dynamic memory organization
play

Dynamic memory organization Considering one possible approach (gnu) - PowerPoint PPT Presentation

Dec 05, 2022 •409 likes •473 views

Dynamic memory organization Considering one possible approach (gnu) to organize dynamic memory on the system side Give each application its own unique (virtual) memory space Allow that space to be subdivided into space for

  1. Dynamic memory organization ● Considering one possible approach (gnu) to organize dynamic memory on the system side ● Give each application its own unique (virtual) memory space ● Allow that space to be subdivided into space for threads/child processes the application may spawn ● Maintain data with each chunk of memory, free or in use, to track its size and status (support the allocate/free cycle) ● Maintain data structures to organize the chunks of free memory to effectively respond to allocate/free requests

  2. Arenas ● Each application given an “arena”, which controls the memory space for that application ● Arena has it’s associated memory stored in chunks in a heap (it controls division into chunks) ● Arena can subdivide its space into smaller arenas (e.g. use a chunk of its heap to create an arena for a child process) and/or smaller heaps (i.e. use a chunk of its heap to create another, smaller heap, for another purpose)

  3. Heaps ● Heap is section of memory, divided into chunks, each of which can be either free or allocated to application ● Heap can divide chunks into multiple smaller chunks, or coalesce adjacent free chunks into a single larger free chunk as needed ● Big “top” chunk of memory on heap kept free as long as possible, for cases when allocate requests can’t be satisfied from the other chunks

  4. Chunks ● Allocated chunks need to have the space the user requested, plus administrative data to support allocation and free operations ● Free chunks mostly empty, but part of space needs to be used for similar administrative information ● Admin info usually at beginning/end of chunks, so they are easily accessible by allocate/release routines

  5. Allocated chunk admin data ● At start of chunk: Size (bytes) ● Flag indicating which arena controls it ● Flag indicating if directly memory mapped (biiiig chunks) ● Flag indicating if preceding chunk is free or not ● ● Followed by user content

  6. Free chunk admin data ● At start of chunk: Total size of chunk ● Arena flag ● Is it memory mapped ● Is preceding chunk free or not ● Pointer to next chunk ● Pointer to previous chunk ● ● Most of chunk is unused while free ● At end of chunk: Size (again) ●

Download Presentation
Download Policy: The content available on the website is offered to you 'AS IS' for your personal information and use only. It cannot be commercialized, licensed, or distributed on other websites without prior consent from the author. To download a presentation, simply click this link. If you encounter any difficulties during the download process, it's possible that the publisher has removed the file from their server.

Recommend

Dynamic Memory Allocation Today Dynamic memory allocation mechanisms & policies

Dynamic Memory Allocation Today Dynamic memory allocation mechanisms & policies

Dynamic Memory Allocation Today Dynamic memory allocation mechanisms & policies Memory bugs Chris Riesbeck, Spring 2010 Original: Fabian Bustamante Wednesday, November 2, 2011 Dynamic memory allocation Application Dynamic

1.2k views • 47 slides
(Dynamic Strings) Personal Software Engineering Memory Organization The call stack grows from

(Dynamic Strings) Personal Software Engineering Memory Organization The call stack grows from

Memory Management in C (Dynamic Strings) Personal Software Engineering Memory Organization The call stack grows from the Function Call The top of memory down. Stack Frames sp Code is at the bottom of memory. Available The for Heap

556 views • 39 slides
(Dynamic Strings) Personal Software Engineering Memory Organization The call stack grows from

(Dynamic Strings) Personal Software Engineering Memory Organization The call stack grows from

Memory Management in C (Dynamic Strings) Personal Software Engineering Memory Organization The call stack grows from the Function Call The top of memory down. Stack Frames sp Code is at the bottom of memory. Available The

772 views • 39 slides
Dynamic Memory Management 333 Dynamic Memory Management Process Memory Layout Process Memory

Dynamic Memory Management 333 Dynamic Memory Management Process Memory Layout Process Memory

Dynamic Memory Management Dynamic Memory Management 333 Dynamic Memory Management Process Memory Layout Process Memory Layout (1) Each Linux process runs within its own virtual address space tables and the MMU (if available) security due to

1.25k views • 68 slides
Short Summery Classification according to memory organization distributed memory

Short Summery Classification according to memory organization distributed memory

Short Summery Classification according to memory organization distributed memory shared-address space Interconnection networks dynamic networks crossbar, bus-based, multistage (Omega network) Omega Network 2i,

251 views • 14 slides
Dynamic Memory Allocation CS 3410 Computer System Organization & Programming Note: these

Dynamic Memory Allocation CS 3410 Computer System Organization & Programming Note: these

Dynamic Memory Allocation CS 3410 Computer System Organization & Programming Note: these slides derive from those by Markus Pschel at CMU. 1 My favorite kind of cookie is A. Chocolate Chip B. Chocolate Chocolate Chip C. Oatmeal Raisin

968 views • 50 slides
Personal SE Computer Memory Addresses C Pointers Computer Memory Organization Memory is a

Personal SE Computer Memory Addresses C Pointers Computer Memory Organization Memory is a

Personal SE Computer Memory Addresses C Pointers Computer Memory Organization Memory is a bucket of bytes . Computer Memory Organization Memory is a bucket of bytes. Each byte is 8 bits wide. Computer Memory Organization Memory

994 views • 42 slides
Dynamic Memory Management Allocating memory: The Interface Buddy System

Dynamic Memory Management Allocating memory: The Interface Buddy System

CPSC 410/611 : Operating Systems Dynamic Memory Management Allocating memory: The Interface Buddy System Slab Allocation Reading: Doeppner, 3.3 Memory Areas Memory areas (regions) are intervals of legal

183 views • 5 slides
Dynamic memory networks for Dynamic memory networks for visual and textual question visual and

Dynamic memory networks for Dynamic memory networks for visual and textual question visual and

Dynamic memory networks for Dynamic memory networks for visual and textual question visual and textual question answering answering Stephen Merity (@smerity) Joint work with the MetaMind team: Caiming Xiong, Richard Socher, and more

378 views • 33 slides
Chapter 5 Internal Memory Contents Semiconductor main memory Organization DRAM and

Chapter 5 Internal Memory Contents Semiconductor main memory Organization DRAM and

Chapter 5 Internal Memory Contents Semiconductor main memory Organization DRAM and SRAM Types of ROM Chip logic Chip packaging Module organization Error correction Advanced DRAM organization Synchronous

304 views • 27 slides
Dynamic Memory Management The Linux Perspective Allocating memory: The

Dynamic Memory Management The Linux Perspective Allocating memory: The

CPSC 410/611 : Operating Systems Dynamic Memory Management The Linux Perspective Allocating memory: The Interface Buddy System Slab Allocation Reading: Silberschatz (8 th ed.), Chapters 9.8

447 views • 6 slides
Dynamic Memory Overview Dynamically allocated memory is stored in the Heap-section of

Dynamic Memory Overview Dynamically allocated memory is stored in the Heap-section of

Dynamic Memory Overview Dynamically allocated memory is stored in the Heap-section of memory. It is solely controlled by the programmer (unlike, for example, stack frames or read-only data). As a result, it is the programmers

269 views • 15 slides
Chapter 19 Data Structures - struct -dynamic memory allocation Data Structures A data structure

Chapter 19 Data Structures - struct -dynamic memory allocation Data Structures A data structure

Chapter 19 Data Structures - struct -dynamic memory allocation Data Structures A data structure is a particular organization of data in memory. We want to group related items together. We want to organize these data bundles in a way

951 views • 29 slides
Memory Management Thierry Sans Today's questions How to allocate free space? Dynamic Memory

Memory Management Thierry Sans Today's questions How to allocate free space? Dynamic Memory

Memory Management Thierry Sans Today's questions How to allocate free space? Dynamic Memory Allocation How to evict pages from memory? (a.k.a when to swap) Page Replacements Algorithms How much memory to give to each process?

516 views • 48 slides
Memory Management Guest lecture by Junfeng Yang Outline Dynamic memory allocation Stack

Memory Management Guest lecture by Junfeng Yang Outline Dynamic memory allocation Stack

COMS 3995: Networks, Operating Systems and Security Memory Management Guest lecture by Junfeng Yang Outline Dynamic memory allocation Stack Heap Heap allocation strategies Intro to memory management Paging 1 Dynamic

770 views • 43 slides
Monday Week 05 *op = '\0'; return out; // what is the precise effect? } 1/36 Dynamic Memory

Monday Week 05 *op = '\0'; return out; // what is the precise effect? } 1/36 Dynamic Memory

} Monday Week 05 *op = '\0'; return out; // what is the precise effect? } 1/36 Dynamic Memory Allocation BUG: the out variable is removed when lowerCase() returns. Statically allocated objects ... ... Dynamic Memory Allocation 4/36 are

446 views • 6 slides
Shared Memory Programming More about parallel loops LASTPRIVATE clause Sometimes need the

Shared Memory Programming More about parallel loops LASTPRIVATE clause Sometimes need the

Shared Memory Programming More about parallel loops LASTPRIVATE clause Sometimes need the value a private variable would have had on exit from loop (normally undefined). Syntax: Fortran: LASTPRIVATE(list) C/C++: lastprivate(list) Also

146 views • 14 slides
Welcome IT in AOS Michael Havas Dept. of Atmospheric and Oceanic Sciences McGill University

Welcome IT in AOS Michael Havas Dept. of Atmospheric and Oceanic Sciences McGill University

Welcome IT in AOS Michael Havas Dept. of Atmospheric and Oceanic Sciences McGill University September 21, 2012 Outline 1 Introduction to AOS IT Services 2 Introduction to Linux Benefits of Linux What Exactly is Linux? The Free-Software

985 views • 65 slides
Cross-Platform OpenCL Application Development Tyler Sorensen (led the work and made the slidese)

Cross-Platform OpenCL Application Development Tyler Sorensen (led the work and made the slidese)

The Hitchhikers Guide to Cross-Platform OpenCL Application Development Tyler Sorensen (led the work and made the slidese) Alastair F. Donaldson (delivered this version of the talk) Imperial College London, UK UKMAC May 2016 1 OpenCL

920 views • 77 slides
GN: A Modern Build System For BSD ? https://gn.googlesource.com/gn Bucharest, Septembre 23rd

GN: A Modern Build System For BSD ? https://gn.googlesource.com/gn Bucharest, Septembre 23rd

GN: A Modern Build System For BSD ? https://gn.googlesource.com/gn Bucharest, Septembre 23rd 2018 Benjamin Jacobs (Original) Motivation As an easy way to import LLVM into DragonFlyBSD base Under a (naive) assumption, given that: Upsream LLVM

469 views • 16 slides
Can a file system virtualize processors? Lex Stein, Microsoft Research Asia David Holland,

Can a file system virtualize processors? Lex Stein, Microsoft Research Asia David Holland,

Can a file system virtualize processors? Lex Stein, Microsoft Research Asia David Holland, Harvard University Margo Seltzer, Harvard University Zheng Zhang, Microsoft Research Asia A mystery: what is happening to Jos's program? throughput

350 views • 21 slides
Contiguous chunks of memory Arrays/strings: pointers and memory allocation int * a = new

Contiguous chunks of memory Arrays/strings: pointers and memory allocation int * a = new

Contiguous chunks of memory Arrays/strings: pointers and memory allocation int * a = new int[100]; Why not rely solely on string and vector classes? In C++ allocate using array form of new how are string and vector implemented? 0

196 views • 3 slides
Coffee break 10:30-11:00 WOW SUCH DITA-OT Upgrade to better engine MUCH PREPROCESS #ditaotday

Coffee break 10:30-11:00 WOW SUCH DITA-OT Upgrade to better engine MUCH PREPROCESS #ditaotday

Coffee break 10:30-11:00 WOW SUCH DITA-OT Upgrade to better engine MUCH PREPROCESS #ditaotday TL;DR Vanity Slide Jarno Elovirta jarno@elovirta.com @jelovirt https://github.com/jelovirt Agenda DITA-OT at block level

619 views • 30 slides
for VoD in the Cloud Chen Wang 1,2 , Hyong Kim 1 , Ricardo Morla 2 1 Department of ECE, Carnegie

for VoD in the Cloud Chen Wang 1,2 , Hyong Kim 1 , Ricardo Morla 2 1 Department of ECE, Carnegie

QoE Driven Server Selection for VoD in the Cloud Chen Wang 1,2 , Hyong Kim 1 , Ricardo Morla 2 1 Department of ECE, Carnegie Mellon University 2 Faculdade de Engenharia de Universidade do Porto IEEE CLOUD 2015, New York, USA 1 Challenges

682 views • 21 slides

More recommend