When you MPI_COMM_SPAWN, the parent and children processes are said to be "connected". And MPI_FINALIZE is collective across all connected processes (see the definition of MPI_FINALIZE in MPI-2.2).
If you want to disconnect the spawned children from the parents, use MPI_COMM_DISCONNECT. Then the two sets of processes will be able to MPI_FINALIZE separately. http://www.open-mpi.org/doc/v1.5/man3/MPI_Comm_spawn.3.php http://www.open-mpi.org/doc/v1.5/man3/MPI_Finalize.3.php http://www.open-mpi.org/doc/v1.5/man3/MPI_Comm_disconnect.3.php On Aug 31, 2011, at 8:35 PM, Mateus Augusto wrote: > Hello, > > I have three processes that communicate with each other. The first process > creates the other two processes (using MPI_Comm_spaw (...)). > When one of the processes performs MPI_Finalize (), it continues in > execution, stopped in MPI_Finalize function () (in busy waiting, ie, using > CPU) and just executes the next instruction only when the other two processes > run MPI_Finalize (). It seems that MPI_Finalize () behaves like MPI_Barrier > (). This behavior only occurs when processes communicate with each other > (when, for example, use MPI_Send, MPI_Isend, MPI_Bsend. or MPI_Ssend). > I would like to know if we can avoid this behavior of MPI_Finalize when > processes communicate with each other. > > Here there are the codes: > > Process Master: > > #include <stdio.h> > #include <stdlib.h> > #include <string.h> > #include <mpi.h> > > int main(int argc, char** argv) { > int i; > char other[200]; > getcwd(other, 199); > strcat(other, "/otherProcess"); > MPI_Init(&argc, &argv); > MPI_Comm com; > MPI_Status s; > MPI_Comm_spawn(other, MPI_ARGV_NULL, 2, MPI_INFO_NULL, 0, MPI_COMM_WORLD, > &com, MPI_ERRCODES_IGNORE); > MPI_Recv(&i, 1, MPI_INT, 0, 0, com, &s); > sleep(15); // Make the otherProcess wait the Master process in > MPI_Finalize(). > MPI_Finalize(); > return 0; > } > > Other Process (process Master calls otherProcess): > > #include <stdio.h> > #include <stdlib.h> > #include <mpi.h> > > int main(int argc, char * argv[]) { > int dest; > MPI_Comm parent; > MPI_Init(&argc, &argv); > MPI_Comm_get_parent(&parent); > MPI_Send(&dest, 1, MPI_INT, 0, 0, parent); // If this line is removed, > the process doesn't stop in MPI_Finalize. > printf("Before MPI_Finalize\n"); > MPI_Finalize(); // The process stay here waiting all process execute > MPI_Finalize. > printf("After MPI_Finalize\n"); > return 0; > } > > I've tried several things but nothing worked. I don't want that otherProcess > stay waiting in MPI_Finalize(). > Could someone help-me? > > Thanks. > > > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
