Video: Tus ntaus nqi cache xam li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A cache ntaus ratio yog xam los ntawm kev faib cov naj npawb ntawm cache hits los ntawm tag nrho cov naj npawb ntawm cache hits thiab nco, thiab nws ntsuas qhov ua tau zoo a cache yog ua raws li qhov kev thov rau cov ntsiab lus.
Ib yam li ntawd, tib neeg nug, cache hit ratio xam li cas?
Rau xam a ntaus ratio , faib tus naj npawb ntawm cache hits nrog tus lej ntawm tus lej ntawm cache hits , thiab tus naj npawb ntawm cache nco. Piv txwv li, yog tias koj muaj 51 cache hits thiab peb nco txog ib lub sijhawm, ces qhov ntawd txhais tau tias koj yuav faib 51 los ntawm 54. Qhov tshwm sim yuav yog ntaus ratio ua 0,944.
Tom qab ntawd, lo lus nug yog, dab tsi yog qhov hit ratio? Cov ntaus ratio yog ib feem ntawm accesses uas yog a ntaus . Tus nco piv yog ib feem ntawm accesses uas yog ib tug nco. Nws tuav tus nqi nco = 1− ntaus tus nqi. Cov ( ntaus /miss) latency (AKA access time) yog lub sij hawm nws yuav siv sij hawm mus nqa cov ntaub ntawv nyob rau hauv cov ntaub ntawv ntawm a ntaus / nco.
Hauv qhov no, cache hit rate yog dab tsi?
Cov ntaus nqi yog tus naj npawb ntawm cache hits muab faib los ntawm tag nrho cov naj npawb ntawm kev thov nco nyob rau ib lub sij hawm luv luv.
Dab tsi yog qhov sib piv ntawm cache yog tias lub kaw lus?
Cov cache ntaus ratio yuav tsum ua nrog tus naj npawb ntawm ntaus muab faib los ntawm tag nrho cov kev nkag. Yog txhua qhov kev nkag mus yog a ntaus ntawm cache , cov ntaus ratio yog 100%. Yog txhua yam kev nkag mus yog ib ntaus , tiam ntaus ratio yog 50%. Caches tuaj yeem sib cais raws li kev qhia vs cov ntaub ntawv caches.
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