[petsc-users] Max color value exeeds 65535 limit

[Florian Kauer]

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.

[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