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Topic: Locality of reference

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Locality principle

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	Locality of reference - Wikipedia, the free encyclopedia
		In computer science, locality of reference, sometimes also called the principle of locality, is a concept which deals with the process of accessing a single resource multiple times.
		Increasing and exploiting locality of reference are common techniques for optimization.
		A cache is a simple example of exploiting temporal locality, because it is a specially designed faster but smaller memory area, generally used to keep recently referenced data and data near recently referenced data, which can lead to potential performance increases.
	en.wikipedia.org /wiki/Locality_of_reference (396 words)

	Locality - Wikipedia, the free encyclopedia
		Specifically, the term "locality" is used by the United States Board on Geographic Names to refer to the name of a place that is neither a legally incorporated or defined entity (like a township or city), nor a specific geographical feature such as a river or mountain.
		In statistics, locality is used to mean the central tendency of a data set.
		While conventional measures of locality, such as arithmetic mean are often seen as the most straightforward way to describe locality, they are very sensitive to outliers.
	en.wikipedia.org /wiki/Locality (266 words)

	Locality of reference: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-07)
		There are three basic types of locality of reference: temporal, EHandler: no quick summary.
		Increasing and exploiting locality of reference are common techniques for optimization optimization (computer science) quick summary:
		In a computing environment, burst mode refers generically to any situation in which a device is transmitting data repeatedly without waiting for input from another...
	www.absoluteastronomy.com /encyclopedia/l/lo/locality_of_reference.htm (926 words)

	EECS News and Events
		The performance of demand-driven caching is known to depend on the locality of reference exhibited by the stream of requests made to the cache.
		More specifically, we focus on two "folk theorems," namely (i) The stronger the locality of reference, the smaller the miss rate of the cache; (ii) Good caching is expected to produce an output stream of requests exhibiting less locality of reference than the input stream.
		As we propose to measure strength of locality of reference in a stream of requests through the skewness of its popularity distribution, we introduce the notion of majorization as a means of capturing this degree of skewness.
	www.eecs.umich.edu /eecs/etc/events/abst.cgi?264 (296 words)

	Cache - Wikipedia, the free encyclopedia
		Caches have proven extremely effective in many areas of computing because access patterns in typical computer applications have locality of reference.
		There are several sorts of locality, but we mainly mean that the same data are often used several times, with accesses that are close together in time, or that data near to each other are accessed close together in time.
		Should a read reference the data at the destination of a queued write, the write's data will be returned.
	en.wikipedia.org /wiki/Cache (1744 words)

	HeadStart Online (Site not responding. Last check: 2007-11-07)
		Depending on the locality of reference pattern of the program, the SRAM may be mostly used allowing the processor to run at peak performance.
		Locality of reference has a direct impact on the performance of a program.
		In general we can assume that good locality of reference on multi-dimensional arrays is achieved when (Fortran) array indices change in the order of their rank (i.e.
	cch.loria.fr /documentation/PCA/Marchand/serial_opt.html (2313 words)

	Reference locality. (Site not responding. Last check: 2007-11-07)
		The next time the HTML file is referenced, we form another locality set in the same manner and compare its file members with those of the primordial locality set.
		The average hit rate (the ratio between the size of the latter sets and the size of the primordial set) across all references is 47%.
		We also studied the size of the locality sets in bytes, and found that 42% are 32 KB or smaller, 62% are 64 KB or smaller, 73% are 96 KB or smaller, and 80% are 128 KB or smaller.
	usenix.org /events/usenix01/full_papers/shriver/shriver_html/node7.html (274 words)

	Intrepid Blog » Blog Archive » Virtual locality of reference (Site not responding. Last check: 2007-11-07)
		Quite a lot of programmers consider the advantages of locality of reference; if they put all the data they work with in about the same space the processor will be able to retreive them more easily, for the processor caches regions of memory in the Lx caches.
		One implication this has on locality of reference is that a seamingly contiguous piece of memory can in physically be distributed over quite a big span of real physical memory.
		I want people that trade of literally everything for their holy locality of reference to see that it’s just a nice extra, but that it just doesn’t always work due to fragmentation of the physical memory.
	blog.w-nz.com /archives/2006/02/07/virtual-locality-of-reference (559 words)

	CS Colloquium --- Sivan Toledo (Site not responding. Last check: 2007-11-07)
		Locality of Reference in Sequential and Parallel Numerical Algorithms
		Locality of reference is the ability of an algorithm to extensively use data that is stored close to the processor, rather than access data that is stored in distant memories (down the memory hierarchy or on other nodes in a distributed-memory parallel computer).
		Locality of reference is a key determinant of the performance of an algorithm on many computers.
	www.math.tau.ac.il /~matias/99-SPRING-TALKS/sivan.html (208 words)

	Rico Mariani's Performance Tidbits : Locality of reference and performance (Site not responding. Last check: 2007-11-07)
		Even if you have some temporary objects that intervene they won't mess up your long term locality of reference because those objects will be squeezed away at the next collection.
		just read this over my shoulder and he said "Don't forget to remind the nice people that the data that has best locality of reference is the data that's not there at all." Truer words were never spoken.
		Be mindful when using data structures that are heavy in pointers, those pointers will cost you space, and even though the little arrow you draw for the pointer on your whiteboard might be short, it surely doesn't mean that the distance between the objects is small, unless you made it so.
	blogs.msdn.com /ricom/archive/2003/12/02/40782.aspx (1308 words)

	Citebase - Truly Online Paging with Locality of Reference
		We also observe that our algorithms adapt themselves to temporal changes in the locality of reference.
		We model temporal changes in the locality of reference by extending the access graph model to the so called extended access graph model, in which many vertices of the graph can correspond to the same virtual page.
		We define a measure for the rate of change in the locality of reference in G denoted by Delta(G).
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:cs/0601127 (553 words)

	Howstuffworks "How Caching Works"
		Let's take a look at the following pseudo-code to see why locality of reference works (see How C Programming Works to really get into it):
		This 95%-to-5% ratio (approximately) is what we call the locality of reference, and it's why a cache works so efficiently.
		This is also why such a small cache can efficiently cache such a large memory system.
	computer.howstuffworks.com /cache6.htm (298 words)

	Law Reviews (Site not responding. Last check: 2007-11-07)
		The tactics employed by the Hostage Rescue team follow a military strategy, and casualties are expected; "strike first, strike hard, no compromise" is the message.
		The book contains extensive footnotes and source references, quoting FBI agents and high-ranking officials on the record by name, rather than by quoting "anonymous sources"...
		Locally we made our friends Bea Brickeys plain pine box per her wishes.
	www.e-book-store.com /Law/Law_220.html (3225 words)

	Optimizing Locality of Reference (ResearchIndex) (Site not responding. Last check: 2007-11-07)
		If your firewall is blocking outgoing connections to port 3125, you can use these links to download local copies.
		Abstract: This paper shows how the symmetric eigenproblem, which is the computationally most demanding part of numerous scientific and industrial applications, can be solved much more efficiently than by using algorithms currently implemented in Lapack routines.
		0.9: Optimizing Locality of Reference in Symmetric Eigensolvers - Gansterer, Kvasnicka, al.
	citeseer.ist.psu.edu /697291.html (167 words)

	Indian Mountain, Cherokee Co., Alabama, USA (Site not responding. Last check: 2007-11-07)
		Important Disclaimer: This locality information is for reference purposes only.
		You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
		Locality, mineral & photograph data are the copyright of the individuals who submitted them.
	www.mindat.org /loc-4123.html (141 words)

	Cache (Site not responding. Last check: 2007-11-07)
		Caches have proved extremely effective in many areas of computing, because access patterns in typical computer applications have locality of reference.
		Small memories on or close to the CPU chip can be made faster than the much larger main memory.
		Command queueing is different from write acceleration in that the main computer's operating system is notified when data is actually written onto the magnetic media.
	www.free-download-soft.com /info/cache.html (1032 words)

	locality from FOLDOC (Site not responding. Last check: 2007-11-07)
		In sequential architectures programs tend to access data that has been accessed recently (temporal locality) or that is at an address near recently referenced data (spatial locality).
		Thus to efficiently employ many processors on a problem we must increase the proportion of references which are to local memory.
		Previous: local area network, Local Area Transport, local bus, locale, localisation, localised
	www.instantweb.com /D/dictionary/foldoc.cgi?locality (117 words)

	OSR's ntfsd List: memory management question
		Since the structures are allocated from paged pool, I can imagine that it would be beneficial to allocate the structures from a contiguous heap of memory to preserve 'locality of reference': one page fault will bring in tens or hundreds of these structures reducing overall paging of the system as these structures are accessed.
		Looking at the DDK documentation, it seems that 'zones' were designed to address this issue, however, they have been declared obsolete.
		The documentation suggests 'lookaside lists', although lookaside lists seem to address a different need than did zones; lookaside lists seem not to be designed to reduce fragmentation and preserve locality of reference as I've described.
	www.osronline.com /showThread.cfm?link=1595 (1689 words)

	No match for locality of reference (Site not responding. Last check: 2007-11-07)
		Sorry, the term locality of reference is not in the dictionary.
		Please send in a definition so I can add it to the dictionary.
		Nearby terms: localisation « localised « locality « local loop » local loopback addresses » Local Mail Transfer Protocol » Local Multipoint Distribution System
	ftp.sunet.se /foldoc/foldoc.cgi?locality+of+reference (67 words)

	[No title]
		Processor places each write request into the buffer and continues execution.
		If a subsequent Read request references data which is still in the write buffer, then this data is referenced in the write buffer.
		Write-back: Block is written back to the main memory when it is replaced.
	www.engr.uconn.edu /~ssg/cse243/lecture-14.ppt (671 words)

	Impact of rollback recovery to program locality of reference and page replacement policies
		We study the impact of checkpointing-based fault tolerance on the program locality of reference and memory page (or cache block) replacement policies.
		This model is corroborated using simulation, and we propose a new page/block replacement algorithm that takes into account fault-triggered rollback(s).
		Citation: Y. Lin, S. Bhattacharya, "Impact of rollback recovery to program locality of reference and page replacement policies," ftdcs, p.
	csdl.computer.org /comp/proceedings/ftdcs/1997/8153/00/81530104abs.htm (227 words)

	A Novice On Writing: Locality of Reference & Performance ?? (Site not responding. Last check: 2007-11-07)
		Was just surfing the net and came across this blog entry of Rico
		That was a good article to understand Locality of Reference and Performance...!!
		This is a paragraph of text that could go in the sidebar.
	mahalax.blogspot.com /2004/08/locality-of-reference-performance.html (64 words)

	Truly online paging with locality of reference
		We also extend the locality of reference concept captured by the access graph model to allow changes in the behavior of the underlying process.
		We can do so for almost all values of /spl Delta/ for which it is possible.
		Index Terms- paged storage; online paging; locality of reference; access graph model; memory; strongly competitive paging algorithm; access sequence; competitive deterministic algorithm; competitive randomized algorithm; page slots; virtual address space; virtual translation tables; probabilistic data structures; extended access graph
	csdl.computer.org /comp/proceedings/focs/1997/8197/00/81970326abs.htm (337 words)

	Health Data Standards and Systems in Victorian Hospitals - Department of Human Services Victoria Australia
		Postcode/Locality/SLA Reference File (Text File 872 KB) - Updated 15 June 2004
		Postcode/Locality/SLA Reference File (Text File 947KB) - Updated 04 March 2003
		Postcode/Locality/SLA Reference File (Self Extracting ZIP File 161KB)
	www.health.vic.gov.au /hdss/reffiles (339 words)

	Localities Arizona is the American way of Arizona Localities you can try it (Site not responding. Last check: 2007-11-07)
		Localities Arizona is the American way of Arizona Localities you can try it
		You are here: Home » Directory » Localities » Arizona
		Some of the localities listed in the following pages can be collected without permission.
	yambot.com /dir/Localities/Arizona.html (370 words)

	Links General Page 2
		Malacologia Reggina: by Vincenzo Rindone: "Contribution "on line" to the cognizance and to the study of the sea shells and of the marine malacofaunas from the coastal actual localities and from the fossiliferous sites, known and less known (also unknown), of the territory of the Reggio Calabria province (Southern Italy)"
		References to the Mollusc Fauna of the Red Sea
		We like to think about the "Vis" in the name as referring to "vision".
	www.manandmollusc.net /links_general1.html (2842 words)

	Optimizing Locality of Reference (ResearchIndex) (Site not responding. Last check: 2007-11-07)
		Abstract: This paper presents the principle ideas involved in hierarchical blocking, introduces the block packed storage scheme, and gives the implementation details and the performance rates of the hierarchically blocked Cholesky factorization.
		0.5: The Locality Property in Topological Irregular Graph..
		@misc{ algorithms-optimizing, author = "In Cholesky Algorithms", title = "Optimizing Locality of Reference", url = "citeseer.ist.psu.edu/700384.html" }
	citeseer.ist.psu.edu /700384.html (179 words)

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