[petsc-users] DMDA with dimension of size 1

[Patrick Sanan]

Meshes of size 1 should work.

Looks like there is a bug in the code to produce this error message (patch
for maint attached). It's not outputting the "P" (size in the 3rd
dimension) component.

This is just speculation without a full error message or code to reproduce,
but perhaps the size in the third dimension is an uninitialized value which
is triggering this warning with a 10 x 10 x (huge garbage) x 1 (dof) mesh.

Am Mo., 1. Okt. 2018 um 15:59 Uhr schrieb Phil Tooley <
phil.tooley at sheffield.ac.uk>:

> Hi all,
>
> Is it valid to have a DMDA with one of the dimensions of size 1.  I was
> hoping to avoid having to write explicit logic to handle the case that I
> am working on a 2D rather than a 3D image for my current application.
> Unfortunately when I try to construct such a DMDA I get an error:
>
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Overflow in integer operation:
> [0]PETSC ERROR: Mesh of 10 by 10 by 1 (dof) is too large for 32 bit indices
>
> Is there a workaround other than "write everything twice"?
>
> Thanks
>
> Phil
>
> --
> Phil Tooley
> Research Software Engineering
> University of Sheffield
>
>
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