Sep 2 – 9, 2007
Victoria, Canada
Europe/Zurich timezone
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CMS Tier0 - design, implementation and first experiences

Sep 3, 2007, 8:00 AM
10h 10m
Victoria, Canada

Victoria, Canada

Board: 95
poster Computer facilities, production grids and networking Poster 1


Dirk Hufnagel (for the CMS Offline/Computing group)


With the upcoming LHC engineering run in November, the CMS Tier0 computing effort will be the one of the most important activities of the experiment. The CMS Tier0 is responsible for all data handling and processing of real data events in the first period of their life, from when the data is written by the DAQ system to a disk buffer at the CMS experiment site to when it is transferred from CERN to the Tier1 computer centers. The CMS Tier0 accomplishes three principle processing tasks: the realization of the data streaming model of CMS, the automated production of calibration and alignment constants and the first full reconstruction of the raw data. The presentation will describe the data streaming model of CMS and how this is implemented in the CMS trigger/DAQ and the Tier0. For the Tier0 this implementation means a reorganization of the data from a format determined by the demands of the CMS trigger/DAQ to a format that is determined by physics demands. We will also describe the design and implementation of the Prompt Calibration and Prompt Reconstruction workflows. The data flow underlying these workflows will be shown and first results from data challenges and scale tests will be presented.
Submitted on behalf of Collaboration (ex, BaBar, ATLAS) CMS

Primary author

Dirk Hufnagel (for the CMS Offline/Computing group)

Presentation materials

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