Oct 10 – 14, 2016
San Francisco Marriott Marquis
America/Los_Angeles timezone

ATLAS Data Preparation in Run 2

Oct 13, 2016, 11:15 AM
GG C1 (San Francisco Mariott Marquis)


San Francisco Mariott Marquis

Oral Track 2: Offline Computing Track 2: Offline Computing


Paul James Laycock (University of Liverpool (GB))


In this presentation, the data preparation workflows for Run 2 are
presented. Online data quality uses a new hybrid software release
that incorporates the latest offline data quality monitoring software
for the online environment. This is used to provide fast feedback in
the control room during a data acquisition (DAQ) run, via a
histogram-based monitoring framework as well as the online Event
Display. Data are sent to several streams for offline processing at
the dedicated Tier-0 computing facility, including dedicated
calibration streams and an "express" physics stream containing
approximately 2% of the main physics stream. This express stream is
processed as data arrives, allowing a first look at the offline data
quality within hours of a run end.

A prompt calibration loop starts once an ATLAS DAQ run ends, nominally
defining a 48 hour period in which calibrations and alignments can be
derived using the dedicated calibration and express streams. The bulk
processing of the main physics stream starts on expiry of the prompt
calibration loop, normally providing the primary physics format after a
further 24 hours. Physics data quality is assessed using the same
monitoring packages, allowing data exclusion down to a granularity of
one luminosity block or 1 minute. Meanwhile, the primary
reconstruction output is passed to the ATLAS data reduction framework,
providing data to users typically within 5 days of the end of a DAQ
run, and on the same time scale as the data quality good run list.

Primary Keyword (Mandatory) Data processing workflows and frameworks/pipelines
Secondary Keyword (Optional) Monitoring
Tertiary Keyword (Optional) Computing facilities

Primary author

Paul James Laycock (University of Liverpool (GB))

Presentation materials