'External fragmentation' presentation slideshows

Windows Kernel Internals User-mode Heap Manager. David B. Probert, Ph.D. Windows Kernel Development Microsoft Corporation. Topics. Common problems with the NT heap LFH design Benchmarks data Heap analysis. Default NT Heap. Unbounded fragmentation for the worst scenario:

CS252 Graduate Computer Architecture Spring 2014 Lecture 15: Virtual Memory and Caches. Krste Asanovic krste@eecs.berkeley.edu http:// inst.eecs.berkeley.edu /~cs252/sp14. Last Time in Lecture 14. Address translation Protection Virtual Memory. PC. D. E. M. W.

Files. uniform logical view of information storage mapped to physical devices: magnetic disks, magnetic tapes, and optical disks non-volatile ( ถึงไฟดับข้อมูลก็ยังอยู่ ต่างจากพวก volatile เช่น RAM). Physical device ไม่ได้ uniform. File Attributes. Name Identifier (id) Type

The Hardware/Software Interface CSE351 Winter 2013. Memory Allocation I. Data & addressing Integers & floats Machine code & C x86 assembly programming Procedures & stacks Arrays & structs Memory & caches Processes Virtual memory Memory allocation Java vs. C. Roadmap. C:. Java:.

Dynamic Memory Allocation: Basic Concepts CS220: Computer Systems II. Today. Basic concepts Implicit free lists. Top of heap ( brk ptr ). Dynamic Memory Allocation . Programmers use dynamic memory allocators (such as malloc ) to acquire VM at run time.

[2011-2] 시스템 프로그래밍 Class 10 : Dynamic Memory Allocation: Basic Concepts. 담당교수 : 최 윤 정 2011. 11.01. Today. Basic concepts Implicit free lists. Top of heap ( brk ptr ). Dynamic Memory Allocation . Application. Dynamic Memory Allocator. Heap. User s tack. Heap ( via malloc ).

Rensselaer Polytechnic Institute CSCI-4210 – Operating Systems David Goldschmidt, Ph.D. Operating Systems { week 12b }. Hierarchical storage architecture. very fast. very small. volatile. non-volatile. very slow. very large. Main memory (i).

L6: Malloc Lab Writing a Dynamic Storage Allocator October 30 , 2006. 15-213 “The course that gives CMU its Zip!”. Topics Memory Allocator (Heap) L6: Malloc Lab Reminders L6: Malloc Lab Due Nov 10, 2006 . Section A (Donnie H Kim) recitation8 .ppt (some slides from lecture notes).

Operating Systems. Memory Management (Ch 4: 4.1-4.2). Overview. Provide Services (done) processes (done) files (briefly here, more in cs4513) Manage Devices processor (done) memory (next!) disk (done after files). Simple Memory Management. One process in memory, using it all

File System Implementation. Chapter 12. File system Organization. Application programs Logical file system manages directory information manages file control blocks File-organization module Knows about logical blocks and physical blocks Basic file system

LEARNING OBJECTIVES. Data compression. Reclaiming space in files. Compaction. Searching. Sorting, Keysorting. Indexing. Data Compression. Data compression is a technique for encoding information in a file is such way as to take up less space Why perform data compression?

Template for the Storyboard stage. General Instructions: The template shown is an example. You can add more slides if required. Include images for explaining the concepts. Label the images.

Lecture 5. Memory Management Part I. Lecture Highlights. Introduction to Memory Management What is memory management Related Problems of Redundancy, Fragmentation and Synchronization Memory Placement Algorithms Continuous Memory Allocation Scheme Parameters Involved

Jonathan Walpole Computer Science Portland State University. CS 333 Introduction to Operating Systems Class 9 - Memory Management. Memory management. Memory – a linear array of bytes Holds O.S. and programs (processes) Each memory cell is named by a unique memory address

Operating Systems Lecture 35 Segmentation Read Ch. 9.5 - 9.6. Operator Overrides. To use some of the list functions, such as display( ), search( ) and valueInsert( ) or valueRemove( ), you need to override the output and comparison operators for your Process struct. Here's how:

LEARNING OBJECTIVES. Data compression. Reclaiming space in files. Compaction. Searching. Sorting, Keysorting. Indexing. Data Compression. Data compression is a technique for encoding information in a file is such way as to take up less space Why perform data compression?

Memory Management. Memory allocation Garbage collection. Memory Allocation. Memory pool : large block of contiguous memory Memory manager allocates memory by returning a handle to the user Use the term heap to refer to free memory accessed by a dynamic memory management scheme.

Consider. Starting with 160 k of memory do: Allocate p1 (50 k) Allocate p2 (30 k) Allocate p3 (40 k) Free p2 Allocate p4 (40 k) Free p3 Allocate p5 (60 k) Free p1 Allocate p6 (30k). Memory Allocation Algorithms. Design YOUR algorithm for allocation and deallocation of memory.

Writing You Own malloc() March 29, 2003. 15-213 “The course that gives CMU its Zip!”. Topics Explicit Allocation Data structures Mechanisms Policies. Adapted From Fall 2003 Lectures. class19.ppt. Process Memory Image. memory invisible to user code. kernel virtual memory. stack. %esp.

Consider. Starting with 160 k of memory do: Allocate p1 (50 k) Allocate p2 (30 k) Allocate p3 (40 k) Free p2 Allocate p4 (40 k) Free p3 Allocate p5 (60 k) Free p1 Allocate p6 (30k). Design YOUR algorithm for allocation and deallocation of memory. Memory Allocation Algorithms.