6.chap6 real memory

Chöông 6 BOÄ NHÔÙ THÖÏC

CHÖÔNG 6 : BOÄ NHÔÙ THÖÏC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

PHAÂN CAÁP BOÄ NHÔÙ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CACHE PRIMARY STORAGE SECONDARY STORAGE

CHIEÁN LÖÔÏC QUAÛN LYÙ BOÄ NHÔÙ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TOÅ CHÖÙC BOÄ NHÔÙ THÖÏC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

HEÄ THOÁNG PHAÂN PHOÁI LIEÂN TUÏC MOÄT NGÖÔØI DUØNG (Single User Continuous Storage Allocation) ,[object Object],[object Object],[object Object],[object Object],OS USER UNUSED CPU Boundary register

KYÕ THUAÄT OVERLAY ,[object Object],OS FIXED AREA OVERLAY AREA UNUSED PROGRAM

[object Object],HEÄ THOÁNG ÑA CHÖÔNG PHAÂN ÑOAÏN COÁ ÑÒNH (Fixed Partitioning Multiprogramming) ,[object Object],[object Object],[object Object],Process queue P0 P2 P1 OS 1 2 3 P0 P2 P1 P5 P7 P6 Process queue OS 1 2 3

HEÄ THOÁNG ÑA CHÖÔNG PHAÂN ÑOAÏN COÁ ÑÒNH ,[object Object],[object Object],OS 1 2 3 Low boundary High boundary CPU

HEÄ THOÁNG ÑA CHÖÔNG PHAÂN ÑOAÏN THAY ÑOÅI (Variable Partitioning Multiprogramming) OS User A 15KB User B 25KB User C 40KB P0 P2 P1

HEÄ THOÁNG ÑA CHÖÔNG PHAÂN ÑOAÏN THAY ÑOÅI ,[object Object],[object Object],OS Free space 20KB Free space 35KB Free space 15KB Free space 10KB 12KB ? Best fit First fit Worst fit

HEÄ THOÁNG ÑA CHÖÔNG COÙ THAY THEÁ VUØNG NHÔÙ (Multiprogramming With Storage Swapping) OS SWAPPING AREA Programs on Secondary storage swap in swap out

6.chap6 real memory

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6.chap6 real memory