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Thread: CPU Usage - lots of spikes |
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Thread Status: Active Total posts in this thread: 34
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wcgridmember
Advanced Cruncher Joined: Mar 30, 2005 Post Count: 112 Status: Offline Project Badges: 
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I use 50% of CPU time on 50% of the threads on three fairly recent laptops (one core i7 and two core i5).
----------------------------------------When I look at the CPU usage, I see lots of spikes and the clock is continuously varying (I guess because of the feature of the CPU that overclocks itself automatically to finish tasks faster). Is this ok? Should I disable the automatic overclocking the CPU performs to avoid overheating? Thank you for your time! [Edit 1 times, last edit by wcgridmember at Jul 16, 2016 6:57:43 PM] |
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SekeRob
Master Cruncher Joined: Jan 7, 2013 Post Count: 2741 Status: Offline |
50% is the best setting to prevent fan revving on and off. Does the clock speed go up when computing is in pause phase or when in computing phase?
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wcgridmember
Advanced Cruncher Joined: Mar 30, 2005 Post Count: 112 Status: Offline Project Badges:
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In one of the laptops,
that has a 2.6GHz (dual-core w Hyperthreading) core i5 CPU, the higher the CPU usage in the Graph, the higher the value of the clock that is shown. Furthermore: the clock varies around 2.8GHz when Boinc is paused (between 2.71 and 3.12GHz) the clock varies around 3GHz when Boinc is running (between 2.78 and 3.1GHz). |
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SekeRob
Master Cruncher Joined: Jan 7, 2013 Post Count: 2741 Status: Offline |
The CPU is designed to give different peak turbo speeds based on total momentary load, the higher total load (cores), the lower the turbo peak is. CPU Temps also are part of how hi and how long these peaks are sustained.
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AgrFan
Senior Cruncher USA Joined: Apr 17, 2008 Post Count: 397 Status: Offline Project Badges: 
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Try updating "On multiprocessor systems, use at most x% of the processors" to 25% and "Use at most x% CPU time" to 100% under Tools - Computing preferences ... processor usage.
----------------------------------------I run a dual core with these settings set to 50% and 100%. CPU usage stays steady at 50% with no spikes or oscillations.
[Edit 3 times, last edit by AgrFan at Jul 16, 2016 8:11:09 PM] |
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges: 
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You are ok. When running the WCG or other many computers vary their clock speed and voltage on a sub second basis.
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KLiK
Master Cruncher Croatia Joined: Nov 13, 2006 Post Count: 3108 Status: Offline Project Badges:
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use Ttherottle!
----------------------------------------why? your CPU wont have spikes...it will not have 50% of time (cca 12h per day), but will have a whole day... any overheating will be regulated by Tthrottle...by giving less % of CPU per BOINC WU task...you don't overheat, on warm hours you go to 80% of CPU throttling, but still making 100% of time! ;) |
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wcgridmember
Advanced Cruncher Joined: Mar 30, 2005 Post Count: 112 Status: Offline Project Badges:
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What advantage would I have for using Tthrottle if I already limit the CPU usage % on Boinc and the CPU clock and fan are already automatically adjusted by the OS, according to the temperature?
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SekeRob
Master Cruncher Joined: Jan 7, 2013 Post Count: 2741 Status: Offline |
My list of cons for TThrottle on hyperthreaded devices is twice as long as the pros, netting to production potentially dropping to a quarter of what it could be to stay below the targeted temperature ceiling. Tools like ThreadMasterGUI ** and Process Lasso [like TThrottle, only Windows] give much better detail control, and they [TMG for sure] work at the microsecond level whereas TThrottle, because of the way BOINC schedules can only do it at whole second level.... with TThrottle you continue to see considerable up and down due it's latency... but maybe something changed since I stopped using it on my Windows running HT devices, years ago.
----------------------------------------Edit: ** See Community FAQs [Edit 1 times, last edit by SekeRob* at Jul 25, 2016 6:44:44 PM] |
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SekeRob
Master Cruncher Joined: Jan 7, 2013 Post Count: 2741 Status: Offline |
BTW, TMG runs as a service, just as BOINC can be installed to do, so you wont have to be signed in to any session for it to keep your device crunching 'cooler', and it can manage any program/app you specify with individual percentages, so lower taxing science app can be run a little harder, and the heavier [running hotter], a little slower.
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