Multi-processor

Multi-processing:

Multi-processing is the use of two or more Central processing units (C.P.U) with a single computer system.

Classification and Types:

Multiprocessing can be classified according to processor symmetric, the number of instructions and data streams, types of coupling. 

The types are-

i) Processor Symmetric

ii) Instruction and Data streams

iii) Processor Coupling

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Advantages:

i) Increase Thoughput  //per unit time how many process run or complete

ii)Increased Reliability  //if one processer is damage but your task  not stop beacuse other process run  the task.

iii)Cost Saving           // buy 4 computer or buy 4 cpu for 1 computer is most cost effective

iv) Battery Efficient   

iv) True parallal Processing  //in same time we run differct process

Disadvantages:

i)  More Comlex

ii)Overhead or Coupling reduce thoughtput

iii)Large main memory

Operating System Function and Requirement:

The functions and the requirement of the OS are-

i) Multi-Processor Scheduling:

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