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What is meant by demand paging? Explain.
Demand paging is a technique to implement virtual memory. In demand paging simply when a page is required it is brought into memory. As an alternative of swapping the whole process into memory only the required pages are brought into the memory. Therefore it will not read pages which are not used and hence results in reduced swap time and memory needed.
For distinguishing the pages in memory and those on disk a valid invalid bit is used. If the bit is valid the page is in memory moreover the page is either not in memory or is not valid. The page table entry for a page that isn't currently in the memory is marked invalid.
Describe the differences between foreground and background processing. What advantage does background processing provide? 1. Background processes typically run with little or no
What are the main differences between operating systems for mainframe computers and personal computers? The design goals of operating systems for those machines are quite diffe
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What are the various categories of software? System software Application software Engineering/Scientific software Embedded software Web Applications Artificial I
List the various file attributes. A file has particular other attributes, which vary from one operating system to another, but typically having of these: Name, identifier, typ
What is an effector process? The effector process is a method that verifies itself.The effector process exists in particular criteria.
Gopher Gallery consists of a shopping mall and a cart ride that covers the 150 acre habitat. There are m visitors and n single-person vehicles. Visitors stroll around the mall at
Q. Why is it important to scale up system bus and device speeds as the CPU speed increases? Answer: Consider a system which carries out 50% I/O and 50% computes. Doubling-up
Explain about file allocation methods? The main problem in direct-access nature is how to assign space to these files so that disk space if utilized effectively and files can b
Q. Describe the three main architectural layers of Windows XP? Answer: (1) The HAL (Hardware Abstraction Layer) creates operating system portability by hiding hardware differ
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