Distributed System ServicesPrepared By:-
firstname.lastname@example.org OverviewWhat is operating system?
Layers of O.S.
Basic Services provided by O.S.
Services by System Servers.
Value Added Services.
What is an operating system? (ch-10,OS,Nell dale, john lewis)An operating system
Is a service provider.
Manages computer resources, such as memory and input/output devices.
Provides an interface through which a human can interact with the computer.
ContinuedAllows an application program to interact with other system resources.
Layers of Computer systems (ch-2,2.1,OS Overview) Basic Services Provided By O.S (Ch-3,3.12,OS structure, Silberschatz ,Galvin,Gange)Program development
Editors and debuggers.
Access to I/O devices.
Controlled access to files
Continued (Ch-3,3.12,OS structure, Silberschatz ,Galvin,Gange)Error detection and response
Internal and external hardware errors
Continued (Ch-3,3.12,OS structure, Silberschatz ,Galvin,Gange)Accounting
Collect usage statistics.
Used to anticipate future enhancements.
Used for billing purposes.
Fundamental Services (ch-2,2.3,Distributed OS& Algorithms,Randy chow,Theodore johnson.)Three fundamental services are there .
Services By system servers.
Value Added Services. What is kernel? (ch-2,2.1,OS Overview)Portion of operating system that is
always in main memory
Contains most-frequently used functions
Also called the nucleus
Good performance of the kernel is very