Exam (elaborations)
Csci 340 Set 1 Questions and answers latest update
- Course
- CSCI 340
- Institution
- University Of Illinois - Chicago
Csci 340 Set 1 Questions and answers latest update
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Csci 340 Set 1System calls invoked by user programs are executed under ANS✔✔ Kernel
mode
Suppose that an operating system kernel is designed such that after sending an
I/O request to a device controller, the kernel periodically inquires with the
device controller about the status of that I/O request. What do we call this
behavior? ANS✔✔ Polling
After DMA is introduced into a computer system, to what extent are hardware
I/O interrupts utilized by device controllers in file read operations ANS✔✔
One interrupt will be generated per each block read
In the lectures we discussed an approach to finding the minimum number in
an unsorted file of 10,000 numbers utilizing a multithreaded patttern with a
main thread and 10 pthreads. How many comparisions does the main thread
perform after all 10 pthreads terminate? ANS✔✔ Between 101 and 1000
Choose those items which are features of direct memory access (DMA).
ANS✔✔ 1.
The CPU is able to do more productive work.
2.
Traffic is reduced on the system bus.
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