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ISRO-2013-16

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How much speed do we gain by using the cache, when cache is used $80$% of the time? Assume cache is faster than main memory.

  1. $5.27$
  2. $2.00$
  3. $4.16$
  4. $6.09$
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Speed Gain=(Memory Access Time without Cache)/( Memory Access Time with Cache).
Let M is the memory access time and C is the Cache access time.
Then,
Speed Gain= M/ (0.8M +0.2C).
Note: Speed Gain can be computed if we know how faster is the Cache when compared with Memory
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