[BANANA] Berkeley Lab - Scientific Computing Seminar, September 15, 2006

[Parry Husbands]

Date: Friday, September 15, 2006
Time: 1:00pm-2:00pm
Location: Building 50A-5132

Seminar Speaker: Emmanuel Agullo
                  LIP / ENS Lyon
                  France
                  http://graal.ens-lyon.fr/~eagullo/

Title: Towards a Parallel Out-of-core Multifrontal
        Solver: A Preliminary Study

Abstract:

The memory usage of sparse direct solvers can be the bottleneck
to solve large-scale problems. I will present a prototype
implementation of an out-of-core extension to a parallel multifrontal
solver (MUMPS). We show that, by storing the factors to disk, larger
problems can be solved on limited-memory machines with reasonable
performance. We illustrate the impact of low-level IO mechanisms on
the behaviour of our parallel out-of-core factorization. Then we use
simulations to discuss how our algorithms can be modified to solve much
larger problems at the cost of increasing the volume of disk access.

This is a joint work with Abdou Guermouche and Jean-Yves L'Excellent.

Sponsor of Seminar: Sherry Li