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A typical computer cluster has some prominent components which are used to do a specific task [6]. The components are as follows:

1 Multiple high-performance computers (PCs, workstations or SMPs)

2 State-of-the-art operating systems (layered or micro-kernel based)

3 High-performance networks/switches (such as Gigabit Ethernet and Myrinet)

4 Network interface cards (NICs)

5 Fast communication protocols and services (such as active and fast messages)

6 Cluster middleware (single system image (SSI) and system availability infrastructure):Hardware (such as digital (DEC) memory channel, hardware DSM, and SMP techniques),Operating system kernel or gluing layer (such as Solaris MC and GLUnix),Applications and subsystems applications (such as system management tools and electronic forms),Runtime systems (such as software DSM and parallel file system),Resource management and scheduling software, such as ISF (load sharing facility),CODINE (computing in distributed networked environments)

7 Parallel programming environments and tools (such as compilers, PVM (parallel virtual machine), and MPI (message passing interface)), and

8 Applications of sequential, parallel or distributed computing.