WearepleasedtoannouncethereleaseofPowerTOPv2.0whichconcludesamajoroverhaulofthecodebase,andaddsexcitingnewfeatures.
*About PowerTOP*
PowerTOP is a Linux tool to diagnose issues with power consumption and
power management. In addition to being a diagnostic tool, PowerTOP also
has an interactive mode whereyou can experiment with various power
management settings for cases where the Linux distribution has not
enabled those settings.
PowerTOP reports which components in the system are most likely to blame
for a higher-than-needed power consumption, ranging from software
applications to active components in the system. Detailed screens are
available for CPU C and P states, device activity, and software activity.
For many years, PowerTOP has been used heavily by Intel, Linux
distributors, and various parts of the open source community. We're
hoping that our users find the second generation even more useful for
their needs.
*Highlights*
*
GreatlyenhanceddiagnosticcapabilitiesusingtheLinuxkernelperfframework
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Newtab-basedUIwhichdisplaysmoredetailedinformationinrealtime
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Advanced reporting capabilities for offline analysis including HTML5
and CSV formats.
*Release****Details*
PowerTOPv2.0hasfourmajorthoughttracks:
1.
Keep the integrity of PowerTOP v1.x, but update it to be equally
relevant to its growing user base.
2.
Take the interests from our user base, such as the need and want for
greater reportability, and more tunables information.
3.
Keep PowerTOP moving forward with changes to the Linux kernel, such
as the depreciation of power trace events, like power_frequency
starting in Linux kernel version 3.0.
4.
Make sure PowerTOP was updated with emerging Intel Architecture,
such as the newer Ivy Bridge chipset.
Version2.0hasseveralnewkeyfeaturesandupdates.Thefirstbigchangeistheuseofahardenedlibrarycalledlibparseevents,foraccessingthekernel"perf"infrastructure.Withthisenhancement,weareabletoprovidemuchmoreaccuratedata,andbemoreflexiblewithanyfuturekerneldevelopment.TherehasbeenagreatdealofworkdoneintheareaofCPUdatameasurementanddiagnostics.FullaccuratesupportwasaddedforCPUidle,frequency,andpowertraces,alongwithexpandedfrequencystatereportingforCPUswithmorethan10states.Withtheseadditions,PowerTOPv2.0nowgivesaclearerpictureofhowprogramsaffectCPUutilization,andtheimpactonimportantpower-savingsleepstates.
PowerTOPv2.0alsoincludesotherkeyadvances,suchassystemdevicestracking,whichgivesyouclearinformationonwhichdevices(ifany)areproblematicintermsofpowerbehavior,GPUactivitymeasurements,andVFSoptsactivitymeasurements.ThisallowsPowerTOPv2.0usersamorecompleteoverviewofthesystem.
In addition to the new features, several enhancements have been made in
these areas:
*
IncreasedWLANsupport—PowerTOPnowsupportsmultipleWLANinterfaces
*
Enhanced i915 driver support
*
Morerobustbatterydataacquisition
*
Real time measurement support for USB hot-plug.
Withalltheenhancementsandadditions,therehasalsobeenextensiveworkonPowerTOPreports.Reportinghasbeenhighlightedtimeandtimeagainasamuchneededanddesiredenhancement.Toaddressallthereportingneedsofourusers,PowerTOPv2.0nowrunsintwomodes:interactiveandnoninteractive.Thisgivesyoutworepresentationsofthedata:staticandinteractivereal-time.
Ininteractivemode,PowerTOPv2.0isenhancedwitharedesigned,tab-baseduserinterfacewithfullon-demandwindowrefreshsupport.ThisnewUIgivesyouaclean,organized,real-timewaytovisualizeandanalyzeeffectsonpower.Dataisnowdisplayedandorganizedintotabs:
*
*Overview****Tab:*detailsthesummaryinformationabouttotalCPUandwakeupspersecondfortheSystem,GPU,andVFSops.Withinthesummaryview,youalsoseetheconsumerstatusforinterrupts,devices,timers,processes,andmore.
*
*Idle****stats****tab:*detailsthesummaryinformationonthevariousprocessorcores,andthestatusoftheprocessorpackage.
*
*Frequency****stats****tab:*detailsthesummaryinformationabouttheclockspeeds,andthepercentageusedinsaidclocks,foreachprocessorcoreandpackage.
*
*Device****stats****tab:***detailsthesummarydeviceactivityoverview,networkdevicetransmissionrates,andGPUopsrates.
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*Tunables****tab:*summarizesourbestknowndiagnosticrecommendationsandoptionstoapply.Thistabisalsointeractivewiththeabilityofallowingyoutotoggletheoptionswhileininteractivemode.Soinrealtime,youcanseewhataffectPowerTOP’srecommendationswillhaveonpower.
Inthenon-interactivemode(akareportingmode),therehasbeenamajoroverhaulinthoughtandfunctionality.PowerTOPv2.0nowallowsyoutospecifynotonlythedurationofeachtestmeasurementcycle,butthenumberofiterationstomeasure.Dependingonyourneeds,PowerTOPv2.0nowproducestwodifferentreportformats:HTMLandCSV.
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*HTML:*TheHTMLreportcontainsalltheinformationseenintherealtimeUI,butinasinglestaticreport.Additionally,wearehappytosaythatPowerTOP’sHTMLreportsarealsoinanHTML5applicationformat,givinganyuserwithanHTML5-supportedbrowseraclean,organizedtab-basedreport.Asniceasthisisforreviewingdata,thereisalsotheALLtabintheHTML5applicationthatpresentsallthedatainonelongformatforthetotalpicture.ThisisalsothestandardformatforHTMLreportsgeneratedfornon-HTML5browsers.Toclosethegapinyourwantsandneeds,PowerTOPv2.0nowreportsthetunablerecommendations.AlthoughPowerTOPisnotapermanenttuningtool,PowerTOPindeedhastheabilitytotestthetunableeffectsofitssuggestions.Assuch,itwasonlyreasonablethatweincludethesetunablesinthereport.
*
*CSV:*TheCSVreportisasingle,static,comma-separated,value-delimitedreport,givingyouultimatecontrolfordatamanipulationforyourspecificneeds,suchastrendingandanalyticalanalysis.
*Project Details*
Fromaprojectpointofview,therehasbeenseveralchanges.PowerTOPv2.0hasnowbeenautotooledtosupportandincreaseportability.ThereisalsolimitedAndroidmakesupport,whichwascompletedandspearheadedbycommunitymembers.
WearealsoexcitedtoannouncethatthePowerTOPprojectwillhaveanewhomeon01.org.Thiswillbethesinglepointforreleases,blogs,andinformationonPowerTOPmovingforward.Inourmoveto01.org,wewillalsobemovingandconsolidatingthecurrentemaillists.Althoughthisisahassle,itisimportanttoconsolidatethecurrentwebsite,andthetwomailinglists,usedforPowerTOP,totheirnewhomeon01.org.
*
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*
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*
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*
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*
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*Note:***Wewillnotuseanyoftheintegrate,merge,ortrackingfunctionsofGitHub,sopleasecontinuetousetheprovidedlists.
*Our****thanks*
For this release, we would like to give a special thanks to the
following contributors, and all contributors to PowerTOP. Not in any
particular order:
Sergey Senozhatsky, Márton Németh, Mike Frysinger, John Mathew, Thomas
Spura, Henry Gebhardt, Jaroslav Škarvada, Anssi Hannula, Jan Kaluža,
Kristen Carlson Accardi, Mikel Olasagasti Uranga, Jussi Kukkonen.
*What**’**s****Next*
Movingforward,youcanexpectmoregreatchanges,andmoreinteractivity.Wehaveplans,ideas,andanewlyrestoredvigortowardsPowerTOP.Wewillbeplanningiterativereleases,givingblogupdates,andtalkingcontributions,notonlyincode,butQA,documentation,andfunctionalsuggestions(especiallyifthesubmitteriswillingtoalsocodeonhis/herfunctionalsuggestions).Wedon’thavealotofdedicatedresources,butwenowhavemorethenwe’veeverhadbefore.
Currentv2.1goalsunderconsiderationare:
*
LocalizationoftheUIintoapproximately10to20languages
*
ContinuedimprovementstotheUI,includingresolutionscaling
*
Continued support of emerging Intel Architecture
*
ContinuedsupportofemergingKerneldevelopment
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