Consider an interactive system with a CPU and two disks. The following measureme
ID: 649861 • Letter: C
Question
Consider an interactive system with a CPU and two disks. The following measurement data was obtained by observing the system: observation interval = 17 minutes mean think time = 12 seconds number of complete transactions during observation interval = 1 ,600 number of completions at CPU = 1,600 number of fast disk accesses = 32,000 number of slow disk accesses = 12,000(X) CPU busy time = 1,080 seconds fast disk busy time = 400 seconds slow disk busy time = 600 seconds (a) Give asymptotic bounds on throughput and response time as a function of the number of terminals.Explanation / Answer
The number of disks in the system N= 2.
Calculate the value of 'D' total busy time for the system using the formula,
The maximum time taken by the system is observed at CPU and represented using D(max).
The asymptotic bounds for throughput and response time as a function of number of terminals:
Throughput:
Let, X denote the Throughput.
The Throughput value is less than or equal to 1/1046.
Response Time:
Let, E(R) denote the Response Time.
The response time value is greater than or equal to 2150.