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Advantages And Disadvantages Of I/O

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Operating System I/O Methods
Superior University,
Department of Science and Technology, Gulberg III Lahore
Web: www.superior.edu.pk
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Mohsin Fazal mohsinfazal@yahoo.com
Muhammad Aslam aslamkmeo@gmail.com

Abstract
I/O is from the most important and major jobs which a computer performs. The I/O has the basic role in the management and controlling of the computer systems operations and in the control of the devices which are attached with it to perform a specific functions.
We discuss the I/O methods and services which an operating system performs to run the applications in the incarnation of I/O interface.
In the last section of the paper we discuss the performance aspects of I/O and the major rules of the operating system design that can make …show more content…

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We add up a new type of process to the system of speculative process. A speculative process is generated by forking a normal process the first time its block on disk request. Speculative process is completely breakdown when its parent process exist it.

The above picture illustrates the request which is clearly mentioned in the specific life cycle of a blocking request. According the information given by the picture I/O operation needs a lot of gigantic steps altogether to consume a marvelous number of CPU cycles and then the I/O operation is performed

4.1 Multiple threads performs I/O
Almost all of the applications we discussed issue I/O request from a large number of threads.
Among a lot or thousands of operating system threads only some applications are applied.

It is discussed that the this type of system is GUI based and the applications are also have the same nature. Long latency operations are keep themselves running in the

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