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What are the three main purposes of an operating system?
_ To give an environment for a computer user to implement programs on computer hardware in a convenient and efficient manner.
_ To allocate the separate resources of the computer as required solving the problem given. The allocation process should be as fair and efficient as possible.
_ As a control program it serves two major functions: (1) supervision of the implementation of user programs to stop errors and improper use of the computer, and (2) management of the operation and control of I/O devices.
protection in operating system
What are the various file operations? The six basic file operations are Creating a file Reading a file Writing a file Repositioning within a file Tr
The scheduling technique in which CPU is allocated to the process with least CPU-burst time is known as Shortest job first Scheduling is a scheduling technique in which CPU i
single pass assembler
WHAT IS OPERATING SYSTEM ?ENLIST AND EXPLAIN BASIC SERVICES PROVIDE BY OS
The different paging techniques are 1. Multilevel paging or hierarchical paging method: In definite cases the page table may consist up to 1 million entries. This would be
Define throughput? Throughput in CPU scheduling is the number of processes that are completed per unit time. For long processes, this rate might be one process per hour; for sh
A hard-disk drive reads “120 GB HDD 7200 rpm 3 GB/sec transfer rate”. If the drive has a sector size of 512 bytes, what is the average rotational latency and transfer time to read
Define buffering. A buffer is a memory area that keeps data whereas they are transferred among two devices or among a device and an application. Buffering is done for three rea
The permission function is used to calculate what, if any access each class or level of user has to each file on a Unix machine. The permission task is one of the data components s
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