Re: [OMPI devel] Open-MPI build of NAMD launched from srun over 20% slowed than with mpirun

2013-09-05 Thread Christopher Samuel
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Ralph, On 05/09/13 12:50, Ralph Castain wrote: > Jeff and I were looking at a similar issue today and suddenly > realized that the mappings were different - i.e., what ranks are > on what nodes differs depending on how you launch. You might want

Re: [OMPI devel] Open-MPI build of NAMD launched from srun over 20% slowed than with mpirun

2013-09-05 Thread Ralph Castain
No, nothing significant there. Afraid I've exhausted my thoughts on why the difference might exist. Anyone else care to chime in? On Sep 4, 2013, at 9:34 PM, Christopher Samuel wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Hi Ralph, > > On 05/09/13

Re: [OMPI devel] Open-MPI build of NAMD launched from srun over 20% slowed than with mpirun

2013-09-05 Thread Hjelm, Nathan T
I assume that process binding is enabled for both mpirun and srun? If not that could account for a difference between the runtimes. -Nathan From: devel [devel-boun...@open-mpi.org] on behalf of Ralph Castain [r...@open-mpi.org] Sent: Thursday, September