[petsc-dev] Jack has produced a scalable sparse direct solver

[Hong Zhang]

Jack:

>
> I'm getting started on creating documentation right now; it should end up
> looking very similar to Elemental's.
>

The detailed instruction will be very helpful, especially
the sparse matrix data structures. Notify us when the documentation is out.
Is this a sparse Cholesky direct solver?
Currently, only mumps supports parallel sparse Cholesky direct solver.
Yours will be a good addition to the petsc external solvers.

>
> Please keep in mind that there is not _yet_ any support for pivoting, as I
> needed Clique's functionality for indefinite complex symmetric matrices
> which are nice enough to be factored accurately without pivoting.


Petsc users likely use it as a preconditioner.
In case of zero pivot, you may provide a routine/option for adding a small
shift?

>
> Clique's nested dissection is built on top of a nodal graph bisection
> routine which uses a custom interface to parmetis; I suspect that the graph
> partitioning is currently the least scalable part of the black-box
> interface due to KLFM refinement being so hard to parallelize.


Xuan has almost finished the petsc-elemental interface
(see petsc-dev/src/mat/impls/elemental/).
We would appreciate if you can take a look at it and give us
your comments/suggests.

Hong

>
>
> On Mon, Jul 23, 2012 at 10:12 AM, Hong Zhang <hzhang at mcs.anl.gov> wrote:
>
>> Xuan will take a look at this.
>> Hong
>>
>> On Mon, Jul 23, 2012 at 9:47 AM, Matthew Knepley <knepley at gmail.com>wrote:
>>
>>> I think we just need a small converter from AIJ:
>>>
>>>
>>> https://bitbucket.org/poulson/clique/src/dc417c7e9403/tests/DistSparseMatrix.cpp
>>>
>>>   Matt
>>>
>>> --
>>> 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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