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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?
Q. What are the reasons for process suspension? Reasons for process suspension 1. Swapping 2. Timing 3. Interactive user request 4. Parent process request
What is independent process? A process is independent it cannot influence or be affected by the other processes implementing in the system. Any process does not share data with
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
File Organization * Sequential * Direct * Indexed A file still if it is stored on a magnetic disk or CD-ROM disk may perhaps have a sequential file organiz
Define properties of Real time operating system Real time :- Often used in a dedicated application, this system reads information from sensors and must respond within a fixed a
Deadlock Avoidance It's a method to evade deadlock by careful resource scheduling. This approach to the deadlock problem foresees deadlock before it actually occurs. This a
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draw a state diagram showing the transissions of a process from creation to termination
Explain Deadlock Every process in a set of processes is waiting for an event which only a process in the set can cause.
A set of methods that allow executing a program which is not completely in memory is called A set of methods that allow executing a program which is not completely in memory
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