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Question :
The file system is the most visible aspect of an operating system. It provides the mechanism for on-line storage and access to both data and programs of the operating system and to all the users of the computer system.
(a) What is a file?
(b) Many systems require and open system call and a close system call. Explain the purpose of the open and close operations.
(c) Some systems automatically open a file when it is referenced for the first time, and close the file when the job terminates. What is the advantage and disadvantage of this scheme as compared to the more traditional one, where the user has to open and close the file explicitly?
(d) Just as a file must be opened before it is used, a file system must be mounted before it can be available to processes in the system. Describe the mount procedure that is performed by the operating system.
(e) Consider a file system where a file can be deleted and its disk space reclaimed while links to that file still exists.
I. What problems may occur if a new file is created in the same storage area or with same absolute path name?
II. How can these problems be avoided?
Q. Explain about Spooling? Acronym for simultaneous peripheral operations on line. Spooling denotes to putting jobs in a buffer, a special area in memory or on a disk where
Explain what ISAM is. Indexed sequential access method. The file is stored in sorted order. ISAM has a master index file, indicating in what part of another index file the key
Explain the steps in deadlock recovery. a) Exterminate off all processes involved - drastic. b) Exterminate off one at a time till deadlock gone - select a victim.
Define thrashing. Thrashing is the accident of high page traffic and low CPU utilization. It is observed that the cause of thrashing is an under-commitment of memory to program
Difference between cache and associate memory
Elimination of common sub expression during code optimization An optimizing transformation is a rule for rewriting a section of a program to enhance its execution efficiency wi
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what is dual mode operation
Long term scheduler calculates which processes are admitted to the machine for processing. It accepts the degree of multiprogramming. Once accepted, a job converts a process.
explain how indefinite blocking or starvation occurs..
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