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
