Cache performance and Access time of memories

• Cache hit

✓ When CPU refers to memory and find the data or instruction within the Cache Memory

• Cache miss

✓ If the desired data or instruction is not found in the cache memory and CPU refers to the

main memory to find that data or instruction

Hit + Miss = Total CPU Reference

Hit Ratio h = Hit / ( Hit + Miss )

Average access time of any memory system consists of two levels:

✓ Cache Memory

✓ Main Memory

• If Tc is time to access cache memory and Tm is the time to access main

memory and h is the cache hit ration, then

Tavg = Average time to access memory

Tavg = h * Tc + ( 1-h ) * ( Tm + Tc )

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