Now, it's time to learn about the third type of multiple processor system, that is, the distributed system after learning about the first and second type of multiple processor systems, that is, multiprocessors and multicomputers in previous tutorials.
Distributed systems are something similar to multicomputers in that each node has their own private among with no any shared physical memory in system.
However, the distributed systems are even much more loosely coupled than the multicomputer systems.
In distributed system, each node is basically a complete computer with full complement of peripherals.
The nodes of distributed system may be spread around the world.
In distributed systems, the nodes may run different OSs each have its own file system and be under different administration.
The table given below compares multiprocessors, multicomputers and distributed systems:
|Node configuration||Central Processing Unit (CPU)||Central Processing Unit (CPU), Random Access Memory (RAM), net interface||Complete computer|
|Node peripherals||All shared||Shared exc. maybe disk||Full set per node|
|Internode communication||Shared Random Access Memory (RAM)||Dedicated interconnect||Traditional network|
|Location||Same rack||Same room||Worldwide|
|Operating systems (OSs)||One, shared||Multiple, same||All different|
|File systems||One, shared||One, shared||Each node has own|
|Administration||One organization||One organization||Many organizations|
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