Timer coalescing

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

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]

References

^ Anderson, Nate (June 11, 2013). "How OS X "Mavericks" works its power-saving magic". Ars Technica. Retrieved 2014-03-22.
^ "Linux Kernel 2 6 22". kernelnewbies.org. Retrieved 2014-03-22.
^ "Add support for deferrable timers". 2007-05-08. Retrieved 2014-03-22.
^ "time(7) - Linux manual page". Man7.org. Retrieved 2014-03-24.
^ "prctl(2) - Linux manual page". Man7.org. Retrieved 2014-03-24.
^ "Windows Timer Coalescing". Microsoft. January 20, 2009. Retrieved 2009-04-21.
^ "OS X Mavericks - Advanced Technologies". Apple Inc. Retrieved 2014-03-22.
^ "OS X Mavericks: Core Technologies Overview" (PDF). Apple, Inc. June 10, 2013. Archived from the original (PDF) on June 26, 2013. Retrieved 2013-06-10.
^ "Refactor timer management code". 13 September 2010.

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[ars_technica_os_x-1] Anderson, Nate (June 11, 2013). "How OS X "Mavericks" works its power-saving magic". Ars Technica. Retrieved 2014-03-22.

[k_newb-2] "Linux Kernel 2 6 22". kernelnewbies.org. Retrieved 2014-03-22.

[git_commit-3] "Add support for deferrable timers". 2007-05-08. Retrieved 2014-03-22.

[man_page:_time-4] "time(7) - Linux manual page". Man7.org. Retrieved 2014-03-24.

[man_page:_prctl-5] "prctl(2) - Linux manual page". Man7.org. Retrieved 2014-03-24.

[6] "Windows Timer Coalescing". Microsoft. January 20, 2009. Retrieved 2009-04-21.

[Advanced_Technologies-7] "OS X Mavericks - Advanced Technologies". Apple Inc. Retrieved 2014-03-22.

[OS_X_Mavericks:_Core_Technologies_Overview-8] "OS X Mavericks: Core Technologies Overview" (PDF). Apple, Inc. June 10, 2013. Archived from the original (PDF) on June 26, 2013. Retrieved 2013-06-10.

[9] "Refactor timer management code". 13 September 2010.

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Timer coalescing

Timer coalescing

Timer coalescing

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Timer coalescing

Implementations of timer coalescing

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References