*** Apologies for Cross Posting *** ACCESS GRID SEMINAR:
"Two recent examples of HPC Research at Manchester Computing: Symmetric Pivoting in ScaLAPACK and Improving Collective Calls with MPI One-sided Communication" Dr Craig Lucas & Kevin Roy, University of Manchester Friday 6th October 2006, 1400-1500 (1300-1400 UTC) Room 1.10, Kilburn Building The role of the HPC team at Manchester Computing is to help support research using HPC systems; this is achieved in many ways. This seminar provides two recent examples of where work undertaken at Manchester Computing aids research across scientific domains. In the ScaLAPACK parallel numerical linear algebra library there is no symmetric (or "complete") pivoting in its algorithms. Here we examine an implementation of the pivoted Cholesky factorization of semidefinite matrices, which uses symmetric pivoting, and provides new functionality for ScaLAPACK. The routine is built using PBLAS, the BLACS routines and block cyclic data distribution. The majority of parallel applications on HPC machines use MPI. In some cases MPI collective operations consume a substantial amount of time reducing the efficiency of the application. This talk describes work that has dramatically improved the efficiency of the collective operations and hence scalability of the applications that use them. *** Access Grid Information *** For information regarding joining the seminar using the Access Grid, please see http://www.mc.manchester.ac.uk/research/seminars Best regards Lee --- Dr Lee Margetts Senior HPC Consultant University of Manchester
