Section: New Results

Generic Deterministic Random Number Generation in Dynamic-Multithreaded Platforms

On dynamic multithreaded platforms with on-line scheduling such as work-stealing, randomized computations raise the issue of reproducibility. Compliant with de facto standard sequential Deterministic Random Number Generators (DRNGs) noted R, we propose [23] a parallel DRNG implementation for finite computations that provides deterministic parallel execution. It uses the stateless sub-stream approach, enabling the use of efficient DRNG such as Mersenne Twister or Linear Congruential. We demonstrate that if R provides fast jump ahead in the random sequence, the re-seeding overhead is small, polylog in expectation, independently from the parallel computation's depth. Experiments benchmark the performance of randomized algorithms employing our solution against the stateful DRNG DotMix, tailored to the Cilk Plus dynamic multithreading runtime. The overhead of our implementation ParDRNG compares favorably to the linear overhead of DotMix re-seedings.