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Define rotational latency and disk bandwidth.
Rotational latency is the additional time waiting for the disk to rotate the wanted sector to the disk head. The disk bandwidth is the total number of bytes transmitted, separated by the time among the first request for service and the completion of the last transfer.
Modern networks are not implemented as a single piece of software; that would render the task of dealing with multiple technologies and manufacturers virtually impossible. The solu
For reading, most operating systems use demand paging. This means that pages are only read from the disk into physical memory when they are needed. In the page table, there is a re
What is a reference string? An algorithm is evaluated by running it on a particular string of memory references and computing the number of page faults. The string of memory re
Q. Definition of Operating System? Definition of Operating System: • An Operating system is a program which controls execution of application programs and acts as an interfa
how it is work.
what are conditions
Evicting the most-recently used (MRU) page does very well on LRU's worst case. In general, however, MRU is a bad idea, since many programs exhibit temporal locality in their memory
How is a process chosen for being swapped either in or out? Swap out: a. If the process is idle. b. If process has been in main memory for a long time.
What are overlays? To enable a process to be larger than the amount of memory allocated to it, overlays are used. The idea of overlays is to keep in memory only those instructi
UNIX systems utilized to use disk-layout optimizations based on the rotation position of disk data however modern implementations including Linux simply optimize for sequential dat
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