Advanced search

Message boards : Graphics cards (GPUs) : add a third gpu and the calculation dropped

Author Message
philalux
Send message
Joined: 23 Mar 19
Posts: 13
Credit: 209,159,150
RAC: 174,722
Level
Leu
Scientific publications
wat
Message 51722 - Posted: 24 Apr 2019 | 19:17:35 UTC

Hello,

I have 2 gpu nvidia 1070ti that work well with gpugrid (98% of use each).
i have just added a third identical gpu and the average usage of the three gpu has dropped between 60% and 80%, changing continuously.

the CPU is an intel G4400 3.3GHz (2 core at 100% non stop)

is there a limit in the number of gpu for gpugrid?
does the the power of the CPU is important ?

thank you

Matt Kowal
Avatar
Send message
Joined: 27 May 14
Posts: 9
Credit: 89,194,351
RAC: 177,612
Level
Thr
Scientific publications
wat
Message 51723 - Posted: 24 Apr 2019 | 19:50:31 UTC - in response to Message 51722.

There is no GPU limit. Generally, it is recommended to provide 1x CPU core for each GPU.

Keith Myers
Send message
Joined: 13 Dec 17
Posts: 257
Credit: 234,046,463
RAC: 70
Level
Leu
Scientific publications
wat
Message 51724 - Posted: 24 Apr 2019 | 20:20:07 UTC - in response to Message 51723.

There is no GPU limit. Generally, it is recommended to provide 1x CPU core for each GPU.

Actually there IS a physical BOINC limit of 64 gpus max.

PappaLitto
Send message
Joined: 21 Mar 16
Posts: 502
Credit: 4,274,088,001
RAC: 1,808,270
Level
Arg
Scientific publications
watwatwat
Message 51725 - Posted: 24 Apr 2019 | 20:49:15 UTC - in response to Message 51723.

There is no GPU limit. Generally, it is recommended to provide 1x CPU core for each GPU.

I would recommend putting the 3rd card in another PC if you can. I would say minimum of one core per GPU

philalux
Send message
Joined: 23 Mar 19
Posts: 13
Credit: 209,159,150
RAC: 174,722
Level
Leu
Scientific publications
wat
Message 51726 - Posted: 24 Apr 2019 | 21:09:59 UTC

well, thanks for the advice.

I see that the rule "one core per GPU" looks correct.

mmonnin
Send message
Joined: 2 Jul 16
Posts: 255
Credit: 647,700,389
RAC: 65
Level
Lys
Scientific publications
wat
Message 51727 - Posted: 24 Apr 2019 | 23:02:36 UTC

Thats the case if you're spinning. If not, 2 cores can handle several more GPUs. The card is easily fast enough to run 2x at once to achieve 95% util at 5-20% CPU per task.

Post to thread

Message boards : Graphics cards (GPUs) : add a third gpu and the calculation dropped