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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?

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)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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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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