Abstract
Valiant's model of bulk-synchronous parallel (BSP) computation does not allow the programmer to synchronize a subset, rather than the complete set of a parallel computer's processors. This is perceived by many to be an obstacle to expressing divide-and-conquer algorithms in the BSP model. We argue that the divide-and-conquer paradigm fits naturally into the BSP model, without any need for subset synchronization. The proposed method of divide-and-conquer BSP programming is fully compliant with the BSP computation model. The method is based on sequentially interleaved threads of BSP computation, called superthreads.
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