Round robin Scheduling

[Rahul Shah]

Suppose the time quanta in round robin is 2 ms but the first process
P1 which starts executing from 0 sec has CPU burst of only 1 sec so
the process releases the CPU at 1 sec. So now the next process starts,
P2 which has longer CPU burst than the time quanta. The question is
whether the time quanta adjust itself to start from this 1 sec for
process 2(since the P2 started from 1 sec) i.e does P2 preempts at 3rd
sec or 4th sec??

[Partha Dasgupta]

This one is sort of undefined, but the second process should get the full 2 secs. Some schedulers always use a fixed time for preemption and this would mean the second process only gets 1 sec. This may be considered wrong, but it is not a big deal.

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Partha Dasgupta,
School of Computing Informatics, Arizona State University
EMail: par...@asu.edu
http://cactus.eas.asu.edu/partha

[Rahul Shah]

ok.