Sep 2 – 9, 2007
Victoria, Canada
Europe/Zurich timezone
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The CMS LoadTest 2007: an infrastructure to exercise CMS transfer routes among WLCG Tiers

Sep 5, 2007, 8:00 AM
10h 10m
Victoria, Canada

Victoria, Canada

Board: 19
poster Distributed data analysis and information management Poster 2


Dr Daniele Bonacorsi (INFN-CNAF, Bologna, Italy)


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

Primary author

Dr Daniele Bonacorsi (INFN-CNAF, Bologna, Italy)

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