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The optimal replacement policy, called OPT, is to evict the page which will be accessed farthest into the future. Since we can't predict the future precisely, we can't implement OPT in any real system. We can, however, run OPT on a saved trace of memory accesses, to measure how our real algorithm compares with OPT for a given trace.
Define busy waiting and spinlock. When a process is in its significant section, any other process that tries to enter its critical section must loop continuously in the entry c
Describe the differences between foreground and background processing. What advantage does background processing provide? 1. Background processes typically run with little or no
How do we keep track of where the free pieces of memory are? One idea is to maintain a set of linked-lists of free space; each linked-list will store free chunks of some given size
Problem: a) To ensure proper operation, the operating system and all the other programs must be protected from any malfunctioning program. Describe a mechanism which is impleme
The scheduling technique in which CPU is allocated to the process with least CPU-burst time is known as Shortest job first Scheduling is a scheduling technique in which CPU i
Explain a boot control block A boot control block can have the information required by the system to boot an operating from that partition. If the disk does not have an operati
Q. What are the tradeoffs concerned in rereading code pages from the file system versus using swap space to store them? Answer: If codes pages are accumulate in swap space th
Q. What is the occupation of the object manager? Answer: Substance present a generic set of kernel mode interfaces to user mode programs. Objects are influenced by the execut
Explain FIFO page replacement A FIFO replacement algorithm associates with every page the time when that page was brought into memory. When a page must be changed, the oldest p
Locality of reference entails that the page reference being made by a process Locality of reference entails that the page reference being made by a process is similarly to be
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