| The Hit Ratio |
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| ä | Hit
ratio = fraction of |
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| access
where data is in |
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| cache |
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| ä | T1 =
access time for |
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| fast
memory |
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| ä | T2 =
access time for |
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| slow
memory |
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| ä | T2
>> T1 |
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| ä | When
hit ratio is close |
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| to 1
the average access |
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| time
is close to T1 |
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