As compared to the workstation server model the processor pool model allows

As compared to the workstation server model the

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As compared to the workstation-server model, the processor-pool model allows better utilization of the available processing power of a distributed computing system. This is because In the processor-pool model, the entire processing power of the system is available for use by the currently logged-users, whereas this is not true for the workstation-server model in which several workstations may be idle at a particular time but they cannot be used for processing the jobs of other users. Furthermore the processor-pool model provides greater flexibility than the workstation-server model in the sense that the system's services can be easily expanded without the need to install any more computers 8
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Unit 1 Architecture of Distributed Systems The professors in the pool can be allocated to act as extra servers to carry any additional load arising from an increased user population or to provide new services. However, the processor-pool model is usually considered to be unsuitable for high-performance interactive applications, especially those using graphics or window systems. This is mainly because of the slow speed of communication between the computer on which the application program of a user is being executed and the terminal via which the user is interacting with to system. The workstation-server model is genially considered to be more suitable for such applications. Out of the four models describe above, the workstation-server model is the most widely used model for building distributed computing systems. This is because a large number of computer users only perform simple interactive tasks such as editing jobs, sending electronic mails, and executing small programs. The workstation-server model is ideal for such simple usage. However, in a working environment that has groups of users who often perform jobs going massive computation the processor-pool model is more attractive and suitable. In the processor pool model, the ration of processors to users is greater than one. The model attempts to allocate one or more processors to a user to complete the task. Once the user’s task is completed the assigned processors are returned to the pool. Examples: Amoeba system is combination of workstation and processor pool models. Each user performs quick interactive response type of task on the workstation (such as editing). User can access to pool of processors for executing jobs that need significant numerical computations. The Hybrid Model To combine the advantages of both the workstation-server and processor-pool models, a hybrid model may be used to build a distributed computing system. The hybrid model is based on the workstation- server model but with the addition of a pool of processors. The processors in the pool can be allocated dynamically for computations that are too large for workstations or that requires several computers concurrency for efficient execution. In addition to efficient execution of computation-intensive jobs, the
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