Identifying Process States and System Resources - Practice Questions

Question 1

1. Assume that at time 5 no system resources are being used except for the processor and memory. Now consider the following events:
   • At time 5: P1 executes a command to read from disk unit 3.
   • At time 15: P5’s time slice expires.
   • At time 18: P7 executes a command to write to disk unit 3.
   • At time 20: P3 executes a command to read from disk unit 2.
   • At time 24: P5 executes a command to write to disk unit 3.
   • At time 28: P5 is swapped out.
   • At time 33: An interrupt occurs from disk unit 2: P3’s read is complete.
   • At time 36: An interrupt occurs from disk unit 3: P1’s read is complete.
   • At time 38: P8 terminates.
   • At time 40: An interrupt occurs from disk unit 3: P5’s write is complete.
   • At time 44: P5 is swapped back in.
   • At time 48: An interrupt occurs from disk unit 3: P7’s write is complete.

At time 22  identify which state each process is in:

Question 2

1. Assume that at time 5 no system resources are being used except for the processor and memory. Now consider the following events:
   • At time 5: P1 executes a command to read from disk unit 3.
   • At time 15: P5’s time slice expires.
   • At time 18: P7 executes a command to write to disk unit 3.
   • At time 20: P3 executes a command to read from disk unit 2.
   • At time 24: P5 executes a command to write to disk unit 3.
   • At time 28: P5 is swapped out.
   • At time 33: An interrupt occurs from disk unit 2: P3’s read is complete.
   • At time 36: An interrupt occurs from disk unit 3: P1’s read is complete.
   • At time 38: P8 terminates.
   • At time 40: An interrupt occurs from disk unit 3: P5’s write is complete.
   • At time 44: P5 is swapped back in.
   • At time 48: An interrupt occurs from disk unit 3: P7’s write is complete.

At time 37  identify which state each process is in:

Question 3

1. Copy of

Assume that at time 5 no system resources are being used except for the processor and memory. Now consider the following events:

• At time 5: P1 executes a command to read from disk unit 3.
• At time 15: P5’s time slice expires.
• At time 18: P7 executes a command to write to disk unit 3.
• At time 20: P3 executes a command to read from disk unit 2.
• At time 24: P5 executes a command to write to disk unit 3.
• At time 28: P5 is swapped out.
• At time 33: An interrupt occurs from disk unit 2: P3’s read is complete.
• At time 36: An interrupt occurs from disk unit 3: P1’s read is complete.
• At time 38: P8 terminates.
• At time 40: An interrupt occurs from disk unit 3: P5’s write is complete.
• At time 44: P5 is swapped back in.
• At time 48: An interrupt occurs from disk unit 3: P7’s write is complete.

At time 47  identify which state each process is in:

Question 4

1. Name and describe the different states that a process can exist in at any given time.