You should probably also run the ompi_info command; it tells you details about your installation, and how it was configured.
Is it known that OpenFoam uses threads with MPI? On Jan 17, 2012, at 9:08 AM, Ralph Castain wrote: > You might first just try running a simple MPI "hello" to verify the > installation. I don't know if OF is threaded or not. > > Sent from my iPad > > On Jan 17, 2012, at 5:22 AM, John Hearns <hear...@googlemail.com> wrote: > >> Andre, >> you should not need the OpenMPI sources. >> >> Install the openmpi-devel package from the same source >> (zypper install openmpi-devel if you have that science repository enabled) >> This will give you the mpi.h file and other include files, libraries >> and manual pages. >> >> That is a convention in Suse-style distros - the devel package >> contains the stuf you need to 'develop' >> >> On 17/01/2012, Theiner, Andre <andre.thei...@hp.com> wrote: >>> Hi Devendra, >>> thanks for your interesting answer, up to now I expected to get a fully >>> operational openmpi installation package >>> by installing openmpi from the “science” repository ( >>> http://download.opensuse.org/repositories/science/openSUSE_11.3” ). >>> To compile your script I need to have the openmpi sources which I do not >>> have at present, I will try to get them. >>> How do I compile and build using multiple processors? >>> Is there a special flag which tells the compiler to care for multiple CPUs? >>> >>> Andre >>> >>> >>> From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On >>> Behalf Of devendra rai >>> Sent: Montag, 16. Januar 2012 13:25 >>> To: Open MPI Users >>> Subject: Re: [OMPI users] mpirun hangs when used on more than 2 CPUs >>> >>> Hello Andre, >>> >>> It may be possible that your openmpi does not support threaded MPI-calls (if >>> these are happening). I had a similar problem, and it was traced to this >>> cause. If you installed your openmpi from available repositories, chances >>> are that you do not have thread-support. >>> >>> Here's a small script that you can use to determine whether or not you have >>> thread support: >>> >>> #include <mpi.h> >>> #include <iostream> >>> int main(int argc, char **argv) >>> { >>> int myrank; >>> int desired_thread_support = MPI_THREAD_MULTIPLE; >>> int provided_thread_support; >>> >>> MPI_Init_thread(&argc, &argv, desired_thread_support, >>> &provided_thread_support); >>> >>> /* check if the thread support has been provided */ >>> if (provided_thread_support!=desired_thread_support) >>> { >>> std::cout << "MPI thread support not available! Aborted. " << >>> std::endl; >>> exit(-1); >>> } >>> MPI_Finalize(); >>> return 0; >>> } >>> >>> Compile and build as usual, using multiple processors. >>> >>> Maybe this helps. If you do discover that you do not have support available, >>> you will need to rebuild MPI with --enable-mpi-threads=yes flag. >>> >>> HTH. >>> >>> >>> Devendra >>> >>> ________________________________ >>> From: "Theiner, Andre" <andre.thei...@hp.com> >>> To: "us...@open-mpi.org" <us...@open-mpi.org> >>> Sent: Monday, 16 January 2012, 11:55 >>> Subject: [OMPI users] mpirun hangs when used on more than 2 CPUs >>> >>> >>> Hi everyone, >>> may I have your help on a strange problem? >>> High performance computing is new to me and I have not much idea about >>> OpenMPI and OpenFoam (OF) which uses the “mpirun” command. >>> I have to support the OF application in my company and have been trying to >>> find the problem since about 1 week. >>> The versions are openmpi-1.3.2 and OF 2.0.1 which are running on openSUSE >>> 11.3 x86_64. >>> The computer is brand new, has 96 GB RAM, 12 CPUs and was installed with >>> Linux some weeks ago. >>> I installed OF 2.0.1 according to the vendors instructions at >>> http://www.openfoam.org/archive/2.0.1/download/suse.php. >>> >>> Here the problem: >>> The experienced user tested the OF with a test case out of one of the >>> vendors tutorials. >>> He only used the computing power of his local machine “caelde04” , no other >>> computers were accessed by mpirun. >>> >>> He found no problem when testing in single “processor mode” but in >>> “multiprocessor mode” his calculations hangs when he distributes >>> the calculations to more than 2 CPUs. The OF vendor thinks this is an >>> OpenMPI problem somehow and that is why I am trying to get >>> help from this forum here. >>> I attached 2 files, one is the “decomposeParDict” which resides in the >>> “system” subdirectory of his test case and the other is the log file >>> from the “decomposePar” command and the mpirun command “mpirun -np 9 >>> interFoam –parallel”. >>> Do you have an idea where the problem is or how I can narrow it down? >>> Thanks much for any help. >>> >>> Andre >>> >>> >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org<mailto:us...@open-mpi.org> >>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
