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Earthquakes cause load imbalance as "action" concentrated in processors where quake occurs
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Can be addressed at cost of increasing communication by using "block-cyclic" decomposition so each processor gets part of action
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Problem particularly bad for Monte Carlo as like classic "clustering algorithms" needed near critical points to get good performance and these have poor parallel performance
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Long range versions of Monte Carlo will perform satisfactorily as can parallelize over long range force part of computation
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