Etienne,
Thank you. I just did what Timo advised (to follow your approach).
It might be out of Dumux hands. If Dune doesn't handle recovering from
the exception and deadlocks before we get back to Dumux, we cannot
really do anything. Here is a paper about this general problem with
MPI and C++ exceptions from the Dune community
(https://arxiv.org/abs/1804.04481).
In this case, the only thing that helps (without implementing some
error propagation framework) is Etienne's suggestion of manually
removing exception throwing where you consider it acceptable failures.
Best regards,
Dmitry
On 6/30/22 10:22, Etienne Ahusborde wrote:
Hi Dmitry ,
We already had the same problem.
We understood that it is due to some "DUNE_THROW" commands.
Our solution (probably not the best) was to remove several
"DUNE_THROW" commands and to replace them with a simple std::cout to
keep the information that something is wrong.
Regards
Etienne
Le 29/06/2022 à 19:36, Dmitry Pavlov a écrit :
Hello,
In one porous flow simulation, I get this message:
Newton iteration 6 done, residual = 3.1654e+13
Solve: M deltax^k = rNewton: Caught exception: "FMatrixError
[luDecomposition:/home/dpavlov/DUMUX/dune-common/dune/common/densematrix.hh:939]:
matrix is singular"
... and it is fine. Matrix can be singular, no objection here. After
this, the Newton solver reports that it did not converge and restarts
with a smaller time step, and eventually it proceeds.
However, when I run the same simulation with MPI, I get this
Newton iteration 8 done, residual = 7.2437e+13
Solve: M deltax^k =
and the program hangs.
So it seems that it misses the singularity in the MPI mode and tries
to proceed with the current time step, to no avail.
How this can be cured?
Best regards,
Dmitry
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