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All to-all communication with minimum start-up costs in 2D/3D tori and meshes

机译:在2D / 3D花托和网格中以最低的启动成本进行全部通信

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All-to-all communication patterns occur in many important parallel algorithms. This paper presents new algorithms for all-to-all communication patterns (all-to-all broadcast and all-to-all personalized exchange) for wormhole switched 2D/3D torus- and mesh-connected multiprocessors. The algorithms use message combining to minimize message start-ups at the expense of larger message sizes. The unique feature of these algorithms is that they are the first algorithms that we know of that operate in a bottom-up fashion rather than a recursive, top-down manner. For a 2/sup d//spl times/2/sup d/ torus or mesh, the algorithms for all-to-all personalized exchange have time complexity of O(2/sup 3d/). An important property of the algorithms is the O(d) time due to message start-ups, compared with O(2/sup d/) for current algorithms. This is particularly important for modern parallel architectures where the start-up cost of message transmissions still dominates, except for very large block sizes. Finally, the 2D algorithms for all-to-all personalized exchange are extended to O(2/sup 4d/) algorithms in a 2/sup d//spl times/2/sup d//spl times/2/sup d/3D torus or mesh. These algorithms also retain the important property of O(d) time due to message start-ups.
机译:在所有重要的并行算法中都发生了所有通信模式。本文提出了新的算法,用于虫孔交换2D / 3D圆环和网状连接的多处理器的所有通信模式(所有广播和所有个性化交换)。该算法使用消息组合来最大程度地减少消息启动,但以更大的消息大小为代价。这些算法的独特之处在于,它们是我们所知的第一种以自下而上的方式而不是以递归,自上而下的方式运行的算法。对于2 / sup d // spl次/ 2 / sup d /圆环或网格,用于全部到所有个性化交换的算法的时间复杂度为O(2 / sup 3d /)。与当前算法的O(2 / sup d /)相比,算法的一个重要属性是由于消息启动而导致的O(d)时间。这对于现代并行体系结构尤其重要,在现代并行体系结构中,消息传输的启动成本仍然占主导地位,但块大小非常大。最后,将用于所有个性化交换的2D算法扩展为2 / sup d // spl times / 2 / sup d // spl times / 2 / sup d /中的O(2 / sup 4d /)算法3D圆环或网格。由于消息启动,这些算法还保留了O(d)时间的重要属性。

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