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The use of distributed shared memory in parallel computer architecture however the use of distributed shared memory has the problem of accessing the remote memory that results in latency problems. This problem rises in the case of large scale multiprocessors such as massively parallel processors (MPP).
For instance one processor in a multiprocessor system requires two memory loads of two variables from two remote processors as displayed in Figure below. The issuing processor will employ these variables concurrently in one operation. In case of large scale MPP systems, the given below two problems occurs:
Figure: Latency problems in MPP
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