If T1 is L1 cache access time, T2 is L2 cache access time Tm is memory access time, h1 is hit rate for L1, and h2 is hit rate for L2 (0<=h1,h2<-1) What is the formula to calculate Average Memory Access Time?

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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C.
If T1 is L1 cache access time,
T2 is L2 cache access time,
Tm is memory access time,
h1 is hit rate for L1,
and h2 is hit rate for L2 (0<=h1,h2<3D1)
What is the formula to calculate Average Memory Access Time?
Transcribed Image Text:C. If T1 is L1 cache access time, T2 is L2 cache access time, Tm is memory access time, h1 is hit rate for L1, and h2 is hit rate for L2 (0<=h1,h2<3D1) What is the formula to calculate Average Memory Access Time?
What are the Data transfer Units between these
functional modules in below Memory Architecture ? (referring to Blue arrows]
registers
answer
CACHE
answer
MEMORY
answer
HARD DISK / SSD
Magretic/Optical
backup&archleve
answer
B.
What controls the connectivity between Main Memory and Hard
Disk/SSD and also all Virtual Memory functions?
Answer:
Transcribed Image Text:What are the Data transfer Units between these functional modules in below Memory Architecture ? (referring to Blue arrows] registers answer CACHE answer MEMORY answer HARD DISK / SSD Magretic/Optical backup&archleve answer B. What controls the connectivity between Main Memory and Hard Disk/SSD and also all Virtual Memory functions? Answer:
Expert Solution
Step 1

Derivation:

In cache memory, the average access time for single level cache organization is given by:

average memory access time = Hit Time + Miss Rate * Miss Penality

Where Hit Time = h(hit rate) * T(cache access time), Miss Rate = (1 - h) * Tm(Main memory access time)

which become, Tavg = h * T + (1 - h) Tm

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