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Beowulf is a design for high-performance parallel computing clusters on inexpensive personal computer hardware. The name comes from the main character in the Old English epic poem Beowulf.

Cluster is a widely-used term meaning independent computers combined into a unified system through software and networking. At the most fundamental level, when two or more computers are used together to solve a problem, it is considered a cluster. Clusters are typically used for High Availability (HA) for greater reliability or High Performance Computing (HPC) to provide greater computational power than a single computer can provide.

Beowulf Clusters are scalable performance clusters based on commodity hardware, on a private system network, with open source software (Linux) infrastructure. The designer can improve performance proportionally with added machines. The commodity hardware can be any of a number of mass-market, stand-alone compute nodes as simple as two networked computers each running Linux and sharing a file system or as complex as 1024 nodes with a high-speed, low-latency network.

A Beowulf cluster is a group of usually identical PC computers running a Free and Open Source Software (FOSS) Unix-like operating system, such as BSD, Linux or Solaris. They are networked into a small TCP/IP LAN, and have libraries and programs installed which allow processing to be shared among them.

There is no particular piece of software that defines a cluster as a Beowulf. Commonly used parallel processing libraries include MPI (Message Passing Interface) and PVM (Parallel Virtual Machine). Both of these permit the programmer to divide a task among a group of networked computers,and recollect the results of processing. A common misconception is that arbitrary software will run faster on a Beowulf. Software must be revised to take advantage of the cluster.

Class I clusters are built entirely using commodity hardware and software using standard technology such as SCSI, Ethernet, and IDE. They are typically less expensive than Class II clusters which may use specialized hardware to achieve higher performance.

What are Beowulf systems being used for these days?

Traditional technical applications such as simulations, biotechnology, and petro-clusters; financial market modeling, data mining and stream processing; and Internet servers for audio and games.

Common uses are traditional technical applications such as simulations,Beowulf programs are usually written using languages such as C and FORTRAN. They use message passing to achieve parallel computations.

Where does the name Beowulf originate?

Beowulf is the earliest surviving epic poem written in English. It is a story about a hero of great strength and courage who defeated a monster called Grendel.

"Famed was this Beowulf: far flew the boast of him, son of Scyld, in the Scandian lands. So becomes it a youth to quit him well with his father's friends, by fee and gift, that to aid him, aged, in after days, come warriors willing, should war draw nigh, liegemen loyal: by lauded deeds shall an earl have honor in every clan."