This Question Covers Virtual Memory Access

question 21

Essay

This question covers virtual memory access. Assume a 5-bit virtual address and a memory system that uses 4 bytes per page. The physical memory has 16 bytes (four page frames). The page table used is a one-level scheme that can be found in memory at the PTBR location. Initially the table indicates that no virtual pages have been mapped. Implementing a LRU page replacement algorithm, show the contents of physical memory after the following virtual accesses: 10100, 01000, 00011, 01011, 01011,11111. Show the contents of memory and the page table information after each access successfully completes in figures that follow. Also indicate when a page fault occurs. Each page table entry (PTE) is 1 byte.

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Definitions:

Norms of Business

The accepted standards and practices that guide behavior in the business world.

Government Takeover

The acquisition of control over a company or sector by the government, potentially involving nationalization or requisition of private assets.

Per-Unit Costs

The expense incurred to produce, acquire, or sell one unit of a product or service, used in calculating profitability and pricing strategies.

Fixed Costs

Costs that do not vary with the volume of production or sales, such as rent, salaries, and insurance.