Dear George, Dear Gilles, Dear Jeff, Deal all,
Thank for all the suggestions.
The problem is that I do not want to FINALIZE, but only to exit from a
cycle.
This is my code:
I have:
master_group;
each master sends to its slaves only some values;
the slaves perform something;
according to a counter,
Diego,
first, try using MPI_IN_PLACE when sendbuffer and recvbuffer are identical
at first glance, the second allreduce should be in MPI_COMM_WORLD (with
counter=0 when master_comm is null),
or you have to add an extra broadcast in local_comm
Cheers,
Gilles
On 8/20/2018 3:56 PM, Diego
