Consider a three-level memory system, where the access time for the cache is T1 nanoseconds, main memory access time is T2 microseconds, and disk access time is T3 milliseconds. Main memory hit ratio is estimated to be 40%.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Consider a three-level memory system,
where the access time for the cache is T1
nanoseconds, main memory access time is
T2 microseconds, and disk access time is T3
milliseconds. Main memory hit ratio is
estimated to be 40%.
a) What are the minimum and the
maximum possible access times? Show
your work.
b) If the cache hit ratio H is 60%. What is the
relation between T1, T2, and T3 to achieve
an average access time less than 10 * T1.
Show your work.
Transcribed Image Text:Consider a three-level memory system, where the access time for the cache is T1 nanoseconds, main memory access time is T2 microseconds, and disk access time is T3 milliseconds. Main memory hit ratio is estimated to be 40%. a) What are the minimum and the maximum possible access times? Show your work. b) If the cache hit ratio H is 60%. What is the relation between T1, T2, and T3 to achieve an average access time less than 10 * T1. Show your work.
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