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Evicting the most-recently used (MRU) page does very well on LRU's worst case. In general, however, MRU is a bad idea, since many programs exhibit temporal locality in their memory accesses, and MRU is effectively assuming that memory accesses will not exhibit locality.Another possibility is First-In, First-Out, or FIFO. At ?rst, this seems like it would be competitive with LRU, but it is not, since it also ignores temporal locality. For example, with a cache size of three, and the access pattern ABCAD, A would be evicted when D is loaded into the cache, which generally is not a good idea. (FIFO also has an unusual property called Belady's Anomaly in which for contrived examples, means that adding more memory to a system can cause more paging. So adding more physical memory to a computer using FIFO replacement could in theory make it slower. This cannot happen with LRU replacement.
UNIX systems utilized to use disk-layout optimizations based on the rotation position of disk data however modern implementations including Linux simply optimize for sequential dat
What are the three main activities of an operating system in regard to secondary-storage management? a) Free-space management. b) Storage allocation. c) Disk scheduling.
What lead to the concept of paging? The main memory is separated into two parts that are one for the resident operating system, and one for the user processes. We may perhaps p
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
The questions ask List four major functions of an OS. My answer: Function 1: Provide a user interface Function 2: Manage files Function 3: Manage hardware Function 4: Manage appli
Explain Components of conflict phase of dispatch latency The conflict phase of dispatch latency has two components 1. Preemption of any process running in the kernel. 2.
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Explain FIFO page replacement A FIFO replacement algorithm associates with every page the time when that page was brought into memory. When a page must be changed, the oldest p
Q. Explain some of the ways an application can use memory via the Win32 API. Answer: (1) Virtual memory offers several functions that allow an application to reserve and rele
Compare contiguous-memory allocation with pure paging in the following aspects: 1. In support of dynamic memory allocation: most systems allow programs to allocate more memory t
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