Meeting Date: 21/4/2017
Attendees: D. Abdurachmanov, M. Alef, L. Atzori, S. Baymani, A. Brosa, J. Flix, A. Forti, D. Giordano, D. Lange, A. McNab, M. Michelotto, M. Reis, A. Sciaba
1) News (from Domenico)
- no comments
2) Containers in Atlas (from Lukas)
- Benchmarking is a use-case for container adoption
- Provide reproducible, interactive development environments for personal development / software tutorials
- Images can have different sizes
- if cvmfs is already mounted on the host, the size of the image is rather small 2-3 GB
- otherwise it can be as large as 10 GB, it includes all LCG libraries
- sqlite condition file is another cause of large sizes.
- D.G. comment: the condition data needed for the KV (particle gun) should be rather small (to be checked with the Atlas condition team)
- image available lukasheinrich/athena_trfsbase
- Checkpoints are under study to further speed up the execution, having snapshotted the initialisation step
- Possibly ready for ACAT
- Prototype available for tests
- Athena 21.x comes with open source licence
- For Domenico: to try the Lukas' recipe to run KV with the usual athena version 17.x
3) Sandboxing CMSSW (from David)
- Attached documentation shows how docker images were created and used
- indeed this work done in the context of OpenLab was eventually not much used
- David prefers to use directly tools like proot and care ( https://github.com/proot-me/PRoot )
- see David documentation at http://davidlt.web.cern.ch/davidlt/vault/proot/
- sqlite file of conditions is big: 10 GB and is one of the contributors of the big size of the image.
- reason why adoption of squid caches is preferred.
- NB: this implies a configuration at server level (as in the case of cvmfs) that not necessary is available for servers in internal networks in the commissioning phase.
- To be checked with
- For David: to circulate a recipe to run a cmssw GEN-SIM workload (ttbar?), with the minimum amount of dependencies
- as a first step, still consider cvmfs as available.
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