[petsc-users] Understanding DMPlexDistribute overlap

[Michael Lange]

Hi Francesco,

Ok, I can confirm that your test runs fine for me with the latest master 
branch. I'm attaching the log for two processes up to overlap 7, where 
the entire mesh is effectively replicated on each partition. The command 
I ran was:

for OL in 1 2 3 4 5 6 7; do mpiexec -np 2 python overlay-test.py -o $OL; 
done

Looks like this might be a problem with your local build. Can you please 
try and update to the latest master?

Hope this helps,

Michael


On 06/04/17 10:25, Francesco Caimmi wrote:
> Dear Matt,
>
> thanks for your reply.
>
> On mercoledì 5 aprile 2017 21:09:43 CEST Matthew Knepley wrote:
>> On Wed, Apr 5, 2017 at 6:03 AM, Francesco Caimmi <francesco.caimmi at polimi.it
>>> [...]
>>> the program fails with the error message captured in the attached file
>>> error.log. Changing the number of processors does not alter the behavior.
>>> Note
>>> also that the same holds if I use a mesh generated by DMPlexCreateBoxMesh.
>> Francesco, I will reproduce your problem, but it may take me a few days.
> Thank you very much for your time.
>
>> It is strange since we have tests for overlap > 1 that do use
>> CreateBoxMesh. For example,
>>
>>    cd src/dm/impls/plex/examples/tests
>>    make ex12
>>    mpiexec -n 8 -test_partition -overlap 2 -dm_view ::ascii_info_detail
> Anyway, there might be something related to my install: for the records, if I
> do
>
> $cd src/dm/impls/plex/examples/tests
> $make ex12
>
> I get
>
>   /home/fcaimmi/Packages/petsc/my-linux-petsc/bin/mpicc     ex12.c   -o ex12
> ex12.c:3:25: fatal error: petscdmplex.h: No such file or directory
>   #include <petscdmplex.h>
>                           ^
> compilation terminated.
> <builtin>: recipe for target 'ex12' failed
> make: *** [ex12] Error 1
>
> I get this error I cannot explain ( I am not that much into PETSc build
> system, I mostly use the python bindings), since for example I can
> successfully build ex1.c or ex3.c which of course contain the same include
> statement...
>
> I don't know if this is useful to track the issue, but hope it helps.
>
> Thank you again,
> FC
>

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