Qhov nruab nrab ntawm tus neeg siv computer yog yuav luag paub nrog lub tswv yim xws li kev nkag mus siv ntawm lub cim xeeb, tus tsim, thiab kev nyeem nkaus xwb lub cim xeeb. Tab sis tam sim no, yog li ntawd nyob rau peb lub sijhawm, cov lus nrov hauv cache yog puzzling rau ntau.
Lo lus cache tau tshwm sim hauv cov lus siv computer hauv xyoo 1967. Lub heyday ntawm lub thev naus laus zis thev naus laus zis, thiab, yog li ntawd, qhov kev tsim khoom sai sai. Los ntawm lub sijhawm no, khoos phis tawj microprocessors pib ua haujlwm ntau zaus sai dua li lub cim xeeb nkag. Hauv no hais txog, cov processors sawv dawb rau lub sijhawm ntau, tos rau cov ntaub ntawv siv tswv yim hauv RAM kom tau ua. Tag nrho cov no cuam tshuam ntau qhov kev tsim kho tshiab ntawm khoos phis tawj, thiab nws yog qhov tsim nyog los nrog txoj hauv kev daws qhov teeb meem no. Ib qho kev daws teeb meem tau pom - lub cim xeeb ntawm lub cim xeeb siab. Lub ntsiab lus no tau siv los piav qhia lub cim xeeb me me nrog lub siab nkag mus ceev, uas daws cov teeb meem ntawm processor downtime. Nws tau pom zoo kom hu qhov kev nco no lub cache, nyiaj ntsuab - los ntawm lus Askiv "nyiaj ntsuab". Lub npe tau muab rau vim li cas, nws cov kws sau sib piv lub cim xeeb hauv computer rau nyiaj. Yog li cov cim xeeb ruaj khov tau muab piv rau cov nyiaj tso hauv tsev txhab nyiaj, uas tsuas yog siv tom qab nws mus xyuas, nqa cov txheej txheem rau debiting cov nyiaj, thiab tsuas yog tom qab ntawd cov nyiaj no tuaj yeem siv kev lag luam nco qab yog cov nyiaj uas khaws cia hauv tsev. Tus nqi tsawg dua li ntawm qhov tso nyiaj, tab sis muaj rau siv nyob rau hauv ib lub sijhawm luv dua ntawm lub sijhawm (koj tsuas yog xav tau los tsev thiab coj nws). Thiab thaum kawg, nyiaj ntsuab (tib qho nyiaj), uas yog tus nqi me dua, tab sis ib txwm nrog koj, hauv koj lub hnab tshos lossis hnab nyiaj, thiab koj siv tau txhua lub sijhawm. Nws yog los ntawm tej yam uas niaj hnub hais tias lub sij hawm cache tau tshwm sim. Qhov sib txawv ntawm qhov ceev ntawm cov txheej txheem niaj hnub thiab RAM tseem tseem ceeb, thiab nws tsis zoo li tias lawv yuav puas sib npaug, yog li cov cache tseem siv nyob rau niaj hnub no. CPU cache feem ntau muab faib ua ob theem (L1, L2. L-Qib, los ntawm Lus Askiv - "qib"). Thawj qib yog qhov me me ntawm qhov loj me, tab sis kev ceev tshaj plaws ntawm cov ntaub ntawv ntawm cov ntawv ceev, qhov thib ob, feem, qhov loj dua hauv ntim, tab sis qeeb qeeb. Nws yuav tsum raug sau tseg tias tam sim no nws muaj peev xwm nrhiav cov txheej txheem nrog peb theem theem. Cov qauv ntawm cov qib tsis hloov ntawm qhov no (qib siab dua, ntau dua qhov ntim thiab qhov nrawm qis dua), lub npov tau siv tsis yog hauv microprocessors. Nws kuj yog siv nyob rau hauv kev ua haujlwm ntawm sab nraud drives (hard drive, cd thiab dvd disks). Cov ntaub ntawv uas tam sim no tseem tab tom ua, sau ntawv los yog nyeem ntawv raug muab khaws cia rau hauv qhov chaw khaws ntaub ntawv. Yuav luag txhua cov browsers thiab ntau lwm yam kev siv siv lub npov.
