Yintoni na efihlakeleyo memory

Asingabo bonke abanini computer siyazi ukuba cache enjalo, nangona ngenkuthalo lusetyenziswa ngokupheleleyo bonke abenzi, zombini iziqhubekisi kunye neenkqubo. kutshanje kuphela Abanye abasebenzisi baye baqala ukuphuhlisa ikhompyutha yobuqu, maxa wambi kwi namaqonga eengxoxo kwi Global Network akhalaze yokusebenza olucothayo lwabancedisi babo elektroniki. Umzekelo, ukuba kudlula imizuzwana 5 phakathi kokuqalisa yeenkqubo ze ofisi abachazayo kwaye ukuvela iifestile ezininzi, ngoko kucingwa ukuba ixesha kakhulu. Okanye ithi imizuzwana 10-15 ayafuneka ivuleke zokusebenza kwi-hard disk ukuya elinazibini izitya ngemagnethi - yinkcitha xesha. Okumangalisayo: Iminyaka kuphela elinesibini eyadlulayo, ukusungulwa kwenkqubo kungathatha phantse isiqingatha ngomzuzu, kwaye kungafanelekile ingqalelo ngokukhawuleza. Enye into icacile - ekwandeni komsebenzi computer kakhulu kwaye oku indima lokugqibela eyadlalwa efihlakeleyo iprosesa.

Njengoko kusetyenziswa kwinkumbulo iimodyuli kwimpahla yentsimbi ye computer ngokusekelwe kwi-technology DRAM (imemori olutshintshatshintshayo yofikelelo oluzenzekelayo). Iimpawu zale nobugcisa ngendleko ephantsi, ukuthembeka aphezulu ... kwisantya iphantsi kakhulu. DRAM kusetyenziswa kwiminyaka elishumi eyadlulayo, nangona kancinci nokulungalungiswa yayo. Ukuba ngexesha lofikelelo memory iiseli isalityaziswa nanoseconds malunga 200, ngoko ke eli xabiso oluleyisayo ukungakwazi ekhayen-20. Kubonakala - isantya kufuneka nje kumnandi! Noko ke, ngaxeshanye kunye ekuphuculeni DRAM sagxininisa umthamo kumqhubekekisi ibhasi, ngoko umlinganiselo liphelele itshintshe akunjalo njengoko kungenzeka. Apha siza umbuzo wokuba yintoni cache. njani Ndiya kuyandisa kwintsebenzo esezantsi Computer Memory? Impendulo izicacele - yinto enokwenzeka endaweni lixesha DRAM into progressive ngakumbi. Kodwa edume Intel amava kunye imivalo eninzi Rambus wacebisa ukuba ukutshintshwa akufuneki kakhulu Ukwandisa iindleko zizonke.

Ngaphandle salo mthetho, akukho mntu zange bacinga ukuba cache onjalo, ngokuba kwindlela kuba ingongoma elaliza. Kumanele ukubuyisela phambili ngakumbi DRAM SRAM (ufikelelo static imemori oluzenzekelayo) kwaye ngxaki ingasombululwa. Kodwa oku kubandakanya ukwanda okubonakalayo kweendleko. Ngoko ke ecetywayo a version ukuhlehla yimpumelelo kangangokuba isebenza ukususela ngexesha memory iibhloko zesantya-80286 yokuqala zicwangciswe ukwandisa ukusebenza kwenkqubo phakathi iimodyuli memory olucothayo kakhulu yaye-high speed kumqhubekekisi. Relative ukuba iiseli DRAM na isixa engabalulekanga kakhulu, ukusuka 8 kbps (inqanaba L1) ukuya ku amashumi megabytes (inqanaba L3). isilawuli Special udlula bi-owenza umsinga data kunye iikopi zazo ngendlela kwimemori ukuzila. Ngesicelo olulandelayo CPU ukuhlola DRAM isilawuli ukuba akukho "ekhohlo" KWEDATHA ekunene, kwaye xa zifumaneka, kumqhubekekisi ukudluliselwa nje cache. Njengoko sibonile, isimiso ukusebenza ilula. kwi iindlela ukuphunyezwa kuvela iingxaki: ababhekisi kufuneka isigqibo uhlobo lwe data nto duplicate, ukuvuselela ngayo, indlela yokuphucula umsebenzi ukusebenza, njalo njalo ke le topic enkulu kakhulu, ukuba njalo kakhulu kuyo afumaneka kwimithombo ezizodwa ..

Ngoko ke, impendulo yombuzo oko yememori efihlakeleyo, nokuba kwenziwa ngolu hlobo lulandelayo: i-cache njengesikhuseli apho umlawuli ubhala / afunde data, ukwandisa ukusebenza esezantsi memory.

Kwaye ngokuphathelele kwisicelo womnatha oko efihlakeleyo? Isikhangeli yomsebenzisi xa ujonga amaxwebhu kwi Internet usebenzisa isisombululo esifanayo. Xa kuvulwa yokuqala naziphi na izinto zayo, amaphepha amaninzi (data umfanekiso) ezigcinwe kwifowulda phezu disc, nangenxa elandelayo eya le datha kuphela eboniseweyo kwi web kade, kwaye ifakwe kwi fowulda, ukwandisa isantya bejonga. Kukunyusa isantya obonakala ngokukodwa ngesantya ezisezantsi ze Internet.