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Round Robin Turnaround Time

Discussion in 'Windows XP' started by llckll, Apr 8, 2004.

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  1. llckll

    llckll Thread Starter

    Joined:
    Apr 8, 2004
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    :confused: :confused: :confused:
    i'm not sure if this is the right place to post up a question like this, but i'm trying to review and learn some stuff on my own. this is about round-robin scheduling .. and the question goes something like this.....

    ------------------------
    suppose that we have a multiprogrammed computer in which each job has identical characteristics. In one computation period, T, for a job, 1/4 the time is spent in I/O and the other 3/4 in processor activity. Each job runs for a total of N periods. Assume that a simple round-robin scheduling is used, and that I/O operations can overlap with processor operation. Define the

    following quantities:
    -Turnaround Time (TAT) = actual time to complete a job
    -Throughput = average number of jobs completed per time period T
    -Processor utilization = percentage of time that the processor is active (not waiting)

    Compute these quantities for three simultaneous jobs, assuming that the period T is distributed in such a way that I/O is for first 1/4 and processor is for next 3/4.
    ------------------------------

    what i understand so far from doing research online is that....

    Tq = total quantum
    p = process
    q = quantum
    TAT = turnaround time

    TAT = (n-1)Tq and Tq = p x q

    and

    Throughput = (sum of) time for jobs to complete / Number of completed jobs

    i'm not really sure how to solve this problem.. any explanations will be great..

    thank you very much....
    :confused: :confused: :confused:
     
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