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1.Simplistically, the operating system kernel is just a computer program, one that manages the hardware and allows the user to perform tasks on a computerised device. When considering other computer programs such as word processors, text/code editors, and so on, it is possible to substitute one program with another of the same type to achieve the same task, e.g., you could substitute Microsoft Word with Apple Pages or LibreOffice Writer. Identify whether or not it is possible to substitute the operating system kernel in the same way. Explain why this was / was not possible.
2.Consider the following table of processes
Draw diagrams to illustrate the execution of these processes using the following CPU scheduling algorithms: FCFS, SJF, SRTN, and RR. Calculate the wait time and turnaround time for each process. For Round Robin, use a timeslice of two and if a process arrives at a time index when a context switch occurs the arriving process is added to the ready queue after the running process.
Note: wait time is the total time spent by the process waiting in the ready queue, i.e.,
the process is ready to run but the CPU is being used by another process.
3.CPU scheduling algorithms tend to favour I/O bound processes instead of CPU bound processes. The main reason for this is because it results in better utilisation of the computer’s hardware.
i) Given that the main work done by a computer is done by the processor, explain why favouring CPU bound processes (which primarily use the processor) does not result in better utilisation of the computer’s hardware.
ii) The Round Robin algorithm does not favour I/O bound processes. Explain why, and what changes could be made to fix this problem.
Process Arrival Duration
A 0 6
B 1 3
C 2 2
D 3 5
E 4 4
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4.The use of a memory abstraction provides several benefits, however also introduces overheads that are not incurred when using physical memory addressing. Such overheads can occur
(1) when the process is reading or writing to memory and
(2) for operations performed on the process itself (such as a system call).
For each category, explain why these overheads occur and how it is possible to reduce and/or eliminate the overheads entirely. If it is not possible to reduce or eliminate the overheads, explain why.
For (2), consider the system call to terminate a process.
5.Operating systems can perform memory management using either variable sized allocations, e.g., contiguous memory allocation, which allows the operating system to see and manage free regions of memory, or fixed size allocations, e.g., pages, where the operating system is unable to see the free regions of memory. For an operating system’s perspective ofthese two approaches, identify which of these approaches will be the most efficient in terms of
(i) minimum computation (when allocating/de-allocating memory), and
(ii) minimum wastage of memory. For each case, explain why.
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