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Tech Operating System

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Submitted By j0eschilling1
Words 261
Pages 2
Operating Systems

Question#1
There is only two other possibilities
1. Process is blocked while it was in ready state.
2. Process running from blocked state.
Only transition 2 is possible because when it is possible that process is waiting for input that is yet not available and it is also possible that operating system has decided to allocate CPU time to any other process.
The transition 1 is not possible because when a process Is in ready state it cannot block itself while it is not waiting for input and only in ready state.
Question#2
In this problem we have five process i.e. Customer, order takers, cook, packaging specialists, cashiers.
We have sequential inter process communication between processes which uses pipes for communication between processes.
Our chain of communication should be like this

Customer
Order Takers
Cook
packaging specialists
Cashiers

Question#3
In this problem
T=Running time for any process
S=switch time for a process
Q=time Quantum
(a) Q = infinite
Process has infinite time quantum Q so it will run until it blocks itself
CPU efficiency=Q/Q+S
In reality it will be
CPU efficiency=T/T+S
Since it has infinite time quantum and switch time will be very little as compared to quantum
Then efficiency will be
CPU efficiency=T/T=1

(b) Q > T
In this case CPU has also time quantum greater than process completion time then its efficiency will be
CPU efficiency=Q/Q+S
This will be
CPU efficiency=T/T+S

(c) S < Q < T
Since
Q

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