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Category > Computer Science Posted 20 Nov 2017 My Price 10.00

relationship among disk platters, tracks, sectors, and clusters.

Hi, need help with the quiz, for PART II solutions. Please provide answers showing work.

Discussions Wk6D

 

Part I

 Explain the relationship among disk platters, tracks, sectors, and clusters.

 

Solution:

Hard disks have Metal or glass disks called platters, which are divided into sectors. sectors are divisions of concentric circles called tracks. Groups of sectors are called clusters.

 

Part II

 

Given the following sequence of events (Interrupt requests IRQi), show which services routines the CPU is executing for times 0 to 100 ms. Consider that each IRQi- Interrupt service routine takes 15 ms to complete.

Time    Action                                                                            

   0 ms            Start of main program

10 ms   IRQ3 Interrupt request 3 is coming

20 ms   IRQ2 Interrupt request 2 is coming

45 ms   IRQ1 Interrupt request 1 is coming

60 ms   IRQ0 Interrupt request 0 is coming

 

IRQ n has the lowest priority; IRQ 0 has the highest priority

Obs:

If IRQi is coming in the period of execution of IRQj and j has higher priority, then IRQi is postponed until IRQj is finished.

If IRQi is coming in the period of execution of IRQj and i has higher priority, then IRQi is started and IRQj is temporally suspended until IRQi is finished.

 

Indication:

Please see here a similar example considering each IRQ service routines takes 20 ms to complete.

 

Given the following sequence of events (Interrupt requests IRQi), show which services routines the CPU is executing for times 0 to 100 ms. Consider that each IRQi- Interrupt service routine takes 20 ms to complete.

Time    Action

   0 ms            Start of main program

10 ms   IRQ3 Interrupt request 3 is coming

20 ms   IRQ2 Interrupt request 2 is coming

45 ms   IRQ1 Interrupt request 1 is coming

60 ms   IRQ0 Interrupt request 0 is coming

 

IRQ n has the lowest priority; IRQ 0 has the highest priority

Obs:

If IRQi is coming in the period of execution of IRQj and j has higher priority, then IRQi is postponed until IRQj is finished.

If IRQi is coming in the period of execution of IRQj and i has higher priority, then IRQi is started and IRQj is temporally suspended until IRQi is finished.

 

 

The solution for 20 ms is:

 

 

 

 

 

More details is presented in the following figure:

 

 

 

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Answers

SophiaPretty
(5)
Status NEW Posted 20 Nov 2017 07:11 AM My Price 10.00

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