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Write a short note on disk scheduling
One of the responsibities of operating system O/S is to use the hardware efficiently. Whenever a process requires I/O to or from the disc it issues a system call to the operating system. The request state severer pieces of information:
If the disk controller and drive are available the request can be serviced immediately. If the controller or drive is busy any new request for service will be placed on the queue of pending request for that drive. For a multiprogramming system with several processes the disk queue may often have several pending requests. Therefore when request is accomplish the operating system chooses which pending request to service next.
Inverted page table In page table the page table has one entry for every page that the process is using. The operating system must translate this reference into a physical memo
For this exercise I wanted to give you some real-world examples of useful bash scripts. Therefore, you will write a couple of scripts that I actually use in my teaching to automate
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Q. What is the use of the command interpreter? Why is it generally separate from the kernel? Answer: It reads commands from the user or else from a file of commands and execu
Why are segmentation and paging sometimes combined into one scheme? Segmentation and paging are often combined in order to improve upon each other. Segmented paging is helpful
Interrupts The hardware mechanism that enables a device to inform the CPU is called an interrupt. The basic interrupt mechanism works as follows. The CPU hardware has a wire kn
Performance of demand paging Demand paging can have an important effect on the performance of a computer system. As long as there are no page faults, the effective access time
Parent and Child process communicate in unix A child and parent can interact through any of the normal inter-process communication schemes (pipes, message queues, sockets, s
UNIX systems utilized to use disk-layout optimizations based on the rotation position of disk data however modern implementations including Linux simply optimize for sequential dat
At the end of this lecture, and into the next lecture, we will discuss the last major type of logical error that can occurwhen programming with threads. A deadlock occurswhen two t
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