Multiple communicators

Matthew Knepley knepley at
Tue Nov 24 19:03:00 CST 2009

On Tue, Nov 24, 2009 at 6:59 PM, <irfan.khan at> wrote:

> Hello
> Does the procedure for providing command line options and to obtain
> profiling data through -log_summary change if there are multiple MPI
> communicators in a petsc code?

There is always WORLD, so it should be fine unless I misunderstand your


> If so, can somebody point me to information, references on how to provide
> command line options if there are multiple communicators?
> Thank you
> Irfan
> --
> PhD Candidate
> G.W. Woodruff School of Mechanical Engineering
> Georgia Institute of Technology
> Atlanta, GA (30332)

What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
-- Norbert Wiener
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