about ISCreateGeneral() and MatGetSubMatrices()

[Yujie]

that is, even if one use MPI_COMM to create an IS object. it is always a
sequential object, right? thanks, Matt.

On Mon, Sep 29, 2008 at 11:40 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Mon, Sep 29, 2008 at 1:33 PM, Yujie <recrusader at gmail.com> wrote:
> > I am wondering how to use ISCreateGeneral().
> >
> > Assuming I use 2cpus when I run my codes. I use MPI_COMM to create an
> object
> > of IS using ISCreateGeneral() and an array on a single cpu. how to
> > distribute this IS object on these 2cpus? If I use MatGetSubMatrices() to
> > get different submatrices on different cpus. I am wondering how to create
> IS
> > object, using PETSC_COMM_SELF? thanks a lot.
>
> You provide the indices you want for each process \emph{locally} on
> that process.
> There is no facility for communicating indices in IS.
>
>  Matt
>
> > Regards,
> >
> > Yujie
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which
> their experiments lead.
> -- Norbert Wiener
>
>
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