DARREN J. KERBYSON
Performance and Architectures Laboratory, Modeling, Algorithms and Informatics Group, CCS-3, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
ADOLFY HOISIE
Performance and Architectures Laboratory, Modeling, Algorithms and Informatics Group, CCS-3, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
HARVEY J. WASSERMAN
Performance and Architectures Laboratory, Modeling, Algorithms and Informatics Group, CCS-3, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Received March 22, 2003
Revised August 20, 2004

In this paper we describe an important use of predictive application performance modeling - the validation of measured performance during a new large-scale system installation. Using a previously-developed and validated performance model for SAGE, a multidimensional, 3D, multi-material hydrodynamics code with adaptive mesh refinement, we were able to help guide the stabilization of the first phase of the Los Alamos ASCI Q supercomputer. We review the salient features of an analytical model for this code that has been applied to predict its performance on a large class of Tera-scale parallel systems. We describe the methodology applied during system installation and upgrades to establish a baseline for the achievable "real" performance of the system. We also show the effect on overall application performance of certain key subsystems such as PCI bus speed and multi-rail networks. We show that utilization of predictive performance models is also a powerful system debugging tool.

Performance modeling; terascale systems; performance validation; high performance computing