Thanks for the info, Jeff. It sounds like THREAD_SINGLE is the only known working option available currently? Is there really a difference between that and THREAD_FUNNELED? Like if I have 2 threads, but only the main thread is the one making MPI calls, is that allowed? It seems to work, but I wasn't sure if there was something else that would cause it to lock or fail somewhere.
Thanks, Matt ______________________________ Matt Cupp Battelle Memorial Institute Statistics and Information Analysis -----Original Message----- From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of Jeff Squyres Sent: Friday, October 13, 2006 5:07 PM To: Open MPI Users Subject: Re: [OMPI users] OpenMPI 1.1.1 with Multiple Thread Support The problem is that we haven't done a whole lot of testing yet for multiple thread support. In particular, OMPI was fundamentally designed for both THREAD_MULTIPLE and progression thread support, and several groups have done testing to ensure that when compiled with multiple thread support, OMPI doesn't just hang, but: - I don't know if we have tested the progress thread support in quite a long time, and - Even though OMPI has been tested to ensure that we don't have boneheaded extra locks/unlocks, not a whole lot of testing has occurred to ensure that THREAD_MULTIPLE support is completely solid. As such, I'd be surprised if THREAD_MULTIPLE works for any applications that do anything reasonably "interesting" with multiple threads and MPI (it pains me to say this, but I'd rather be honest than string you along! :-( ). That being said, THREAD_MULTIPLE support is going to become more relevant in the next several months (i.e., various organizations have a vested interest in THREAD_MULTIPLE and the work will resume in this area).
