perfSONAR-PS is an implementation of the perfSONAR framework in the Perl programming language. This implementation still relies on the underlying perfSONAR specifications and protocols, and is fully compatible with deployed instances of perfSONAR. Current deployment of perfSONAR-PS focuses passive network monitoring (SNMP-based measurements) with active monitoring services under development (i.e., OWAMP, BWCTL). A visual demonstration of the Measurement Points (MPs) and Measurement Archives (MAs) can be seen at http://packrat.internet2.edu/gmaps/index.cgi via a Google Maps demonstration, courtesy of the Stanford Linear Accelerator Center (SLAC). Development of perfSONAR-PS has been a cooperative effort between Internet2, SLAC, University of Delaware, Georgia Institute of Technology, and Fermilab engineers.