38.Networking by John G. Webster (Editor)

By John G. Webster (Editor)

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However, if multicast or even broadcast is not provided, group communication could be supported by one-to-one communication at the network level. Communication groups are dynamic. This means that new groups can be created and some groups can be destroyed. A process can be a member of more than one group at the same time. It can leave a group or join another one. In summary, group communication shares many design features with message passing and RPC. However, there are some issues which are very specific, and their knowledge could be of a great value to the application programmer.

As a result, messages are used only for synchronization and to transfer small amounts of data, such as pointers to shared memory. The main advantage of passing data by-reference is that it is cheap—large messages need not be copied more than once. The disadvantages of this method are that the programming task becomes more difficult, and it requires a combination of virtual memory management and interprocess communication, in the form of distributed shared memory. Marshalling Parameters and Results.

This paves the way of achieving high productivity and high performance in distributed computing. The client-server model is becoming the predominant form of software application design and operation. However, to fully benefit from the client–server model, there is a need to employ an operating system and communication network which links computers on which these processes run. Furthermore, in order to locate a server, the operating system must be involved. The question is what class of an operating system can be used.

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