What is the access time for a 32-bit word if your Cache Hit Rate is 98%. Memory
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Question:
What is the access time for a 32-bit word if your Cache Hit Rate is 98%. Memory access time for a byte is 1 microsecond and cache operate at half the clock speed. The CPU is a 1 GHz processor with double clocking. Be specific in your assumptions. How could you increase CHR?
an example provided:
Memory Access Time == 5 nsec
Clock speed 1 gHz è 1 nsec
Reasonable to assume a Cache Access of 2 nec
CHR = 99%
Assumptions: CPU knows the cache
Average Memory Access Time == 2nec (99%) + 5nec(1%)
2nsec
HDD access – 20 msec
MHR = 95%
AMAT(95%) + 5%(20 msec)
Related Book For
Computer Organization and Design The Hardware Software Interface
ISBN: 978-0124077263
5th edition
Authors: David A. Patterson, John L. Hennessy
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