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I've got a confusion in the following section of a book. Here we taking about FCFS Scheduling. I feel that calculation table is incorrect in the book. Because P3 got completed at time 7, it's turnaround time should be 7-3 because third process arrival time is 3 so why they take 1? Remember turn around time = t(process completed)-t(process submitted)

For P4 it's 11-4 which I feel wrong again. Further for P5. So I want to know whether I'm wrong in understanding this all or the following is really a wrong calculation. Can someone please explain. Thanks! Check the fallowing links for book scan: http://i.stack.imgur.com/oGtva.jpg http://i.stack.imgur.com/mVP03.jpg

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migrated from cstheory.stackexchange.com Feb 10 '13 at 6:24

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However I gave a quick look at the tables and it seems that you are right: for P3, P4, P5 the table wrongly reports (completion time - processing time) instead of (completion time - arrival time). And as a consequence the waiting times on the rightmost column are also wrong. –  Vor Feb 9 '13 at 11:16
    
@MarzioDeBiasi thanks ! I will remember your suggestion in further posts ! –  user1938918 Feb 9 '13 at 11:26

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