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{{Short description|Operating system feature to reduce CPU idle time}}
'''Timer coalescing''' is a computer system [[power management|energy-saving]] technique that reduces [[central processing unit]] (CPU) power consumption by reducing the precision of [[software timer]]s to allow the 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 (CPU)|idle states]].<ref name=ars_technica_os_x/>
'''Timer coalescing''' is a computer system [[power management|energy-saving]] technique that reduces [[central processing unit]] (CPU) power consumption by reducing the precision of [[software timer]]s 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 (CPU)|idle states]].<ref name=ars_technica_os_x/>


== Implementations of timer coalescing ==
*The [[Linux kernel]] gained support for deferrable timers in 2.6.22,<ref name=k_newb/><ref name=git_commit/> and controllable "timer slack" for [[thread (computing)|thread]]s in 2.6.28 allowing timer coalescing.<ref name="man page: time"/><ref name="man page: prctl"/>
*The [[Linux kernel]] gained support for deferrable timers in 2.6.22,<ref name=k_newb/><ref name=git_commit/> and controllable "timer slack" for [[thread (computing)|thread]]s in 2.6.28 allowing timer coalescing.<ref name="man page: time"/><ref name="man page: prctl"/>
*Timer coalescing has been a feature of [[Microsoft Windows]] from [[Windows 7]] onward.<ref>{{cite web
*Timer coalescing has been a feature of [[Microsoft Windows]] from [[Windows 7]] onward.<ref>{{cite web
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}}</ref>
}}</ref>
*[[Apple Inc.|Apple]]'s [[XNU]] kernel based [[OS X]] gained support as of [[OS X Mavericks]].<ref name="Advanced Technologies"/><ref name="OS X Mavericks: Core Technologies Overview"/>
*[[Apple Inc.|Apple]]'s [[XNU]] kernel based [[OS X]] gained support as of [[OS X Mavericks]].<ref name="Advanced Technologies"/><ref name="OS X Mavericks: Core Technologies Overview"/>
*[[FreeBSD]] supports it since September 2010.<ref>{{cite web|url=https://lists.freebsd.org/pipermail/svn-src-all/2010-September/028792.html
|title=Refactor timer management code
|date=13 September 2010
}}</ref>


== See also ==
== See also ==
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* [[HLT (x86 instruction)]]
* [[HLT (x86 instruction)]]
* [[Interrupt coalescing]]
* [[Interrupt coalescing]]
* [[Interrupt service routine]]
* [[Low-power electronics]]
* [[Performance per watt]]
* [[Programmable interval timer]]
* [[Programmable interval timer]]
* [[Real-time clock]] (RTC)
* [[System clock]]
* [[Time Stamp Counter]] (TSC)
* [[Time Stamp Counter]] (TSC)
* [[Tickless kernel]]
{{Div col end}}
{{Div col end}}


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<ref name=ars_technica_os_x>
<ref name=ars_technica_os_x>
{{cite web | url = https://arstechnica.com/apple/2013/06/how-os-x-mavericks-works-its-power-saving-magic/
{{cite web | url = https://arstechnica.com/apple/2013/06/how-os-x-mavericks-works-its-power-saving-magic/
| title = How OS X “Mavericks” works its power-saving magic | author = Anderson, Nate | publisher = [[Ars Technica]]
| title = How OS X "Mavericks" works its power-saving magic | author = Anderson, Nate | publisher = [[Ars Technica]]
| date = June 11, 2013 | accessdate=2014-03-22}}</ref>
| date = June 11, 2013 | accessdate=2014-03-22}}</ref>
<ref name=git_commit>
<ref name=git_commit>
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{{cite web|url=http://kernelnewbies.org/Linux_2_6_22|title=Linux Kernel 2 6 22|publisher=kernelnewbies.org|accessdate=2014-03-22}}</ref>
{{cite web|url=http://kernelnewbies.org/Linux_2_6_22|title=Linux Kernel 2 6 22|publisher=kernelnewbies.org|accessdate=2014-03-22}}</ref>
<ref name="Advanced Technologies">
<ref name="Advanced Technologies">
{{cite web|url=http://www.apple.com/osx/preview/advanced-technologies.html|title=OS X Mavericks - Advanced Technologies
{{cite web|url=https://www.apple.com/osx/preview/advanced-technologies.html|title=OS X Mavericks - Advanced Technologies
|publisher=Apple Inc.|accessdate=2014-03-22}}</ref>
|publisher=Apple Inc.|accessdate=2014-03-22}}</ref>
<ref name="OS X Mavericks: Core Technologies Overview">
<ref name="OS X Mavericks: Core Technologies Overview">
{{cite web | title=OS X Mavericks: Core Technologies Overview
{{cite web
|title = OS X Mavericks: Core Technologies Overview
| url=http://images.apple.com/osx/preview/docs/OSX_Mavericks_Core_Technology_Overview.pdf | publisher=Apple, Inc.
|url = https://images.apple.com/osx/preview/docs/OSX_Mavericks_Core_Technology_Overview.pdf
|publisher = Apple, Inc.
| date=June 10, 2013 | accessdate=2013-06-10}}</ref>
|date = June 10, 2013
|accessdate = 2013-06-10
|url-status = dead
|archiveurl = https://web.archive.org/web/20130626042313/http://images.apple.com/osx/preview/docs/OSX_Mavericks_Core_Technology_Overview.pdf
|archivedate = June 26, 2013
}}</ref>
<ref name="man page: time">{{cite web|url=http://man7.org/linux/man-pages/man7/time.7.html |title=time(7) - Linux manual page |publisher=Man7.org |date= |accessdate=2014-03-24}}</ref>
<ref name="man page: time">{{cite web|url=http://man7.org/linux/man-pages/man7/time.7.html |title=time(7) - Linux manual page |publisher=Man7.org |date= |accessdate=2014-03-24}}</ref>
<ref name="man page: prctl">{{cite web|url=http://man7.org/linux/man-pages/man2/prctl.2.html |title=prctl(2) - Linux manual page |publisher=Man7.org |date= |accessdate=2014-03-24}}</ref>
<ref name="man page: prctl">{{cite web|url=http://man7.org/linux/man-pages/man2/prctl.2.html |title=prctl(2) - Linux manual page |publisher=Man7.org |date= |accessdate=2014-03-24}}</ref>
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{{compsci-stub}}
{{compsci-stub}}
[[Category:Operating system kernels]]

[[Category:Synchronization]]
[[Category:Synchronization]]

Latest revision as of 03:00, 27 March 2023

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]

See also

[edit]

References

[edit]
  1. ^ Anderson, Nate (June 11, 2013). "How OS X "Mavericks" works its power-saving magic". Ars Technica. Retrieved 2014-03-22.
  2. ^ "Linux Kernel 2 6 22". kernelnewbies.org. Retrieved 2014-03-22.
  3. ^ "Add support for deferrable timers". 2007-05-08. Retrieved 2014-03-22.
  4. ^ "time(7) - Linux manual page". Man7.org. Retrieved 2014-03-24.
  5. ^ "prctl(2) - Linux manual page". Man7.org. Retrieved 2014-03-24.
  6. ^ "Windows Timer Coalescing". Microsoft. January 20, 2009. Retrieved 2009-04-21.
  7. ^ "OS X Mavericks - Advanced Technologies". Apple Inc. Retrieved 2014-03-22.
  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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