Excellent point that is often overlooked. Be sure you compiled
optimized - i.e., "mpicc -O3" (or whatever O-level you want).
OMPI's wrapper compilers do NOT contain optimization flags.
On Sep 20, 2009, at 9:50 AM, Jed Brown wrote:
Brian Powell wrote:
I ran a final test which I find very stra
Did you set -mca mpi_paffinity_alone 1? This will bind the processes
to cores and (usually) significantly improve performance.
The upcoming 1.3.4 will have additional binding options to help with
performance issues.
On Sep 20, 2009, at 12:36 AM, Brian Powell wrote:
Greetings,
I recently
Brian Powell wrote:
> I ran a final test which I find very strange: I ran the same test case
> on 1 cpu. The MVAPICH2 case was 23% faster!?!? This makes little sense
> to me. Both are using ifort as the mpif90 compiler using *identical*
> optimization flags, etc. I don't understand how the results
Dear all,
The CPMD application which is compiled with OpenMPI-1.3 (Intel 10.1
compilers) on CentOS-4.5, fails only, when a specific node i.e. node-0-2 is
involved. But runs well on other nodes.
Initially job failed after 5-10 mins (on node-0-2 + some other
nodes). After googling error,
Greetings,
I recently purchased and set up a new blade cluster using Xeon 5560
CPUs, Mellanox DDR ConnectX cards, running CentOS 5.2. I use the
cluster to run a large FORTRAN 90 fluid model. I have been using
OpenMPI on my other clusters for years, and it is my default MPI
environment.
