[FLASH-USERS] Flash not progressing after 'Initial dt verified'

[Ryan Farber]

Hi Gabriel,

I have encountered (and am to some extent still trying to understand) a
similar, possibly the same, issue (also with FLASH 4.8). I think the usual
issue I encounter is caused due to running out of memory, but it may also
be related to HDF5...

Regarding your issue, does the run just stall? Such that ps aux | grep
flash shows the process is running but the simulation makes no progress in
outputting to your log file or STDOUT/STDERR file(s)?

Or does the run die? [Some error is encountered / ps no longer shows the
process or it's in a completing, i/o, or zombie state.]

It would be helpful if you can attach your log file and your STDOUT/STDERR
file(s). It would also be useful if you try using +noio to determine if you
have an HDF5 issue, and -debug to provide a traceback if an exception is
raised.

It's interesting this happened for you just changing distributions. I'm
hoping you re-installed openmpi, hdf5, etc. on the new OS rather than
copying your installations from your old OS(?)

Best wishes,
--------
Ryan


On Tue, Oct 15, 2024 at 2:51 AM Gabriel Pérez Callejo <
gabriel.perez.callejo at uva.es> wrote:

> Dear all,
>
> I have been using FLASH for a while in Ubuntu 18, and am moving now to use
> the linux distribution OpenSUSE. However, when running flash in parallel
> mode, I am encountering the following problem.
>
> I am testing the LaserSlab example, with FLASH4.6.2, using hdf5-1.10.7,
> hypre-2.11.2 and openmpi-4.0.5 (same as I used in Ubuntu 18).
>
> I am launching the simulation by using *"./setup -auto LaserSlab -2d
> +cylindrical -nxb=16 -nyb=16 +hdf5typeio species=cha*
> *m,targ +mtmmmt +laser +uhd3t +mgd mgd_meshgroups=6 -parfile=example.par" *then
> moving to the *object* directory, using *"make -j"* and after SUCCESS
> running "*mpirun -np 3 flash4"*.
>
> Now, this is what I used to do in Ubuntu, but what I am finding in this
> case is that the calculation is initialized, but after printing *"Initial
> dt verified" *nothing else happens. The code does not move forward. I can
> see that the chk_0000 file has been generated, but not the plt_0000.
>
> Has anyone encountered this problem before? Does anyone have any
> suggestions on how to fix it?
>
> Best,
> --
> *Gabriel Pérez-Callejo*
> Profesor Ayudante Doctor (Assistant Professor)
> Departamento de Física Teórica, Atómica y Óptica
> Universidad de Valladolid
> Valladolid, Spain
> +34 983 18 6513
>
>
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