ATLAS Software Kaushik De University of Texas At Arlington based on a tutorial by P. Calafiura (LBNL) LHC Computing Workshop, Ankara May 2, 2008

References Workbook Wiki: Glossary: ATLAS Code LXR indexer: cvs repository: Doxygen summary: computing/links/nightlyDocDirectory/allpackages.html computing/links/nightlyDocDirectory/allpackages.html

Platform and Releases ATLAS software certified on linux SLC4 with gcc 3.4.x in 32 bits mode  Also built in native 64 bits and with gcc 4.1  Port to Mac OS long-standing low priority goal  No Windows version planned Regular developer and production releases  next production release, being validated  latest developer, being validated  latest production “cache” (bugfix patched release, distributed to Tier Xs)

Code Distribution  Each release, and many nightly builds can be installed on your laptop using pacman distribution kits  Mainly geared towards grid production and running existing code  Usable for code development ngAtlasSoftware

CMT Configuration Management Tool  Used for almost everything  Build releases  Setup work environment  Compile and install your code, jo files,...  Generate documentation  Create distribution kits

AtlasLogin Standard environment setup CMT package takes care of setting up core cmt environment ● $CMT..CONFIG,..PATH,..PROJECTPATH ● Differ per release, and per workspace ● Define lookup for rest of environment setup ● CMT project, part of releases and kit Centrally maintained (lots of work) Reasonably customizable Easy to use! > setup ,dbg

Important envars (1)  $CMTCONFIG  Determined by platform, compiler, and dbg or opt. Defines library selection and compiler/linker options  $CMTPATH  Search path for finding packages.  $CMTPROJECTPATH  Search path for finding projects  cmt show path  As envars above can change on-the-fly Bootstrap Settings

Important envars (2)  $JOBOPTSEARCHPATH  For athena.py to find job options files  $DATAPATH  For PathResolver to find data files  $PATH  For shell to find binaries  $LD_LIBRARY_PATH  For dld.so to find libraries  $PYTHONPATH  For python to find modules Final Settings

Athena in a nut shell Athena is based on LHCb's GAUDI

Job Options Use python scripts to configure  Global job properties  Verbosity, inputs, outputs, no of evts to process,...  Hierarchy of JobProperties containers jobproperties.CaloCellFlags.doLArCellEmMisCalib()  Detector tasks  Digitize InDet, Reconstruct Pixel, skip LAr,...   Gaudi Components (Algs, Tools, Services)  via Configurables, python classes mirroring C++  Set component properties, see doc, default values

Selected Top-level Job Options HelloWorld elloWorldOptions.py elloWorldOptions.py elloWorldOptions.py Job Options Examples (more advanced) Digitization (and pileup) leup10_perfmon.py leup10_perfmon.py leup10_perfmon.py RecExCommon (standard offline reco) e/RecExCommon_topOptions.py RecExCommission (combined cosmic reco) ecExCommission_topOptions.py AODtoDPD (primary DPD maker)

Job Transformations Python scripts used to run production tasks  More complex than job options scripts  Variable configuration (e.g. Input files)  Validate results, produce report  Flexible framework helps writing them  Many ready to use  Event Generators  G4 simulation, digitization/pileup  Reconstruction