The code in this directory is meant to produce AO2D.root output files. There are two such producers:

• o2-aod-producer-workflow that produces AO2D.root from reconstructed data (whether from simulations or the experiment). The output will contain reconstructed tracks "calo" hits, and so on.
• o2-aod-mc-producer-workflow that produces AO2D.root from simulation data only. The output will only contain the simulation particles and collision headers.

You need O2DPG installed.

Then, a script a la

#!/bin/bash
#
# A example workflow MC->RECO->AOD for a simple pp production
# excluding ZDC
NWORKERS=${NWORKERS:-6}
SIMENGINE=${SIMENGINE:-TGeant4}

${O2DPG_ROOT}/MC/bin/o2dpg_sim_workflow.py \
             -eCM 14000 \
             -col pp \
             -gen pythia8 \
             -proc "cdiff" \
             -tf 2  \
             -ns 50 \
             -e ${SIMENGINE} \
             -j ${NWORKERS} \
             -run 303000 \
             -seed 624 \
             -interactionRate 50000

${O2DPG_ROOT}/MC/bin/o2_dpg_workflow_runner.py -f workflow.json -tt aod

will set-up a chain and run it. The above will make 2 time-frames, each with 50 pp collisions at sqrt(s)=14TeV generated by Pythia8.

See also this page for more on simulations with O2.