'Internal fragmentation' diaporamas de présentation

CS 333 Introduction to Operating Systems Class 9 - Memory Management

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Dynamic Memory Allocation

Dynamic Memory Allocation. Topics Simple explicit allocators Data structures Mechanisms Policies. Harsh Reality. Memory Matters Memory is not unbounded It must be allocated and managed Many applications are memory dominated Especially those based on complex, graph algorithms

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[2011-2] ??? ????? Class 11 : Dynamic Memory Allocation: Advanced Concepts

[2011-2] ??? ????? Class 11 : Dynamic Memory Allocation: Advanced Concepts. ???? : ? ? ? 2011. 11. 1. Today. Explicit free lists Segregated free lists Garbage collection Memory-related perils and pitfalls. Keeping Track of Free Blocks. 5. 4. 6. 2. 5. 4. 6. 2.

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Files

Files. Organizing Files for Performance. Overview. In this lecture, we continue to focus on file organization, but with a different motivation. This time we look at ways to organize or re-organize files in order to improve performance. Outline. We will be looking at four different issues:

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One Seek File System

One Seek File System. Sharath R. Cholleti sharath@cs.wustl.edu. Center for Distributed Object Computing Department of Computer Science and Engineering Washington University. Fall 03 E71 CS 6785 Programming Languages Seminar 07 Nov 2003. Outline. Fixed size blocks file system

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Malloc Recitation

Malloc Recitation. Section K (Kevin Su) November 5 th , 2012. Agenda. Macros / Inline functions Quick pointer review Malloc. Macros / Inline Functions. Macros. Runtime, compile-time, or pre-compile time? Constant: #define NUM_ENTRIES 100 OK Macro #define twice(x) 2*x Not OK

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Malloc Recitation

Malloc Recitation. By sseshadr. Agenda. Macros in C Pointer declarations Casting and Pointer Arithmetic Malloc. Macros. Macros. Runtime, compile-time, or pre-compile time? Constant: #define NUM_ENTRIES 100 OK Macro #define twice(x) 2*x Not OK twice(x+1) becomes 2*x+1

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Memory Problems (I.1.1)

Memory Problems (I.1.1). Prof. Sin-Min Lee Department of Mathematics and Computer Science. The code and any static data will not grow or shrink during execution. A processes logical addresses are usually contiguous in the range (0,N-1).

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Lecture 9: SHELL PROGRAMMING (continued) Creating shell scripts!

Lecture 9: SHELL PROGRAMMING (continued) Creating shell scripts!. NAME chex-change a file to be executable SYNOPSIS chex filename

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Operating Systems

Operating Systems. Fixed/Variable Partitioning. Real Memory Management. Background Memory Management Requirements Fixed/Static Partitioning Variable/Dynamic Partitioning Simple/Basic Paging Simple/Basic Segmentation Segmentation with Paging. Contiguous Allocation.

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Csci 2111: Data and File Structures Week4, Lectures 1 & 2

Csci 2111: Data and File Structures Week4, Lectures 1 & 2. Organizing Files for Performance. Overview. In this lecture, we continue to focus on file organization, but with a different motivation. This time we look at ways to organize or re-organize files in order to improve performance.

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Csci 2111: Data and File Structures Week4, Lectures 1 & 2

Csci 2111: Data and File Structures Week4, Lectures 1 & 2. Organizing Files for Performance. Overview. In this lecture, we continue to focus on file organization, but with a different motivation. This time we look at ways to organize or re-organize files in order to improve performance.

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Memory Management

Memory Management. CS 470 - Spring 2002. Overview. Partitioning, Segmentation, and Paging External versus Internal Fragmentation Logical to Physical Address Mapping Placement Algorithms First Fit, Next Fit, and Best Fit Buddy System Intel X86 Memory Mapping Mechanisms

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Operating Systems Lecture 35 Segmentation Read Ch. 9.5 - 9.6

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:

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Clustered Pivot Tables for I/O-optimized Similarity Search

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Memory Management

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.

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Tutorial 8

Tutorial 8. Exercises CH8. 8.1 Name two differences between logical and physical addresses. 8.1 Name two differences between logical and physical addresses. 8.1 Name two differences between logical and physical addresses .

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CS 4284 Systems Capstone

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CGS 3763 Operating Systems Concepts Spring 2013

CGS 3763 Operating Systems Concepts Spring 2013. Dan C. Marinescu Office: HEC 304 Office hours: M- Wd 11:30 - 12:30 A M. Last time: Memory hierarchies. Binary image; swapping Contiguous allocation of the main memory Physical, logical, and virtual addresses

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