CUDA slows desktop down


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nurbs999

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Message 865331 - Posted: 14 Feb 2009, 11:22:23 UTC

Hello!

i'm running boinc6.4 with seti and CUDA support is on. the problem is that my pc responses only every two seconds and redrawing 2D graphics runs very slow (eg moving an explorer window). if i stop boinc everything is back to normal.

here some info about my system:
C2D E4400
GeForce 8800 GTS 320M (driver 181.22)
windows xp sp3 32-bit

greetings nurbs999
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Profile Jord
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Message 865335 - Posted: 14 Feb 2009, 11:31:46 UTC - in response to Message 865331.  

This is known to the developers. It's also explained in detail in this FAQ. A fix for this behaviour will be forthcoming.
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Message 865339 - Posted: 14 Feb 2009, 11:53:19 UTC

ok, thanks for the info.
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Message 867586 - Posted: 21 Feb 2009, 5:19:48 UTC - in response to Message 865339.  

I've the same problem, but it happens when I'm using a different session than the firstone after booting. This is beacuse for some reason, CUDA reverts back to CPU processing only. Since CUDA tasks have a fixed "normal" priority, they take up both my CPU cores (y have 2 GPUs so 2 CUDAs are always running), hardly leaving any processing time for all the other tasks.
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Message 867592 - Posted: 21 Feb 2009, 5:23:50 UTC - in response to Message 867586.  

Since CUDA tasks have a fixed "normal" priority, they take up both my CPU cores (y have 2 GPUs so 2 CUDAs are always running), hardly leaving any processing time for all the other tasks.


BOINC is supposed to launch all science apps at the lowest priority. Are you sure that its not because GPUs were not intended for multitasking, so they don't actually have priorities, which has little to do with the app running on the OS?
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Message 867637 - Posted: 21 Feb 2009, 9:03:29 UTC - in response to Message 867592.  

The part of the application running on the CPU runs at normal priority; if it were to run at any lower priority it would take ages and make it more error prone to move the task for the GPU into the GPU's memory and back.

Whether or not the GPU runs at normal priority doesn't matter. For now it can only do one task at the same time anyway.
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Questions and Answers : GPU applications : CUDA slows desktop down


 
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