Speaker
Dr
Daniele Bonacorsi
(INFN-CNAF, Bologna, Italy)
Description
Early in 2007 the CMS experiment deployed a traffic load generator infrastructure, aimed at providing CMS
Computing Centers (Tiers of the WLCG) with a means for debugging, load-testing and commissioning data
transfer routes among them. The LoadTest is built upon, and relies on, the PhEDEx dataset transfer tool as a
reliable data replication system in use by CMS. On top of PhEDEx, the CMS LoadTest 2007 exploited a light file
generator mechanism; a simple system to customize test loads applied to inter-site links and to decouple the
testing scopes for various routes. The implementation enables each CMS Tier to plug-in in the test and to exercise
its connectivity to other CMS Tiers as desired, so to focus on debugging specific routes until complete
commissioning of all links requested by the CMS Computing Model. The monitoring and visualization features of
the PhEDEx tool provide an integrated way to overview the LoadTest activities at the same time as production
transfers. The CMS LoadTest infrastructure was setup since the beginning of 2007 in preparation to the CMS
Computing, Software and Analysis Challenge (CSA07) and then extensively used the winter and spring months to
constantly exercise the transfer links to the needed scale, and to help CMS Tiers to address WLCG milestones.
Experiences with this infrastructure and the achieved results are reviewed in this paper.
| Submitted on behalf of Collaboration (ex, BaBar, ATLAS) | CMS Computing group |
|---|
Author
Dr
Daniele Bonacorsi
(INFN-CNAF, Bologna, Italy)
