Getting started with the CMSSW software at IIHE - Revision history

OLIVIER DEVROEDE omdevroe@vub.ac.be: /* Prepare the CMSSW working area */

2018-08-22T11:41:04Z

Prepare the CMSSW working area

← Older revision		Revision as of 11:41, 22 August 2018
Line 62:		Line 62:
	scramv1 p CMSSW CMSSW_4_4_5		scramv1 p CMSSW CMSSW_4_4_5
	cd CMSSW_4_4_5/src		cd CMSSW_4_4_5/src
	eval ~~<tt>~~scramv1 runtime -sh~~</tt>~~		eval `scramv1 runtime -sh`
	</pre>		</pre>
	----		----

	=== Get the necessary code ===		=== Get the necessary code ===
	*checkout the source code of the libraries that you want to use or modify. Here we will produce a few fastsim ttbar events with production of a PAT-tree in the end:		*checkout the source code of the libraries that you want to use or modify. Here we will produce a few fastsim ttbar events with production of a PAT-tree in the end:

OLIVIER DEVROEDE omdevroe@vub.ac.be: /* Login to a machine and define the CMS environment variables */

2017-12-22T10:34:31Z

← Older revision		Revision as of 10:34, 22 December 2017
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	source $VO_CMS_SW_DIR/cmsset_default.sh		source $VO_CMS_SW_DIR/cmsset_default.sh
	</pre>		</pre>
	or for tcsh :
			*or for tcsh :

	<pre>		<pre>
	source $VO_CMS_SW_DIR/cmsset_default.csh		source $VO_CMS_SW_DIR/cmsset_default.csh
Line 33:		Line 35:
	export CVSROOT=:ext:<your user name>@cmscvs.cern.ch:/local/reps/CMSSW		export CVSROOT=:ext:<your user name>@cmscvs.cern.ch:/local/reps/CMSSW
	</pre>		</pre>
	or for tcsh :
			*or for tcsh :

	<pre>		<pre>
	setenv CVSROOT :ext:<your user name>@cmscvs.cern.ch:/local/reps/CMSSW		setenv CVSROOT :ext:<your user name>@cmscvs.cern.ch:/local/reps/CMSSW
	</pre>		</pre>
	where you replace <your user name> by your user name at cern, and make a kerberos token :
			*where you replace <your user name> by your user name at cern, and make a kerberos token :

	<pre>		<pre>
	kinit		kinit
Line 43:		Line 49:
	log in with your cern password.		log in with your cern password.
	----		----

	=== Prepare the CMSSW working area ===		=== Prepare the CMSSW working area ===
	*First, list the CMSSW versions installed locally		*First, list the CMSSW versions installed locally

Maintenance script: Created page with " === A few words on our User Interfaces === *The policies for usage of the User Interfaces can be found here. Please read them carefully. === Login to a ma..."

2015-08-26T12:28:33Z

Created page with " === A few words on our User Interfaces === *The policies for usage of the User Interfaces can be found here. Please read them carefully. === Login to a ma..."

New page

=== A few words on our User Interfaces ===

*The policies for usage of the User Interfaces can be found [[policies| here]]. Please read them carefully.

=== Login to a machine and define the CMS environment variables ===
*Login to a user interface :
e.g:
<pre>
ssh -X <tt>whoami</tt>@m1.iihe.ac.be
</pre>
*Source the CMS environment :
<pre>
source $VO_CMS_SW_DIR/cmsset_default.sh
</pre>
or for tcsh :
<pre>
source $VO_CMS_SW_DIR/cmsset_default.csh
</pre>

*Adapt your SCRAM_ARCH environment variable :

Keep in mind that this initial source will affect the value of the environment variable SCRAM_ARCH. Depending on which UI you are, SCRAM_ARCH can take two different values : slc4_ia32_gcc345 for UIs in SL4, and slc5_ia32_gcc434 for UIs in SL5. As a practical consequence, if you want to work with CMSSW releases older than CMSSW_3_4_0 on an SL5 UI, than you must change SCRAM_ARCH :
<pre>
export SCRAM_ARCH=slc4_ia32_gcc345
</pre>
If you want to use CMSSW4 releases, then you must set SCRAM_ARCH like this :
<pre>
export SCRAM_ARCH=slc5_amd64_gcc434
</pre>
*Define the code cvs repository :
<pre>
export CVSROOT=:ext:<your user name>@cmscvs.cern.ch:/local/reps/CMSSW
</pre>
or for tcsh :
<pre>
setenv CVSROOT :ext:<your user name>@cmscvs.cern.ch:/local/reps/CMSSW
</pre>
where you replace <your user name> by your user name at cern, and make a kerberos token :
<pre>
kinit
</pre>
log in with your cern password.
----
=== Prepare the CMSSW working area ===
*First, list the CMSSW versions installed locally
<pre>
scramv1 list
scramv1 list | grep CMSSW
</pre>
These commands also show the paths to the installation directories.
*Select the version you want to work with (here: <tt>CMSSW_2_2_6</tt>)
*Install a CMSSW working area, go to the src subdirectory and prepare to compile and run
<pre>
scramv1 p CMSSW CMSSW_4_4_5
cd CMSSW_4_4_5/src
eval <tt>scramv1 runtime -sh</tt>
</pre>
----
=== Get the necessary code ===
*checkout the source code of the libraries that you want to use or modify. Here we will produce a few fastsim ttbar events with production of a PAT-tree in the end:
<pre>
cvs co -r CMSSW_4_4_5 PhysicsTools/PatAlgos/test; cd PhysicsTools/PatAlgos/test
</pre>
----
=== Run CMSSW interactively and produce a few events ===
The parameters for CMSSW are specified in a text file called the config file. Run it with the command:
<pre>
cmsRun patLayer1_fromScratch_fast.cfg.py
</pre>
You should see one root file appear: PATLayer1_Output.fromScratch_fast.root

At this stage you should learn more about CMSSW and PAT by studying the
[https://twiki.cern.ch/twiki/bin/view/CMS/WorkBook CMSSW Workbook].

----
=== Troubleshooting ===
If you meet troubles, please have a look in our FAQ :
[[FAQ_CMSSW_on_the_Grid| FAQ CMSSW on the Grid on proxy and more!]]

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