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Parameters can be passed by value or by reference. By-value message systems require that message data be physically copied. Thus, passing value parameters over the network is easy: the stub copies parameters into a message and transmits it. If the semantics of communication primitives allow the client to be suspended until the message has been received, only one copy operation is necessary. Asynchronous message semantics often require that all message data be copied twice: once into a kernel buffer and again into the address space of the receiving process.

This means that the instruction following the send primitive can be executed even before the message is sent. This can lead toward parallel execution of a process and message transmission. The second criterion reflects the client-server cooperation and the programming language approach to dealing with message communication. In this case the client is blocked until the server (receiver) has accepted the request message and 438 CLIENT–SERVER SYSTEMS Trap to kernel, process blocked Client running Send() Client running Trap to kernel Send() Message Client copied to blocked kernel buffer Client blocked Client running Message being sent Client running Returned from kernel, process unblocked Time Time (a) (b) Figure 4.

The message passing approach appears preferable when serialization of request handling is required. The RPC approach appears preferable when there are significant performance benefits to concurrent request handling. RPC is particularly efficient for request–response transactions. Group Communication Distributed computing systems provide the opportunity to improve the overall performance through parallel execution of programs on a network of workstations, decreasing the response time of databases using data replication, supporting synchronous distant meetings and cooperative workgroups, and increasing reliability by service multiplication.

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38.Networking by John G. Webster (Editor)


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