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Q. In a disk jukebox what would be the result of having more open files than the number of drives in the jukebox?
Answer: Two bad results could result. One likelihood is starvation of the applications that issue blocking I/Os to tapes that aren't mounted in drives. Likelihood is thrashing as the jukebox is commanded to switch tapes after every I/O operation.
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The producer-consumermodel above has a standard human analogy of an assembly line. Humans have specialized skills, however, whereas threads running the same program do not need to
expalin about the design issues of network operating system
Optimal page replacement An optimal page replacement algorithm has the least page fault rate of all algorithms. The algorithm states that a 'replace the page that will not be
Q. Why is it complicated to protect a system in which users are allowed to do their own I/O? Answer: In earlier chapters we identified a distinction among kernel and user mod
What is the use of multiprogramming on individual processors ? In the usual multiprocessor, which is dealing with independent or coarse-grained synchronization granularity, it i
What are files and explain the access methods for files? File definition Attributes, operations and types Direct access Sequential access with diagram Other access
What is the MFD? UFD? How are they related? MFD is master-file directory, which points to the UFDs. UFD is user-file directory, which points to each of user's files.
You are required to study the important system components, including important data structures, important functions and algorithms, and the various organizational, structural, logi
Garbage collectors trade space for time. If we collect all the time (which requires a lot of processing time), the GC allocator will use the least memory possible. On the other han
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