CSCI 114 (01): HW3 (Ch.7-8)

What is the 1st blank?

What is the 2nd blank?

Answer explanation

Process #0 is the 3rd priority level because priority is "3".

If add the execution time from 1st priority level to 3rd one:

1st priority + 2nd priority + 3rd priority

= Process #1 + Process #4 + Process #0

= 20 + 50 + 80

= "150"

What is the 3rd blank?

Answer explanation

Process #2 is the 4th priority level because priority is "4".

If add the execution time from 1st priority level to 4th one:

1st priority + 2nd priority + 3rd priority + 4th priority

= Process #1 + Process #4 + Process #0 + Process #2

= 20 + 50 + 80 + 10

= "160"

What is the 4th blank?

Answer explanation

Process #3 is the 5th priority level because priority is "5".

The waiting time means the total # of waiting time until the previous priority.

If add the execution time from 1st priority level to 4th one:

1st priority + 2nd priority + 3rd priority + 4th priority

= Process #1 + Process #4 + Process #0 + Process #2

= 20 + 50 + 80 + 10

= "160"

What is the 5th blank?

Answer explanation

Add each priority's waiting time:

--> total # of execution time from the 1st priority to the previous one.

1st priority = Process #1 = "0"

2nd priority = Process #4 = 0 + 20 = "20"

3rd priority = Process #0 = 20 + 50 = "70"

4th priority = Process #2 = 70 + 80 = "150"

5th priority = Process #3 = 150 + 10 = "160"

total # of waiting time / priority #

= (0+20+70+150+160) / 5

= 400 / 5

= "80"

What is the 1st blank?

What is the 2nd blank?

What is the 3rd blank?

What is the 4th blank?

What is the 5th blank?