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Q. What is the major advantage of the layered approach to system design? What are the de-merits of using the layered approach?
Answer: As in all cases of modular design as well as designing an operating system in a modular way has several advantages. The system is simpler to debug and modify because changes affect only limited sections of the system rather than touching all sections of the operating system. Information is kept merely where it is needed and is accessible only within a defined and restricted area thus any bugs affecting that data must be limited to a specific module or layer.
How does user specify block to be fetched in direct access? By specifying the relative block number, relative to first block in file, which is block 0.
Invalid page fault :If a page fault happens for a reference to an address that's not part of the virtual address space, so that there could not be a page in memory corresponding
The dynamic memory allocator is a layer between the application and the OS, managing heap objects. When a program requests memory from the allocator (via malloc(), for instance), t
Explain external fragmentation? External fragmentation is the process where the free space and the space still available for use, in a piece of storage become separated into ma
Your task is to replace the round robin CPU scheduling scheme you developed in Practical 6 with a priority-based scheduling algorithm. To simplify matters, you can maintain the ori
Mention some attractive properties of semaphore? The Semaphores aren't provided by hardware. However they have numerous attractive properties: Machine indep
Q. Define Input - Output operations? Serial lines, Disks, tapes and other devices should be communicated with at a very low level. The user require only specify the device and
SCAN o Go from the outside to the inside servicing requests and after that back from the outside to the inside servicing requests. o Replicate this over and over. o Diminish
What are the advantages of multi threading? Multithreading a code can have several advantages. Improve application responsiveness --Any program in which var
what is difference between file descriptor and file pointer?
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