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SL(C)5 and production news

SL(C)5 and production news. ALICE-LCG TF November 6, 2008. SL(C) 5. Currently certified at CERN (gcc 4.3) SLC5 nodes deployed and available CE and queues for ALICE were set by IT Since yesterday we are running at CERN on SLC5 Compatibility mode – gcc 3.4 compiled code

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SL(C)5 and production news

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  1. SL(C)5 and production news ALICE-LCG TF November 6, 2008

  2. SL(C) 5 • Currently certified at CERN (gcc 4.3) • SLC5 nodes deployed and available • CE and queues for ALICE were set by IT • Since yesterday we are running at CERN on SLC5 • Compatibility mode – gcc 3.4 compiled code • Seems to be working fine • No surprises expected

  3. SL(C) 5 - challenges • Working in compatibility mode is a drawback • The code must be compiled on the ‘lowest common denominator’ system, i.e. SLC4, gcc 3.4 • And work like this until majority of resources are migrated to the new OS • SL(C)3->SL(C)4 migration took about 1.5 years! • Compatibility libraries are always a mess (do we also need gcc 3.4 on SL(C)5!) • Partial code compilation ‘on the fly’ (user analysis) will not work • Lose out on the system improvements, especially advanced compilers options and features

  4. SL(C) 5 – challenges (2) • Application/ALICE Grid software on SL(C)5 • Should not be a problem – all ALICE applications are already ported (semi-privately) to new OS-es • Client Grid software (aliensh) – already there • AliEn – same as above • Services • WN – SL(C)5 version tests next week • VO-box (UI, proxy renewal) • The rest of the services (important for the sites) • The two above are still not discussed (and I am not aware of the plans)

  5. SL(C) 5 – ALICE desiderata • Aggressive updates of all sites to SL(C)5 • As soon as possible and complete migration in few months timeframe • Native SLC5 should be sufficient for us – no compatibility should be required • Complete the SLC5 tests at CERN • Provide standard build system for SLC5 and build all code • Work with sites to complete the updates as we did last year for the SL(C)4 migration • Should be accomplished before restart of LCC otherwise a delay of 1 year

  6. Production news • Two Pb+Pb production approved by the Physics board and being configured to start • 100Kevents each – relatively small scale, but a welcome load • p+p (300Mio events) production still under discussion • User analysis ongoing – the load is increasing steadily • Still not a constant load on the Grid • SEs are holding well and more are added • Disk-based SE at CNAF (StoRm + xrootd) configured

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