Hello, You need to call MPI_Init before calling MPI_Init_thread.
According to http://cw.squyres.com/columns/2004-02-CW-MPI-Mechanic.pdf (Past MPI Mechanic Columns written by Jeff Squyres) only 3 functions that can be called before calling MPI_Init and they are: - MPI_Initialized - MPI_Finalized - MPI_Get_version This information is also listed in Section 8.7 (page 291) in the MPI 2.2 book ( http://www.mpi-forum.org/docs/mpi-2.2/mpi22-report.pdf ). Sébastien http://github.com/sebhtml/ray > ________________________________________ > De : users-boun...@open-mpi.org [users-boun...@open-mpi.org] de la part de > devendra rai [rai.deven...@yahoo.co.uk] > Date d'envoi : 19 septembre 2011 04:15 > À : Open MPI Users > Objet : [OMPI users] Problems with MPI_Init_Thread(...) > > Hello Community, > > I am building an application which uses MPI_Ssend(...) and MPI_Recv(...) in > threads. So, there is more than one thread which invokes MPI functions. > > Based on Jeff's inputs, I rebuilt open-mpi with threads support: > > ./configure --enable-mpi-threads=yes --with-threads=posix ... > > I believe the above line would do the magic. > > Now, I learnt that I need to request thread support when initializing MPI > application using MPI_Init_thread(...). This is my code fragment: > > int main(int argc, char *argv[]) > { > int rank; > int desired_thread_support = MPI_THREAD_MULTIPLE; > int provided_thread_support; > > MPI_Init_thread(&argc, &argv, desired_thread_support, > &provided_thread_support); > > MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN); > > > I build my application, and run it on 3 nodes. However, I get this error: > > Sun Sep 18 22:25:11 2011[1,1]<stderr>:*** The MPI_Init_thread() function was > called before MPI_INIT was invoked. > Sun Sep 18 22:25:11 2011[1,1]<stderr>:*** This is disallowed by the MPI > standard. > Sun Sep 18 22:25:11 2011[1,1]<stderr>:*** Your MPI job will now abort. > Sun Sep 18 22:25:11 2011[1,1]<stderr>:[Morpheus.OTZ:9910] Abort before > MPI_INIT completed successfully; not able to guarantee that all other > processes were killed! > > I did read some online examples, and API documentations, and nothing says > that I will need to call MPI_Init(...) *followed by* MPI_Init_thread(...). > > I have open-mpi 1.4.3 from open-mpi official site, running on Linux kernel > 2.6.37.6-0.7. > > I do not understand why this error is happening. > > Again, the next question is, Am I required to MPI_Init_thread everytime I > create a new thread? If yes, will this call be the first line in the thread? > > Would be nice if someone can throw some pointers. > > Thanks a lot. > > Best, > > Devendra Rai > > ________________________________ > >
