Li Todo Maggs Krauth 2020

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B. Li, S. Todo, A. C. Maggs, W. Krauth Multithreaded event-chain Monte Carlo with local times Computer Physics Communications 261 107702 (2021)

Abstract We present a multithreaded event-chain Monte Carlo algorithm (ECMC) for hard spheres. Threads synchronize at infrequent breakpoints and otherwise scan for local horizon violations. Using a mapping onto absorbing Markov chains, we rigorously prove the correctness of a sequential-consistency implementation for small test suites. On x86 and ARM processors, a C++ (OpenMP) implementation that uses compare-and-swap primitives for data access achieves considerable speed-up with respect to single-threaded code. The generalized birthday problem suggests that for the number of threads scaling as the square root of the number of spheres, the horizon-violation probability remains small for a fixed simulation time. We provide C++ and Python open-source code that reproduces all our results.

Electronic version (from arXiv)

DOI: 10.1016/j.cpc.2020.107702

Journal version (requires subscription) GitHub repository from which the ParaSpheres programs described in the paper (in Python, Fortran, C++, and shell) may be forked, cloned, or simply copied.

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