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What is meant by demand paging? Explain.
Demand paging is a technique to implement virtual memory. In demand paging simply when a page is required it is brought into memory. As an alternative of swapping the whole process into memory only the required pages are brought into the memory. Therefore it will not read pages which are not used and hence results in reduced swap time and memory needed.
For distinguishing the pages in memory and those on disk a valid invalid bit is used. If the bit is valid the page is in memory moreover the page is either not in memory or is not valid. The page table entry for a page that isn't currently in the memory is marked invalid.
Write a short note on peer-to-peer computing. Peer-to-peer (P2P) system model is a kind of distributed OS. In this model, clients and servers aren't distinguished from one anot
1. The City of Boston needs to be about 2 acres of green space per 1,000 persons. You have been hired as the GIS expert by an independent consulting company to determine where the
List sample file types, based on use, on the VAX under VMS. source programs (.BAS, .FOR, .COB, .PLI, .PAS, .MAR) data files (.DAT) text files (.TXT) command proced
Q. Suppose an operating system maps user-level threads to the kernel utilizing the many-to-many model where the mapping is done through the use of LWPs. In addition the system allo
Define deadlock prevention. Deadlock prevention is a set of process for ensuring that at least one of the four essential conditions like mutual exclusion, hold and wait, no pr
What advantages are there to this two-level directory? Users are isolated from each other. Users have more freedom in choosing file names.
FCFS (First Come, First Served) Perform operations in order requested No reordering of work queue No starvation every demand is serviced Poor performance
NEXT FIT ALGORITHM Here scanning starts from the first fit position and then it finds the next position which is large sufficient to hold the process. Thus the name next fit.
Explain Deadlock Every process in a set of processes is waiting for an event which only a process in the set can cause.
Allocators can also be used to avoid problems with unsafe languages. C and C++ are pervasive, with huge amounts of existing code. They are also memory-unsafe languages, in that the
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