Tim Adye - RAL Ganga 1

Ganga ExperiencesGanga Experiences

Tim Adye

Rutherford Appleton Laboratory

ATLAS RAL Physics Meeting

26th February 2008

Tim Adye - RAL Ganga 2

Summary of my (lack of) Ganga experience• I made my first attempt at using Ganga two weeks ago

• previously just watched others or used EDG/LCG commands• Installed Ganga 4.4.7 on PPD machines

• Version 4.4.8 released last week

• Ganga seems to have all the functionality I would want – but I was disappointed by how cumbersome it is to use.• I sent Karl Harrison some detailed comments for discussion at

Today’s Ganga User Forum.

• I put some newbie instructions and notes here: https://twiki.cern.ch/twiki/bin/view/Sandbox/TimAdyeGangaNotes

Please do not publicise that page – it’s naïve and quite RAL-specific.

Tim Adye - RAL Ganga 3

Ganga options• Ganga has three user interfaces

1. Python command-line• Most documentation refers to this

• It really is very verbose• examples have ~10 commands to submit 1 job.

2. GUI• Easier to use

• Still quite a bit of interaction just to submit a job

• Run at RAL – too slow to use from lxplus over the network

3. Shell command-line• Submit a job with a single command

• Still need several options, but seemed clear to me

• Lots of printout (same as 1). Why not just “job 12 submitted”?

• I much prefer the shell interface• I used that for submission, but the GUI to monitor jobs and

retrieve output (not supported in shell interface?)

Tim Adye - RAL Ganga 4

Criticisms and problems

• Why no “bjobs” command?• No web monitoring tool like Panda

• GUI has the similar functionality, but you need to start it up• Would be nice to view logfiles from the web, rather than

downloading them and filling up home directory

• Release kit at RAL does not include Grid packages• AtlasLogin assumes it is there so removes local stuff from PATH• It is in CERN installation. Is kit installed correctly here?

• Could not yet get splitter to work• Could not yet get dq2_get to work on PPD machines

• Used Ganga GUI to retrieve output ROOT files• dq2_get worked at CERN – getting my output there was easy!

• More comments on my notes page...