[petsc-users] Question about GAMG and memory use

Jed Brown jed at jedbrown.org
Thu Mar 5 13:28:58 CST 2015

Please keep the list Cc'd.

Randall Mackie <rlmackie862 at gmail.com> writes:

>> On Mar 5, 2015, at 11:17 AM, Jed Brown <jed at jedbrown.org> wrote:
>> Barry Smith <bsmith at mcs.anl.gov> writes:
>>>  This should not happen, probably you are working with a MPIAIJ
>>>  matrix
>> Randall, it sounds like you are creating an MPIAIJ matrix even in
>> serial.  Meanwhile, GAMG creates a SeqAIJ prolongation operator (when
>> running in serial).  Why are you creating an MPIAIJ matrix in serial?
>> (Maybe you have MATMPIAIJ where it could be MATAIJ?)
> Well, I am creating an MPIAIJ matrix because that's what I've used for years, and it's never been a problem when I've tested on 1 process before, but then it's only been recently that I've been using GAMG for this particular solve.
> I will switch to MATAIJ and try again.

Thanks.  Avoiding over-specification is good.
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