2ème Journée Calcul Haute Performance

Europe/Paris
S112 (Université de Toulon)

S112

Université de Toulon

Pascal Véron (Laboratoire IMath)
Description
Cette deuxième journée (sous forme de deux 1/2 journées: 5 et 10/12) organisée par le laboratoire IMath fait suite à la journée programée en Décembre 2012. Il s'agit de présenter à la communauté universitaire des retours d'expérience en industrie et dans le monde de la recherche sur l'utilisation du calcul haute performance.
  • Thursday, 5 December
    • 10:30 11:30
      Un retour d'expérience sur le développement d'un code de recherche dans l'environnement PETSc 1h
      PETSc is a suite of data structures and routines for the scalable (parallel) solution of scientific applications modeled by partial differential equations. It supports MPI, shared memory pthreads, and NVIDIA GPUs, as well as hybrid MPI-shared memory pthreads or MPI-GPU parallelism.
      Speaker: Mr Marc Medale (Polytech' Marseille)
  • Tuesday, 10 December
    • 10:30 11:30
      Linear Algebra for the Discrete Logarithm Problem using GPUs 1h
      In the context of cryptanalysis, computing discrete logarithms in large cyclic groups using index-calculus-based methods, such as the number field sieve (NFS-DL) or the function field sieve (FFS), requires solving large sparse systems of linear equations modulo the group order. Most of the fast algorithms used to solve such systems -- e.g., the conjugate gradient or the Lanczos and Wiedemann algorithms -- iterate a product of the corresponding sparse matrix with a vector (SpMV). We investigate accelerating this central operation on NVIDIA GPUs. In this talk, we present a matrix format suitable to the sparsity and the specific computing model and how we use Residue Number System (RNS) arithmetic to accelerate modular operations.
      Speaker: Mr Jeljeli HAMZA (Loria, Nancy)
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