What is "perfsonar"

perfSONAR ("Performance focused Service Oriented Network monitoring ARchitecture") is open source toolkit for running network tests across multiple domains, and being used extensively by the network research and education community, with over 1300 deployments as of Feb. 2015. perfSONAR development and support is led by an international collaboration that includes Internet2, ESnet, Indiana University, and the EU funded GN2 JRA1 project. The name of the project reflects the choice of a service-oriented architecture for the software implementation.