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Subject: [OMPI users] Problem with MPI_Intercomm_create
From: Frédéric Feyel (mcffeyel_at_[hidden])
Date: 2011-06-01 05:00:42


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.