The command I use to compile and run is: mpic++ server.cc -o server && mpic++ client.cc -o client && mpirun -np 1 ./server
Rodrigo On Tue, Mar 20, 2012 at 3:40 PM, Rodrigo Oliveira <rsilva.olive...@gmail.com > wrote: > Hi Edgar. > > Thanks for the response. The simplified code is attached: server, client > and a .h containing some constants. I put some "prints" to show the > behavior. > > Regards > > Rodrigo > > > On Tue, Mar 20, 2012 at 11:47 AM, Edgar Gabriel <gabr...@cs.uh.edu> wrote: > >> do you have by any chance the actual or a small reproducer? It might be >> much easier to hunt the problem down... >> >> Thanks >> Edgar >> >> On 3/19/2012 8:12 PM, Rodrigo Oliveira wrote: >> > Hi there. >> > >> > I am facing a very strange problem when using MPI_Barrier over an >> > inter-communicator after some operations I describe bellow: >> > >> > 1) I start a server calling mpirun. >> > 2) The server spawns 2 copies of a client using MPI_Comm_spawn, creating >> > an inter-communicator between the two groups. The server group with 1 >> > process (lets name it as A) and the client group with 2 processes >> (group B). >> > 3) After that, I need to detach one of the processes (rank 0) in group B >> > from the inter-communicator AB. To do that I do the following steps: >> > >> > Server side: >> > ..... >> > tmp_inter_comm = client_comm.Create ( client_comm.Get_group ( ) >> ); >> > client_comm.Free ( ); >> > client_comm = tmp_inter_comm; >> > ..... >> > client_comm.Barrier(); >> > ..... >> > >> > Client side: >> > .... >> > rank = 0; >> > tmp_inter_comm = server_comm.Create ( server_comm.Get_group ( >> > ).Excl ( 1, &rank ) ); >> > server_comm.Free ( ); >> > server_comm = tmp_inter_comm; >> > ..... >> > if (server_comm != MPI::COMM_NULL) >> > server_comm.Barrier(); >> > >> > >> > The problem: everything works fine until the call to Barrier. In that >> > point, the server exits the barrier, but the client at the group B does >> > not. Observe that we have only one process inside B, because I used Excl >> > to remove one process from the original group. >> > >> > p.s.: This occurs in the version 1.5.4 and the C++ API. >> > >> > I am very concerned about this problem because this solution plays a >> > very important role in my master thesis. >> > >> > Is this an ompi problem or am I doing something wrong? >> > >> > Thanks in advance >> > >> > Rodrigo Oliveira >> > >> > >> > _______________________________________________ >> > 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 >> > >
