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From: Code Master (cpp.codemaster_at_[hidden])
Date: 2007-05-26 22:23:28


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, smairal_at_[hidden] <smairal_at_[hidden]> 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.
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