Timer coalescing
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Operating system feature to reduce CPU idle time
Timer coalescing is a computer system energy-saving technique that reduces central processing unit (CPU) power consumption by reducing the precision of software timers used for synchronization of process wake-ups, minimizing the number of times the CPU is forced to perform the relatively power-costly operation of entering and exiting idle states.[1]
Implementations of timer coalescing
[edit ]- The Linux kernel gained support for deferrable timers in 2.6.22,[2] [3] and controllable "timer slack" for threads in 2.6.28 allowing timer coalescing.[4] [5]
- Timer coalescing has been a feature of Microsoft Windows from Windows 7 onward.[6]
- Apple's XNU kernel based OS X gained support as of OS X Mavericks.[7] [8]
- FreeBSD supports it since September 2010.[9]
See also
[edit ]References
[edit ]- ^ Anderson, Nate (June 11, 2013). "How OS X "Mavericks" works its power-saving magic". Ars Technica . Retrieved 2014年03月22日.
- ^ "Linux Kernel 2 6 22". kernelnewbies.org. Retrieved 2014年03月22日.
- ^ "Add support for deferrable timers". 2007年05月08日. Retrieved 2014年03月22日.
- ^ "time(7) - Linux manual page". Man7.org. Retrieved 2014年03月24日.
- ^ "prctl(2) - Linux manual page". Man7.org. Retrieved 2014年03月24日.
- ^ "Windows Timer Coalescing". Microsoft. January 20, 2009. Retrieved 2009年04月21日.
- ^ "OS X Mavericks - Advanced Technologies". Apple Inc. Retrieved 2014年03月22日.
- ^ "OS X Mavericks: Core Technologies Overview" (PDF). Apple, Inc. June 10, 2013. Archived from the original (PDF) on June 26, 2013. Retrieved 2013年06月10日.
- ^ "Refactor timer management code". 13 September 2010.
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