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LRU evicts the page which was last accessed the farthest into the past of any page resident in physical memory, i.e. the least-recently used page. LRU approximates OPT when the recent past is a good prediction of the future, which is often true in real programs. Variants of the LRU policy are currently used in all real operating systems. We will discuss LRU further below. For certain patterns of memory accesses, however, LRU can be quite bad. For example, the worst case for LRU is a loop which is larger than the cache size (physical memory size in this case). In this situation, LRU will miss, or page fault, on every page access. So perhaps there are alternatives which are better than LRU?
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my Operating System is windows trust but when the windows start say its windows xp. help pleaes
FCFS (First Come, First Served) Perform operations in order requested No reordering of work queue No starvation every demand is serviced Poor performance
explain simple segmentation
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Did Abhinav agree to the initial timeline requested by Rebecca
How are file sharing and protection implemented? To execute file sharing and protection the system have to maintain more file and directory attributes than are needed on a sing
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