[aspect-devel] Aspect hangs after several time steps

[Timo Heister]

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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