Third Edition
Operating Systems Design and Implementation, Third Edition?
Hello all … please help me solving this problem I found on my textbook … any help appreciated !!!
1.A computer system has enough room to hold four programs in its main memory. These programs are each idle half the time waiting for I/O. What fraction of the CPU time is wasted?
textbook:
Operating Systems Design and Implementation, Third Edition
(chapter 4 problems , question No. 1)
It depends on whether the operating system is pre-emptive multitasking or co-operative and whether the IO is blocking or non blocking and what happens during the idle function.
If the idle does things properly it will pass control to the next task to do it’s thing while the other task is waiting for IO.
In which case. No CPU cycles are wasted except on the obvious task switching overheads which on a standard 386 based CPU is 192 cycles for a switch of TSS as far as I remember.
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