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Wikipedia about cache

In computer science, a cache ( , like "cash"

A cache has proven to be extremely effective in many areas of computing because access patterns in typical computer applications have locality of reference. There are several kinds of locality, but this article primarily deals with data that are accessed close together in time (temporal locality). The data might or might not be located physically close to each other (spatial locality).

History

Use of the word cache in the computer context originated in 1967 during preparation of an article for publication in the IBM Systems Journal. The paper concerned an exciting memory improvement in Model 85, a latecomer in the IBM System/360 product line. The Journal editor, Lyle R. Johnson, pleaded for a more descriptive term than high-speed buffer. When none was forthcoming, he suggested cache, from the French cacher, meaning "to hide". The paper was published in early 1968, the authors were honored by IBM, their work was widely welcomed and subsequently improved upon, and cache soon became standard usage in computer literature.

Operation

A cache is a block of memory for temporary storage of data likely to be used again. The CPU and hard drive frequently use a cache, as do web browsers and web servers.

A cache is made up of a pool of entries. Each entry has a datum (a nugget of data) which is a copy of the datum in some backing store. Each entry also has a tag, which specifies the identity of the datum in the backing store of which the entry is a copy.

When the cache client (a CPU, web browser, operating system) wishes to access a datum presumably in the backing store, it first checks the cache. If an entry can be found with a tag matching that of the desired datum, the datum in the entry is used instead. This situation is known as a cache hit. So, for example, a web browser program might check its local cache on disk to see if it has a local copy of the contents of a web page at a particular URL. In this example, the URL is the tag, and the contents of the web page is the datum. The percentage of accesses that result in cache hits is known as the hit rate or hit ratio of the cache.

The alternative situation, when the cache is consulted and found not to contain a datum with the desired tag, is known as a cache miss. The previously uncached datum fetched from the backing store during miss handling is usually copied into the cache, ready for the next access.

During a cache miss, the CPU usually ejects some other entry in order to make room for the previously uncached datum. The heuristic used to select the entry to eject is known as the replacement policy. One popular replacement policy, least recently used (LRU), replaces the least recently used entry (see cache algorithms). More efficient caches compute use frequency against the size of the stored contents, as well as the latencies and throughputs for both the cache and the backing store. While this works well for larger amounts of data, long latencies, and slow throughputs, such as experienced with a hard drive and the Internet, it's not efficient to use this for cached main memory (RAM).Fact: date=May 2007

Search results for Cache

InterSystems Caché - World's fastest database

Caché Technology Partner Program. Ensemble Implementation. Partner Program. Support & Education ... Developers can innovate with Caché at no risk, because we ...www.intersystems.com/cache/index.html

CACHÉ

Official site Caché, a dramatic thriller about a talk show host whose secure life and marriage starts to crumble when voyeuristic videotapes begin turning up on his front porch. Starring Daniel Auteuil and Juliette Binoche. Directed by Michael Haneke.www.sonyclassics.com/cache/

InterSystems, makers of Caché, Ensemble, HealthShare, and TrakCare

A scalable, ... Caché Technology Partner Program. Ensemble Implementation. Partner Program ... Caché Support. Ensemble Support. HealthShare Support. TrakCare Support ...www.intersystems.com/

cache: Definition, Synonyms from Answers.com

cache n. A hiding place used especially for storing provisions. ... Britannica Concise Encyclopedia: cache ... Since a "stale" cache will contain data that ...www.answers.com/topic/cache

The Perl Cache homepage

Designed to assist a developer in persisting data for a specified period of time. ... Please refer to the Perl Cache project homepage hosted at SourceForge. ...perl-cache.sourceforge.net/

Images found for Cache

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News about Cache

First solo flight turns tragic - Grande Cache man killed in ultralight crash

Grande Prairie Daily Herald-TribuneVEGREVILLE — The first solo flight of an eager new pilot turned tragic when he lost control of his aircraft and crashed. ‘‘He told [...]http://www.dailyheraldtribune.com/ArticleDisplay.aspx?e=1229...

Fewer schools in Cache miss NCLB standard this year

The Logan Herald JournalTwo schools in the Cache County School District failed to meet federal No Child Left Behind (NCLB) progress requirements this year, an improvement over last year, when seven of the district’s schools failed.http://hjnews.townnews.com/articles/2008/10/01/news/news03.t...

Twin Liquors plans to lift the spirits of San Antonio

San Antonio Business JournalA family-owned chain hailing from the Capital City is bringing its cache of libations to the Alamo City.http://www.bizjournals.com/sanantonio/stories/2008/09/29/dai...

Undercover investigation leads to arrest of five for illegal guns

Queens ChronicleQueens District Attorney Richard Brown, front right, and Police Commissioner Raymond Kelly, front left, display a cache of illegal guns recovered during an investigation.http://www.zwire.com/site/news.cfm?newsid=20147785&BRD=2731&...

Fear, excitement or harassment?

The Logan Herald JournalWe all know Cache Valley has its share of gangs. Gangs ranging from “lH-Town” (a known Hyrum gang) and the gang “IF.L.” (A known gang in Logan/Smithfield), with many known gangs in between. Within these gangs there are many different races.http://hjnews.townnews.com/articles/2008/10/02/opinion/lette...

News about Cache

Fight injures students at Cache Creek High School

Woodland Daily DemocratOfficers from the Yolo County Probation Department attempt to assess what transpired at Cache Creek High School Thursday morning after a large fight broke out in front of the Yolo-based school. (Deo Ferrer/ Democrat) As many as five Cache Creek High ... http://www.dailydemocrat.com/ci_10437644?source=most_viewed

6-core Intel ‘Dunnington’ could be released next week

TG DailyThe six cores share 16 MB of L3 cache and each pair of cores will share 3 MB of L2 cache (9 MB total). Intel promises that chip will have a TDP rating of approximately 130 watts.http://www.tgdaily.com/content/view/39285/135/

Stalking the bugling bulls of Grizzly Island

San Francisco GateColusa County: Repair a water source for elk and other wildlife in Cache Creek Natural Area. Humboldt County: Improve forage for elk by thinning encroaching conifers from oak woodlands and native prairies in Lack's Creek Management Area.http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/09/11/...

RIM gets serious about pursuing consumers

San Francisco GateInstead of getting stuff streamed to you over a 3G connection, something that Pandora has done well on devices like the iPhone 3G, Slacker would do that but would also cache a whole load of songs from your different personalized radio stations so ... http://www.sfgate.com/cgi-bin/blogs/sfgate/detail?blogid=19&...

NHL 09 Disc Read Error Fix!

Xbox SolutionI got late word today that EA Sports have been receiving some reports of a disc read error when you try and load NHL 09 . Please do not take back to the retailer until you try this fix straight from EA. You need to clear the Cache of your Xbox 360 ... http://www.xboxsolution.com/2008/09/11/nhl-09-disc-read-erro...

Search results for Cache

Cache County, Utah

Official site for the county. Offers contact information for county offices and elected officials, news and calendar, employment information, and codes and ordinances. [Site still ... http://www.cachecounty.org/

Cache Collection - Home Furniture to the Trade Only

Cache offers a full line of hand crafted French, English,& Portuguese reproduction furniture from the 17th , 18th, & 19th century . We also offer selected antiques from these ... http://www.cachecollection.com/

Conroe Area Christian Home Educators (CACHE) - Home school support ...

The Conroe Area Christian Home Educators (CACHE) is a 300+ member home school support group located in Montgomery County, Texas.http://www.cacheonline.org/

CACHE: Leading Qualifications for working in Children's Services

Council for Awards in Childrens Education. Working with children and young people is one of the most rewarding jobs imaginable. Our qualifications can open the door to a wide ... http://www.cache.org.uk/

Cache, Oklahoma The Town

Cacheok.com tries to provide as much information on Cache and the local area as possable. Please let us know what we can do to make the site more usful. webmaster@cacheok.comhttp://cacheok.com/
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Videos found for Cache

Cache

CacheA talk show host and his wife are terrorized by videotapes revealing their most intimate moments.Flash - Video

Clinton's Cash Cache

Clinton's Cash CacheDiscussing Bill and Hillary's income, with Jared Bernstein, Economic Policy Institute; Ann Coulter, syndicated columnist; and CNBC's Larry Kudlow.Windows Media - Video

The Who: Cache Cache

The Who: Cache CacheFrom the album Face DancesVideo - Video

Broker Action: Cache

Broker Action: CachePlus analyst action on Salix Pharmaceuticals and SJW.Flash - Video

Athlon Xp 2600 Retail 512 Cache 333...

Athlon Xp 2600 Retail 512 Cache 333mhzAthlon Xp 2600 Retail 512 Cache 333mhz, Computer Accessories, Computers & AccessoriesFlash - Video

Videos found for Cache

allegro-cache-1.AVI

allegro-cache-1.AVIParent Directory - allegro-cache-1.AVI 28-Apr-2005 23:24 339M allegro-cache-2.AVI 28-Apr-2005 23:36 148Mavi: 338.6 MB w:320px - h:240px

allegro-cache-2.AVI

allegro-cache-2.AVIParent Directory 04-May-2005 08:01 - allegro-cache-1.AVI 28-Apr-2005 22:24 339M allegro-cache-2.AVI 28-Apr-2005 22:36 148M allegro-cache-3.AVI 28-Apr-2005 22:57 272Mavi: 147.6 MB w:320px - h:240px

FirefoxCache.wmv

FirefoxCache.wmvClearing the Cache In Netscape ver. 7.x Browsers Clearing the Cache In Firefox ver. 1.x Browsers 'Blank' .pdf Content and Fast Web View - Adobe Acrobat 5msmedia: 0.5 MB w:596px - h:669px

Cache_Trlr_300.mov

Cache_Trlr_300.movCache Quicktime movie trailer Lo-Res Cache Quicktime movie trailer Hi-Res The Calcium Kid Movie Trailerquicktime: 4.8 MB w:320px - h:240px

Cache (2005) - Theatrical Trailer

Cache (2005) -  Theatrical Trailer Cache (2005) - Theatrical Trailer msmedia: 10.9 MB w:400px - h:300px

Answers for Cache

Keep Smiling :o)

How to increase cache size for storage of temporary internet files of internet explorer 7 from 1 GB to above ?

Keep Smiling :o)1. Go to Internet Options 2. Click on the General Tab 3. Click "Settings" in Temporary internet Files Box 4. Here you can increase or decrease the storage capacity.
integralegr

How to enable the L3 cache of my Phenom 9750 in Vista 64 SP1?

integralegrAre you sure? Do this first : Download CPU-Z and check if the program detects the correct amount on L3 cache. If it is. Then it is working correctly. http://www.cpuid.com/cpuz.php However,...
mogslynn

How to access google mail after acct has been closed but cache is still full.?

mogslynn
godblespicnie

How do you clear the cache for any search engine, or whatever?

godblespicnieTo clear your cache, just follow the browser-specific steps below. Microsoft Internet Explorer (IE) 1. Log out of your Google account. Close all other open browser windows. 2. Click the "Tools"...
John S.

Why does my Internet Explorer cache fill up even though I use a different browser?

John S.Looks like your other browsers are sharing the same temp folder as Internet Explorer. You can change that in the preferences of each browser if you want, or just keep them all in one central location ...

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