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A general description is here.
‘par*apply’ and ‘par*applyLB’ gain an optional argument ‘chunk.size’ which allows to specify the granularity of scheduling.
‘parLapplyLB’ and ‘parSapplyLB’ have been fixed to do load balancing (dynamic scheduling). This also means that results of computations depending on random number generators will now really be non-reproducible, as documented.