[petsc-users] [petsc-dev] MatPreallocatorPreallocate segfault with PETSC 3.16

[Patrick Sanan]

Am Di., 1. Feb. 2022 um 16:20 Uhr schrieb Jed Brown <jed at jedbrown.org>:

> Patrick Sanan <patrick.sanan at gmail.com> writes:
>
> > Sorry about the delay on this. I can reproduce.
> >
> > This regression appears to be a result of this optimization:
> > https://gitlab.com/petsc/petsc/-/merge_requests/4273
>
> Thanks for tracking this down. Is there a reason to prefer preallocating
> twice
>
>    ierr =
> MatPreallocatorPreallocate(preallocator,PETSC_TRUE,A);CHKERRQ(ierr);
>    ierr =
> MatPreallocatorPreallocate(preallocator,PETSC_TRUE,A_duplicate);CHKERRQ(ierr);
>
> versus using MatDuplicate() or MatConvert()?
>

Maybe if your preallocation is an overestimate for each of two different
post-assembly non-zero structures in A and A_duplicate?
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