[petsc-users] GPU local direct solve of penta-diagonal

[Paul Mullowney]

Provided you have a good parallel sparse direct solve for a single SM, you
could unleash 32 direct solves (or perhaps 16) which run concurrently on
the K20x. One only needs to set an environment variable to use Hypre Q

I don't know of any good parallel sparse direct solver for small systems.

-Paul


On Thu, Dec 12, 2013 at 4:29 PM, Dominic Meiser <dmeiser at txcorp.com> wrote:

>  Hi Karli,
>
>
> On 12/12/2013 02:50 PM, Karl Rupp wrote:
>
>
> Hmm, this does not sound like something I would consider a good fit for
> GPUs. With 16 MPI processes you have additional congestion of the one or
> two GPUs per node, so you would have the rethink the solution procedure as
> a whole.
>
>  Are you sure about that for Titan? Supposedly the K20X's can deal with
> multiple MPI processes hitting a single GPU pretty well using Hyper-Q. Paul
> has seen pretty good speed up with small GPU kernels simply by
> over-subscribing each GPU with 4 MPI processes.
>
> See here:
>
> http://blogs.nvidia.com/blog/2012/08/23/unleash-legacy-mpi-codes-with-keplers-hyper-q/
>
>
> Cheers,
> Dominic
>
>
> --
> Dominic Meiser
> Tech-X Corporation
> 5621 Arapahoe Avenue
> Boulder, CO 80303
> USA
> Telephone: 303-996-2036
> Fax: 303-448-7756www.txcorp.com
>
>
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