QMCS 360 Class Notes # 12	Dr. Rick Smith Quantitative Methods and Computer Science
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Describe Next Quiz

Collect Homework

Bill Gates

Leading technical projects versus doing technical work

He's always been a man of vision, but lots of us have been suspicious of that vision

He got rich by pursuing a business model for making money on software for small computers

Intellectual property rights continue to pose a question with regards to computer software (Richard Stallman)

Being a leader or a good manager isn't the same as technical proficiency - both are essential to a successful project

Comment on new operating system work

New approach involving mathematical analysis and component based design

Sounds like classic "trusted computer systems" technology

Expensive, and some of the work isn't clearly necessary

It will be interesting to see what they really do

Hand back Quiz?

Memory Management Requirements

Relocation

Protection

Sharing

Logical Organization

Physical Organization

Physical vs Virtual Memory

Techniques

Fixed Partitioning

Dynamic Partitioning

Simple Paging

Simple Segmentation

Virtual Memory Paging

Virtual Memory Segmentation

VM Segmentation + Paging

Issues

External fragmentation (system utilization)

Internal fragmentation (process utilization of its memory)

Efficiency - computation, memory requirements

Complexity - efficiency concerns, concurrency issues

Memory Allocation

List based algorithms

First fit - order by location

Best fit - order by size

Next fit - order by use

Buddy system