[mpich-discuss] MPICH2 and GPU

[Jayesh Krishna]

Hi,
 Good to know it worked for you. I am working on couple of projects and don't have enough bandwidth to work on this item right now. Will keep this in the todo list for now.

-Jayesh

----- Original Message -----
From: "bob ilgner" <bobilgner at gmail.com>
To: "Jayesh Krishna" <jayesh at mcs.anl.gov>
Sent: Wednesday, May 18, 2011 10:31:41 AM
Subject: Re: [mpich-discuss] MPICH2 and GPU

Hi Jayesh,

This worked! I had read of this before in one of the forums but only
tried the -l option which ran but gave me incorrect answers.

All that may be needed at the moment is an update to the Mpich2
documentation. I searched the mpich2 manual but did not really know
what I was looking for. A GPU reference in one of the manuals would
help a lot.

The mpi references on the Nvidia forums are steadily rising Jayesh. It
would be good if you could collaborate with GPU mfctr as hybrids and
new  APUs are inevitable.

Thanks for the assistance with this.

Regards, bob

On Wed, May 18, 2011 at 4:34 PM, Jayesh Krishna <jayesh at mcs.anl.gov> wrote:
> Hi,
>  Try using the "-localonly" option (or "-localroot" option) to use the GPUs on the local node. Supporting usage of GPUs on non-local nodes is in our to-do list.
>
> Regards,
> Jayesh
>
> ----- Original Message -----
> From: "bob ilgner" <bobilgner at gmail.com>
> To: mpich-discuss at mcs.anl.gov
> Sent: Wednesday, May 18, 2011 1:25:45 AM
> Subject: [mpich-discuss] MPICH2 and GPU
>
> Dear All,
>
> I have two GPUs on 1 motherboard and want to use MPI to control the
> CUDA on each GPU.
>
> Program runs well in Windows 7 environment without MPICH2
>
> When using "mpiexec -n 2 progname" then the CUDA error calls tell me
> "no CUDA-capable device is detected".
>
> i.e. the error only arises in the MPI environment.
>
> Has anyone else experienced this before and is there something I need
> to do with Mpich2 to be able to detect the GPUs ?
>
> Regards, bob
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