(1) What is the turnaround time in s for J when Blocked I/O (also known as Programmed I/O) being used? (2) What is the turnaround time in s for J when interrupt-based I/O is being used?

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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Read carefully this description before you answer this problem. We have 5 pages to be printed. We
call the task of printing those five pages a Job, named J. Each of the subtasks is J1,J2,J3,J4,J5 that
corresponds to the printing of an individual page, and thus J contains J1-J5. Start time is t=0 for all
jobs. Job J completes when all jobs J1,J2, J3, J4,J5 get completed. Pages are printed one at a time.
Preparing a single page to print takes 3s of instruction execution by the CPU.
Printing it afterwards takes only printer time of 7s.
If an interrupt handling mechanism is used, after the printer completes the printing of the relevant
page 1s is spent for interrupt handling by the CPU. Interrupt handling has priority over other
processor tasks and it is considered overhead.
(1) What is the turnaround time in s for J when Blocked I/O (also known as Programmed I/O) is
being used?
(2) What is the turnaround time in s for J when interrupt-based I/O is being used?
Transcribed Image Text:Read carefully this description before you answer this problem. We have 5 pages to be printed. We call the task of printing those five pages a Job, named J. Each of the subtasks is J1,J2,J3,J4,J5 that corresponds to the printing of an individual page, and thus J contains J1-J5. Start time is t=0 for all jobs. Job J completes when all jobs J1,J2, J3, J4,J5 get completed. Pages are printed one at a time. Preparing a single page to print takes 3s of instruction execution by the CPU. Printing it afterwards takes only printer time of 7s. If an interrupt handling mechanism is used, after the printer completes the printing of the relevant page 1s is spent for interrupt handling by the CPU. Interrupt handling has priority over other processor tasks and it is considered overhead. (1) What is the turnaround time in s for J when Blocked I/O (also known as Programmed I/O) is being used? (2) What is the turnaround time in s for J when interrupt-based I/O is being used?
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