Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.35: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Interactive Parallel Analysis with PROOF — •Schwarz Kilian — GSI, Planckstr. 1, 64291 Darmstadt, Germany

To be prepared for the parallel analysis of distributed datasets the different options of setting up a PROOF cluster are investigated at GSI and GridKa.

The Parallel ROOT Facility, PROOF, is an extension of the ROOT system. It enables physicists to analyse large sets of ROOT files in parallel on remote computer clusters.

PROOF consists of a 3-tier architecture, the ROOT client session, the PROOF master server and the PROOF slave servers. PROOF daemons are assigned on demand which start according to a predefined config-file the masterserver to which the user connects. The master server in turn creates, again via the PROOF daemons, slave servers on the nodes in the cluster, which ask the master for work packets by using a pull protocoll. The results can be merged at the end of the session. Such an environment has been set up and tested. Hereby we compared the possibility of setting up a dedicated PROOF cluster with the option to integrate PROOF into the local batch system.

Parallel analysis of worldwide distributed data sets is possible by combining PROOF with Grid technology. This has been tested by using the ALICE Grid implementation AliEn, where the PROOF client connects to a PROOF master server running on an AliEn core service machine. The PROOF master connects to PROOF daemons in distributed sites through an AliEn TCP routing service. This enables connectivity and connection control to computing farms on private networks.