os5 - CISC 3595 Operating Systems Fall 2010 Assignment #5...

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CISC 3595 Operating Systems Fall 2010 Assignment #5 Out 11/22; back 12/9 Reread Chapter 8 and 9. Q1. Page 351, question 8.9. Answer: Internal Fragmentation is the area in a region or a page that is not used by the job occupying that region or page. This space is unavailable for use by the system until that job is finished and the page or region is released. External fragmentation is the area or region that is not used because it is free. Q2. Page 352, question 8.13 (a through c). Answer: Contiguous memory allocation scheme suffers from external fragmentation as address spaces are allocated contiguously and holes develop as old processes dies and new processes are initiated. It also does not allow processes to share code, since a process’s virtual memory segment is not broken into non-contiguous fine-grained segments. Pure segmentation also suffers from external fragmentation as a segment of a process is laid out contiguously in physical memory and fragmentation would occur as segments of dead processes are replaced by segments of new processes. Segmentation,
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os5 - CISC 3595 Operating Systems Fall 2010 Assignment #5...

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