B)[2 pts] When comparing a set-associative with a directly-mapped cache with thesame capacity (data size), the set-associative cache decreases the cache miss rate butincreases the hit time explain why?
Added by Brandon C.
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In a directly-mapped cache, each memory block can only be mapped to a single cache line. This means that if multiple blocks map to the same cache line, only one can be present in the cache at a time. In contrast, a set-associative cache allows multiple blocks to Show more…
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Q: Whereas larger caches have lower miss rates, they also tend to have longer hit times. Assume a direct-mapped 8 KB cache has 0.22 ns hit time and miss rate m1; also assume a 4-way associative 64 KB cache has 0.52 ns hit time and a miss rate m2. a. [5]If the miss penalty is 100 ns, when would it be advantageous to use the smaller cache to reduce the overall memory access time? b. [15]Repeat part (a) for miss penalties of 10 and 1000 cycles. Conclude when it might be advantageous to use a smaller cache.
Adi S.
Consider an $L_{1}$ cache with an access time of $1 \mathrm{~ns}$ and a hit ratio of $H=0.95$. Suppose that we can change the cache design such that we increase $H$ to $0.98$, but increase access time to $1.5 \mathrm{~ns}$. Which of the following condition is met for this change to result in improved performance? (A) Next level memory access time must be less than $16.67$ (B) Next level memory access time must be greater than $16.67$ (C) Next level memory access time must be less than 50 (D) Next level memory access time must be greater than 50
Computer Organization and Architecture
Cache and Main Memory, Secondary Storage
is hit time in a cache directly proportional to its hit rate?
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