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What is the difference between the interrupt and polling?

written 7.4 years ago by brianmeja01 • 0

modified 3.9 years ago by binitamayekar ★ 6.7k

discuss the parameters that distinguish between polling and interrupts..

computer organization and architecture

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written 3.9 years ago by binitamayekar ★ 6.7k

Difference Between Interrupt and Polling

Sr. No.	Parameters	Interrupt	Polling
1	Mechanism	Interrupt is considered a hardware mechanism.	Pilling is a type of protocol.
2	Procedure	Device notifies CPU that it needs CPU attention.	CPU constantly checks device status whether it needs CPU's attention.
3	Service Provider	Interrupt handler services the Device.	CPU services the device.
4	Definition	An interrupt is an event that is triggered by external components other than the CPU that alerts the CPU to perform a certain action.	Polling is an asynchronous activity that samples the status of an external device by a client program.
5	Occurrences	Interrupt can occur at any time.	Polling occurs at regular intervals.
6	Indication	The interrupt-request line indicates that a device needs service.	The command-ready bit indicates the device needs service.
7	CPU Cycles	CPU is disturbed only when a device needs servicing, which saves CPU cycles.	CPU has to wait and check whether a device needs servicing which wastes lots of CPU cycles.
8	Efficiency	Interrupt becomes inefficient when devices keep on interrupting the CPU repeatedly.	Polling becomes inefficient when the CPU rarely finds a device ready for service.
9	Benefits	Serves multiple devices, flexible, and efficient.	Simple program, transmission reliability, and no need for additional chips.
10	Drawbacks	More complex and time-consuming.	Standby time and CPU cycle waste.
11	Example	Let the bell ring then open the door to check who has come.	Constantly keep on opening the door to check whether anybody has come.

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