翻訳と辞書 Words near each other ・ Zero X ・ Zero XU ・ Zero Yen House ・ Zero Zero ・ Zero Zero (band) ・ Zero Zero (comics) ・ Zero Zero Zero ・ Zero's Subs ・ Zero, Mississippi ・ Zero, Montana ・ Zero-Acquaintance Personality Judgments ・ Zero-based budgeting ・ Zero-based numbering ・ Zero-carbon city ・ Zero-configuration networking ・ Zero-copy ・ Zero-coupon bond ・ Zero-Coupon Inflation-Indexed Swap ・ Zero-crossing rate ・ Zero-curtain effect ・ Zero-day (computing) ・ Zero-defects mentality ・ Zero-dimensional space ・ Zero-dispersion wavelength ・ Zero-drag satellite ・ Zero-emissions vehicle ・ Zero-energy building ・ Zero-energy universe ・ Zero-Force Evolutionary Law ・ Zero-forcing precoding Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Zero-copy ： ウィキペディア英語版 Zero-copy "Zero-copy" describes computer operations in which the CPU does not perform the task of copying data from one memory area to another. This is frequently used to save CPU cycles and memory bandwidth when transmitting a file over a network.〔(Zero Copy I: User-Mode Perspective in Linux Journal - January 1, 2003 )〕 == Principle == Zero-copy versions of operating system elements, such as device drivers, file systems, and network protocol stacks, greatly increase the performance of certain application programs and more efficiently utilize system resources. Performance is enhanced by allowing the CPU to move on to other tasks while data copies proceed in parallel in another part of the machine. Also, zero-copy operations reduce the number of time-consuming mode switches between user space and kernel space. System resources are utilized more efficiently since using a sophisticated CPU to perform extensive copy operations, which is a relatively simple task, is wasteful if other simpler system components can do the copying. As an example, reading a file and then sending it over a network the traditional way requires two data copies and two context switches per read/write cycle. One of those data copies use the CPU. Sending the same file via zero copy reduces the context switches to two and eliminates all CPU data copies.〔 Zero-copy protocols are especially important for high-speed networks in which the capacity of a network link approaches or exceeds the CPU's processing capacity. In such a case the CPU spends nearly all of its time copying transferred data, and thus becomes a bottleneck which limits the communication rate to below the link's capacity. A rule of thumb used in the industry is that roughly one CPU clock cycle is needed to process one bit of incoming data. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Zero-copy」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.