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HltEventLoopMgr: add option to run algs/sequences during start

Merged HltEventLoopMgr: add option to run algs/sequences during start
fwinkl/athena:hltcondalgs into 22.0
Merged Frank Winklmeier requested to merge fwinkl/athena:hltcondalgs into 22.0
  1. Aug 09, 2022
    • Frank Winklmeier's avatar
      HltEventLoopMgr: add option to run algs/sequences during start · 053d8159
      Frank Winklmeier authored 
      Add the `execAtStart` property that can be used to specify a list of
algorithms/sequences that should be executed at the end of the
prepareForRun transition. This can e.g. be used to execute all CondAlgs
once before the first event to improve memory sharing:

ServiceMgr.HltEventLoopMgr.execAtStart = ['AthCondSeq']

Relates to ATR-26138.
      053d8159