[petsc-dev] Jed!!!

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

>    Mat nest is just an optimization. That, BTW makes it impossible to do the simplest tests of your code!!

It is intended to be used with MatGetLocalSubMatrix and
MatSetValuesLocal.  It would be significant complexity (including memory
scalability) to support MatSetValues, and supporting that mode would
encourage people to write code that needs refactoring to perform.  At
least that was my thinking.  If you are assembling with a global
MatSetValues, MATNEST doesn't offer much so just don't use it.

How do you want to change this?

> [0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> [0]PETSC ERROR: No support for this operation for this object type
> [0]PETSC ERROR: Mat type nest
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
> [0]PETSC ERROR: Petsc Development GIT revision: v3.4.4-4136-gd798c81  GIT Date: 2014-04-25 16:33:06 -0500
> [0]PETSC ERROR: ./ogs on a arch-mpich named es by bsmith Sat Apr 26 18:11:09 2014
> [0]PETSC ERROR: Configure options --download-metis --download-parmetis --download-superlu_dist LIBS=/usr/lib/libmpl.a PETSC_ARCH=arch-mpich --download-hypre
> [0]PETSC ERROR: #1 MatSetValues() line 1117 in /sandbox/bsmith/petsc/src/mat/interface/matrix.c
> [0]PETSC ERROR: #2 SNESComputeJacobianDefault() line 120 in /sandbox/bsmith/petsc/src/snes/interface/snesj.c
> [0]PETSC ERROR: ------------------------------------------------
> #3 SNESSolve_Test() line 64 in /sandbox/bsmith/petsc/src/snes/impls/test/snestest.c
> [0]PETSC ERROR: #4 SNESSolve() line 3794 in /sandbox/bsmith/petsc/src/snes/interface/snes.c
> CPU time elapsed in this process: 31.72s
>
>   Very annoying. Makes me feel like I’m using trilinos
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