Berkeley Lab Scientific Computing Seminar

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 you 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

Scientific Computing

Contact Esmond G. Ng EGNg@lbl.gov