[MPICH] But who is the best between the intercommunicator and intracommunicator?

[Ashley Pittman]

On Fri, 2006-09-15 at 17:40 +0100, Eng. A.A. Isola wrote:
> I have a simple question for you...
> 
> But who is the best between the 
> intercommunicator and intracommunicator?
> 
> Is better use an 
> intercommunicator with Send/Recv or Bcast...
> or is better use the 
> MPI_Intercomm_merge and to use the Send/Recv or Bcast inside the new 
> intracommunicator created?
> 
> I talk about the performance...is more 
> faster the inter or the intracommunicator?
> Do they have the same 
> performance?The same speed?

As a general piece of advice if you don't know that you need to use a
intracommunucator you don't need to use one, they are mostly for corner
cases where a intercommunicator isn't avaliable.

Stick to intercommunicators.

Ashley,