[gmx-users] cpu threads in a gpu run

[Szilárd Páll]

On Mon, Jul 9, 2018 at 12:43 PM Mahmood Naderan <nt_mahmood at yahoo.com>
wrote:

> Hi,
> When I run "-nt 16 -nb cpu", I see nearly 1600% cpu utilization.


You request the CPU to do the work, so all cores are fully utilized.


> However, when I run "-nt 16 -nb gpu", I see about 600% cpu utilization.


The default behavior is to offload if there is a GPU and if your GPU is not
fast enough to finish the work offloaded by default, you'll have imbalance
and the CPU will wait.


> Is there any reason about that? I want to know with the cpu threads in a
> gpu run is controllable.
>

See the documentation.



>
>
> Regards,
> Mahmood
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