allow to set total cpulimit via env variable

Author: sawenzel

MC/run/PWGHF/embedding_benchmark.sh

@@ -29,4 +29,4 @@ ${O2DPG_ROOT}/MC/bin/o2dpg_sim_workflow.py -eCM 5020 -col pp -gen pythia8 -proc
                                                         -j ${NWORKERS} --embedding -interactionRate 50000
 
 # run workflow
-${O2DPG_ROOT}/MC/bin/o2_dpg_workflow_runner.py -f workflow.json
+${O2DPG_ROOT}/MC/bin/o2_dpg_workflow_runner.py -f workflow.json --cpu-limit ${CPULIMIT:-8}