Computer Science · Operating Systems & Memory Management
In the context of frame allocation and memory management strategies, which of the following statements correctly differentiates between Global and Local replacement policies?
- 1Local replacement is the more common strategy in practical modern operating systems because it allows the CPU to utilize the entire pool of physical memory frames more efficiently than global replacement.
- 2Global replacement is characterized by high process isolation, which ensures that the paging behavior and page fault rate of one process do not impact the performance or frame availability of other processes.
- 3Local replacement increases overall system flexibility by allowing the operating system to dynamically reallocate frames from any active process to satisfy the page fault of the current process.
- 4Global replacement allows a process to select a victim frame from the entire set of frames in the system, providing high flexibility but risking system-wide thrashing, while local replacement restricts a process to evicting only its own allocated frames to ensure process isolation.✓
Correct answer
Global replacement allows a process to select a victim frame from the entire set of frames in the system, providing high flexibility but risking system-wide thrashing, while local replacement restricts a process to evicting only its own allocated frames to ensure process isolation.
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