A two level memory is having 140ns average access time without the level 30ns with level. If the fastest memory access time is 20ns. What is hit ratio?
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Expert's answer
2014-02-06T02:30:14-0500
We can use the formula: average data access time = Cache access time + (1 - hit ratio) main memory access time; So if hit ratio will be x, we can write the next: 20 nS + (1 - x) 140 nS = 30 nS 20 nS + 140 nS - 140 nS x = 30 nS - 140 nS x + 160 nS = 30 nS - 140 nS x = - 130 nS x = 0.928 So hit ratio will be 0.928 or 92.8%
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