[petsc-users] Correlation between da_refine and pg_mg_levels

[Justin Chang]

BTW what are the relevant papers that describe this problem? Is this one

http://epubs.siam.org/doi/abs/10.1137/110834512


On Mon, Apr 3, 2017 at 1:04 PM Justin Chang <jychang48 at gmail.com> wrote:

> So my makefile/script is slightly different from the tutorial directory.
> Basically I have a shell for loop that runs the 'make runex48' four times
> where -da_refine is increased each time. It showed Levels 1 0 then 2 1 0
> because the job was in the middle of the loop, and I cancelled it halfway
> when I realized it was returning errors as I didn't want to burn any
> precious SU's :)
>
> Anyway, I ended up using Edison with 16 cores/node and Cori/Haswell with
> 32 cores/node and got some nice numbers for 128x128x16 coarse grid. I am
> however having issues with Cori/KNL, which I think has more to do with how
> I configured PETSc and/or the job scripts.
>
> On Mon, Apr 3, 2017 at 6:23 AM, Jed Brown <jed at jedbrown.org> wrote:
>
> Matthew Knepley <knepley at gmail.com> writes:
> > I can't think why it would fail there, but DMDA really likes old numbers
> of
> > vertices, because it wants
> > to take every other point, 129 seems good. I will see if I can reproduce
> > once I get a chance.
>
> This problem uses periodic boundary conditions so even is right, but
> Justin only defines the coarsest grid and uses -da_refine so it should
> actually be irrelevant.
>
>
>
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