Improved Cache Performance in Monte Carlo Transport Calculations Using Energy Banding

TitleImproved Cache Performance in Monte Carlo Transport Calculations Using Energy Banding
Publication TypeJournal Article
Year of Publication2013
AuthorsSiegel, AR, Smith, K, Felker, KG, Romano, PK, Forget, B, Beckman, PH
JournalComputer Physics Communications
Other NumbersANL/MCS-P4090-0713
Abstract

We present an energy banding algorithm for Monte Carlo (MC) neutral particle transport simulations which depend on large cross section lookup tables. In MC codes, read-only cross section data tables are accessed frequently, exhibit poor locality, and are typically much too large to fit in fast memory. Thus, performance is often limited by long latencies to RAM, or by off-node communication latencies when the data footprint is very large and must be decomposed on a distributed memory machine. The proposed energy banding algorithm allows maximal temporal reuse of data in band sizes that can flexibly accommodate different architectural features. The energy banding algorithm is general and has a number of benefits compared to the traditional approach. In the present analysis we explore its potential to achieve improvements in time-to-solution on modern cache-based architectures.

 

PDFhttp://www.mcs.anl.gov/papers/P4090-0713.pdf