[petsc-users] Max color value exeeds 65535 limit

[Matthew Knepley]

On Tue, Aug 14, 2018 at 10:12 AM Florian Kauer <florian.kauer at koalo.de>
wrote:

> Hi,
> I was just testing out if my calculations also work for several 10000
> variables and got the following error. Is this a fundamental limit with
> very large (or complex) systems of equations or does it hint to a bug/wrong
> configuration in my program? Everything works fine for smaller systems.
>

This is an artificial limit. However, you probably do not want to use that
coloring. Is this matrix sparse?
If so, I would try the greedy coloring based on the AIJ pattern.

  Thanks,

    Matt


> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Argument out of range
> [0]PETSC ERROR: Max color value exeeds 65535 limit. This number is
> unrealistic. Perhaps a bug in code?
> Current max: 65535 user rewuested: 65536
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
> for trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.8.4, unknown
> [0]PETSC ERROR: ./csma_model on a linux-gnu-c-debug named h3a-srv-crunchie
> by cto7138 Tue Aug 14 15:59:57 2018
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --with-fc=gfortran --download-mpich --download-fblaslapack
> [0]PETSC ERROR: #1 ISColoringCreate() line 268 in
> /home/cto7138/petsc/src/vec/is/is/utils/iscoloring.c
> [0]PETSC ERROR: #2 MatColoringPatch_SeqAIJ_Inode() line 2715 in
> /home/cto7138/petsc/src/mat/impls/aij/seq/inode.c
> [0]PETSC ERROR: #3 MatColoringPatch() line 7566 in
> /home/cto7138/petsc/src/mat/interface/matrix.c
> [0]PETSC ERROR: #4 MatColoringApply_SL() line 101 in
> /home/cto7138/petsc/src/mat/color/impls/minpack/color.c
> [0]PETSC ERROR: #5 MatColoringApply() line 360 in
> /home/cto7138/petsc/src/mat/color/interface/matcoloring.c
> [0]PETSC ERROR: #6 SNESComputeJacobianDefaultColor() line 81 in
> /home/cto7138/petsc/src/snes/interface/snesj2.c
> [0]PETSC ERROR: #7 SNESComputeJacobian() line 2360 in
> /home/cto7138/petsc/src/snes/interface/snes.c
> [0]PETSC ERROR: #8 SNESSolve_NEWTONLS() line 222 in
> /home/cto7138/petsc/src/snes/impls/ls/ls.c
> [0]PETSC ERROR: #9 SNESSolve() line 4131 in
> /home/cto7138/petsc/src/snes/interface/snes.c
> [0]PETSC ERROR: #10 main() line 401 in
> /home/cto7138/evaluation/analyticalmultihop/src/csma_model/csma_model.cpp
> [0]PETSC ERROR: PETSc Option Table entries:
> [0]PETSC ERROR: --experiment
> /home/cto7138/evaluation/results/analytical-csma/inverse-model/21341_95/000/experiment_CSMA.json
> [0]PETSC ERROR: ----------------End of Error Message -------send entire
> error message to petsc-maint at mcs.anl.gov----------
>
> Greetings,
> Florian
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20180814/57d9134c/attachment.html>