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ATLAS Tier0 Operations

ATLAS Tier0 Operations. ATLAS Software & Computing Workshop Mon, 04 April 2011. Tier0 status and plans. Getting ready for 400Hz data taking reconstruction time at the Tier0 storage capacity resources to run jobs RAW compression Improvements in monitoring. Tier0 status report.

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ATLAS Tier0 Operations

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  1. ATLAS Tier0Operations ATLAS Software & Computing Workshop Mon, 04 April 2011

  2. Tier0 status and plans Getting ready for 400Hz data taking • reconstruction time at the Tier0 • storage capacity • resources to run jobs • RAW compression Improvements in monitoring ATLAS Software & Computing Workshop

  3. Tier0 status report Concerns on software side: pileup, events size • many s/w testing campaigns (“Big Chain Tests”, BCTs), frequent processing of the same data with several different configuration tags • Run 167607 (last year, μ ~ 2-3) • Run 178044, 178109 (recent, μ ~ 8) • Reco wall time now well below 15s for all streams • with 3000 job slots, allows on average (400Hz DAQ rate) @ (50% LHC efficiency) • see presentation by Thomas Kittelmann @ ATLAS Weekly meeting ATLAS Software & Computing Workshop

  4. Tier0 status report Resource extension in progress • staged extension of the main CASTOR production pool t0atlas • to cope with I/O, more disk buffer comes “for free” (currently 8GB/s concurrent I/O) • 74 servers (~700GB) • (currently) 106 servers (~1PB)  (eventually) 116 servers (1.2PB) • taken from the atldata pool ATLAS Software & Computing Workshop

  5. Tier0 next steps Current LSF status: • atlast0 cluster • ~3400 cores: 3000 for reco slots, 300 for CAF/TMS, rest for RAW, AOD, DESD, NTUP, HIST merging, beamspotproc and other special tasks LSF reconfiguration: in case of high load, Tier0 will “spill over” to the ATLAS public share • priority over other jobs • “transparent” reduction of the share of users’ and Grid jobs • no pre-empting • currently up to 50% of the public share foreseen to be shared timescale: 1-2 weeks ATLAS Software & Computing Workshop

  6. Tier0 next steps RAW compression • achievable volume reduction: 50% • event-level compression example code provided by Wainer Vandelli • preserving event and file structure • using tdaq online libraries • combined RAW compresion and merging to be tested on Tier0 timescale: 1-2 weeks • final deployment has also to wait for offline s/w development • modified tdaq libraries have to be ported to offline release to read back compressed events ATLAS Software & Computing Workshop

  7. Tier0 monitoring conTZole 1.0 • User oriented, user configurable • Rock solid reliably designed • Built using the modern Web 2.0 technology • AJAX (jQuery, xmlhttp), Python • Most recent improvements • Global Tier-0 processing statistics • API to access Tier-0 data from 3rd party applications ATLAS Software & Computing Workshop

  8. Tier0 monitoring atlas-tz-monitoring.cern.ch ATLAS Software & Computing Workshop

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