[gmx-users] cpu threads in a gpu run

Szilárd Páll pall.szilard at gmail.com
Thu Jul 12 16:31:28 CEST 2018

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

> 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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