World Library  
Flag as Inappropriate
Email this Article

Uniform Memory Access

Article Id: WHEBN0004346277
Reproduction Date:

Title: Uniform Memory Access  
Author: World Heritage Encyclopedia
Language: English
Subject: Parallel computing, HyperTransport, Multiprocessing, Memory architecture, Cache invalidation
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Uniform Memory Access

Uniform memory access (UMA) is a shared memory architecture used in parallel computers. All the processors in the UMA model share the physical memory uniformly. In a UMA architecture, access time to a memory location is independent of which processor makes the request or which memory chip contains the transferred data. Uniform memory access computer architectures are often contrasted with non-uniform memory access (NUMA) architectures. In the UMA architecture, each processor may use a private cache. Peripherals are also shared in some fashion. The UMA model is suitable for general purpose and time sharing applications by multiple users. It can be used to speed up the execution of a single large program in time critical applications.[1]

Types of UMA architectures

  1. UMA using bus-based symmetric multiprocessing (SMP) architectures
  2. UMA using crossbar switches
  3. UMA using multistage interconnection networks

hUMA

In April 2013, the term "hUMA" (for heterogeneous Uniform Memory Access) began to appear in AMD promotional material to refer to CPU and GPU sharing the same system memory via cache coherent views. Advantages include an easier programming model and less copying of data between separate memory pools.[2]

See also

Notes

  1. ^ Advanced Computer Architecture, Kai Hwang, ISBN 0-07-113342-9
  2. ^ Peter Bright. AMD's "heterogeneous Uniform Memory Access" coming this year in Kaveri, Ars Technica, April 30, 2013.
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.