LHCb Getting Started page

Everybody is allowed to post a question expecting someone in the experiment will answer.

Keywords

package

is a set of files organised in a tree structure to fulfill a specific purpose.

• Det/DetDesc is the Detector description, Sim/GaussRICH is the RICH simulation

project

is a set of packages to fulfill a specific action

• simulation (Gauss), digitisation (Boole), reconstruction (Brunel), analysis (DaVinci),
• visualisation (Panoramix)
• Look at http://lhcb-comp.web.cern.ch/lhcb-comp/Support/CMT/project_under_CMT.htm

release_area

is the place where project versions reside ready to be used.

• there is one release_area environment variable per project called project release_area
• these environment variables must be set before using any project.
• Gaudi is released on GAUDISOFT = /afs/cern.ch/sw/Gaudi/releases
• LHCb software is released on LHCBRELEASES = /afs/cern.ch/lhcb/software/releases
• LCG software is released on LCG_release_area = /afs/cern.ch/sw/lcg/app/releases
• OpenScientist is released on OSC_release_area = /afs/cern.ch/sw/contrib
• CMT is released on /afs/cern.ch/sw/contrib

release notes

describe the differences between two versions of a package

requirements file

describes the instruction to build a library or/and an application in a package

framework

is a set of packages used by all projects which define basic actions

• histogramming, reading of job options, read/write a file, linking a library. etc...

library

is the result of the compilation of several C++ files

• linker library exports objects
• component library do not export anything

application

is an executable made of a framework linked with several components

externals

LHCb uses several packages download from the web or maintained by different groups

• CLHEP, ROOT, Python, Pythia, SEAL, POOL,...
• is stored on /afs/cern.ch/sw/lcg/externals

lcg

means LHC Computing on the Grid, the software developped by the PH/SFT group is stored on afs

• /afs/cern.ch/sw/lcg/app/SEAL, /POOL, /PI, /LCGCMT, /GENSER, /COOL, /GDML

standalone machine

is a machine which has no connection to any network, must have all packages installed locally.

grid

look at http://www.gridcomputing.com

Tools

CMT

is a Configuration Management Tool . Look at

• http://www.cmtsite.org/ for a general overview
• http://lhcb-comp.web.cern.ch/lhcb-comp/Support/CMT/cmt.htm for How to use it in LHCb.

CVS

is a Code Versionning System. Look at http://lhcb-comp.web.cern.ch/lhcb-comp/Support/CVS/cvs.htm

Doxygen

is a tool to build browsable documentation of C++ code

• each project has its own documentation linked to the documentation of projects it depends on.

Questions without answer

Decay Files

-- FlorenceRanjard - 04 Oct 2005