What is the difference between CPU and GPU units?


Advanced search

Questions and Answers : Windows : What is the difference between CPU and GPU units?
Message board moderation

To post messages, you must log in.

AuthorMessage
Profile David@home
Volunteer tester
Avatar

Send message
Joined: 16 Jan 03
Posts: 755
Credit: 5,040,916
RAC: 28
United Kingdom
Message 1887747 - Posted: 3 Sep 2017, 17:07:05 UTC

Hi

Not crunched in awhile so trying to work out all the changes. One of the things I cannot figure is the workunit type ending in cuda. Are these run on the graphics card only? If so how does the science differ or is it the same science but different way to compute?

I also have workunits with different numbers after cuda e.g. cuda50, cuda42. What does this number mean please?
ID: 1887747 · Report as offensive
Profile Mr. Kevvy Crowdfunding Project Donor*Special Project $250 donor
Volunteer moderator
Volunteer tester
Avatar

Send message
Joined: 15 May 99
Posts: 3776
Credit: 1,114,826,392
RAC: 3,319
Canada
Message 1887749 - Posted: 3 Sep 2017, 17:17:42 UTC
Last modified: 3 Sep 2017, 17:18:20 UTC

The workunits are exactly the same. The scheduler just sends out the type of work that the client's platform CPU or GPU can process; the local BOINC client then assigns them to the relevant CUDA or OpenCL platform that is installed.
ID: 1887749 · Report as offensive
rob smith Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Volunteer moderator
Volunteer tester

Send message
Joined: 7 Mar 03
Posts: 22204
Credit: 416,307,556
RAC: 380
United Kingdom
Message 1887756 - Posted: 3 Sep 2017, 17:52:13 UTC
Last modified: 3 Sep 2017, 17:52:27 UTC

CUDA42 and CUDA50 indicate the version of CUDA to be used. During the first few days (weeks) using a new rig each of the versions of CUDA will be tried to establish the fastest on that rig. You may also see OpenCL or SoG, these are again variations on the application that use different underlying technologies.
Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?
ID: 1887756 · Report as offensive
Profile David@home
Volunteer tester
Avatar

Send message
Joined: 16 Jan 03
Posts: 755
Credit: 5,040,916
RAC: 28
United Kingdom
Message 1887772 - Posted: 3 Sep 2017, 19:47:10 UTC

Thanks for the replies, I have managed to get my perferences setup so now running both GPU and CPU work units.
ID: 1887772 · Report as offensive

Questions and Answers : Windows : What is the difference between CPU and GPU units?


 
©2024 University of California
 
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.