?!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> title_temp 软g开发中多核时代对ƈ发程序设计的探烦-日照临沂APP软g开发公?/title> <meta name="keywords" content="" /> <meta name="description" content="澶氭牳鏃朵唬宸茬粡鍒版潵锛屽绾跨▼鍜屽紓姝ユ搷浣滅瓑骞跺彂绋嬪簭璁捐鏂规硶涔熷彈鍒颁簡鏇村鐨勫叧娉ㄥ拰璁ㄨ銆傛棩鐓ц蒋浠跺紑鍙戞兂灏卞浣曚娇鐢ㄥ苟鍙戞潵鏈€澶у寲绋嬪簭鐨勬€ц兘鍜屽ぇ瀹舵帰璁ㄤ竴涓嬨€傚绾跨▼鍜屽紓姝ユ搷浣滅殑寮傚悓澶氱嚎绋嬪拰寮傛鎿嶄綔涓よ€呴兘鍙互杈惧埌閬垮厤璋冪敤绾? /> <link href="/css/style.css" type="text/css" rel="stylesheet"> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <h1><a href="http://mirz-jiles.net/">¾</a></h1> <div id="header"> <div id="qfc8qvhy30qkb" class="header"> <div id="qfc8qvhy30qkb" class="head01"><a target="_blank" href="http://wpa.qq.com/msgrd?v=3&uin=1069706080&site=qq&menu=yes"><img src="http://wpa.qq.com/pa? p=1:1069706080:4" border="0" alt="在线客服" />1069706080</a> |<a href="/html/sitemap.xml">XML</a> | <a href="/html/help.html">HTML</a> | <a href="/sitemap.txt">TXT</a></div> <div 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class="article_author">文章来源Q?a href="/">临沂软g开?/a> d旉Q?016-6-20 16:35:58 览人数Q?Script Language="Javascript" Src="/item/GetHits.asp?Action=Count&GetFlag=0&m=1&ID=4512"></Script></div> <div id="qfc8qvhy30qkb" class="article_main"> <div id="MyContent"><span style="font-size:14px">  多核时代已经到来Q多U程和异步操作等q发E序设计Ҏ也受C更多的关注和讨论?a href="http://decepti0n.top/"><strong>日照软g开?/strong></a>惛_如何使用q发来最大化E序的性能和大家探讨一下?br />   多线E和异步操作的异?br />   多线E和异步操作两者都可以辑ֈ避免调用U程d的目的,从而提高Y件的可响应性。甚x些时候我们就认ؓ多线E和异步操作是等同的概念。但是,多线E和异步操作q是有一些区别的。而这些区别造成了用多U程和异步操作的时机的区别?br />   异步操作的本?br />   所有的E序最l都会由计算机硬件来执行Q所以ؓ了更好的理解异步操作的本质,我们有必要了解一下它的硬件基?熟悉电脑g的朋友肯定对DMAq个词不陌生Q硬盘、光q技术规g都有明确DMA的模式指标,其实|卡、声卡、显卡也是有DMA功能的。DMA是直接内存讉K的意思,也就是说Q拥有DMA功能的硬件在和内存进行数据交换的时候可以不消耗CPU资源。只要CPU在发h据传输时发送一个指令,g开始自己和内存交换数据Q在传输完成之后g会触发一个中断来通知操作完成。这些无L耗CPU旉的I/O操作正是异步操作的硬件基。所以即使在DOSq样的单q程Q而且无线E概念)pȝ中也同样可以发v异步的DMA操作?br />   U程的本?br />   U程不是一个计机g的功能,而是操作pȝ提供的一U逻辑功能Q线E本质上是进E中一Dƈ发运行的代码Q所以线E需要操作系l投入CPU资源来运行和调度?br />   异步操作的优~点<br />   因ؓ异步操作无须额外的线E负担,q且使用回调的方式进行处理,在设计良好的情况下,处理函数可以不必使用׃n变量Q即使无法完全不用,最L可以减少׃n变量的数量)Q减了死锁的可能。当然异步操作也q完美无暇。编写异步操作的复杂E度较高Q程序主要用回调方式进行处理,与普通h的思维方式有些初入Q而且难以调试?br />   多线E的优缺?br />   多线E的优点很明显,U程中的处理E序依然是顺序执行,W合普通h的思维习惯Q所以编E简单。但是多U程的缺点也同样明显Q线E的使用Q滥用)会给pȝ带来上下文切换的额外负担。ƈ且线E间的共享变量可能造成死锁的出现?br />   适用范围<br />   在了解了U程与异步操作各自的优缺点之后,我们可以来探讨一下线E和异步的合理用途。我认ؓQ当需要执行I/O操作Ӟ使用异步操作比用线E?同步I/O操作更合适。I/O操作不仅包括了直接的文g、网l的dQ还包括数据库操作、Web Service、HttpRequest以及。net Remoting{跨q程的调用?br />   而线E的适用范围则是那种需要长旉CPUq算的场合,例如耗时较长的图形处理和法执行。但是往往׃使用U程~程的简单和W合习惯Q所以很多朋友往往会用线E来执行耗时较长的I/O操作。这样在只有数几个q发操作的时候还无伤大雅Q如果需要处理大量的q发操作时就不合适了?br />   随着信息技术的发展Q多核时代在未来一定会有更好的发展?/span></div> <p style="padding-top:16px;text-indent: 24px; ">惌了解更多详情Ƣ迎来电咨询18678812288Q或登陆|址<A href="/">mirz-jiles.net</a>。联pMhQ王l理?/p> </div> </div> <div id="qfc8qvhy30qkb" class="main04"> <div id="qfc8qvhy30qkb" class="m4_tit"><a href="/xwdt/">新闻中心</a></div> <ul class="m4_main"> <li> <h2><A href="/xwdt/xyzx/">更多+</A><i>软g开发行业资?/i></h2> <div id="qfc8qvhy30qkb" class="syxwlb"> 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