GPU+CPU percentage increase better?


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Message boards : Number crunching : GPU+CPU percentage increase better?

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Message 1349929 - Posted: 23 Mar 2013, 21:54:48 UTC

crunched on my gpu 1 wu at a time for a few days to make sure no problems. added .4999 to my config to run 2 wu at a time. was wondering if i increased or decreased the cpu load for these from 0.04% would i get any incease in output?

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Message 1349948 - Posted: 23 Mar 2013, 22:25:32 UTC - in response to Message 1349929.

crunched on my gpu 1 wu at a time for a few days to make sure no problems. added .4999 to my config to run 2 wu at a time. was wondering if i increased or decreased the cpu load for these from 0.04% would i get any incease in output?

I doubt it.
If you've got multiple video cards in a system then it'd probably be worth doing, but just for a single card- nope IMHO.
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Grant
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Message 1349949 - Posted: 23 Mar 2013, 22:25:36 UTC - in response to Message 1349929.
Last modified: 23 Mar 2013, 22:28:30 UTC

In short, No.

Basically that small CPU percentage is only used when the CPU loads a task to the GPU and that's all it's used for (and if I remember rightly the stock app has this set to about 0.5%).

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Richard Haselgrove
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Message 1349958 - Posted: 23 Mar 2013, 22:53:36 UTC - in response to Message 1349929.

crunched on my gpu 1 wu at a time for a few days to make sure no problems. added .4999 to my config to run 2 wu at a time. was wondering if i increased or decreased the cpu load for these from 0.04% would i get any incease in output?

No. The <ncpus> or <cpu_usage> tags in app_info.xml and app_config.xml respectively don't control the behaviour of the science applications in any way: they are simply there to give a hint to BOINC about how the application is likely to behave, left to its own devices.

The <count> and <gpu_usage> tags do affect things, but only indirectly - BOINC starts a different number of GPU apps at the same time, and the apps react to finding that they have less space available to work in.

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Message 1349964 - Posted: 23 Mar 2013, 23:01:24 UTC - in response to Message 1349949.

In short, No.

Basically that small CPU percentage is only used when the CPU loads a task to the GPU and that's all it's used for (and if I remember rightly the stock app has this set to about 0.5%).

Cheers.



hey thanks. didnt know if the cpu was still crunching something for the gpu wu's or not. thanks for the info and the explination

Message boards : Number crunching : GPU+CPU percentage increase better?

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