Q. 42 Three processes A,B and C each execute a loop of 100 iterations. In each
iteration of the loop, a process performs a single computation that requires tc
CPU milliseconds and then initiates a single I/O operation that lasts for tio
milliseconds. It is assumed that the computer where the processes execute has
sufficient number of I/O devices and the OS of the computer assigns different I/O
devices to each process. Also, the scheduling overhead of the OS is negligible. The
processes have the following characteristics:
Process id tc tio
A 100 ms 500 ms
B 350 ms 500 ms
C 200 ms 500 ms
The processes A,B and C are started at times 0, 5 and 10 milliseconds respectively,
in a pure time sharing system (round robin scheduling) that uses a time slice of
50 milliseconds. The time in milliseconds at which process C would complete its
first I/O operation is _________.
(A) 500
(B) 1000
(C) 2000
(D) 10000
Answer: (B)
Explanation:
