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We will explore the impact of cache capacity on performance, focusing exclusively on the data cache and excluding instruction storage in the caches. Cache access
We will explore the impact of cache capacity on performance, focusing
exclusively on the data cache and excluding instruction storage in the caches. Cache access time
is directly linked to its capacity. For the sake of simplicity, let's assume that accessing the main
memory takes ns and in a specific program, of instructions involve data access.
Two distinct processors, denoted as P and P are engaged in executing this program. Each
processor is equipped with its own L cache.
L size L Miss Rate L Hit Time
P KB ns
P KB ns
a What is the AMAT for P and P assuming no other levels of cache?
b Assuming an ideal CPI of for both processors and where the L hit time determines the
cycle time, what is the CPIstall for P and P Which processor is faster at executing this
particular program?
Now consider the addition of an L cache to P with the following characteristics. The data from
the previous table still holds.
L size L Miss Rate L Hit Time
MB s
c Determine the Average Memory Access Time AMAT for P with the introduction of an L
cache. Does the inclusion of the L cache result in an improvement or degradation of the
AMAT?
d Given an ideal CPI of where the cycle time is dictated by the L hit time, calculate the
Cycle Per Instruction CPIstall for P with the incorporation of an L cache.
e Which processor demonstrates superior speed now that P is equipped with an L cache? If
P exhibits enhanced speed, what miss rate in its L cache would be required to match Ps
performance? Alternatively, if P proves to be faster, what miss rate in its L cache would be
necessary to equal Ps performance?
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