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Exam2-Questions

# Exam2-Questions - 1 N jobs per second for N ≤ 2 and at a...

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ECE 460: Computer System Performance Evaluation Spring 2005 Exam 2 Name____________________ This is an OPEN BOOK and OPEN NOTES exam. You have 75 minutes to complete the test. If you make any assumptions, state them before you start the problem. 1. (50 points) Consider that you have a server connected to the Internet that takes 1.5 ms to process a request. Jobs are arriving at the rate of 500 jobs per second. You have been asked to assess the impact on queue length, response time and throughput if you replace the server with one that is twice as fast. Show your work, including a state transition diagram.

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2. (50 points) Consider that you are the administrator for a Unix server. The server has at most 3 terminals that can connect to it. Since there is such a small number of terminals, they are always all in use. The server processes jobs at a variable rate of
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Unformatted text preview: 1 * N jobs per second for N ≤ 2, and at a rate of 2 jobs per second for N > 2, where N is the number of jobs in the system. Once a job is processed, it goes back to the terminal where a user will think for 5 seconds before submitting the job back to the system. Calculate the response time? Show your work, including a state transition diagram. 3. (50 points) Consider an email server for a very large company. The server receives requests at the rate of 100 per minute. Consider that the server has been designed to work more efficiently at heavy loads. The server is able to respond to each mail request at the rate of 50 * N per minute, where N equals the number of pending requests. What is the average queue length in the server? Show your work, including a state transition diagram....
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Exam2-Questions - 1 N jobs per second for N ≤ 2 and at a...

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