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From: Graham E Fagg (fagg_at_[hidden])
Date: 2006-09-15 13:09:48


> 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?

Usually they do not have the same implementation due to differences in
semmantics, the intercommunications can use highly optimized algorithms
used in intracommunications but generally don't.

It is currently better in Open MPI to
do a merge and use intracommunications.

Thanks,
   Graham.
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Dr Graham E. Fagg | Distributed, Parallel and Meta-Computing
Innovative Computing Lab. PVM3.4, HARNESS, FT-MPI & Open MPI
Computer Science Dept | Suite 203, 1122 Volunteer Blvd,
University of Tennessee | Knoxville, Tennessee, USA. TN 37996-3450
Email: fagg_at_[hidden] | Phone:+1(865)974-5790 | Fax:+1(865)974-8296
Broken complex systems are always derived from working simple systems
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>
> Bye
>
> Alfonso
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>

Thanks,
         Graham.
----------------------------------------------------------------------
Dr Graham E. Fagg | Distributed, Parallel and Meta-Computing
Innovative Computing Lab. PVM3.4, HARNESS, FT-MPI, SNIPE & Open MPI
Computer Science Dept | Suite 203, 1122 Volunteer Blvd,
University of Tennessee | Knoxville, Tennessee, USA. TN 37996-3450
Email: fagg_at_[hidden] | Phone:+1(865)974-5790 | Fax:+1(865)974-8296
Broken complex systems are always derived from working simple systems
----------------------------------------------------------------------