Argonne National Laboratory

High Performance Parallel Implicit CFD

TitleHigh Performance Parallel Implicit CFD
Publication TypeReport
Year of Publication2000
AuthorsGropp, WD, Kaushik, DK, Keyes, DE, Smith, BF
Date Published12/2000
Other NumbersANL/MCS-P863-1200

Fluid dynamical simulations based on finite discretizations on (quasi-)static grids scale well in parallel, but execute at a disappointing percentage of per-processor peak floating point operation rates without special attention to layout and access ordering of data. We document both claims from our experience with an unstructured grid CFD code that is typical of the state of the practice at NASA. These basic performance characteristics of PDE-based codes can be understood with surprisingly simple models, for which we quote earlier work, presenting primarily experimental results herein. These performance models and experimental results motivate algorithmic and software practices that lead to improvements in both parallel scalability and per node performance. This snapshot of ongoing work updates our 1999 Bell Prize-winning simulation on ASCI computers