The gLite Standard Worker Node is a set of clients required to run jobs sent by the gLite Computing Element via the Local Resource Management System.

The gLite WN now includes the SWAT packages. SWAT (Site Wide Area Testing) is a grid monitoring tool that collects information about the configuration of Worker Nodes in the production grid infrastructure. It does this by providing a jobwrapper that runs before the execution of every grid job. It will check the following:

• Structural information (hostname, queue, ce, site)
• Job information (id, vo, vomsgroup/role/cap...)
• System information (osname, processor, RAM...)
• Version of java, perl, python, gLite, GFAL, glexec

Information about a worker node and its environment are sent to SWAT server via ActiveMQ messages. A server retrieves these information and stores them in SWAT database. The web application visualizes the data for statistical purposes (http://gridops.cern.ch/swat/region/).