Suppose that a processor has access to three levels of memory. Level 1 contain 2000 words and has an access time of 0.02 msec. Level 2 contain 10,000 words and has an access time of 0.2 msec. Level 3 contains 20,000 words and has an access time of 2 msec. Assume that if a word to be accessed is in level 1, then processor access it directly. If it is in level 2 the word is first transferred to L, and then accessed by the processor. Similarly for La the word is transferred to L, then to L, and then accessed. The hit ratio for level 1 is 0.65 and for level 2 is 0.45. The average access time (in usec) is

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Suppose that a processor has access to three levels of memory. Level 1 contain 2000 words and has an access time of 0.02 msec. Level 2
contain 10,000 words and has an access time of 0.2 msec. Level 3 contains 20,000 words and has an access time of 2 msec. Assume that
if a word to be accessed is in level 1, then processor access it directly. If it is in level 2 the word is first transferred to L, and then accessed
by the processor. Similarly for L3 the word is transferred to L, then to L, and then accessed. The hit ratio for level 1 is 0.65 and for level 2 is
0.45. The average access time (in usec) is
Transcribed Image Text:Suppose that a processor has access to three levels of memory. Level 1 contain 2000 words and has an access time of 0.02 msec. Level 2 contain 10,000 words and has an access time of 0.2 msec. Level 3 contains 20,000 words and has an access time of 2 msec. Assume that if a word to be accessed is in level 1, then processor access it directly. If it is in level 2 the word is first transferred to L, and then accessed by the processor. Similarly for L3 the word is transferred to L, then to L, and then accessed. The hit ratio for level 1 is 0.65 and for level 2 is 0.45. The average access time (in usec) is
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