[aspect-devel] Aspect hangs after several time steps

[Lev Karatun]

Hi Timo,

I composed a lengthy email with answers to your questions, but then I
realized I have a mistake in boundary conditions, so now I need a bit more
time to explore if the fixed ones work correctly.

Thank you for you help.

Best regards,
Lev Karatun.

2016-01-25 7:09 GMT-05:00 Timo Heister <timo.heister at gmail.com>:

> Lev,
>
> I'm not sure what could cause a hang like you observe. Your first goal
> should be to make this problem reproducible as quickly as possible
> with the smallest number of processors.
>
> > Disabling free surface (changing the top boundary to free-slip) makes
> the simulation hang after 1 time step
>
> This is great. How many cores do you need to have this happen? If you
> can reduce it further? Does this happen with any of the included
> cookbooks? If not, please share your input file and all details
> (number of cores, when it hangs, etc.).
>
>
> On Mon, Jan 25, 2016 at 12:01 PM, Lev Karatun <lev.karatun at gmail.com>
> wrote:
> > Hi,
> >
> > (I already reported the problem last year
> > (
> http://lists.geodynamics.org/pipermail/aspect-devel/2015-June/000919.html
> ),
> > but at that moment it wasn't as severe. Now I moved to the higher
> resolution
> > models and it has gotten much worse)
> >
> > The problem is - Aspect hangs after a (seemingly) random timestep without
> > producing any error. I ran several tests in attempts to narrow down the
> > problem, and this is what I found:
> > - Neither assigning a value to $TMP/$TMPDIR or adding a "Number of
> grouped
> > files" parameter helps
> > - Disabling visualization postprocessor doesn't help
> > - Running Apsect in development mode produced the same results: hanging
> > without any error messages
> > - Restarting the hanging simulation from a checkpoint helps partially, it
> > goes past the timestep at which in hung, but then after it hangs again
> > - Disabling free surface (changing the top boundary to free-slip) makes
> the
> > simulation hang after 1 time step
> > - Changing CFL number affects how long the simulation runs before
> hanging:
> > at 0.05 is hangs at timestep 13, at 0.1 - 56, at 0.2 it ran without
> hanging
> > up to time step 153 (with disabled visualization though)
> >
> > Could you please help me solve this problem? It's really hurting the
> > progress of my research.
> > Thanks in advance!
> >
> > Best regards,
> > Lev Karatun.
> >
> > _______________________________________________
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> > Aspect-devel at geodynamics.org
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