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A problem that occurs in parallel processing is allocating the available memory to the processors. This needs to be done in such a way that each processor has sufficient memory and not too much memory is being wasted. If processors have memory requirements that vary wildly over time, any memory allocation where a single memory can only be accessed by one processor will be inefficient. A solution to this problem is to allow memory sharing between processors. However, if there is a single shared memory for all the processors, there will be much contention which is also undesirable.
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