Re: [OMPI users] MPIIO max record size

2013-05-22 Thread Eric Chamberland
On 05/22/2013 12:37 PM, Ralph Castain wrote: Well, ROMIO was written by Argonne/MPICH (unfair to point the finger solely at Rob) and picked up by pretty much everyone. The issue isn't a bug in MPIIO, but rather Ok, sorry about that! thanks for the historical and technical informations! Eric

Re: [OMPI users] MPIIO max record size

2013-05-22 Thread Tom Rosmond
I was afraid that was the case. Too bad, because applications (and the files they use), are getting much too big for the 32 bit limit. T. Rosmond On Wed, 2013-05-22 at 09:37 -0700, Ralph Castain wrote: > On May 22, 2013, at 9:23 AM, Eric Chamberland > wrote: > > > On 05/22/2013 11:33 AM, Tom

Re: [OMPI users] MPIIO max record size

2013-05-22 Thread Ralph Castain
On May 22, 2013, at 9:23 AM, Eric Chamberland wrote: > On 05/22/2013 11:33 AM, Tom Rosmond wrote: >> Thanks for the confirmation of the MPIIO problem. Interestingly, we >> have the same problem when using MPIIO in INTEL MPI. So something >> fundamental seems to be wrong. >> > > I think but

Re: [OMPI users] Compatibility between OS, OpenMPI, and OFED

2013-05-22 Thread BRADLEY, PETER C PW
We’re seeing some abnormal performance behavior when running an OpenMPI 1.4.4 application on RH6.4 using Mellanox OFED 1.5.3. Under certain circumstances, system CPU starts dominating and performance tails off severely. This behavior does not happen with the same job run with TCP. Is there

Re: [OMPI users] basic questions about compiling OpenMPI

2013-05-22 Thread Tim Prince
On 5/22/2013 11:34 AM, Paul Kapinos wrote: On 05/22/13 17:08, Blosch, Edwin L wrote: Apologies for not exploring the FAQ first. No comments =) If I want to use Intel or PGI compilers but link against the OpenMPI that ships with RedHat Enterprise Linux 6 (compiled with g++ I presume), are

Re: [OMPI users] MPIIO max record size

2013-05-22 Thread Eric Chamberland
On 05/22/2013 11:33 AM, Tom Rosmond wrote: Thanks for the confirmation of the MPIIO problem. Interestingly, we have the same problem when using MPIIO in INTEL MPI. So something fundamental seems to be wrong. I think but I am not sure that it is because the MPI I/O (ROMIO) code is the same f

Re: [OMPI users] basic questions about compiling OpenMPI

2013-05-22 Thread Paul Kapinos
On 05/22/13 17:08, Blosch, Edwin L wrote: Apologies for not exploring the FAQ first. No comments =) If I want to use Intel or PGI compilers but link against the OpenMPI that ships with RedHat Enterprise Linux 6 (compiled with g++ I presume), are there any issues to watch out for, during l

Re: [OMPI users] basic questions about compiling OpenMPI

2013-05-22 Thread Nathan Hjelm
If you are only using the C API there will be no issues. There are no guarantees with C++ or fortran. -Nathan Hjelm HPC-3, LANL On Wed, May 22, 2013 at 03:08:31PM +, Blosch, Edwin L wrote: > Apologies for not exploring the FAQ first. > > > > If I want to use Intel or PGI compilers but lin

Re: [OMPI users] MPIIO max record size

2013-05-22 Thread Eric Chamberland
I have experienced the same problem.. and worst, I have discovered a bug in MPI I/O... look here: http://trac.mpich.org/projects/mpich/ticket/1742 and here: http://www.open-mpi.org/community/lists/users/2012/10/20511.php Eric On 05/21/2013 03:18 PM, Tom Rosmond wrote: Hello: A colleague an

[OMPI users] basic questions about compiling OpenMPI

2013-05-22 Thread Blosch, Edwin L
Apologies for not exploring the FAQ first. If I want to use Intel or PGI compilers but link against the OpenMPI that ships with RedHat Enterprise Linux 6 (compiled with g++ I presume), are there any issues to watch out for, during linking? Thanks, Ed