[petsc-users] [petsc-dev] MatMatSolve and mumps

[Jed Brown]

Jose David Bermeol <jbermeol at purdue.edu> writes:

> So for which solvers MatMatSolve does not work??

There is a default implementation (MatMatSolve_Basic) that just solves
single vector problems in sequence.  So you can use the interface, but
the execution might vary between solvers.

The MUMPS interface is actually a liability here because they insist on
having the entire vector on rank 0.  This is a terrible interface and
not memory-scalable.  If you naively put many RHS vectors on rank 0, you
would likely run out of memory.
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