Hi!

I've recently joined. I've been a not so frequent GPU cruncher for another project, but since their servers are quite random distributing work for GPUs i've moved to GPUGRID.

I would like to allocate only the GPU for this project, leaving the CPU free to crunch on CPU specifics projects.

I'm aware it is always needed a small % to feed the GPU. What i would like was no WUs being specifically sent to the CPU.

On other projects there is the option, on the preferences page, to "disable" the CPU. I've been to that preference page here on GPUGRID, but even after unticking the USE CPU box and applying the settings, after refreshing the page it still continues enabled.

Is it project behavior or some malfunction? Can't i permanently disable the CPU?

They don't have any CPU-app here.
But, especially on Linux, the app uses a considerably large amount of CPU (if they restore the old one again, the actual one isn't capable of running on Linux at all).
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Gruesse vom Saenger

For questions about Boinc look in the BOINC-Wiki

Thanks for your answer!

It is a fact there is no CPU app on the site. However BOINC is the application that i am using and it can use both CPU and GPU.

Since there is an option at the account preferences for CPU and or GPU use my doubt was motivated by that.

Well as it seems i won't be also able to help this project. At least in a relatively normal way. I've got a 260GTX (65nm) and after several WU's crashing the video driver, i've been searching around and found that apparently these cards suffer from some kind of CUDA/application bug that may render many WU's aborted due to computation error...

Information is quite scarce and i'm still trying to find more details. However if anyone is enlightened enough to shed some light...?

I suppose you have already updated your nvidia drivers...
The most recent drivers from nvidia seem to be causing some problems...
you might want to consider reverting to some previous version
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If I un-check the "Use Central Processing Unit (CPU)" box in the project settings, what it will result in?
And what does this setting mean "Maximum CPU % for graphics"?
I understand GPUgrid is not supposed to involve any CPU usage when its WU is running? I really would not like that because I want all my CPUs working with other purely CPU projects...
Then, what does it mean, when a WU is running there is this comment next to its name "(NVidia + 0,7 CPU)?
I have a GTX680 and Windows 7-64
Please advise how to minimize the CPU usage.
Thank you.

If I un-check the "Use Central Processing Unit (CPU)" box in the project settings, what it will result in?

And what does this setting mean "Maximum CPU % for graphics"?

I understand GPUgrid is not supposed to involve any CPU usage when its WU is running?

I really would not like that because I want all my CPUs working with other purely CPU projects...

Then, what does it mean, when a WU is running there is this comment next to its name "(NVidia + 0,7 CPU)?

I have a GTX680 and Windows 7-64
Please advise how to minimize the CPU usage.

Thank you for the detailed reply.
My situation was that I had 2 projects running on my Boinc client: GPUgrid and Rosetta. At some point, Rosetta WUs started to fail, they finished working all right, went off the the server and got "Client Error" there. So my daily quota dropped to minimal. I suspected the reason could be the 2 projects ran simultaneously and GPUgrid somehow interfered and spoilt Rosetta WUs. However, after some experimenting and discussing the problem on my team forum, I got convinced it was not the case. I am glad I can continue supporting GPUgrid.

Thank you for the detailed reply.
My situation was that I had 2 projects running on my Boinc client: GPUgrid and Rosetta. At some point, Rosetta WUs started to fail, they finished working all right, went off the the server and got "Client Error" there. So my daily quota dropped to minimal. I suspected the reason could be the 2 projects ran simultaneously and GPUgrid somehow interfered and spoilt Rosetta WUs. However, after some experimenting and discussing the problem on my team forum, I got convinced it was not the case. I am glad I can continue supporting GPUgrid.

I left Rostta due to this. It isn't a GPUGRID bug. I couldn't even run Rosetta exclusively!

BOINC makes it difficult to download enough CPU workunits if you have a GPU but no GPU workunits - it insists on getting a GPU workunit before it will even try to get CPU workunits, even if you've told it not to run anything on the GPU.

Rosetta@Home tried recompiling their application to run on a GPU, and found that it is so serial in nature that it often runs slower on a GPU than on a CPU. Therefore, they gave up on offering any GPU workunits any time soon.

One way to get close to running on the GPU only is to subscribe only to BOINC projects that offer only GPU workunits.

BOINC makes it difficult to download enough CPU workunits if you have a GPU but no GPU workunits - it insists on getting a GPU workunit before it will even try to get CPU workunits, even if you've told it not to run anything on the GPU.

Rosetta@Home tried recompiling their application to run on a GPU, and found that it is so serial in nature that it often runs slower on a GPU than on a CPU. Therefore, they gave up on offering any GPU workunits any time soon.

One way to get close to running on the GPU only is to subscribe only to BOINC projects that offer only GPU workunits.