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.
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,
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