Question

In: Computer Science

1) A process control block determines which process is to be executed next is an example...

1)

A process control block

		determines which process is to be executed next
		is an example of a process queue.
		Stores the address of the next instruction to be processed by a different process
		Includes information on the process's state

2)

Consider a disk queue holding requests to the following cylinders in the list order: 98, 183, 57, 122, 200, 124, 65, 67. Using the SSTF scheduling algorithm, what is the order that the requests are serviced assuming the disk head is at cylinder 65?

		65, 57, 98, 67, 122, 124, 183, 200
		65, 67, 57, 98, 122, 124, 200, 183
		65, 67, 57, 98,122, 124, 183, 200
		65, 200, 183, 124, 122, 67, 98, 57

3)

Which of the following dynamic storage-allocation algorithm in use if selecting 50KB hole in meeting the sequence of 50KB, 100KB, 270KB, and 40KB for a 20KB process?

		First fit
		Best fit
		Worst fit
		None of the above

Expert Solution

Hello,

I am happy to help with these question .

1) The process control block

Answer) includes information on the process's state .

This is because when context switching takes place in between the processes , each process has its own process control block and this is used to store the state of the process .

2) in this part we need to identify the SSTF way to disk scheduling .

In SSTF (shortest seek time first) we give service on the basis of the shortest seek time .

In this question, the head is at 65 .

now next service will be to shortest seek time and that is to 67.

now it service will be given to 57.

now to 98.

So the answer will be:

Answer:65,67,57,98,122,124,183,200.

For an explanation i have attached an image .

3)Which of the following dynamic storage-allocation algorithm in use if selecting 50KB hole in meeting the sequence of 50KB, 100KB, 270KB, and 40KB for a 20KB process?

Answer : FIRST FIRST.

This is because we are allocating first hole available that can contain the process.

Thank you.

I hope i was able to help you with this question . If you any queries please be comfortable to ask in the comments i will be glad to help.

:).

venereology answered 1 hour ago

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