[petsc-dev] PETSc programming model for multi-core systems

[Matthew Knepley]

On Fri, Nov 12, 2010 at 9:52 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   What should we use a for programming model for PETSc on multi-core
> systems? Currently for conventional multicore we have only have one MPI
> process per core and for GPU we have subclasses of Vec and Mat with custom
> CUDA code.
>
>   Should we introduce subclasses of Vec and Mat built on pthreads (this is
> what Bill G recommends, and not to use OpenMP)?
>

pthreads are a nightmare and do not do vectorization right, which is
necessary here. I am for OpenCL/CUDA. Eventually
I think OpenCL will take its head out of its ass and be as nice as CUDA.

  Matt


>   Is there a way to have some kind of consistent model between conventional
> multicore and GPU multi-core? If not the same code. What about this MCUDA
> stuff?
>
>   Barry
>
-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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