mary sweat <[email protected]> writes:

> Hi all,  I need to know how does KSP separate and distribute domain
> between processes and the way processes share and communicate halfway
> results. Is there any good documentation about it???

The communication is in Mat and Vec functions.  You can see it
summarized in -log_summary.  For the underlying theory, see Barry's
book.

http://www.mcs.anl.gov/~bsmith/ddbook.html

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