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ABSTRACT: If an item is accessed frequently enough, it should be main memory resident. For current technology, frequently enough means about every five minutes. Along a similar vein, one can frequently trade memory space for cpu trme. For example, bits can be packed in a byte at the expense of extra instructions to extract the bits. It makes economic sense to spend ten bytes of main memory to save one lnstructlon per second. These results depend on current price ratios of processors, memory and disc accesses These ratios are changing and
Gray et al. (Thu,) studied this question.