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We consider the relative power of concurrentwrite PRAMs when the number of processors (and input variables) is fixed at n, and infinite shared memory is allowed. Several different models (COMMON, ARBITRARY, PRIORITY) have been used for algorithm design in the literature; these models differ in their method of write-conflict resolution. Recent work in separating these models ([FRW1,2,3], [LY]) has...
A new technique for proving lower bounds for parallel computation is introduced. This technique enables us to obtain, for the first time. non-trivial tight lower bounds for shared-memory models of parallel computation that allow simultaneous read/write access to the same memory location. The size m of the common memory is called communication width or width in short. For a wide variety of problems...
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