Since your new intra-communicator contains all members, couldn't you just use the MPI_COMM_WORLD communicator?
2011/6/1 Frédéric Feyel <mcffe...@free.fr>: > Hello, > > I have a problem using MPI_Intercomm_create. > > I 5 tasks, let's say T0, T1, T2, T3, T4 resulting from two spawn > operations by T0. > > So I have two intra-communicator : > > intra0 contains : T0, T1, T2 > intra1 contains : T0, T3, T4 > > my goal is to make a collective loop to build a single intra-communicator > containing T0, T1, T2, T3, T4 > > I tried to do it using MPI_Intercomm_create and MPI_Intercom_merge calls, > but without success (I always get MPI internal errors). > > What I am doing : > > on T0 : > ******* > > MPI_Intercom_create(intra0,0,intra1,0,1,&new_com) > > on T1 and T2 : > ************** > > MPI_Intercom_create(intra0,0,MPI_COMM_WORLD,0,1,&new_com) > > on T3 and T4 : > ************** > > MPI_Intercom_create(intra1,0,MPI_COMM_WORLD,0,1,&new_com) > > > I'm certainly missing something. Could anybody help me to solve this > problem ? > > Best regards, > > Frédéric. > > PS : of course I did an extensive web search without finding anything > usefull on my problem. > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- David Zhang University of California, San Diego
