There is the multicore package: http://cran.r-project.org/web/packages/multicore/index.html http://cran.r-project.org/web/packages/multicore/index.html My wor

There is the multicore package: http://cran.r-project.org/web/packages/multicore/index.html http://cran.r-project.org/web/packages/multicore/index.html My worry with parallel loops in R would be inadvertent race conditions. For example, is the random number generator in R thread safe? I doubt it.