21. Page Frame Allocation and Thrashing
The chapter focuses on paging, specifically discussing frame allocation strategies and the problems associated with thrashing. It elaborates on different allocation schemes such as fixed and proportional allocation, and how priority-based allocation can impact performance. Additionally, it introduces the concept of thrashing, its causes, and the working set model to manage memory effectively.
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What we have learnt
- The importance of frame allocation strategies in optimizing process performance.
- The distinction between fixed allocation, proportional allocation, and priority-based allocation schemes.
- The definition and implications of thrashing in a system when processes do not have enough frames for their active pages.
Key Concepts
- -- Frame Allocation
- The process of distributing memory frames to processes in order to manage memory efficiently.
- -- Thrashing
- A situation where the system spends more time swapping pages in and out of memory than executing instructions, leading to decreased CPU utilization.
- -- Working Set Model
- A model that defines the number of distinct pages a process needs in memory based on recent page references, to minimize page faults.
- -- PriorityBased Allocation
- An allocation method that assigns frames to processes based on their priority, allowing higher priority processes to have more frames.
Additional Learning Materials
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