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Applications:

Besides the proposed work on network infrastructure and on new ways of provisioning the

network, UltraLight provides grid-enabled analysis tools and applications to support a coherent

end-to-end analysis environment for the LHC (Large Hadron Collider). These services continue

to provide excellent capabilities and UltraLight is now beginning to understand how to include

the Tier-3s into the global computing picture. This work is inspired by the NSF CAIGEE46

project that resulted in the Grid Analysis Environment (GAE) architecture47. The GAE describes

a high level architecture to support end-to-end physics analysis. Ultralight is augmenting the GAE

to make the network an integrated managed resource through end-to-end monitoring. Within an

application context, wide area networks are utilized in at least three scenarios: (1) large scale

production of simulated data (2) single-user view of data analysis, (3) multi-user view of data

analysis. In support of these, UltraLight has researched and developed several tools.

The Clarens Grid Service Toolkit48 has been made available in the Virtual Data Toolkit49 used by

the Open Science Grid and other HEP projects. In addition, the project source code was also

integrated in to the main source code repository used by the CMS experiment. This increased

availability helped the development of useful services both inside and outside the HEP

community. During the latter part of 2006 a new project was started in collaboration with Indiana

University to facilitate CMS Tier 3 physics analysis using Clarens and NaradaBrokering

technologies50. The "Rootlet" service creates instances of the ROOT analysis application51 which

are controlled from lightweight client environments, notably ROOT itself. The Rootlet service

has been deployed on the Caltech Tier 2, as well as the 64 bit environment of the TeraGrid at the

San Diego Supercomputing Center. It was demonstrated at SuperComputing 2006. In analogy to

the Rootlet service, a CMS Pythia generator service was developed for simulation of CMS data

using input provided by the user. SOFE or Service Oriented Front-end Enabler is a Java Webstart

enabled, extensible, cross platform user interface environment to access and interact graphically

with web services. One of the goals of SOFE is to provide a rich front end to XMLRPC/SOAP

based services in order to help scientists with their analysis work through a coherent graphical

interface. Finally, to facilitate the multi-user scenario of data analysis, UltraLight has developed a

mirror service which sits close to the official mass storage device (e.g. on the same LAN) and

mirrors data using the classic Storage Resource Manager (SRM)52 locally, while using the highly

46

CAIGEE: "CMS Analysis: an Interactive Grid-Enabled Environment", ITR NSF 01-149, (see also:

http://pcbunn.cacr.caltech.edu/GAE/CAIGEE/default.htm)

47

F. van Lingen, J. Bunn, I. Legrand, H. Newman, C. Steenberg, M. Thomas, P. Avery, D. Bourilkov, R.

Cavanaugh, L. Chitnis, M. Kulkarni, J. Uk In, A. Anjum, T. Azim "Grid Enabled Analysis: Architecture,

Prototype and Status" in proceedings of Computing for High Energy Physics (CHEP) Interlaken,

Switzerland September 2004. (see also: http://ultralight.caltech.edu/gaeweb/portal )

48

F. van Lingen, J. Bunn, I. Legrand, H. Newman, C. Steenberg, M. Thomas, A. Anjum, T. Azim, "The

Clarens Web Service Framework for Distributed Scientific Analysis in Grid Projects", In Proceedings of

the International Conference on Parallel Processing Workshops, Oslo, Norway, June 2005, IEEE Computer

Society Order Number P2381, ISBN 0-7695-2381-1, pp45-52 (see also: http://clarens.sourceforge.net/ )

49

Virtual Data Toolkit: http://vdt.cs.wisc.edu/index.html

50

S. Pallickara, M. Pierce, H. Gadgil, G. Fox, Y. Yan, Y. Huang, " A Framework for Secure End-to-End

Delivery of Messages in Publish/Subscribe Systems", Proceedings of the 7th IEEE/ACM International

Conference on Grid Computing (GRID 2006). Barcelona, Spain.

51

R. Brun, F. Rademakers, "ROOT - An Object Oriented Data Analysis Framework", Proceedings

AIHENP'96 Workshop, Lausanne, Sep. 1996, Nucl. Inst. & Meth. in Phys. Res. A 389 (1997) 81-86. See

also http://root.cern.ch/ .

52

A. Shoshani, A. Sim, J. Gu, "Storage Resource Managers: Middleware Components for Grid Storage", in

Proceedings of MSS 2002

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