I guess this question was already before https://svn.open-mpi.org/trac/ompi/ticket/1367 On Thu, Jul 9, 2009 at 10:35 AM, Lenny Verkhovsky < lenny.verkhov...@gmail.com> wrote:
> BTW, What kind of threads Open MPI supports ? > I found in the https://svn.open-mpi.org/trac/ompi/browser/trunk/READMEthat we > support MPI_THREAD_MULTIPLE, > and found few unclear mails about MPI_THREAD_FUNNELED and > MPI_THREAD_SERIALIZED. > Also found nothing in FAQ :(. > Thanks,Lenny. > > On Thu, Jul 2, 2009 at 6:37 AM, rahmani <m_rahman...@me.iut.ac.ir> wrote: > >> Hi, >> Very thanks for your discussion >> >> ----- Original Message ----- >> From: "Jeff Squyres" <jsquy...@cisco.com> >> To: "Open MPI Users" <us...@open-mpi.org> >> Sent: Tuesday, June 30, 2009 7:23:13 AM (GMT-0500) America/New_York >> Subject: Re: [OMPI users] enable-mpi-threads >> >> On Jun 30, 2009, at 1:29 AM, rahmani wrote: >> >> > I want install openmpi in a cluster with multicore processor. >> > Is it necessary to configure with --enable-mpi-threads option? >> > when this option should be used? >> > >> >> >> Open MPI's threading support is functional but not optimized. >> >> It depends on the problem you're trying to solve. There's many ways >> to write software, but two not-uncommon models for MPI applications are: >> >> 1. Write the software such that MPI will launch one process for each >> core. You communicate between these processes via MPI communication >> calls such as MPI_SEND, MPI_RECV, etc. >> >> 2. Write the software that that MPI will launch one process per host, >> and then spawn threads for all the cores on that host. The threads >> communicate with each other via typical threaded IPC mechanisms >> (usually not MPI); MPI processes communicate across hosts via MPI >> communication calls. Sometimes MPI function calls are restricted to >> one thread; sometimes they're invoked by any thread. >> >> So it really depends on how you want to write your software. Make >> sense? >> >> -- >> Jeff Squyres >> Cisco Systems >> >> _______________________________________________ >> 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 >> > >
