Thanks a lot guys for your help. I am also trying a design where I have one thread doing MPI and others doing some computation (non-MPI). If I have only MPI_THREAD_SINGLE enabled for OpenMPI, can I still implement this kind of a design or there would be issues with threads in OpenMPI.
-Thanks and Regards, Sarang. Quoting "Brian W. Barrett" <bbarr...@lanl.gov>: > There are two ways you can find out if an Open MPI build has > MPI_THREAD_MULTIPLE support: > > * On the command line: You can run "ompi_info | grep Thread". If you > see > mpi: no, the build doesn't support MPI_THREAD_MULTIPLE. If you see > mpi: > yes, the build does support MPI_THREAD_MULTIPLE. > > * At run-time. As mentioned below, if you request > MPI_THREAD_MULTIPLE and > provided is only MPI_THREAD_SINGLE, then Open MPI does not have > MPI_THREAD_MULTIPLE support. > > > Good luck, > > Brian > > > You are already there. the fact that MPI_Thread_init only provide > > MPI_THREAD_SINGLE shows that MPI_THREAD_MULTIPLE is NOT enabled in > the > > library binary that you're using. Although MPI_THREAD_MULTIPLE is > > implemented in the library source code, it is only lightly tested, > so it > > is > > not enabled by default. > > > > To enable MPI_THREAD_MULTIPLE, you need to recompile the library by > first > > including --enable-mpi-threads as one of the parameters when you > rerun > > ./configure as the first step of recompiling the library. > > > > > > > > On 5/27/07, smai...@ksu.edu <smai...@ksu.edu> wrote: > >> > >> Hi, > >> I want to use threads with OpenMPI such that the threads > would > >> be able to call MPI functions. For this purpose, I am using > >> MPI_Init_thread with MPI_THREAD_MULTIPLE option. But this function > call > >> returns MPI_THREAD_SINGLE in the "provided" parameter indicating > that > >> MPI_THREAD_MULTIPLE is not configured. Somewhere it is mentioned > that > >> OpenMPI needs to be configured with --enable-mpi-threads inorder > to use > >> MPI_THREAD_MULTIPLE. If true, is it possible to know whether the > >> OpenMPI (1.1.2)which I have already configured, has the option > >> "--enable-mpi-threads" already configured or not? Also, how easy > or > >> difficult is it to configure --enable-mpi-threads option? > >> Please share some information on this. > >> > >> -Thanks and Regards, > >> Sarang. > >> > >> > >> _______________________________________________ > >> 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 > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > >
