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OS Distributed Systems



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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.

Comparison of three types of Multiple CPU Systems

The table given below compares multiprocessors, multicomputers and distributed systems:

Item Multiprocessor Multicomputer Distributed System
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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