Pertemuan 13 Operating System 1

1
Pertemuan 13Operating System 1

• Matakuliah H0344/Organisasi dan Arsitektur
  Komputer
• Tahun 2005
• Versi 1/1

2
Learning Outcomes

• Pada akhir pertemuan ini, diharapkan mahasiswa
• akan mampu
• Menghubungkan prinsip-prinsip scheduling proses
  komputasi

3
Outline Materi

• Overview
• Scheduling

4
Overview
An operating system is a program that controls
the execution of application programs and acts as
an interface between the user of a computer and
the computer hardware. It can be thought of as
having two objectives

• Convenience
• Efficiency

5
Overview
Layers and views of computer system
6
Overview
The operating system typically provides services
in the following areas

• Program creation
• Program execution
• Access to I/O devices
• Control access to files
• System access
• Error detection and response
• Accounting

7
Overview
The operating system as resource manager
8
Overview
Memory layout for a resident monitor
9
Overview
Multiprogrammingbatch systems
10
Overview
Batch multiprogramming versus time sharing
Batch multiprogramming Time sharing
Principal objective Maximize processor use Minimize response time
Source of directives to operating system Job control language commands provided with the job Command entered at the terminal
11
Scheduling
Type of scheduling
Long term scheduling The decision to add to the pool of processes to be executed
Medium term scheduling The decision to add to the number of processes that are partially or fully in main memory
Short term scheduling The decision as to which available process will be executes by the processor
I/O scheduling The decision as to which processs pending I/O request shall be handled by an available I/O device
12
Scheduling
Five state process model
13
Scheduling
Process control block
14
Scheduling
Example
15
Scheduling
Key elements of an operating system for
multiprogramming
16
Scheduling
Queuing diagram representation of processor
scheduling