PrimeGrid
Please visit donation page to help the project cover running costs for this month

Toggle Menu

Join PrimeGrid

Returning Participants

Community

Leader Boards

Results

Other

drummers-lowrise

Advanced search

Message boards : Number crunching : Unfavourable Tasks when running multiple (2) GPUs

Author Message
archeye
Send message
Joined: 16 Jan 13
Posts: 6
ID: 189852
Credit: 1,780,674
RAC: 10
Cullen LLR Bronze: Earned 10,000 credits (18,092)Woodall LLR Bronze: Earned 10,000 credits (37,607)GFN Amethyst: Earned 1,000,000 credits (1,712,534)
Message 131381 - Posted: 22 Jul 2019 | 19:19:48 UTC

I have a Windows 10 64 PC and 2 GPUs.

Just recently I received 2 large tasks which is fine but there is a problem.

For some reason these 2 tasks do not play good with TThrottle.

I can run each independently and the Throttle is 50% with nothing running on the second GPU.

When I run both together or even one with a Collatz GPU task then the Throttle goes up to 99% very quickly.

In other projects I can comfortably run 2 GPU tasks without any issue.

I think there must be something special in the way these tasks run on windows that causes Throttle to misbehave.

I did inquire to the author about Throttle and 2 GPUs and within his reply he said,

"As it can't throttle the actual GPU it slows down the feeder CPU process."

Does anyone have a workaround for this. I Use Nvidia 980 cards.

Primegrid is not a new project and I find it hard to believe this is a new problem but after reading through the forum I could not find anything that helped.

I am happy to support but do lack a little in the expertise ;)

Thanks.

Here is the example of the 2 tasks,



Here is the image showing when 1 (large) Primegrid task runs the Throttle is 50% (it is the same, 50% Throttle, when I choose either of the Primegrid tasks shown in the first image).

Profile AzmodesProject donor
Avatar
Send message
Joined: 30 Dec 16
Posts: 162
ID: 479275
Credit: 1,317,168,827
RAC: 430,440
Discovered 1 mega primeDiscovered 1 AP26Found 2 primes in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 1 mega prime in the 2019 Tour de Primes321 LLR Silver: Earned 100,000 credits (408,628)Cullen LLR Bronze: Earned 10,000 credits (29,920)ESP LLR Bronze: Earned 10,000 credits (30,791)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (33,221)PPS LLR Turquoise: Earned 5,000,000 credits (5,008,633)PSP LLR Ruby: Earned 2,000,000 credits (3,847,255)SoB LLR Jade: Earned 10,000,000 credits (10,194,347)SR5 LLR Amethyst: Earned 1,000,000 credits (1,783,647)SGS LLR Gold: Earned 500,000 credits (621,613)TRP LLR Bronze: Earned 10,000 credits (71,189)Woodall LLR Gold: Earned 500,000 credits (524,564)321 Sieve Amethyst: Earned 1,000,000 credits (1,445,427)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (28,919,526)PPS Sieve Double Silver: Earned 200,000,000 credits (241,811,943)TRP Sieve (suspended) Bronze: Earned 10,000 credits (39,046)AP 26/27 Emerald: Earned 50,000,000 credits (79,517,724)GFN Double Bronze: Earned 100,000,000 credits (102,186,167)PSA Double Gold: Earned 500,000,000 credits (840,695,185)
Message 131403 - Posted: 23 Jul 2019 | 10:27:46 UTC

What throttling temp did you set on the GPU? Seems it's quite low if it's already kicking in at <70C. These higher n GFN tasks are very demanding on the GPU, so it will be considerably hotter than with a lot of other projects. And of course more so if you have two cards in the same system.
____________
Long live the sievers.

Post to thread

Message boards : Number crunching : Unfavourable Tasks when running multiple (2) GPUs

[Return to PrimeGrid main page]
DNS Powered by DNSEXIT.COM
Copyright © 2005 - 2019 Rytis Slatkevičius (contact) and PrimeGrid community. Server load 1.13, 1.29, 1.54
Generated 14 Nov 2019 | 7:33:58 UTC