[petsc-users] MatAssemblyEnd taking too long

[Stefano Zampini]

> On Aug 20, 2020, at 5:59 PM, Manav Bhatia <bhatiamanav at gmail.com> wrote:
> 
> 
> 
>> On Aug 20, 2020, at 8:31 AM, Stefano Zampini <stefano.zampini at gmail.com <mailto:stefano.zampini at gmail.com>> wrote:
>> 
>> ((Mat_SeqAIJ*)aij->B->data)->nonew
>> mat->was_assembled
>> aij->donotstash
>> mat->nooffprocentries
>> 
> 
> The values for the last three variables are all False on all 8 processes. 

Thanks, it seems a bug in MPI or on our side. As Matt said, can you run with -matstash_legacy? Also, make sure to run with a debug version of PETSc (configure using —with-debugging=1).
How feasible is to write a driver code to run with the same mesh, same discretization and same equations to solve but with the matrix assembly only? Does it hang in that case too?

> 
> Regards,
> Manav
> 

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