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The physical memory acts as a cache backed by the disk. When the physical memory is full, and we want to read in another page from disk, we have to evict a page from physical memory. How do we choose which page to evict? This is determined by the cache replacement policy. Note that in a theoretical algorithms course, you are generally interested in the worst-case asymptotic performance of an algorithm. In building systems, worst-case performance can be important (for instance, in systemswith real-time requirements), but oftenwe canmost about the algorithm's performance for the most common case. If a particular algorithm has good worst-case performance, but bad common-case performance, it is a bad algorithm.
What are the common strategies to select a free hole from a set of available holes? The most common methods are a. First fit b. Best fit c. Worst fit
explain the link between operations management and strategic planning of daily goods shop
PART A Question 1 Using your own words, explain what a continuous random variable and a continuous probability density function are. Give examples. Question 2 Gi
Describe paging technique used in UNIX systems. When a process begin in UNIX, not every its memory pages are read in from the disk at once. In its place, the kernel loads into
What are the main advantages of the microkernel approach to system design? Benefits typically contain the following (a) Adding a new service does not require modifying the
What are the various disk-scheduling algorithms? The several disk-scheduling algorithms are a. First Come First Served Scheduling b. Shortest Seek Time First Scheduling
A friend has promised to log in at a particular time. However, he needs to be contacted as soon as he logs in. The shell script checks after every minute whether he has logged in o
In a multiprogramming and time-sharing environment, several users share the system simultaneously. This situation can result in various security problems. a
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.
In which page replacement policy Balady’s anomaly occurs? FIFO (First in First Out)
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