Bandwidth Gluttony: Distributed Grid-Enabled Particle Physics Event Analysis

Bandwidth Gluttony image Requests for remote virtual data collections are issued by Grid-based software that is itself triggered from a customized version of the high-energy physics (HEP) analysis tool called ROOT. These requests cause the data to be moved across a wide-area network using both striped and standard GridFTP servers.

For iGrid, distributed databases located at ANL, StarLight, Caltech, CERN and other HEP institutions are used. As the collections are instantiated on the client machine in Amsterdam, ROOT analyzes the data, rendering the results in real time. The virtual data collections are catalogued using the Globus Replica Catalogue. This scheme is a preview of a general Grid-Enabled Analysis Environment that is being developed for CERN's Large Hadron Collider (LHC) experiments.

In a closely related part of the demonstration, an attempt is made to saturate a 10Gbps (OC-192) link between Amsterdam, ANL and StarLight and a 2.5Gbps (OC-48) link between Amsterdam and CERN, by using striped GridFTP channels, and specially tuned TCP/IP stacks. In this test, memory-cached data, in contrast to the file-based ROOT part of the demonstration, is used.

Acknowledgment: Caltech wishes to acknowledge the following awards: USA Department of Energy DE-FC03-99ER25410 (PPDG) and DE-FG03-92-ER40701 (Caltech/CMS), and USA National Science Foundation 8002-48195 (ALDAP) and PHY-0122557 (iVDGL).

ANL efforts are supported by the Mathematical, Information, and Computational Science Division subprogram of the Office of Advanced Scientific Computing Research, USA Department of Energy, under Contract W-31-109-Eng-38.

Also acknowledged are The Globus Project, GriPhyN, PPDG, iVDGL, EU DataGrid and EU DataTAG.

William E. Allcock, John Bresnahan, Joe Link, Joe Insley, ANL, USA
Julian Bunn, Iosif Legrand, Harvey Newman, Steven Low, Sylvain Ravot, Conrad Steenberg, Suresh Singh, Caltech, USA
Jean-Philippe Flatin, CERN, Switzerland

Julian Bunn
California Institute of Technology (Caltech), USA

William E. Allcock
Argonne National Laboratory (ANL), USA


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