Operating System as Resource Manager

WHAT IS OPERATING SYSTEM ?

•Operating System is a software, which makes a computer to actually work.

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•It is the software that enables all the programs we use.

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•The OS organizes and controls the hardware.

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•OS acts as an interface between the application programs and the machine hardware.

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•Examples: Windows, Linux, Unix and Mac OS, etc.

Why Resource Manager ?

*When a computer has multiple users, the need for managing and protecting the memory, I/O devices and other devices is even greater.

*The primary task of OS is to keep track of who is using which resource, to grant resource requests, to mediate conflicting requests from different programs etc.

*Users often need to share not only hardware, but information(File, Database) as well.

Which Includes in Resource Manager ?

Resource management includes multiplexing resources in 2 ways, they are

1. In Time

2. In Space

When Resource is Time Multiplexed

*“Who goes next and for how long”- is the main task for time resource manager in OS.

*Different programs or user take turns using it.

*Multiple programs will run by allocating the CPU through OS.

*When another program gets to use the CPU, the OS will choose.

*Sharing the printer is the ideal example for time multiplexing .

When Resource is Space Multiplexed

*Main memory is normally divided up among several running programs

*OS assume enough memory to hold multiple programs

*OS hold several programs in memory at once instead of completing one by one.

*The issues of fairness, protection and so on will solve by OS.

*Hard disk is another resource manager for space multiplexed.