r5 - 22 Mar 2010 - 13:57:08 - RichardMountYou are here: TWiki >  AtlasSoftware Web > RegionalProductionV01

RegionalProductionV01 - US Regional Production: Summary of ATLAS Policy and US Practice

RAC summary of ATLAS policy.

The “ATLAS Policy leading to approval of Physics results” https://twiki.cern.ch/twiki/pub/AtlasProtected/AtlasPolicyDocuments/Physics_Policy.pdf lays out the conditions of validity for both ATLAS-wide and Private Monte-Carlo production. The flavor (read the policy for the details) of the policy is:

  • Private productions that increase the size of existing samples:
    • the relevant analysis group must (be persuaded to) make sure that checks are made on a small subset of the data and validation plots are reproduced.
  • Private production using new parameters and software:
    • after appropriate testing,
    • secure the approval of the relevant analysis group for the parameters/software,
    • secure the tagging of the parameters/software in the ATLAS software distribution,
    • perform full validation of a small sample made using the ATLAS production system,
    • Increase the sample size as above.
  • All privately produced samples can only be considered valid if they are accessible to the entire Collaboration.

US ATLAS approach:

Regional production is considered to be private production as far as ATLAS is concerned. The US ATLAS Operations team may use unpledged CPU resources, or unused pledged CPU resources, for US regional production. The initial priority for access to CPU resources will be (1=high):

Production Category Pledged CPU Unused Pledged CPU Unpledged CPU
ATLAS-wide 1   2
US-regional following ATLAS policy for validation   3 3
Other US regional   4 4
The relative priorities of ATLAS-wide and US-regional access to unpledged CPU resources may be adjusted in consultation with the US ATLAS physics community and the resource owners. Priorities within a US-regional production category will be adjusted in consultation with the US ATLAS physics community.

Disk space may also limit US regional production:

  • Use of pledged US diskspace may be possible subject to ATLAS agreement:
    • Current practice is for ATLAS to agree to US requests to free up pledged US disk space, for example by reducing the level of ESD or AOD replication in the US;
    • In the future, strong ATLAS analysis group support for the US regional production is likely to be a key to making disk space available.
  • Use of private diskspace removes most of the disk space issues, but unless the datasets will be accessible to all ATLAS, the production would be treated as lowest priority.

What is the Difference between ATLAS-wide Production and a valid US-Regional Production?

Very little! The RAC encourages following the ATLAS validation requirements. This should, in principle, allow the production to run either as ATLAS-wide or as US-Regional with exactly the same validlity. Nevertheless, US ATLAS has a strong interest in seeing all of its facilities effectively used and demonstrating that, while fully meeting the spirit and the letter of pledges, the facilities are also helping to make the US ATLAS community competitive!

Making the created datasets valid for ATLAS results is very strongly encouraged. The approvals and validation steps are exactly the same for central ATLAS production and US Regional Production.

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