Overview

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Useful links

Setting CMSSW

The CMSSW versions are rapidly evolving, the recommendation is to use the most recent version. To get the full versions list run scram list CMSSW

Create a new empty/template plugin

The following lines will build a new analysis plugin. For more information see WorkBookWriteFrameworkModule.

Create the template:

mkedanlzr DemoAnalyzer
cd DemoAnalyzer
scram b -j

It will create ProtonAnalyzer.cc which is the cpp main code

Add python configuration python folder

DemoAnalyzer/python/runMe_example.py  Hide 

import FWCore.ParameterSet.Config as cms
import FWCore.ParameterSet.VarParsing as VarParsing

options.parseArguments()
process = cms.Process("Demo")

# import of standard configurations
process.load("FWCore.MessageLogger.MessageLogger_cfi")
process.load('Configuration.StandardSequences.Services_cff')
process.MessageLogger.cerr.FwkReport.reportEvery = cms.untracked.int32(100)

process.maxEvents = cms.untracked.PSet( input = cms.untracked.int32(options.maxEvents) )
process.source = cms.Source("PoolSource",fileNames = cms.untracked.vstring(options.inputFiles))

process.demo = cms.EDAnalyzer('DemoAnalyzer')

process.p = cms.Path(process.demo)

Then you can run the analysis using the following command:

  cmsRun $CMSSW_BASE/src/DemoAnalyzer/python/runMe_example.py

Producing output file

It is helpful to inspect the new information added to the file after running a process. Add the following lines to your configuration file:

process.out = cms.OutputModule("PoolOutputModule",
       fileName = cms.untracked.string("test_output.root"),
       outputCommands = cms.untracked.vstring("drop *",
            "keep *_*_*_PROCESSTAG",
	),
	compressionAlgorithm = cms.untracked.string('LZMA'),
	compressionLevel = cms.untracked.int32(4),
	dropMetaData = cms.untracked.string('ALL')
    )
process.anal = cms.EndPath(process.out)	

-- MichaelPitt - 2021-05-09