[petsc-users] randomness from MATSOLVERPACKAGE

[Jed Brown]

How is the matrix assembled?

How different? You should usually not expect deterministic associativity.
If your results are sensitive, you may be able to make it deterministic
(with extra work and choice of package), but you should probably
reformulate the problem.
On May 30, 2012 9:21 AM, "Hui Zhang" <mike.hui.zhang at hotmail.com> wrote:

>
> > I suspect there are some randomness from external matsolverpackage. I
> use a parallel matrix
> > as preconditioner, and the preconditioner is exactly LU factored, then I
> saw the KSP (gmres)
> > residuals are different from different runs.
>
> Besides, for sequential matrix, there is no such phenomenon, only for
> parallel matrix.
>
> >
> > Is it true of randomness from matsolverpackage?  Thanks a lot!
>
>
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