Dual GPU system

Questions and Answers : Issue Discussion : Dual GPU system
Message board moderation

To post messages, you must log in.

AuthorMessage
CoolAtchOk

Send message
Joined: 10 Sep 20
Posts: 2
Credit: 1,407,102
RAC: 0
Message 765 - Posted: 8 Nov 2020, 1:30:16 UTC

Hi,
In a dual GPU system (Win10), WU are worked only on the first GPU but the Boinc Manager shows this on the second GPU. In fact, the second GPU has zero load at this moment and the first GPU takes all the load into itself. As a result, the second GPU always rests, and the first GPU works for two.

One WU loads the GPU 2080ti only 20%. This is very small and not effective.
ID: 765 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
pianoman [MLC@Home Admin]
Project administrator
Project developer
Project tester
Project scientist

Send message
Joined: 30 Jun 20
Posts: 462
Credit: 21,406,548
RAC: 0
Message 766 - Posted: 8 Nov 2020, 22:57:09 UTC - in response to Message 765.  

Thanks for the feedback. As of this moment, the app doesn't support using multiple GPUs (well, the brand new linux client I just uploaded two minutes ago should, but the windows client doesn't yet).

As for only 20% usage, as I warned, these current WUs won't stress GPUs too much, but still provide a "net win" over CPU only. WUs coming down the pike will be more demanding on GPUs.

Sit tight, we're still working out GPU support, and thanks for testing!
ID: 766 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
pianoman [MLC@Home Admin]
Project administrator
Project developer
Project tester
Project scientist

Send message
Joined: 30 Jun 20
Posts: 462
Credit: 21,406,548
RAC: 0
Message 772 - Posted: 9 Nov 2020, 8:42:38 UTC

The newest windows app in mldstest (9.75) should support support running separate WUs on multiple GPUs, please give it a try and let me know if it works, as we don't have multi-GPU machines to test with.
ID: 772 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote
CoolAtchOk

Send message
Joined: 10 Sep 20
Posts: 2
Credit: 1,407,102
RAC: 0
Message 782 - Posted: 9 Nov 2020, 19:04:51 UTC - in response to Message 772.  

Hi,
Now WUs work correctly: each of the two GPUs has its own load. In addition, I alternately and together suspended and resumed the work of the GPU. The load was distributed correctly in all experiments.
Thank you for the surprisingly quick fix!
PS. Test computer: Win10 and two identical 2080ti video cards.
ID: 782 · Rating: 0 · rate: Rate + / Rate - Report as offensive     Reply Quote

Questions and Answers : Issue Discussion : Dual GPU system

©2022 MLC@Home Team
A project of the Cognition, Robotics, and Learning (CORAL) Lab at the University of Maryland, Baltimore County (UMBC)