PETSc on GPUs

[Ahmed El Zein]

On Thu, 2008-09-18 at 10:20 -0500, Matthew Knepley wrote:
> > A question that I had regarding the PETSc code when I was thinking
> about
> > this was:
> > You have the SeqAIJ matrix type and the the MPIAIJ type built around
> it
> > (or that is what I understand from the code). So basically you
> implement
> > the SeqAIJ type for the GPU and you get the MPI type for free?
> 
> Yes, that is true. However, note that in the MPI step, you will need a
> gather
> operation to get the second matrix multiply to work.
Matt,
Could you explain a bit more?

Ahmed