[aspect-devel] A weird error with MPI postprocessing

[FELIPE ORELLANA ROVIROSA]

 Hello Shangxin,

    My name is Felipe, I am a PhD student.

    I am learning how to run Aspect, in parallel.

    On average, what percentage of the Aspect output files (pvtu for
example)
 can you actually and successfully read in Paraview? I mean with no errors.

    I know errors can come from the cluster one is using, but also from
bugs in the software; so it's hard to keep track, and also hard and tedious
to advance..

    I am honestly feeling a little bit discouraged on all this effort I
have put in Aspect. It's just that I can hardly advance on my research., I
have tons of models I wanna run, but I hardly succeed..

cheers,

Felipe

On Sun, Feb 28, 2016 at 9:06 PM, Shangxin Liu <sxliu at vt.edu> wrote:

> Hi;
>
> Recently, when I'm running the time-dependent cases, sometimes the jobs
> will fail at the postprocessing part after running more than ~20 hours. I
> paste the error here (from one of my cases):
>
> ----------------------------------------------------
>
> Exception on MPI process <76> while running postprocessor
> <N6aspect11Postprocess13VisualizationILi3EEE>:
>
>
> --------------------------------------------------------
>
> An error occurred in line <6156> of file
> </home/shangxin/sources/dealii/source/base/data_out_base.cc> in function
>
>     void dealii::DataOutInterface<dim,
> spacedim>::write_vtu_in_parallel(const char*, MPI_Comm) const [with int dim
> = 3; int spacedim = 3; MPI_Comm = ompi_communicator_t*]
>
> The violated condition was:
>
>     err==0
>
> The name and call sequence of the exception was:
>
>     ExcMessage("Unable to open file with MPI_File_open!")
>
> Additional Information:
>
> Unable to open file with MPI_File_open!
>
> --------------------------------------------------------
>
>
> Aborting!
>
> ----------------------------------------------------
>
> This error often appears after running dozens of hours so it's hard to
> debug in short time test. It seems that this error is related with writing
> the visualization postprocess output to files. But if so, it means that
> after some time step the postprocessing output can proceed but after
> another certain time step the postprocessing will not work (In my case, the
> code crashed at the time step ~3000 postprocessing). I'm using the ASPECT
> and dealii from git hub and didn't modify anything in the postprocessing
> code.
>
> Any idea why this problem appears and how to solve it?
>
> Best,
> Shangxin
>
>
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