[petsc-dev] mpi_comm_create_group()

Adrian Croucher a.croucher at auckland.ac.nz
Sun Dec 5 16:22:15 CST 2021

On 12/4/21 2:27 AM, Matthew Knepley wrote:
> This seems like hyperbole to me. At worst you need one collective 
> operation to figure out who is in.
> This is no more expensive than one dot product, and probably less. 
> Unless you plan to do this millions
> of times in the simulation, I do not see the dire problem.

OK, I'll stop worrying and learn to love the bomb :-)

- Adrian

Dr Adrian Croucher
Senior Research Fellow
Department of Engineering Science
University of Auckland, New Zealand
email: a.croucher at auckland.ac.nz
tel: +64 (0)9 923 4611

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