[petsc-users] MatChop

[Stefano Zampini]

Emmanuel

thanks for reporting this.
I believe we have a regression in MatChop from
https://gitlab.com/petsc/petsc/-/commit/038df967165af8ac6c3de46a36f650566a7db07c
(cc'ing Pierre)
We call MatAssemblyBegin/End within the row loop. Also. I don't understand
why we need to check for  r < rend herre
https://gitlab.com/petsc/petsc/-/blob/038df967165af8ac6c3de46a36f650566a7db07c/src/mat/utils/axpy.c#L513.
nor why we need to allocate newCols (can use cols)

Pierre, can you take a look?

Il giorno ven 21 mag 2021 alle ore 18:49 Emmanuel Ayala <juaneah at gmail.com>
ha scritto:

> Hi everybody,
>
> I just updated petsc from version 13 to 15. Before the update everything
> works well, then my code give me an error:
>
> [9]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [9]PETSC ERROR: Invalid argument
> [9]PETSC ERROR: Setting off process row 53484 even though
> MatSetOption(,MAT_NO_OFF_PROC_ENTRIES,PETSC_TRUE) was set
> [9]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html
> for trouble shooting.
> [9]PETSC ERROR: Petsc Release Version 3.15.0, Mar 30, 2021
> [9]PETSC ERROR: ./comp on a arch-linux-c-opt-O2-superlud_mumps_hyp named
> eayala by ayala Fri May 21 10:40:36 2021
> [9]PETSC ERROR: Configure options --with-debugging=0 COPTFLAGS="-O2
> -march=native -mtune=native" CXXOPTFLAGS="-O2 -march=native -mtune=native"
> FOPTFLAGS="-O2 -march=native -mtune=native" --download-mpich
> --download-hypre --download-mumps --download-scalapack --download-parmetis
> --download-metis --download-superlu_dist --download-cmake
> --download-fblaslapack=1 --with-cxx-dialect=C++11
>
> The error appears after a matrix assembly, the matrix was created with
> DMCreateMatrix and updated with MatSetValuesLocal.
>
> A Little work around I found the solution, avoid using MatChop on this
> matrix, but I still need to use MatChop. There is any reason to have this
> problem?
>
> Thanks in advance.
>
>
>
>
>

-- 
Stefano
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