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.
