Memory Management

Aug 26, 2012

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Memory Management

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1. 1 Memory Management

Memory Management

Memory Management. CS-502 Spring 2006. In the Beginning (prehistory) …. Batch systems One Program loaded in physical memory Runs to completion If job larger than physical memory, use overlays Identify sections of program that Can run to a result Can fit into the available memory

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Memory Management

Memory Management. Chapter 7. Memory Management. Subdividing memory to accommodate multiple processes Memory needs to be allocated efficiently to pack as many processes into memory as possible. Memory Management Requirements. Relocation

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Memory Management

Memory Management. The performance of the computer system depends mainly of:How much memory is available.How it is optimized while jobs are being processed.. Memory Management Schemes. Single-User Contiguous scheme.Fixed-partitions scheme.Dynamic partition scheme.Re-locatable dynamic partiti

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Memory Management

Memory Management. Basic memory management Swapping Virtual memory Page replacement algorithms. Chapter 4. Memory Management . Ideally programmers want memory that is large fast non volatile Memory hierarchy small amount of fast, expensive memory – cache

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Memory Management

Memory Management. 4.1 Basic memory management 4.2 Swapping 4.3 Virtual memory 4.4 Page replacement algorithms 4.5 Modeling page replacement algorithms 4.6 Design issues for paging systems 4.7 Implementation issues 4.8 Segmentation. Chapter 4. Agenda. 4.1 Basic memory management

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Memory Management

Memory Management. Chapter 7. Memory Management. It is the task carried out by the OS with support from hardware to accommodate multiple processes in main memory Effective memory management is vital in a multiprogramming system

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Memory Management

Memory Management. Chapter 7. Memory Management. Is the task carried out by the OS and hardware to accommodate multiple processes in main memory If only a few processes can be kept in main memory, then much of the time all processes will be waiting for I/O and the CPU will be idle

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Memory management

Memory management. Ingrid Verbauwhede Department of Electrical Engineering University of California Los Angeles. Literature.

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Memory management

Memory management. Memory Management. Background Overlays Swapping Contiguous Memory Allocation Paging Structure of the Page Table Segmentation Example: The Intel Pentium. Objectives. To provide a detailed description of various ways of organizing memory hardware

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Memory Management

Memory Management. CSCI 444/544 Operating Systems Fall 2008. Agenda. Background Address space Static vs Dynamic allocation Contiguous vs non-contiguous allocation . Background. Program must be brought into memory and placed within a process for it to be run

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Memory Management

Memory Management. 11. VirtualAlloc(). exec(). VMQuery(). shmalloc(). VirtualFree(). sbrk(). VirtualLock(). getrlimit(). ZeroMemory(). The External View of the Memory Manager. Application Program. File Mgr. Device Mgr. Memory Mgr. File Mgr. Device Mgr. Memory Mgr. Process Mgr.

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Memory Management

Memory Management. Memory or Storage. Real Memory physical main memory Virtual Memory storage conceived by users. Problem of Memory Management (1). How many jobs in memory at one time programs or processes Storage amount per job same size different size.

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Memory Management

Memory Management. 4.1 Basic memory management 4.2 Swapping 4.3 Virtual memory / Paging 4.4 Page replacement algorithms 4.5 Modeling page replacement algorithms 4.6 Design issues for paging systems 4.7 Implementation issues 4.8 Segmentation. Chapter 4. Memory Management .

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Memory Management

Memory Management. Exercise. At this point, J4 arrives requiring a block of 100K. Can J4 accommodated? Why or why not? If relocation is used, what are the contents of the relocation register for J1, J2, and J3 after compaction?

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Memory Management

Memory Management. Kathryn McKinley. About me. About You!. Course Logistics. Goals Presentations & Discussion Partner Written research problem identification and proposed solutions. Due date FIRM. Volunteers for next week?. Outline.

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Memory Management

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Memory Management

Memory Management. Dr. Adil Yousif. Memory Management. Subdividing memory to accommodate multiple processes Memory needs to be allocated efficiently to pack as many processes into memory as possible. Memory Management Requirements. Relocation

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Memory management

Memory management . Ref: Stallings G.Anuradha. What is memory management?. The task of subdivision of user portion of memory to accommodate multiple processes is carried out dynamically by the operating system and is known as memory management Memory management terms.

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Memory Management

Memory Management. Functions. OSMemCreate() Create a partition OSMemGet() Obtaining a memory block OSMemPut() Returning a memory block OSMemQuery() Obtaining status of a memory partition. Memory Control Blocks of μC/OS-II. Memory Partition. Multiple Memory Partitions.

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