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Multimedia Class Scheduler Service : ウィキペディア英語版 | Multimedia Class Scheduler Service Multimedia Class Scheduler Service (MMCSS) is a Windows service that allows multimedia applications to get prioritized access to CPU for time-sensitive processing (such as multimedia applications) as well as prioritized disc access to ensure that the process is not starved of data to process. The MMCSS service monitors the CPU load and dynamically adjusts priority so that the application can use as much CPU time as possible without denying CPU to lower priority applications.〔(【引用サイトリンク】 Multimedia Class Scheduler Service )〕 MMCSS uses heuristics to determine the relative priority required for the task the thread is performing and dynamically adjusts priority based on that.〔 A thread must invoke MMCSS explicitly to use its services by calling the AvSetMmMaxThreadCharacteristics() 〔(【引用サイトリンク】 AvSetMmMaxThreadCharacteristics Function (Windows) )〕 or AvSetMmThreadCharacteristics() 〔(【引用サイトリンク】 AvSetMmThreadCharacteristics Function (Windows) )〕 APIs. MMCSS is used by the multimedia applications in Windows Vista, including Windows Media Player and Windows Media Center to provide glitch-free audio playback. ==Problems== This service has been implicated in poor networking performance while multimedia is playing.,〔 (Microsoft responds to Vista network performance issue )〕〔(Sysinternals blog "Vista Multimedia Playback and Network Throughput" )〕 In response to this, Microsoft has included a configurable option 〔(Microsoft Knowledge base article 948066 )〕 in Windows Vista Service Pack 1 and later where users can specify the network throttling index value for the Multimedia Class Scheduling Service so that network performance and audio/video playback quality can be balanced according to how users configure it.
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「Multimedia Class Scheduler Service」の詳細全文を読む
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