Speaker
Dr
Simone Campana
(CERN/IT/PSS)
Description
The ATLAS experiment has been running continuous simulated events production since
more than two years. A considerable fraction of the jobs is daily submitted and
handled via the gLite Workload Management System, which overcomes several limitations
of the previous LCG Resource Broker. The gLite WMS has been tested very intensively
for the LHC experiments use cases for more than six months, both in terms of
performance and reliability. The tests were carried out by the LCG Experiment
Integration Support team (in close contact with the experiments) together with the
EGEE integration and certification team and the gLite middleware developers. A
pragmatic iterative and interactive approach allowed a very quick rollout of fixes
and their rapid deployment, together with new functionalities, for the ATLAS
production activities. The same approach is being adopted for other middleware
components like the gLite and CREAM Computing Elements. In this contribution we will
summarize the learning from the gLite WMS testing activity, pointing out the most
important achievements and the open issues. In addition, we will present the current
situation of the ATLAS simulated event production activity on the EGEE infrastructure
based on the gLite WMS, showing the main improvements and benefits from the new
middleware. Finally, some preliminary results on the new flavors of Computing
Elements usage will be shown, trying to identify possible advantages not only in
terms of robustness and performance, but also functionality for the experiment
activities.
Author
Dr
Simone Campana
(CERN/IT/PSS)
