[aspect-devel] Problems with recent deal.ii

[Timo Heister]

Dear Ian,

Could this be related to r29539 ?
http://dealii.org/websvn/revision.php?repname=deal.II+Repository&path=%2F&rev=29539&peg=29539
On Jul 1, 2013 5:50 PM, "Ian Rose" <ian.rose at berkeley.edu> wrote:

> H
> i all,
> Here's a bit of a doozy of a problem.  I noticed the other day a sharp
> increase in the number of iterations aspect required for the Stokes solver
> to converge.  As in, the cheap solver never converges, and the expensive
> one takes ~50-200 iterations.  After a bunch of experimentation, I think it
> may be due to some recent changes in deal.ii.  If I run
> simple_2d_shells.prm on 8 cores with deal.ii 7.3.0, I get the following
> representative output:
>
> *** Timestep 148:  t=4.6211e+06 years
>    Solving temperature system... 13 iterations.
>    Solving Stokes system... 13 iterations.
>
> If, however, I run it using deal.ii r29892 I get the following
>
> *** Timestep 27:  t=2.68009e+06 years
>    Solving temperature system... 13 iterations.
>    Solving Stokes system... 30+219 iterations.
>
> I have no idea what may be causing this, or how reproducible it is across
> different systems (though I have noticed the same increase in iterations on
> TACC Stampede).  In both cases, I am using trilinos 11.2.3 and p4est 0.3.4.
>  Everything is built with icc-12.1, mkl math libraries, and using myrinet
> MPI.  Any insight would be greatly appreciated.
> Best,
> Ian
>
>
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