'Lfu algorithm replaces page' presentation slideshows

Chapter 9: Virtual Memory

Chapter 9: Virtual Memory. Chapter 9: Virtual Memory. Background Demand Paging Copy-on-Write Page Replacement Allocation of Frames Thrashing Memory-Mapped Files Allocating Kernel Memory Other Considerations Operating-System Examples. Objectives.

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Virtual Memory, File-System Interface

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Chapter 10: Virtual Memory

Chapter 10: Virtual Memory. Chapter 10: Virtual Memory. Background Demand Paging Page Replacement Allocation of Frames Thrashing. Objectives. To describe the benefits of a virtual memory system

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Chapter 9: Virtual Memory

Chapter 9: Virtual Memory. Objectives. To describe the benefits of a virtual memory system To explain the concepts of demand paging, page-replacement algorithms, and allocation of page frames To discuss the principle of the working-set model. Chapter 9: Virtual Memory. Background

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Chapter 10: Virtual Memory

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Page Replacement Algorithms (Virtual Memory)

Page Replacement Algorithms (Virtual Memory). Servicing a Page Fault. operating system. 3. running process. 2. page table. 1. i. physical memory. 6. free frame. 5. 4. disk. No free frame: now what?.

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Background

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Allocation of Frames & Thrashing (Virtual Memory)

Allocation of Frames & Thrashing (Virtual Memory). LRU Algorithm. Reference string: 1, 2, 3, 4, 1, 2, 5, 1, 2, 3, 4, 5 Counter implementation: Every page entry has a counter; every time page is referenced through this entry, copy the clock into the counter.

1.14k views • 23 slides

Page Replacement Algorithms

Page Replacement Algorithms. Want lowest page-fault rate Evaluate algorithm by running it on a particular string of memory references (reference string) and computing the number of page faults on that string In all our examples, the reference string is 1, 2, 3, 4, 1, 2, 5, 1, 2, 3, 4, 5.

457 views • 23 slides

Allocation of Frames & Thrashing (Virtual Memory)

Allocation of Frames & Thrashing (Virtual Memory). LRU Algorithm. Reference string: 1, 2, 3, 4, 1, 2, 5, 1, 2, 3, 4, 5 Counter implementation: Every page entry has a counter; every time page is referenced through this entry, copy the clock into the counter.

265 views • 23 slides