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Basic concepts
When a process is to be changed in, the pager guesses which pages will be used before the process is changed out again. Instead of swapping in a entire process, the pager brings only those essential pages into memory. The valid-invalid bit scheme can be used to distinguish among pages that are in memory and those pages that are on the disk. Access to a page marked unacceptable causes a page-default trap. This trap is the result of the operating system's failure to bring the needed page into memory.
Advantages and disadvantages of time-sharing operating system
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 operatin
what is internal fragmentation?
Determine the reasons for Poor response time Process busy or High I/O rates or High paging rates
Define Segmentation The memory allocation method subject to “external” fragmentation is Segmentation.
What is input output operation ?
Determine a critical section is a program segment Critical section is where shared resources are accessed
What do you mean by system calls? System calls give the interface among a process and the operating system. When a system call is implemented, it is treated as by the hardware
Compare 2 different operating systems.
Define the Global vs. local variables It is also important to discuss the scope of resources being granted to the application program. Variable scoping is defined as the acces
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