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Computer Engineering
After spending months carefully building his closed batch data storage system, David comes to see his advisor with the following description and measurements: The MPL for the system is fixed at 19 jobs. David explains that 90% of jobs find the data they need in the cache, and hence their expected response time is only 1 second. However, 10% end up having to go to the database, where their expected response time is 10 seconds. David’s advisor asks one question: “How many jobs do you see on average at the database?” When David answers “5,” his advisor says he needs to go back to the drawing board. What went wrong?

After spending months carefully building his closed batch data storage system, David comes to see his advisor with the following description and measurements: The MPL for the system is fixed at 19 jobs. David explains that 90% of jobs find the data they need in the cache, and hence their expected response time is only 1 second. However, 10% end up having to go to the database, where their expected response time is 10 seconds. David’s advisor asks one question: “How many jobs do you see on average at the database?” When David answers “5,” his advisor says he needs to go back to the drawing board. What went wrong?

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
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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After spending months carefully building his closed batch data storage system,
David comes to see his advisor with the following description and measurements:
The MPL for the system is fixed at 19 jobs. David explains that 90% of
jobs find the data they need in the cache, and hence their expected response time
is only 1 second. However, 10% end up having to go to the database, where their
expected response time is 10 seconds. David’s advisor asks one question: “How
many jobs do you see on average at the database?” When David answers “5,”
his advisor says he needs to go back to the drawing board. What went wrong?

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