Speaker
Report on the experience (or the proposed activity). It would be very important to mention key services which are essential for the success of your activity on the EGEE infrastructure.
This report describes the experience of the ATLAS and the CMS
experiments using the
gLite Workload Management System as a tool to submit both
simulation and analysis
jobs. In fact, this experience has led to a significant
improvement of the WMS
performance and reliability due to a close interaction with the
gLite developers.
Many limitations have been hit, and solved or alleviated. An
evaluation of the
current status of the WMS and how it matches with the
experiment's expectations will
be given.
Describe the scientific/technical community and the scientific/technical activity using (planning to use) the EGEE infrastructure. A high-level description is needed (neither a detailed specialist report nor a list of references).
The LHC experiments will study the physics of p-p interactions at
a centre-of-mass
energy of 14 TeV using the LHC accelerator at CERN. The primary
purpose of their
research is the discovery of the Higgs boson and of new physics
at the TeV scale.
Describe the added value of the Grid for the scientific/technical activity you (plan to) do on the Grid. This should include the scale of the activity and of the potential user community and the relevance for other scientific or business applications
The LHC experiments are undoubtely the most demanding communities
for the EGEE
infrastructure. They have thousands of collaborators who expect
to run their physics
analyses on the data that will be collected starting from late
2007. It is expected
that each experiment will need to run hundreds of thousands of
jobs per day,
including: event reconstruction from raw data, analysis on
reconstructed data, and
Monte Carlo simulation. The management of such amounts of jobs is
an extremely
complicated task and the gLite WMS is being considered as a
candidate to perform it.
With a forward look to future evolution, discuss the issues you have encountered (or that you expect) in using the EGEE infrastructure. Wherever possible, point out the experience limitations (both in terms of existing services or missing functionality)
The most severe limitations found during this work relate to the
ability of the WMS
of working reliably and unattended for long periods of time.
Though a lof of progress
has been made, some issues remain. There are proposals to solve
them, and they will
be discussed.
