[aspect-devel] Aspect hangs after several time steps

[Lev Karatun]

Hi Timo,

I have found a good setup that reproduces the problem (after fixing the
error that I had, that is). On both 8 cores and 1 core the simulation stops
on time step 59. I attached the necessary files.

Best regards,
Lev Karatun.

2016-01-26 5:15 GMT-05:00 Lev Karatun <lev.karatun at gmail.com>:

> 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
>> > http://lists.geodynamics.org/cgi-bin/mailman/listinfo/aspect-devel
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>
>
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