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

[Jed Brown]

On Fri, Nov 12, 2010 at 14:51, Rodrigo R. Paz <rodrigop at intec.unl.edu.ar>wrote:

> IMHO, the main problem here is the low memory bandwidth (FSB) in Xeon E5420
> nodes.


This is well-known and fundamental (not dependent on the programming model).
 It appears that you are comparing OpenMP threading within a node to a
single thread.  The comparison we are more interested is with an equivalent
number of MPI processes per node.

Jed
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