[petsc-dev] why does MatCreate_MPIDense still exist?

[Hong Zhang]

Barry,
Elemental interface is not well tested yet.
I would wait for few months to remove PLAPACK stuff.

Hong

On Mon, Aug 13, 2012 at 11:50 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Mon, Aug 13, 2012 at 10:40 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>> Should I remove all the MPIDense stuff from PETSc now?   It is uses
>> PLAPACK which is buggy and unsupported.
>
>
> That is still a good distribution for MxN matrices with M>>N. We can do
> them with Elemental, but that would use a different distribution so it will
> be more complicated to interact with. (The current Elemental interface uses
> a squarish distribution, but we can tell Elemental to use the [VC,*]
> distribution (for which fewer operations are supported).
>
> The main thing I care about for that distribution is QR. The best format
> is dense and row-aligned. I don't care whether it uses MPIDense or a new
> "multi-vector" thing, but that concept should be somewhere.
>
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