CPU Use Count Not Same as Logical CPUs

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BubbaJNelson
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CPU Use Count Not Same as Logical CPUs

Post by BubbaJNelson »

CPU use count used is not same as Logical CPUs... I have a desktop with four cores and eight logical CPUs. LAH shows only seven logical CPUs in use. I have another desktop with two sockets, each with four cores and eight logical CPUs. LAH shows only 31 logical CPUs in use. Please explain. Thanks.
BobWilliams757
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Re: CPU Use Count Not Same as Logical CPUs

Post by BobWilliams757 »

From my understanding, one logical CPU/thread will be used to feed the GPU on a system. I'm not completely sure if there is any way to resolve that, since even built in graphics need CPU resources to feed data to them.
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JimboPalmer
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Re: CPU Use Count Not Same as Logical CPUs

Post by JimboPalmer »

Welcome to Folding@Home!

If you have a AMD or Nvidia GPU F@H will reserve 1 thread (F@H calls them CPUs) to feed the GPU with data. If you do not fold with your GPU, you can delete the GPU slot and use all the CPUs.
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jrweiss
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Re: CPU Use Count Not Same as Logical CPUs

Post by jrweiss »

You should use the Configure tab on the FAHControl screen to reconfigure those to 6 and 30 logical CPUs, respectively. The F@H client does not work well with CPU counts that are Prime numbers.

Also, you might get better usage by limiting the dual-socket machine to 12 CPUs for each CPU Slot. There are often more Work Units available for the lower core count, and sometimes the client fails to assign a WU if it sees a large core count in the slot. Reduce the current slot to 12 CPUs. Then add 2 more slots, with 12 and 6 (or 8, if not Folding with the GPU) CPUs, respectively.
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BubbaJNelson
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Re: CPU Use Count Not Same as Logical CPUs

Post by BubbaJNelson »

Thanks. I am now running on all threads/CPUs/Slots.
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Re: CPU Use Count Not Same as Logical CPUs

Post by Neil-B »

A 32core should be kept busy 24/7 at the moment on advance flag and is better for the science and points than splitting up ... I have only once had the AS not have a WU for that slot and it dropped in a 12core WU instead and down cored the slot for that WU.
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