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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Scheduler activations ： ウィキペディア英語版 Scheduler activations Scheduler Activations is a threading mechanism that, when implemented in an operating system's process scheduler, provides kernel-level thread functionality with user-level thread flexibility and performance. This mechanism uses a so-called "N:M" strategy that maps some N number of application threads onto some M number of kernel entities, or "virtual processors." This is a compromise between kernel-level ("1:1") and user-level ("N:1") threading. In general, "N:M" threading systems are more complex to implement than either kernel or user threads, because both changes to kernel and user-space code are required. Scheduler Activations was proposed by Anderson, Bershad, Lazowska, and Levy in (Scheduler Activations: Effective Kernel Support for the User-Level Management of Parallelism ) in 1991. It was implemented in the NetBSD kernel by Nathan Williams〔(An Implementation of Scheduler Activations on the NetBSD Operating System )〕 but has since been abandoned in favor of 1:1 threading.〔(Significant changes from NetBSD 4.0 to 5.0 )〕 FreeBSD had a similar threading implementation called Kernel Scheduled Entities which is also being retired in favor of 1:1 threading. Scheduler activations were also implemented as a patch for the Linux kernel by Vincent Danjean: (Linux Activations ), the user-level part being done in the (Marcel thread library ). ==References== 〔 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「Scheduler activations」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.