Course Information

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What is the Operating System

Hardware & Software: a Big Picture

Definition

• A. Silberschatz: “A program that acts as an intermediary between a user of a computer and the computer hardware.”
• Dietel: “Programs that make the hardware usable.”

Why learn OS?

• To make a new hardware up and running.
• To add, modify, and enhance a functionality
• To fine-tune the performance

Operating Systems Goals

• Efficient Use of Resources
  • Avoid bottlenecks that affect performance
  • Keep all components as busy as possible
• Convenience and Productivity for Users
  • The user costs more than the machine
  • Deliver function as efficiently as possible
• Availability and Reliability
  • Computer systems are critical
  • A failed system can mean a failed company

Operating Systems: Abstract View

Operating Systems: Detailed View