====== Proof On Demand ======

Proof on Demand is a facility to send ROOT jobs via Proof to worker nodes instantiated by our batch system. More information is here - [[http://pod.gsi.de/]]

===== Simple config =====

<code>
setupATLAS
localSetupPoD PoD-3.16p1-python2.7-x86_64-slc6-gcc48-boost1.55
pod-server start
pod-submit -r pbs -n 2 -q short
pod-info -l  # wait until you see at least one slot (requested 2 slots)
root
# run the proof bench job as described here: 
# https://twiki.atlas-canada.ca/bin/view/AtlasCanada/ATLASLocalRootBase#Using_PROOF_on_Demand_PoD
# TProofBench pb("pod://")
# (etc)
# exit root
pod-server stop
</code>

===== Changes needed for the Cloud =====

The default setup makes the PoD work area in /home. This won't work on the Cloud, as /home isn't mounted on the worker nodes.

Changes are needed to ~/.PoD/PoD.cfg

<code>
work_dir=/data/$USER/.PoD
sandbox_dir=/data/$USER/.PoD
logfile_dir=/data/$USER/.PoD/log
</code>