CS 3733 Operating Systems, Spring 2006 Assignment 2 Comments

• This assignment was graded on the basis of 30 points.
• Parts 0, 1, 2, and 3ab were worth 5 points each.
• The experiment you ran on the simulator was worth 10 points.

1. The answer to Part 0 was 1 CPU burst of 10 units.
2. Compare the quantum to the shortest CPU burst.
3. Do not use the waiting time as a performance measure since it is 0 for one process. Use the turnaround time.
4. Do one experiment with several runs. This puts everything in a single table for easy comparison.
5. In your paragraph for Part 3c, refer explicitly to the numbers in your tables. Do not just say that the experiment worked or agreed with your statement.
6. The idea here is that the statement is only true if no I/O is done. When the processes do I/O time sharing is more efficient than running on a slow machine since the CPU can overlap with I/O of other processes.
7. Nobody did any experiments with a large amount of I/O. A large amount of I/O for a process in this case would be about 20 times the duration of the process. This gives the maximum overlap of CPU and I/O.
8. If you do not understand something, ask me. You can always use email.