Ganga Experiences Tim Adye Rutherford Appleton Laboratory ATLAS

Ganga Experiences Tim Adye Rutherford Appleton Laboratory ATLAS RAL Physics Meeting 26 th February 2008 Tim Adye - RAL Ganga 1

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/Tim. Adye. Ganga. Notes Please do not publicise that page – it’s naïve and quite RAL-specific. Tim Adye - RAL Ganga 2

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 3

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 • Atlas. Login 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 dq 2_get to work on PPD machines • Used Ganga GUI to retrieve output ROOT files • dq 2_get worked at CERN – getting my output there was easy! • More comments on my notes page. . . Tim Adye - RAL Ganga 4