ITPEC IP October 2020 Question 11
ITPEC IP October 2020 — Question 11 of 100
CPU cache reduces the effective access time of main memory by keeping recently or frequently used instructions and data in faster storage near the processor. A cache hit avoids the longer main-memory access; hardware automatically manages placement and replacement.
Answer (b)
Why not others:
- cache is much smaller than main memory
- a large main memory does not eliminate the speed gap that cache addresses
- users do not normally choose programs to reside directly in CPU cache
Key rule: Cache exploits temporal and spatial locality to bridge the speed difference between the CPU and main memory.
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