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COMP 3430 – Operating Systems
Segmentation part 1

April 4th, 2022

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By the end of today’s lecture, you should be able to:
▶ Describe the concept of segmentation. ▶ (Continuing) Compare and contrast
methods for address translation.
The Woggle-Bug Book (Public Domain)

Lab 4 and assignment 4
Let’s take a look.

Segmentation
▶ Allocating full address spaces ▶ Internal fragmentation.
▶ Logically separate address spaces into segments.
▶ Allocate only as much of the segment as is necessary.
▶ Let’s draw some pictures .

▶ Base+bounds is OK, but limits number of processes. ▶ Unused but allocated space → Internal fragmentation.
▶ Segmentation is better than primitive base+bounds. ▶ Has its own limitations.

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