[petsc-users] MatPermuteSparsify hanging

[Kelly Fermoyle]

Okay, I don't actually need it. I ran it until it finally completed (45
minutes for 1 million nonzeros) and it didn't seem to help my
preconditioner.

Thanks for looking into it. Seems like you could leave it in as a
Developer function and note that it is not efficient.


> On Mon, Nov 29, 2010 at 4:34 PM, Jed Brown <jed at 59a2.org> wrote:
>
>> On Mon, Nov 29, 2010 at 23:32, Jed Brown <jed at 59a2.org> wrote:
>>
>>> On Mon, Nov 29, 2010 at 23:30, Barry Smith <bsmith at mcs.anl.gov> wrote:
>>>
>>>> who wrote this routine
>>>
>>>
>>> changeset:   19:eb3da2ea4a05
>>> parent:      16:4babff491f33
>>> user:        knepley at spinetta.mcs.anl.gov
>>> date:        Thu Oct 11 06:00:09 2001 -0600
>>> summary:     bk-changeset-1.21.1.1
>>>
>>
>> MatMultConstrained also still exists from this changeset, is marked as
>> "beginner", but has zero implementations in PETSc.
>>
>
> I thought Barry ripped that out long ago.
>
>   Matt
>
>
>> Jed
>>
>
>
>
> --
> 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
>