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The optimal replacement policy, called OPT, is to evict the page which will be accessed farthest into the future. Since we can't predict the future precisely, we can't implement OPT in any real system. We can, however, run OPT on a saved trace of memory accesses, to measure how our real algorithm compares with OPT for a given trace.
Explain FIFO page replacement A FIFO replacement algorithm associates with every page the time when that page was brought into memory. When a page must be changed, the oldest p
We will brie?y introduce paging to ?nish off this lecture. When a process is loaded, not all of the pages are immediately loaded, since it's possible that they will not all be need
Compare between the one and two-dimensional memory organizations in terms of the memory structure, advantages, and disadvantages. Which approach would better support the needs o
Determine the syntax of the assembler directive EQU The following is syntax of the assembler directive EQU: EQU
What are the disadvantages of swapping technique used in pre-3BSD UNIX systems? If there is excessively much memory contention, processes are swapped out until sufficient
What is contiguous allocation? Allocation of a group of consecutive sectors for a one file.
1. Draw a schematic diagram of a CMOS inverter and explain its operation. 2. Draw schematic diagrams of CMOS NAND and NOR gates, and explain their operation. 3. Explain what
WHAT IS OPERATING SYSTEM ?ENLIST AND EXPLAIN BASIC SERVICES PROVIDE BY OS
What are the necessary conditions for deadlocks? 1. Mutual exclusion : Only one process at a time is able to use the resource. 2. Hold and wait : A process should be holdi
Cold Backup: It is copying the three groups of files when the object is shut down. This is a straight file copy, generally from the storage disk directly to tape. You must end th
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