Slightly improved I/O for the McEventCollectionCnv

Andrii Verbytskyirequested to merge
averbyts/athena:faster_IO into main

Slightly improved I/O for the McEventCollectionCnv

  • Use the internal hepMC3 mechanisms for the serialization of the GenRunInfo. This will avoid some locks.

@pclark @jchapman

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