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Optimization of processor allocation for domain decomposed Monte Carlo calculations...

by John A Ellis, Thomas M Evans, Steven P Hamilton, C T Kelley, Tara M Pandya
Publication Type
Journal Name
Parallel Computing
Publication Date
Page Numbers
77 to 86

Load imbalance plagues domain decomposed Monte Carlo calculations when sources are not uniform. Parallel efficiency for domain decomposed Monte Carlo transport calculations improves through a nonuniform allocation of processors over subdomains. We optimize the allocation with runtime diagnostics collected during a calibration step, then complete the full calculation. The diagnostic-based approach is compared to implicit filtering, an optimization algorithm for bound constrained noisy optimization problems. We consider both forward and hybrid radiation transport calculations to measure performance.