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GPU folding consume 1 physical CPU core

post #1 of 4
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Hello everyone

 

I just started folding for OCN!

One thing I notice is that GPU folding uses up 12.5% CPU, which in my case is one full physical CPU core. Is this normal? I read somewhere that this was only a problem for AMD, not Nvidia.

 

Also, my CPU client refuses to get new WU when CPU count is set at the default -1. It only works when I set it to 6, but then my CPU usage is only 93% not 100% and PPD suffers a bit. I read on the F@H forum that the core count has to be an even number. Is this correct? Should I set it to 8 instead?

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post #2 of 4
Quote:
Originally Posted by james8 View Post

Hello everyone

I just started folding for OCN!
One thing I notice is that GPU folding uses up 12.5% CPU, which in my case is one full physical CPU core. Is this normal? I read somewhere that this was only a problem for AMD, not Nvidia.

Also, my CPU client refuses to get new WU when CPU count is set at the default -1. It only works when I set it to 6, but then my CPU usage is only 93% not 100% and PPD suffers a bit. I read on the F@H forum that the core count has to be an even number. Is this correct? Should I set it to 8 instead?


Hi James8,

Leave 1 core/thread on your CPU available for GPU folding.
As for not receiving WU on 7 threads, it is possible that there are no WU's available for this thread count.
Personally, I would not fold on the CPU and just concentrate on the 980Ti, the points from that GPU will be about 20X to 30X that of the CPU .

PS - Welcome to the Team thumb.gif
post #3 of 4
If you want to fold on the CPU, you should set it to smp6. The slight decrease in production on the CPU, will be more than made up by your GPU having the CPU resources it needs. Years ago it was only an AMD issue, but then the tables flipped and it was only an NVIDIA problem. Now I believe that both AMD and NVIDIA GPUs need a free core to feed the GPU.

There is a bug with the underlying gromacs code if CPU count is set to a prime number. This is an old issue, but apparently it is a bug that has gotten worse with the newest client.

I don't have the link to the thread on the folding forum, but I believe that the issue was never resolved initially, because there really weren't any multi-core CPUs around. It looks like some people are also having issues with smp5, which I used to run without any issues.
post #4 of 4
Better to not fold on CPU in my opinion. Often times it can actually lower PPD.

Tictoc is right though, CPU folding hasn't played nice with prime numbers for a loonnngggg time.
    
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