Argonne National Laboratory

Upcoming Events

Hierarchical Krylov and Nested Krylov Methods using PETSc for Extreme-scale Computing

LANS Informal Seminar
Hong Zhang (MCS)
February 12, 2014 3:00PM to 4:00PM
Building 240, Room 1404-1405
We present hierarchical Krylov methods and nested Krylov methodsto overcome the scaling difficulties for extreme-scale computing.We demonstrate the impact at high core countson the PFLOTRAN subsurface flow application.

Because these algorithms can be activated at runtime via the PETSc library, application codes that employ PETSc can easily experiment with such techniques.The principles of hierarchal Krylov methods and nested Krylov methods can beapplied to complementary advances insynchronization/communication-avoiding Krylov methods, therebyoffering potentially multiplicative benefits of combined approaches.We also demonstrate a Scientific Application Web server (SAWs) still under development that assists users in viewing, customizing and assembling the composable solvers.