ATLAS Software

Interactive machines at LHEP

 ui01.lhep.unibe.ch
 ui02.lhep.unibe.ch
 ui03.lhep.unibe.ch

Basic SVN

 svn mkdir -m “Add OQMaps dir" http://svn.lhep.unibe.ch/subv/atlas/SUSY2011/cutflow/OQMaps
 svn co http://svn.lhep.unibe.ch/subv/atlas/SUSY2011/cutflow/OQMaps
 svn add * # All files you have in OQMaps. Directories must be created like above.
 svn ci "Add OQMaps”

LCG Grid Access

To setup the lcg grid environment, setup CVMFS first :

  export ATLAS_LOCAL_ROOT_BASE=/cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase
  source ${ATLAS_LOCAL_ROOT_BASE}/user/atlasLocalSetup.sh
  alias asetup='source $AtlasSetup/scripts/asetup.sh'

Then type:

  lsetup emi

Prepare and check your grid certificate

To prepare your grid certificate, follow the following tutorial (you can adapt the procedure to our interactive nodes):

 https://twiki.cern.ch/twiki/bin/view/AtlasComputing/WorkBook
 https://twiki.cern.ch/twiki/bin/view/AtlasComputing/WorkBookStartingGrid (Preparing your certificate)

To verify the expiry date of your grid certificate installed in the .globus subdir of your home directory (on teh interactive nodes and/or lxplus):

 cd ~/.globus
 openssl x509 -in usercert.pem -noout -enddate

Follow this link[1] for a summary of useful openssl commands.

Use Rucio

To be able to use the rucio commands, you need to setup CVMFS first:

  export ATLAS_LOCAL_ROOT_BASE=/cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase
  source ${ATLAS_LOCAL_ROOT_BASE}/user/atlasLocalSetup.sh
  alias asetup='source $AtlasSetup/scripts/asetup.sh'

Then type

  lsetup rucio

Athena setup with CVMFS

CVMFS is a caching file system which hosts all athena releases and conditions data flat files. It was initially developed for the Cern-VM [2] Virtualization Software.

Athena Setup

To setup a particular release and testarea use the following commands and replace 17.0.2 and /path/to/my/testarea appropriately:

  export ATLAS_LOCAL_ROOT_BASE=/cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase
  source ${ATLAS_LOCAL_ROOT_BASE}/user/atlasLocalSetup.sh
  alias asetup='source $AtlasSetup/scripts/asetup.sh'
  asetup 17.0.2 --testarea /path/to/my/testarea

Conditions DB files

The conditions DB flat files can be found in:

 /cvmfs/atlas-condb.cern.ch/repo/conditions/ 

How to use ROOT libraries from gcc

CINT, the compiler included within ROOT, is not fully reliable from my point of view just for at least two reasons. First, it allows some "bad code writing" hard to debug once you change your ROOT release. Second, CINT, as python, is not a real compiler but just interpret your code for each event. So, if your code becomes sophisticated (kinematic fits,...) CINT spend much more time to interpret your code for each event than running on the event. But, you can use ROOT as libraries from gcc, in a CMT environment in the following :

  source /terabig/atlsoft/LocalSoft/tools/config/setup.sh

Then, go in your package/cmt directory (an example can be found here [3]) This package, written for the SUSY/Trigger analysis as been documented using Doxygen. The documentation can be found here[4](page reachable only from unibe.ch domain)

  cmt config
  source setup.sh
  gmake (or make)
  cd ../run
  And finally run your code calling your program (the name defined in the cmt/requirement file)