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Created page with " === Login to a machine and define the CMS environment variables === *login to the lxpub2 or lxpub3 machine e.g: ssh -X username@lxpub2.iihe.ac.be *source the CMS environmen..."

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=== Login to a machine and define the CMS environment variables ===
*login to the lxpub2 or lxpub3 machine
e.g: ssh -X username@lxpub2.iihe.ac.be
*source the CMS environment
setenv VO_CMS_SW_DIR /msa3/cmssoft
source $VO_CMS_SW_DIR/cmsset_default.csh ## initialize the cms env
*define the code cvs repository
alias cmscvsroot 'source $CMS_PATH/utils/cmscvsroot.csh'
cmscvsroot CMSSW
----
 
=== Prepare the CMSSW working area ===
Follow these steps:
*install a CMSSW working area, go to the src subdirectory and prepare to compile and run
scramv1 p CMSSW CMSSW_1_0_1; cd CMSSW_1_0_1/src; eval <tt>scramv1 runtime -csh</tt>
----
 
=== Get the necessary code and compile it ===
*log onto the cvs code server; type 98passwd as password
cvs login
CVS password:
*checkout the source code of the libraries that you want to use or modify. Here we will use the interface to the Pythia event generator
cvs co -r CMSSW_1_0_1 IOMC/GeneratorInterface/test; cd IOMC/GeneratorInterface/test
*compile the code
scramv1 b
----
 
=== Run CMSSW interactively and produce a few events ===
The parameters for CMSSW are specified in a text file called the config file. This file can include other config files using the #include directive. Let's run the standard example which produces Higgs events decaying into 4 muons in the final state, and plots a few distributions:
cmsRun pythiaHZZ4mu+analysis.cfg

You should see two root files appear: one with the generated events stored in HepMC format, and one with the distribution histograms. Did it work ? In case of problems, do not hesitate to contact Jan Heyninck or Pascal Vanlaer.

At this stage you should learn more about CMSSW by studying the
[https://uimon.cern.ch/twiki/bin/view/CMS/WorkBook CMSSW Workbook], chapters 2 to 4.

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Maintenance script: Created page with " === Login to a machine and define the CMS environment variables === *login to the lxpub2 or lxpub3 machine e.g: ssh -X username@lxpub2.iihe.ac.be *source the CMS environmen..."

Maintenance script: Created page with " === Login to a machine and define the CMS environment variables === login to the lxpub2 or lxpub3 machine e.g: ssh -X username@lxpub2.iihe.ac.be source the CMS environmen..."