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

[Jed Brown]

Aron,

1. It's all NUMA

2. You don't get to repartition the matrix because that is unnatural and not
a local optimization.

3. Because of 2, the algorithms are different, so direct comparison is not
meaningful, but I do not buy that you can get the same throughput on the
kernel that is natural and makes sense as a local optimization.

Jed

On Nov 12, 2010 7:02 PM, "Aron Ahmadia" <aron.ahmadia at kaust.edu.sa> wrote:

> A partial counter-point is that MatSolve with OpenMP is unlikely to be
near the throughput of MPI-...
I am just going to throw down the gauntlet here and say that I can
reproduce or beat in (my choice of) OpenMP or pthreads on a reasonably
UMA multi-core processor anything that can be implemented in MPI.

-Aron
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