Using GANGA with AMAAthena

Introduction

This document gives an step-by-step instruction for running AMAAthena within GANGA on a NIKHEF desktop (e.g. ribble). AMAAthena is a Athena package providing ... developed at NIKHEF. GANGA is an official ATLAS grid utility for distributed data analysis.

The examples below assume that:

Users have the following Athena job option files in the run directory of the AMAAthena package
AMAAthena_jobOptions.py
Trigger_jobOptions.py
Users have the following AMA driver configuration files in the run directory of the AMAAthena package
exampleaod.conf
reader.conf
Analysis is performed on an ATLAS dataset: fdr08_run2.0052280.physics_Muon.merge.AOD.o3_f8_m10

Preparation

1. follow the CMT instructions to setup your CMTHOME directory
2. checkout the AMAAthena package from CVS
3. make sure you will start GANGA with a clear environment without any Athena and CMT setup

Starting GANGA

Typing the following commands within the directory: PhysicsAnalysis/AnalysisCommon/AMA/AMAAthena/cmt

% source /project/atlas/nikhef/dq2/dq2_setup.sh.NIKHEF
% export DPNS_HOST=tbn18.nikhef.nl
% export LFC_HOST=lfc-atlas.grid.sara.nl
% source /project/atlas/nikhef/ganga/etc/setup.[c]sh
% ganga --config-path=/project/atlas/nikhef/ganga/config/Atlas.ini.nikhef

GANGA magic functions for cmtsetup

Inside GANGA, one could deal with the complex CMT setup with two magic functions.

The following example shows how to setup the CMT environment for Athena 14.2.0 in 32 bit mode.

In [n]: config.Athena.CMTHOME = '/your/cmthome'
In [n]: cmtsetup 14.2.0,32
In [n]: setup

Running AMAAthena in GANGA

Creating new GANGA job

In [n]: j = Job()

Setting application

In [n]: j.application = AMAAthena()
In [n]: j.application.option_files += [ File('../run/AMAAthena_jobOptions.py'), File('../run/Trigger_jobOptions.py') ]
In [n]: j.application.driver_config.config_file = File('../run/exampleaod.conf')
In [n]: j.application.driver_config.include_file += [ File('../run/reader.conf') ]
In [n]: j.application.prepare()

Setting input datasets

StagerDataset When using the StagerDataset, the AMAAthena job will use the Athena FileStager to copy dataset files from a grid storage.

In [n]: j.inputdata = StagerDataset()
In [n]: j.inputdata.dataset += [ 'fdr08_run2.0052280.physics_Muon.merge.AOD.o3_f8_m10' ]

DQ2Dataset When using the DQ2Dataset, GANGA will handle the dataset file access externally from Athena.

In [n]: j.inputdata = DQ2Dataset()
In [n]: j.inputdata.dataset += [ 'fdr08_run2.0052280.physics_Muon.merge.AOD.o3_f8_m10' ]
In [n]: j.inputdata.type = 'DQ2_DOWNLOAD'

Setting job splitter (optional)

The examples below ask each subjob to process on 2 files in maximum.

using StagerJobSplitter with StagerDataset

In [n]: j.splitter = StagerJobSplitter()
In [n]: j.splitter.numfiles = 2

using DQ2JobSplitter with DQ2Dataset

In [n]: j.splitter = DQ2JobSplitter()
In [n]: j.splitter.numfiles = 2

Setting computing backend

using Stoomboot cluster

In [n]: j.backend = PBS()

using LCG

In [n]: j.backend = LCG()

Submitting job

In [n]: j.submit()

Known issues/ToDo items

StagerDataset not supported for jobs on LCG