Ganglia is a BSD-licensed open-source project that grew out of the University of California, Berkeley Millennium Project which was initially funded in large part by the National Partnership for Advanced Computational Infrastructure (NPACI) and National Science Foundation RI Award EIA-9802069.

It has been used to link clusters across university campuses and around the world and can scale to handle clusters with 2000 nodes. The implementation is robust, has been ported to an extensive set of operating systems and processor architectures, and is currently in use on thousands of clusters around the world. It uses carefully engineered data structures and algorithms to achieve very low per-node overheads and high concurrency. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization. It is based on a hierarchical design targeted at federations of clusters.

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids.

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