Data structure
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This document discusses memory management techniques. It defines memory and the memory hierarchy, including primary and secondary memory. It describes how the memory management unit handles memory by allocating, deallocating, and swapping between main memory and disk. It also discusses paging, fragmentation, defragmentation, and segmentation as memory management techniques.
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Data structure
- 3. “What goes around comes around whether you are giving respect to someone or deceiving them”
- 4. Objective • What is Memory? • Memory Hierarchy • Swapping • Paging Fragmentation • Defragmentation • Segmentation
- 5. What is memory? Memory store the programs & these programs are used by CPU for processing.
- 6. Memory Hierarchy Primary memory:- Main memory(Hard disk,RAM) Connected through data buses to CPU Expensive & Smaller Faster Secondary memory:- Extrenal Devices(CD , Floppy Disk etc) Connected through data cables to CPU Cheaper & larger Slower
- 7. Memory Management It’s a term used to describes how handle the memory. MMU(Memory Management Unit) MMU of the operating system handle the memory hierarchy.
- 8. How MMU Work? • Keep track what part of memory are in use • Memory Allocate • Memory Deallocate • Swapping b/w main memory & Disk
- 9. Swapping
- 11. Defragmentation • Defragmentation is like cleaning house for your PC, it picks up all of the pieces of data that are spread across your hard drive and puts them back together again.
- 14. 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.