Very interesting, I certainly hope that my problem is this and not
some kind of error. I'll put the program on some more nodes and run
some tests and see what runs fastest.
My only experience so far with MPI is with LAMMPS, and the simulation
I ran had an almost linear speedup from 1 -> 10 machines (11 -> 1.2
hours), very satisfying!
Aaron Thompson
Vanderbilt University
aaron.p.thomp...@vanderbilt.edu
On Jun 7, 2007, at 8:44 PM, Brock Palen wrote:
We have a few users using DLPOLY with OMPI. Running just fine.
Watch out what kind of simulation you are doing like all MD
software, not all simulations are better in parallel. In some the
comunication overhead is much worse than running on just one cpu. I
see this all the time. You could try just 2 cpus, on one node some
times that is ok (memory access vs network access) But its not
uncommon.
Brock Palen
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Jun 7, 2007, at 8:24 PM, Aaron Thompson wrote:
Hello,
Does anyone have experience using DL POLY with OpenMPI? I've gotten
it to compile, but when I run a simulation using mpirun with two
dual-
processor machines, it runs a little *slower* than on one CPU on one
machine! Yet the program is running two instances on each node. Any
ideas? The test programs included with OpenMPI show that it is
running correctly across multiple nodes.
Sorry if this is a little off-topic, I wasn't able to find help on
the official DL POLY mailing list.
Thank you!
Aaron Thompson
Vanderbilt University
aaron.p.thomp...@vanderbilt.edu
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