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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?
What are threads? A thread is alike to sequential programs. Single threads have a beginning, sequence and end. At any given point in time during the runtime of the thread there
A file system depends on data structures about the files, beside the file structure. The former is named metadata-data that defines data. Each file is accumulated with an inode, wh
The hardware to support demand paging is as follows Page table: This table has the skill to mark an entry invalid though a valid-invalid bit or particular value of protectio
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Suppose a logical address space is 1KB, and the page-size is 16 bytes. Assume no page is in the main memory for this process initially and the pure demand paging is used. Current f
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When you turn in an assignment to be graded in this class, you are making the claim that you neither gave nor received assistance on the work you turned in (except, of course, assi
___paging fecthces a page only when needed
Q. Describe the three main architectural layers of Windows XP? Answer: (1) The HAL (Hardware Abstraction Layer) creates operating system portability by hiding hardware differ
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