Knowledge in PAGE REPLACEMENT ALGORITHMS
MEMORY MANAGEMENT
Address is used to uniquely identify the location of something inside the CPU memory. These addresses are divided into two major types, the first being the logical address and the other, physical address. Both having different but some what similar functionality.The logical address serves as a virtual address which is viewable by the user program. The Physical address, however, is not view able directly by the user program and the logical address is utilized as a resource to access the physical address with the aid of a pointer. MEMORY ALLOCATION METHODS The allocation methods define how the files are stored in the disk blocks. There are three main disk space or file allocation methods. 1. Contiguous Allocation 2. Linked Allocation 3. Indexed Allocation PAGING: A computer can address more memory than the amount physically installed on the system. This extra memory is actually called virtual memory and it is a section of a hard that's set up to emulate the computer's RAM. Paging technique plays an important role in implementing virtual memory.Paging is a memory management technique in which process address space is broken into blocks of the same size called pages (size is power of 2, between 512 bytes and 8192 bytes). The size of the process is measured in the number of pages.Similarly, main memory is divided into small fixed-sized blocks of (physical) memory called frames and the size of a frame is kept the same as that of a page to have optimum utilization of the main memory and to avoid external fragmentation. SEGMENTATION: Segmentation is a memory management technique in which each job is divided into several segments of different sizes, one for each module that contains pieces that perform related functions.Each segment is actually a different logical address space of the program. VIRTUAL MEMORY: A computer can address more memory than the amount physically installed on the system. This extra memory is actually called virtual memory and it is a section of a hard disk that's set up to emulate the computer's RAM. PAGE REPLACEMENT ALGORITHMS: In operating systems that use paging for memory management, page replacement algorithm are needed to decide which page needed to be replaced when new page comes in. Whenever a new page is referred and not present in memory, page fault occurs and Operating System replaces one of the existing pages with newly needed page. Different page replacement algorithms suggest different ways to decide which page to replace. The target for all algorithms is to reduce number of page faults. (i)First In First Out (FIFO) (ii)Optimal Page replacement (iii)Least Recently Used (iv)Page buffering algorithm (v)Least frequently Used (LFU) algorithm (vi)Most frequently Used (MFU) algorithm ALLOCATION OF FRAMES: An important aspect of operating systems, virtual memory is implemented using demand paging.Demand paging necessitates the development of a page-replacement algorithm and a frame allocation algorithm. Frame allocation algorithms are used if you have multiple processes; it helps decide how many frames to allocate to each process.
Savita Savita
Data structures (programming)
This document contains information on linked list, binary search tree, algorithms and introduction to data structures.
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Algorithms and Problem Solving
The clip covers the important topics of Algorithms and Problem Solving
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Design and analysis of algorithms.
Design and Analysis of Algorithms (DAA) Materials & Notes. DAA Unit Wise Lecture Notes and Study Materials in pdf format for Engineering Students. So all students seeking Design and Analysis of Algorithms Book for engineering colleges.
Operating System - Virtual Memory
This clip contains introduction to virtual memory and explanations of the subtopics given below: 1. Optimal Page algorithm 2. First In First Out (FIFO) algorithm 3. Page Replacement Algorithm 4. Demand Paging 5. Reference String 6. Most frequently Used(MFU) algorithm 7. Least frequently Used(LFU) algorithm 8. Page Buffering algorithm 9. Least Recently Used (LRU) algorithm
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Page Replacement in OS
Page replacement algorithm is important algorithmic topic in operating system
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ALGORITHM AND EXAMPLE (First semester notes) Chapter-2 (Part-7) Makhanlal chaturvedi national University,Bhopal
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