Maybe a CFD jargon?
Perhaps the number (not size) of cells in a mesh/grid being handled
by each core/cpu?
Ralph Castain wrote:
I have no idea what you mean by "cell sizes per core". Certainly not any
terminology within OMPI...
On Dec 15, 2010, at 3:47 PM, Vaz, Guilherme wrote:
Dear all,
I have a problem with openmpi1.3, ifort+mkl v11.1 in Ubuntu10.04
systems (32 or 64bit). My code worked in Ubuntu8.04 and works in
RedHat based systems, with slightly different version changes on mkl
and ifort. There were no changes in the source code.
The problem is that the application works for small cell sizes per
core, but not for large cell sizes per core. And it always works for 1
core.
Example: a grid with 1.2Million cells does not work with mpiexec -n 4
<my_app> but it works with mpiexec -n 32 <my_app>. It seems that there
is a maximum of cell/core. And it works with <my_app>.
Is this a stack size (or any memory problem)? Should I set the ulimit
-s unlimited not only on my bashrc but also in the ssh environment
(and how)? Or is something else?
Any clues/tips?
Thanks for any help.
Gui
<imagec393d1.JPG><image4c4685.JPG>
dr. ir. Guilherme Vaz
CFD Researcher
Research & Development
*MARIN*
2, Haagsteeg
E g....@marin.nl <mailto:g....@marin.nl> P.O. Box 28 T +31 317 49 39 11
6700 AA Wageningen F +31 317 49 32 45
T +31 317 49 33 25 The Netherlands I www.marin.nl <http://www.marin.nl>
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