[petsc-users] same_nonzero_pattern in SNESSetJacobian()

[Xiangdong]

Each time I call my Jacobian function, it generates the Jacoiban matrix
from scratch by inserting entries. The result of this assembling process
gives the same nonzero pattern as in the previous iteration. Can SNES/KSP
track this too?

Thanks.

Xiangdong

On Wed, Sep 9, 2015 at 5:01 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   Mat now keeps track of its nonzero pattern. If you do not change the
> pattern by inserting values then SNES/KSP will automatically keep the same
> pattern and optimize for it.
>
>   Barry
>
> > On Sep 9, 2015, at 3:57 PM, Xiangdong <epscodes at gmail.com> wrote:
> >
> > Hello everyone,
> >
> > As mentioned in the 3.5 changes, MatStructure argument is removed from
> SNESSetJacobian(). If each time, my Jacobian always has
> same_nonzero_pattern. How do I pass this information to SNES or the KSP? I
> only find reuse same preconditioner, but not reuse same pattern.
> >
> > Thank you.
> >
> > Xiangdong
>
>
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