[petsc-users] Non conforming object sizes

[Matthew Knepley]

On Tue, Jul 9, 2013 at 10:24 AM, Thomas DE-SOZA <thomas.de-soza at edf.fr>wrote:

>
> Dear PETSc users,
>
> We're having difficulties troubleshooting some developments in our code
> that relies on PETSc. We're assembling a matrix of size 90 with the
> blocksize set to 6, the code is run on two processors so that processor #0
> has 48 entries and #1 has 42 entries.
> During the MatAssemblyEnd, an error about non conforming object sizes is
> thrown ("Local scatter sizes don't match"). This is raised by
> VecScatterCreate inside MatAssemblyEnd.
>
> We're likely doing something wrong but what would be the way to debug this
> since the call to VecScatterCreate is not controlled directly by us ?
> Attached is the output of '-info' during the MatAssemblyEnd.
>

I think you are overwriting memory. This condition should be impossible
with that code path, so some memory is likely getting garbaged. Please run
under
valgrind.


> Note : we're still using PETSc 3.2p7 and have not moved to 3.4.
>

Change that.

   Matt


> Thanks,
>
> Thomas
>
>
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