In this paper we compare the power of the two most commonly used concurrent-write models of parallel computation, the COMMON PRAM and the PRIORITY PRAM. These models differ in the way they resolve write conflicts. If several processors want to write into the same shared memory cell at the same time, in the COMMON model they have to write the same value. In the PRIORITY model, they may attempt to write different values; the processor with smallest index succeeds.
We consider PRAM's with
In the case of small memory, the PRIORITY model can be faster than the COMMON model by a factor of &THgr;(log
We develop new proof techniques to obtain these results. The technique used for the second lower bound is strong enough to establish the first tight time bounds for the PRIORITY model, which is the strongest parallel computation model. We show that finding the maximum of
在本文中,我们比较了两种最常用的并行计算并发写入模型(COMMON PRAM和PRIORITY PRAM)的功能。这些模型在解决写入冲突的方式上有所不同。如果多个处理器要同时写入相同的共享存储单元,则在COMMON模型中,它们必须写入相同的值。在PRIORITY模型中,他们可能会尝试写入不同的值。索引最小的处理器成功。 P>
我们考虑具有 在内存较小的情况下,PRIORITY模型的速度可能比COMMON模型的速度快&THgr;(log 我们开发了新的证明技术来获得这些结果。用于第二下限的技术足够强大,可以为优先级模型(它是最强大的并行计算模型)建立第一紧时限。我们表明,找到最大
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