5305\uff09\uff0c\u8fd9\u4e2a\u65f6\u5019kernel\u5c31\u8981\u7b49\u5f85\u8db3\u591f\u7684\u6570\u636e\u5230\u6765\u3002<\/p>\n<p>\u800c\u5728\u7528\u6237\u8fdb\u7a0b\u8fd9\u8fb9\uff0c\u6574\u4e2a\u8fdb\u7a0b\u4f1a\u88ab\u963b\u585e\u3002\u5f53kernel\u4e00\u76f4\u7b49\u5230\u6570\u636e\u51c6\u5907\u597d\u4e86\uff0c\u5b83\u5c31\u4f1a\u5c06\u6570\u636e\u4ecekernel\u4e2d\u62f7\u8d1d\u5230\u7528\u6237\u5185\u5b58\uff0c\u7136\u540ekernel\u8fd4\u56de\u7ed3\u679c\uff0c\u7528\u6237\u8fdb\u7a0b\u624d\u89e3\u9664block\u7684\u72b6\u6001\uff0c\u91cd\u65b0\u8fd0\u884c\u8d77\u6765\u3002 <strong><em>*\u6240\u4ee5\uff0cblocking IO\u7684\u7279\u70b9\u5c31\u662f\u5728IO\u6267\u884c\u7684\u4e24\u4e2a\u9636\u6bb5\uff08\u7b49\u5f85\u6570\u636e\u548c\u62f7\u8d1d\u6570\u636e\u4e24\u4e2a\u9636\u6bb5\uff09\u90fd\u88abblock\u4e86\u3002*<\/em><\/strong><\/p>\n<p>\u51e0\u4e4e\u6240\u6709\u7684\u7a0b\u5e8f\u5458\u7b2c\u4e00\u6b21\u63a5\u89e6\u5230\u7684\u7f51\u7edc\u7f16\u7a0b\u90fd\u662f\u4ecelisten()\u3001send()\u3001recv() \u7b49\u63a5\u53e3\u5f00\u59cb\u7684\uff0c\u4f7f\u7528\u8fd9\u4e9b\u63a5\u53e3\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u6784\u5efa\u670d\u52a1\u5668\/\u5ba2\u6237\u673a\u7684\u6a21\u578b\u3002\u7136\u800c\u5927\u90e8\u5206\u7684socket\u63a5\u53e3\u90fd\u662f\u963b\u585e\u578b\u7684\u3002\u5982\u4e0b\u56fe:<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/wps42.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/wps42.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>PS\uff1a\u6240\u8c13\u963b\u585e\u578b\u63a5\u53e3\u662f\u6307\u7cfb\u7edf\u8c03\u7528\uff08\u4e00\u822c\u662fIO\u63a5\u53e3\uff09\u4e0d\u8fd4\u56de\u8c03\u7528\u7ed3\u679c\u5e76\u8ba9\u5f53\u524d\u7ebf\u7a0b\u4e00\u76f4\u963b\u585e\uff0c\u53ea\u6709\u5f53\u8be5\u7cfb\u7edf\u8c03\u7528\u83b7\u5f97\u7ed3\u679c\u6216\u8005\u8d85\u65f6\u51fa\u9519\u65f6\u624d\u8fd4\u56de\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u9664\u975e\u7279\u522b\u6307\u5b9a\uff0c\u51e0\u4e4e\u6240\u6709\u7684IO\u63a5\u53e3 ( \u5305\u62ecsocket\u63a5\u53e3 ) \u90fd\u662f\u963b\u585e\u578b\u7684\u3002\u8fd9\u7ed9\u7f51\u7edc\u7f16\u7a0b\u5e26\u6765\u4e86\u4e00\u4e2a\u5f88\u5927\u7684\u95ee\u9898\uff0c\u5982\u5728\u8c03\u7528recv(1024)\u7684\u540c\u65f6\uff0c\u7ebf\u7a0b\u5c06\u88ab\u963b\u585e\uff0c\u5728\u6b64\u671f\u95f4\uff0c\u7ebf\u7a0b\u5c06\u65e0\u6cd5\u6267\u884c\u4efb\u4f55\u8fd0\u7b97\u6216\u54cd\u5e94\u4efb\u4f55\u7684\u7f51\u7edc\u8bf7\u6c42\u3002<\/p>\n<p>\u4e00\u4e2a\u7b80\u5355\u7684\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n<p><em># \u5728\u670d\u52a1\u5668\u7aef\u4f7f\u7528\u591a\u7ebf\u7a0b\uff08\u6216\u591a\u8fdb\u7a0b\uff09\u3002\u591a\u7ebf\u7a0b\uff08\u6216\u591a\u8fdb\u7a0b\uff09\u7684\u76ee\u7684\u662f\u8ba9\u6bcf\u4e2a\u8fde\u63a5\u90fd\u62e5\u6709\u72ec\u7acb\u7684\u7ebf\u7a0b\uff08\u6216\u8fdb\u7a0b\uff09\uff0c\u8fd9\u6837\u4efb\u4f55\u4e00\u4e2a\u8fde\u63a5\u7684\u963b\u585e\u90fd\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6\u7684\u8fde\u63a5\u3002<\/em><\/p>\n<p>\u8be5\u65b9\u6848\u7684\u95ee\u9898\u662f\uff1a<\/p>\n<p><em># \u5f00\u542f\u591a\u8fdb\u7a0b\u6216\u90fd\u7ebf\u7a0b\u7684\u65b9\u5f0f\uff0c\u5728\u9047\u5230\u8981\u540c\u65f6\u54cd\u5e94\u6210\u767e\u4e0a\u5343\u8def\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u5219\u65e0\u8bba\u591a\u7ebf\u7a0b\u8fd8\u662f\u591a\u8fdb\u7a0b\u90fd\u4f1a\u4e25\u91cd\u5360\u636e\u7cfb\u7edf\u8d44\u6e90\uff0c\u964d\u4f4e\u7cfb\u7edf\u5bf9\u5916\u754c\u54cd\u5e94\u6548\u7387\uff0c\u800c\u4e14\u7ebf\u7a0b\u4e0e\u8fdb\u7a0b\u672c\u8eab\u4e5f\u66f4\u5bb9\u6613\u8fdb\u5165\u5047\u6b7b\u72b6\u6001\u3002<\/em><\/p>\n<p>\u6539\u8fdb\u65b9\u6848\uff1a<\/p>\n<p><em># \u5f88\u591a\u7a0b\u5e8f\u5458\u53ef\u80fd\u4f1a\u8003\u8651\u4f7f\u7528\u201c\u7ebf\u7a0b\u6c60\u201d\u6216\u201c\u8fde\u63a5\u6c60\u201d\u3002\u201c\u7ebf\u7a0b\u6c60\u201d\u65e8\u5728\u51cf\u5c11\u521b\u5efa\u548c\u9500\u6bc1\u7ebf\u7a0b\u7684\u9891\u7387\uff0c\u5176\u7ef4\u6301\u4e00\u5b9a\u5408\u7406\u6570\u91cf\u7684\u7ebf\u7a0b\uff0c\u5e76\u8ba9\u7a7a\u95f2\u7684\u7ebf\u7a0b\u91cd\u65b0\u627f\u62c5\u65b0\u7684\u6267\u884c\u4efb\u52a1\u3002\u201c\u8fde\u63a5\u6c60\u201d\u7ef4\u6301\u8fde\u63a5\u7684\u7f13\u5b58\u6c60\uff0c\u5c3d\u91cf\u91cd\u7528\u5df2\u6709\u7684\u8fde\u63a5\u3001\u51cf\u5c11\u521b\u5efa\u548c\u5173\u95ed\u8fde\u63a5\u7684\u9891\u7387\u3002\u8fd9\u4e24\u79cd\u6280\u672f\u90fd\u53ef\u4ee5\u5f88\u597d\u7684\u964d\u4f4e\u7cfb\u7edf\u5f00\u9500\uff0c\u90fd\u88ab\u5e7f\u6cdb\u5e94\u7528\u5f88\u591a\u5927\u578b\u7cfb\u7edf\uff0c\u5982websphere\u3001tomcat\u548c\u5404\u79cd\u6570\u636e\u5e93\u7b49\u3002<\/em><\/p>\n<p>\u6539\u8fdb\u540e\u65b9\u6848\u5176\u5b9e\u4e5f\u5b58\u5728\u7740\u95ee\u9898\uff1a<\/p>\n<p><em># \u201c\u7ebf\u7a0b\u6c60\u201d\u548c\u201c\u8fde\u63a5\u6c60\u201d\u6280\u672f\u4e5f\u53ea\u662f\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u7f13\u89e3\u4e86\u9891\u7e41\u8c03\u7528IO\u63a5\u53e3\u5e26\u6765\u7684\u8d44\u6e90\u5360\u7528\u3002\u800c\u4e14\uff0c\u6240\u8c13\u201c\u6c60\u201d\u59cb\u7ec8\u6709\u5176\u4e0a\u9650\uff0c\u5f53\u8bf7\u6c42\u5927\u5927\u8d85\u8fc7\u4e0a\u9650\u65f6\uff0c\u201c\u6c60\u201d\u6784\u6210\u7684\u7cfb\u7edf\u5bf9\u5916\u754c\u7684\u54cd\u5e94\u5e76\u4e0d\u6bd4\u6ca1\u6709\u6c60\u7684\u65f6\u5019\u6548\u679c\u597d\u591a\u5c11\u3002\u6240\u4ee5\u4f7f\u7528\u201c\u6c60\u201d\u5fc5\u987b\u8003\u8651\u5176\u9762\u4e34\u7684\u54cd\u5e94\u89c4\u6a21\uff0c\u5e76\u6839\u636e\u54cd\u5e94\u89c4\u6a21\u8c03\u6574\u201c\u6c60\u201d\u7684\u5927\u5c0f\u3002<\/em><\/p>\n<p><strong><em>*\u5bf9\u5e94\u4e0a\u4f8b\u4e2d\u7684\u6240\u9762\u4e34\u7684\u53ef\u80fd\u540c\u65f6\u51fa\u73b0\u7684\u4e0a\u5343\u751a\u81f3\u4e0a\u4e07\u6b21\u7684\u5ba2\u6237\u7aef\u8bf7\u6c42\uff0c\u201c\u7ebf\u7a0b\u6c60\u201d\u6216\u201c\u8fde\u63a5\u6c60\u201d\u6216\u8bb8\u53ef\u4ee5\u7f13\u89e3\u90e8\u5206\u538b\u529b\uff0c\u4f46\u662f\u4e0d\u80fd\u89e3\u51b3\u6240\u6709\u95ee\u9898\u3002\u603b\u4e4b\uff0c\u591a\u7ebf\u7a0b\u6a21\u578b\u53ef\u4ee5\u65b9\u4fbf\u9ad8\u6548\u7684\u89e3\u51b3\u5c0f\u89c4\u6a21\u7684\u670d\u52a1\u8bf7\u6c42\uff0c\u4f46\u9762\u5bf9\u5927\u89c4\u6a21\u7684\u670d\u52a1\u8bf7\u6c42\uff0c\u591a\u7ebf\u7a0b\u6a21\u578b\u4e5f\u4f1a\u9047\u5230\u74f6\u9888\uff0c\u53ef\u4ee5\u7528\u975e\u963b\u585e\u63a5\u53e3\u6765\u5c1d\u8bd5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002*<\/em><\/strong><\/p>\n<h2>\u56db\u3001\u975e\u963b\u585eIO\uff08non-blocking IO\uff09<\/h2>\n<p>Linux\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6esocket\u4f7f\u5176\u53d8\u4e3anon-blocking\u3002\u5f53\u5bf9\u4e00\u4e2anon-blocking socket\u6267\u884c\u8bfb\u64cd\u4f5c\u65f6\uff0c\u6d41\u7a0b\u662f\u8fd9\u4e2a\u6837\u5b50\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/wps43.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/wps43.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u5f53\u7528\u6237\u8fdb\u7a0b\u53d1\u51faread\u64cd\u4f5c\u65f6\uff0c\u5982\u679ckernel\u4e2d\u7684\u6570\u636e\u8fd8\u6ca1\u6709\u51c6\u5907\u597d\uff0c\u90a3\u4e48\u5b83\u5e76\u4e0d\u4f1ablock\u7528\u6237\u8fdb\u7a0b\uff0c\u800c\u662f\u7acb\u523b\u8fd4\u56de\u4e00\u4e2aerror\u3002\u4ece\u7528\u6237\u8fdb\u7a0b\u89d2\u5ea6\u8bb2 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href=\"https:\/\/egonlin.com\/wp-login.php?action=register\">Register<\/a><\/div><div id=\"Link1\"><a href=\"https:\/\/egonlin.com\/wp-login.php?action=lostpassword\">Forgotten username or password?<\/a><\/div><div id=\"StatusBarFooter\"><\/div><\/div><\/div><div id=aru_remaining_content><\/div>","protected":false},"excerpt":{"rendered":"<p>IO\u6a21\u578b \u4e00\u3001\u524d\u5e8f\u77e5\u8bc6\u56de\u987e \u4e3a\u4e86\u66f4\u597d\u5730\u4e86\u89e3IO\u6a21\u578b\uff0c\u6211\u4eec\u9700\u8981\u4e8b\u5148\u56de\u987e\u4e0b\uff1a\u540c\u6b65\u3001\u5f02\u6b65\u3001\u963b\u585e\u3001\u975e\u963b\u585e\u3002 1\u3001\u540c\u6b65  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