Video: Puas yog lub cim xeeb mapped cov ntaub ntawv sai dua?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Nkag mus nco mapped files yog sai dua dua li siv ncaj qha nyeem thiab sau ua haujlwm rau ob qho laj thawj. Ua ntej, kev hu xov tooj yog qhov kev txiav txim siab qeeb dua li qhov hloov pauv yooj yim rau qhov kev zov me nyuam hauv zos nco.
Yog li ntawd, nco mapped cov ntaub ntawv yog dab tsi thiab yuav siv li cas?
A nco - daim ntawv qhia muaj cov ntsiab lus ntawm a ntaub ntawv hauv virtual nco . Qhov no daim ntawv qhia nruab nrab a ntaub ntawv thiab nco qhov chaw enables ib daim ntawv thov, nrog rau ntau yam txheej txheem, hloov cov ntaub ntawv los ntawm kev nyeem ntawv thiab sau ncaj qha rau lub nco.
Ib yam li ntawd, MMAP puas nrawm dua nyeem? Tseem, mmap zoo li ua tau zoo heev rau kev ua ntu zus nyeem ntawm 4 KB ib zaug rau 1 GB cov ntaub ntawv. Kuv nyeem online uas muaj "ntau ntxiv ntawm kev luam tawm" nrog kev siv nyeem (): uas yog disk -> kernel chaw -> neeg siv tsis, piv rau disk -> mapped cheeb tsam rau mmap ().
Tib neeg kuj nug, koj txhais li cas los ntawm daim ntawv teev lus rau hauv nco?
Mapping cov ntaub ntawv rau hauv Memory . Daim ntawv qhia yog tus txheej txheem ntawm daim ntawv qhia disk sectors ntawm a ua ntaub ntawv rau hauv lub virtual nco qhov chaw ntawm tus txheej txheem. Raws li koj nyeem cov ntaub ntawv los ntawm daim ntawv qhia pointer, cov nplooj ntawv hauv cov ntaub ntawv tsim nyog thiab xa rov qab rau koj lub app.
Cov ntaub ntawv MMAP yog dab tsi?
MindManager maps yog siv rau ntau lub hom phiaj, xws li kev npaj cov hom phiaj kev lag luam, taug qab qhov kev nce qib ntawm cov haujlwm, sau cov ntawv sib tham, thiab tso tawm cov haujlwm ua lag luam. Qhib tshaj 100 ntaub ntawv hom ntawv nrog Cov ntaub ntawv Viewer rau Android.
Pom zoo:
Lub cim xeeb tseem ceeb thiab lub cim xeeb thib ob yog dab tsi muab piv txwv?
Lub cim xeeb thib ob muaj nyob rau hauv ntau thiab ib txwm loj dua lub cim xeeb thawj. Lub khoos phis tawj tuaj yeem ua haujlwm yam tsis muaj lub cim xeeb thib ob raws li nws lub cim xeeb sab nraud. Cov piv txwv ntawm lub cim xeeb thib ob yog lub hard disk, floppy disk, CD, DVD, thiab lwm yam
Dab tsi yog cov txheej txheem kom tau txais cov ntaub ntawv tawm ntawm lub cim xeeb cia hu ua?
Rov qab. Cov txheej txheem kom tau txais cov ntaub ntawv tawm ntawm lub cim xeeb cia. Rov qab. Kom tau txais cov ntaub ntawv tawm ntawm lub cim xeeb cia. Retroactive cuam tshuam
Lub cim xeeb mapped file hauv OS yog dab tsi?
Lub cim xeeb mapped cov ntaub ntawv yog ib tug feature rau tag nrho cov niaj hnub operating system. Nws xav tau kev sib koom tes ntawm tus thawj tswj nco thiab I / O subsystem. Yeej, koj tuaj yeem qhia rau OS tias qee cov ntaub ntawv yog lub khw rov qab rau qee feem ntawm cov txheej txheem nco. Yuav kom nkag siab qhov ntawd, peb yuav tsum nkag siab txog lub cim xeeb virtual
Dab tsi yog daim teb uas muaj cov ntaub ntawv tshwj xeeb rau cov ntaub ntawv?
Kev teeb tsa thawj tus yuam sij Tus yuam sij tseem ceeb yog daim teb uas muaj cov ntaub ntawv tshwj xeeb rau txhua cov ntaub ntawv
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously