Strange Calculation Behaviour

Message boards : Graphics cards (GPUs) : Strange Calculation Behaviour

Author	Message
[AF>Amis des Lapins] Phil... Send message Joined: 16 Jul 13 Posts: 56 Credit: 1,626,354,890 RAC: 0 Level Scientific publications	Message 34225 - Posted: 12 Dec 2013 \| 6:25:28 UTC
	Hello ! I am currently running 77x-SANTI_MARwtcap310-1-32-RND1129_0 Unité de travail (WU) 4985773. First time I see this, but the GPU charge (graph) is sinusoidal. Instead of being stable at 98 % or 99 % : X seconds at 50 % or less, followed by Y seconds at 99 % etc => after 13 hours on a GTX660Ti : 91 % only, while this card normally takes between 10 up to 12 hours to completed long runs. Any idea about the origin of this "strange" behaviour ? Thank You, Kind Regards, Philippe
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skgiven Volunteer moderator Volunteer tester Send message Joined: 23 Apr 09 Posts: 3968 Credit: 1,995,359,260 RAC: 0 Level Scientific publications	Message 34257 - Posted: 12 Dec 2013 \| 19:29:46 UTC - in response to Message 34225.
	If by 'charge' you mean power then it should be linear or very close to it. If it's a square-toothed graph then it's likely that something else is interfering with GPU crunching, the GPU itself, or there might be something wrong with the WU. Sinusoidal, as in sine wave (http://people.sc.fsu.edu/~jburkardt/latex/svd_2006_vt/inout_flow_sinusoid.png) would be very odd! What software are you using to view the graph? What else are you crunching and what Boinc settings are you using? ____________ FAQ's HOW TO: - Opt out of Beta Tests - Ask for Help
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[AF>Amis des Lapins] Phil... Send message Joined: 16 Jul 13 Posts: 56 Credit: 1,626,354,890 RAC: 0 Level Scientific publications	Message 34292 - Posted: 14 Dec 2013 \| 11:00:16 UTC - in response to Message 34257. Last modified: 14 Dec 2013 \| 11:01:59 UTC
	Thank you for your message. After a reboot, thinks look fine now. However, this UT took much more time to complete ... (WU) 4985773 http://www.gpugrid.net/result.php?resultid=7540482 Yes, the GPU charge indicator (EVGA Precision X) showed a sinusoidal use i/o linear ... Made neither change to the PC nor to BOINC ... Posted this message as this was the first time I saw such behaviour ... GPU = GTX660Ti - PNY Again, Thank You Kind Regards Philippe
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Dagorath Send message Joined: 16 Mar 11 Posts: 509 Credit: 179,005,236 RAC: 0 Level Scientific publications	Message 34294 - Posted: 14 Dec 2013 \| 11:45:32 UTC - in response to Message 34292.
	I think by GPU charge he means GPU utilization rather than something electrical. My French is not very good but I think charge can mean something like usage or utilization in French. ____________ BOINC <<--- credit whores, pedants, alien hunters
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VT Send message Joined: 28 Nov 13 Posts: 17 Credit: 153,786,987 RAC: 0 Level Scientific publications	Message 34340 - Posted: 16 Dec 2013 \| 8:11:10 UTC - in response to Message 34294.
	That tool can show a graph of electrical power consumption for the card. Even if clock stays the same(and I really mean the same - no boost or "idle" freq drop), but there is no compute load on the card, the power consumption will drop - seems like a good indicator of how busy the card is at a given moment. That tool also can dynamically boost Memory and compute clocks - if memory load is small, it drops it's clock and can boot compute up to 1058 for Titan (from 836 advertized or 928 "official" boost).
	ID: 34340 \| Rating: 0 \| rate: / Reply Quote

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Message boards : Graphics cards (GPUs) : Strange Calculation Behaviour

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