Quad Core plus 2 cuda uses only 3 cpu cores.

All of a sudden this quad core with 2 cuda cards, started utilizing only 3 of the 4 cpu cores.

I've read that this un-bottlenecks gpu processing, but if i watch cpu utilization, it floats around 80%. I would like to test this, but i can't seem to get the 4th cpu core back online.

Any advice appreciated.

If the values for "1 CUDA + 0.x CPU" in the Status column of the Tasks tab sum up to more than 1 cpu; BOINC will use that count of CPUs to feed the GPUs.

There's no easy way around that when you are using stock applications.

One way would be using the anonymous platform mechanism. Then you yourself can set the fraction of CPUs used in the app_info.xml file.

Another way might be telling BOINC that you have 5 cores instead of the really existing 4 ones, using the cc_config.xml file, but that's only speculation on my side.

If the links I gave you don't provide enough information, you should ask in the Number crunching subforum for help.

Gruß,
Gundolf
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Computer sind nicht alles im Leben. (Kleiner Scherz)

SETI@home classic workunits 3,758
SETI@home classic CPU time 66,520 hours

ah, yes. i see now. each cuda card (2) says 0.53 cpu, so that would add up to 1 core. if i recall, they _used_ to read 0.12 each. i wonder why that changed. it doesn't appear accurate according to task manager. 0.12 would however.

anyhow, settting the config file to max 5 cpu has me back to 4 cpu and 2 gpu tasks..so far, with no noticable loss in performance on either.

thanks a bunch. this will help me catch my bud in unit counts..the ten year battle resumes!!!! eat this iceman!! lol

1) Try to switch SLI Off
2) Look in Messages tab for a clue why the GPUs are not used
(in BOINC 6.12.2 I think it is hidden in Advanced menu)


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- ALF - "Find out what you don't do well ..... then don't do it!" :)