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How-To CMS

How to access a Jupyter Notebook from lxplus?

  1. Create a ssh local tunnel to lxplus, asuming you were connected to lxplus749:

    ssh -L 5432:localhost:5432 [email protected]

    Then, you can access locally by using the link provided by jupyter in your local machine (no need to setup a browser proxy).

  2. (Optional) Create a virtual environment on lxplus:

    virtualenv jupyter_notebook_env
source jupyter_notebook_env/bin/activate
pip install --upgrade pip
pip install jupyter

    xrootd would be needed to access remotely data and mc root files from CERN cluster

    pip install xrootd
pip install uproot
pip install pandas

  3. Set up a proxy and jupyter notebook server

    Set up voms proxy if needed:

    voms-proxy-init --voms cms

    Run jupyter (use an available port)

    jupyter notebook --no-browser --port=5432 &

    Now you can access using the link provided by jupyter

How to get a list of files from DAS?

dasgoclient -query "file dataset=/DYJetsToTauTau*/*NanoAODv6*/NANOAODSIM"

How to open CMS root-like files using root?

To be able to read CMSSW objects directly from ROOT, we would need to load FWLiteCore:

gSystem->Load("libFWCoreFWLite.so");
FWLiteEnabler::enable();
gSystem->Load("libDataFormatsFWLite.so");
gSystem->Load("libDataFormatsPatCandidates.so");

Note: This requires cmsenv.

How to quickly explore a ROOT TTree?

const char *dasFile = "root://cmsxrootd.fnal.gov//dasUrl.root";
TFile *f = TFile::Open(dasFile);
auto t1 = (TTree*)f->Get("Events");
t1->Print("Tau_*");
t1->Draw("nJet","nTau>=2&&Tau_charge[0]!=Tau_charge[1]" /*TCut*/);
t1->Scan("nTau:Tau_pt:Tau_charge","nTau>=2&&Tau_charge[0]!=Tau_charge[1]" /*TCut*/);

NanoAOD production from MiniAOD

Note: Using CMSSW_10_2_10 release:

cmsDriver.py execution to produce NanoAOD file:

cmsDriver.py testNanoAOD -s NANO --mc \
             --n -1 \
             --eventcontent NANOAODSIM \
             --datatier NANOAODSIM \
             --conditions 94X_mcRun2_asymptotic_v3 \
             --filein /store/mc/RunIISummer16MiniAODv3/ttHToNonbb_M125_TuneCUETP8M2_ttHtranche3_13TeV-powheg-pythia8/MINIAODSIM/PUMoriond17_94X_mcRun2_asymptotic_v3-v2/120000/F24F2D5E-DDEC-E811-AF50-90B11C08AD7D.root

What's the content of (centrally produced) NanoAOD?

List of Branches for Data List of Branches for MC