> On 1 Nov 2023, at 3:33 PM, Zhang, Hong via petsc-users
> <[email protected]> wrote:
>
> Victoria,
> "** Maximum transversal (ICNTL(6)) not allowed because matrix is distributed
> Ordering based on METIS"
This warning is benign and appears for every run using a sequential partitioner
in MUMPS with a MATMPIAIJ.
(I’m not saying switching to ParMETIS will not make the issue go away)
Thanks,
Pierre
$ ../../../../arch-darwin-c-debug-real/bin/mpirun -n 2 ./ex2 -pc_type lu
-mat_mumps_icntl_4 2
Entering DMUMPS 5.6.2 from C interface with JOB, N = 1 56
executing #MPI = 2, without OMP
=================================================
MUMPS compiled with option -Dmetis
MUMPS compiled with option -Dparmetis
MUMPS compiled with option -Dpord
MUMPS compiled with option -Dptscotch
MUMPS compiled with option -Dscotch
=================================================
L U Solver for unsymmetric matrices
Type of parallelism: Working host
****** ANALYSIS STEP ********
** Maximum transversal (ICNTL(6)) not allowed because matrix is distributed
Processing a graph of size: 56 with 194 edges
Ordering based on AMF
WARNING: Largest root node of size 26 not selected for parallel
execution
Leaving analysis phase with ...
INFOG(1) = 0
INFOG(2) = 0
[…]
> Try parmetis.
> Hong
> From: petsc-users <[email protected]> on behalf of Victoria
> Rolandi <[email protected]>
> Sent: Tuesday, October 31, 2023 10:30 PM
> To: [email protected] <[email protected]>
> Subject: [petsc-users] Error using Metis with PETSc installed with MUMPS
>
> Hi,
>
> I'm solving a large sparse linear system in parallel and I am using PETSc
> with MUMPS. I am trying to test different options, like the ordering of the
> matrix. Everything works if I use the -mat_mumps_icntl_7 2 or
> -mat_mumps_icntl_7 0 options (with the first one, AMF, performing better than
> AMD), however when I test METIS -mat_mumps_icntl_7 5 I get an error (reported
> at the end of the email).
>
> I have configured PETSc with the following options:
>
> --with-cc=mpiicc --with-cxx=mpiicpc --with-fc=mpiifort
> --with-scalar-type=complex --with-debugging=0 --with-precision=single
> --download-mumps --download-scalapack --download-parmetis --download-metis
>
> and the installation didn't give any problems.
>
> Could you help me understand why metis is not working?
>
> Thank you in advance,
> Victoria
>
> Error:
>
> ****** ANALYSIS STEP ********
> ** Maximum transversal (ICNTL(6)) not allowed because matrix is distributed
> Processing a graph of size: 699150 with 69238690 edges
> Ordering based on METIS
> 510522 37081376 [100] [10486 699150]
> Error! Unknown CType: -1
