[petsc-dev] why does MatCreate_MPIDense still exist?

Jed Brown jedbrown at mcs.anl.gov
Mon Aug 13 11:50:23 CDT 2012

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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