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Edinburgh (ECDF) Site update

Edinburgh (ECDF) Site update. Wahid Bhimji Andy Washbrook And others including ECDF systems team Not a comprehensive update but what ever occurred to me yesterday . Edinburgh Setup Reminder. ECDF Grid Tier2 Cluster shared with other uni users: ~3000 cores in total

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Edinburgh (ECDF) Site update

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  1. Edinburgh (ECDF) Site update Wahid Bhimji Andy Washbrook And others including ECDF systems team Not a comprehensive update but what ever occurred to me yesterday

  2. Edinburgh Setup Reminder ECDF Grid Tier2 • Cluster shared with other uni users: • ~3000 cores in total • Storage just for gridPP : • ~175 TB in DPM form on dense DELL boxes • Systems team who do most hardware /os Local computing • Run physics-wide • Andy has to interact but I’m not going to talk much about hardware etc. much here • Will talk a bit about ATLAS user running on it

  3. ECDF: New Kit • GridPPhardware cash: • most spent on storage • (DELL R510 + 2 MD1200) *3 + 2 R510s • 175 -> 350 (+) delivered TB (by june) • Also middleware servers – soon all on newish hw • DRI cash • mostly spent by networking guys improving outgoing links to 10 Gig resilient links • (matching investment from uni) • Also 10gig switch for pool servers; new racks etc.

  4. King’s Buildings Appleton Tower ACF srif-kb1 srif-at1 “SRIF” srif-bush1 kb7 at5 EdLAN Backbone S-PoP S-PoP2 JANET to Leeds (currently active) JANET to Glasgow (currently standby) New network layout – old links grayed out

  5. Operations Generally running smoothly Bit of deployment: cvmfs; cream ces etc. Lots (for us) of running jobs (up to ~1700) Though should be able to run 3000

  6. Availability: was great for ages… ECDF APRIL ATLAS Availability 99%

  7. but all good things come to an end? • In last week qs have been up and down • Cmtsite timeout • Other site see it – but seems to turn us off more?; and why now? Discuss? • Also datadisk blacklisting • “alpha” site for ATLAS with decent no. of jobs means ATLAS expect to be able to place data • We don’t actually have bigboy level disk … • but do have some being commissioned

  8. Multicore Involved in three areas for ATLAS multicore readiness:  • AthenaMPperformance measurement • CPU/memory usage, serialisation timing, optimum job length and number of input files • ATLAS queue validation •  Working with ATLAS distributed computing team to validate queue readiness for all sites wishing to run ATLAS multicorejob • In UK: RAL, ECDF, Glasgow, Lancaster • Multicorescheduler simulation • Developedtestbed to simulate scheduler response to jobs requesting different numbers of CPU cores • Used to identify resource contention that leads to loss of job throughput See Andy’s talk at GridPP – and aCHEP2012 talk: "Multi-core job submission and grid resource scheduling for ATLAS AthenaMP"

  9. Local computing: ATLAS Running on T2 files • ATLAS users getting files locally with dq2 • Get failures and running out of local disk space • So read interactively on desktop from T2 LOCALGROUPDISK instead • Transfer in managed with atlas central Datri tool • Files opened with rfio directly • They can run on ecdf batch (or condor) to scale up • Need few instructions for users but works fine https://www.gridpp.ac.uk/wiki/RFIO_Local_Access • Users need to use ROOT TTreeCache for decent network read • Also Tree->GetEntriesFast to avoid slow jobs start if lots of small files • Obviously depends on network to T2.

  10. Conclusions ECDF running well (x-fingers) • Has allowed time for some other interesting stuff • We are getting quite a big site from ATLAS side: • T2D • Analysis jobs • GROUP space for SOFT-SIMUL • Multicorejobs • That brings responsibility and expectations on hardware

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