Need muti GPU work for same work unit together

Moderators: Site Moderators, FAHC Science Team

Post Reply
tjchkj
Posts: 2
Joined: Thu Aug 24, 2023 5:35 am

Need muti GPU work for same work unit together

Post by tjchkj »

When V8 can made all GPUs work for same work unit at same time ?
PaulTV
Posts: 201
Joined: Mon Jan 25, 2021 4:53 pm
Location: Netherlands

Re: Need muti GPU work for same work unit together

Post by PaulTV »

That's very unlikely to happen. It'd require a *lot* of data transfer back and forth between the GPUs (threads need each other's data), which would slow everything down horribly.
Image

Ryzen 5800X / RTX 4090 / Windows 11
Ryzen 5600X / RTX 3070 Ti / Ubuntu 22.04
Ryzen 5600 / RTX 3060 Ti / Windows 11
Joe_H
Site Admin
Posts: 7922
Joined: Tue Apr 21, 2009 4:41 pm
Hardware configuration: Mac Pro 2.8 quad 12 GB smp4
MacBook Pro 2.9 i7 8 GB smp2
Location: W. MA

Re: Need muti GPU work for same work unit together

Post by Joe_H »

They looked into it a number of years ago, testing showed too much PCI overhead transferring data between GPUs. It was determined that running one WU on one GPU was a better use of resources.
Image

iMac 2.8 i7 12 GB smp8, Mac Pro 2.8 quad 12 GB smp6
MacBook Pro 2.9 i7 8 GB smp3
toTOW
Site Moderator
Posts: 6349
Joined: Sun Dec 02, 2007 10:38 am
Location: Bordeaux, France
Contact:

Re: Need muti GPU work for same work unit together

Post by toTOW »

It's already hard to get WU that have enough atoms to fully use the biggest GPUs ... image the pain it would be with more than one at once ... :(
Image

Folding@Home beta tester since 2002. Folding Forum moderator since July 2008.
Post Reply