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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. Requests in general arrive from a single process for one block or for a sequence of consecutive blocks. In these cases the FCFS is an economical method of disk scheduling. However LOOK is nearly as easy to program and will give much better performance when multiple processes are performing concurrent I/O such as when a Web browser retrieves data in the background while the operating system is paging as well as another application is active in the foreground.
Q. Presume that you have a page-reference string for a process with m frames (initially all empty). The page-reference string has length p along with n distinct page numbers
RESOURCE ALLOCATION GRAPH When a process Pi wishes an instance of resource type Rj, a request edge is inserted in the resource allocation graph. When this request is able to be
Hashed page tables A common approach for handling address spaces larger than 32 bits is to use a hashed page table. Every entry in the hash table having a linked list of elemen
Question : (a) In the demand paging system, when a process tries to access a page that was not brought into memory, a page fault occurs that involves a series of actions. The
breifly write a note on about evolution of operating system?
Operations that are to be performed on a directory are Search for a file: We are able to find all files whose names match a exact pattern. Create a file: New files requi
Define Ageing Ageing is a method of enhancing the priority of process waiting in Queue for CPU allocation
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How do we overcome the disadvantages of the two-level directory? Give links from one user directory to another, creating path names; system files become available by letting th
How can deadlocks be represented? Deadlocks are able to be described in terms of a directed graph called as a system resource-allocation graph. This graph contains of the foll
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