By Morrison S.R.

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4 Copyright © 2003 3. Efficiency (Ep) – The efficiency of a parallel computation is defined as the ratio between the speedup factor and the number of processors: Ep = Sp P = T1 pT p Efficiency is a measure of the cost-effectiveness of computations. 4. Redundancy (Rp) – The redundancy of a parallel computation is the ratio between the total number of operations Op executed in performing some computation with p processors and the number of operations O1 required to execute the same computation with a uniprocessor: Rp = Op O1 Rp is related to the time lost because of overhead, and is always larger than 1.

The Win32 API allows the applications programmer access to the many functions of the Windows platform and is the point of interface for the cluster middleware layer of software. [31] [32] One of the drawbacks of using the Windows 2000 platform (standard and clustering versions) for clustering is cost. A cluster is designed to function as a single machine, however in most cases we use a local operating system on each node of the system and with the W2K licensing model this would mean we would need to pay a licence cost per node.

Process management – Global process management extends process operations so that the location of a process is transparent to the user. e. a process can move from one node to another during its lifetime to achieve load balancing or for failover. • Networking – SUN Cluster implements networking systems to support the cluster implementation. • Global distributed file system – SUN Cluster implements a global file system to simplify file system operations and process management over the entire cluster.

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