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What is an operating system?
An operating system is a program that manages the computer hardware. It acts as an intermediate among users of a computer and the computer hardware. It handles and coordinates the use of the hardware among the several application programs for the various users.
Define I/O and CPU Bursts Applications typically to through cycle of CPU bursts and Input/output bursts. Since the CPU sits idle during I/O operations, efficiency is improved
Q. Is disk scheduling except FCFS scheduling useful in a single-user environment? describe your answer. Answer: In a single-user environment the I/O queue typically is empty.
Determine the reasons for Poor response time Process busy or High I/O rates or High paging rates
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summary of what operating system do
Q. Presume that a distributed system is susceptible to server failure. What mechanisms would be needed to guarantee the exactly once semantics for execution of RPCs? Ans
Q. What are the reasons for process suspension? Reasons for process suspension 1. Swapping 2. Timing 3. Interactive user request 4. Parent process request
Q. Why do several systems store the operating system in firm ware and others on disk? Answer: For certain devices such like handheld PDAs and cellular telephones a disk with
benefits of dynamic linking
how does DMA increase system concurrency
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