INTRODUCTION TO OPERATING SYSTEMS

Name 5 types of operating systems

1) Batch 2) Interactive 3) Real-time 4) Hybrid 5) Embedded

What are the 5 SUBSYSTEM MANAGERS of an operating system?

1) Memory Manager 2) Processor Manager 3) Device Manager 4) File Manager 5) Network Manager

For the 5 subsystem managers give examples of the resources the work with.

1) Memory Manager - main memory 2) Processor Manager - CPU 3) Device Manager - keyboard, printer, disk drives, modem, monitors 4) File Manager - program files, data files, compilers 5) Network Manager- network communication protocols

Name the 5 categories of computers

1) Microcomputers · Single user status · Very little memory (64Kb) 2) Minicomputers · Developed for smaller institutions · Midrange computers 3) Supercomputer · Massive computers · Used for military operations, weather forecasting, scientific research 4) Workstations · Multiple powerful microcomputers · Used for commercial, educational and government enterprises. 5) Servers · Provided specialized services to other computers and other servers · Print servers, internet servers and mail servers contains the resources that other computers and servers make request for.

What is the block diagram of a computer system?

Input - Processing - Output

What is an operating system?

It is part of computer software system that manages all hardware and software. It controls every file, device, section of main memory and nanosecond of processing time. It controls who can use the system and how it is used.

Give 4 responsibilities of Device manager

Responsibilities include 1) Choosing most efficient resource allocation method such as Printers, ports, disk drives, etc. Based on scheduling policy 2) Allocating the device 3) Starting device operation 4) Deallocating the device

Give 2 responsibilities of Process manager

Responsibilities include 1) Handle jobs as they enter the system by the Job Scheduler. 2) Manage each process within those jobs Process Scheduler.

Give 4 responsibilities of Memory manager

Responsibilities include 1) Preserving space in main memory occupied by operating system. 2) Checking validity and legality of memory space request. 3) Setting up memory tracking table to track usage of memory by sections. This is needed in multiuser environment. 4) Deallocating memory to reclaim it.

Give 3 responsibilities of File manager

Responsibilities include: 1) Enforcing user/program resource access restrictions (Uses predetermined access policies) 2) Controlling user/program modification restrictions (Read-only, read-write, create, delete) 3) Allocating resource (Opening the file and Deallocating file)

What is Moore's Law

States that the power of computers rises exponentially, "CPU power doubles every 18 months."

What are the task of the subsystems?

The task of subsystem managers is to: 1) Monitor its resources continuously 2) Enforce policies determining who gets what, when, and how much. 3) Allocate and deallocate the resources when appropriate.

What are the 2 distinguishing features of the 5 operating systems

Two distinguishing features are: · Response time · How data enters into the system