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Multithreaded Pileup Digitization

Beojan Stanislaus requested to merge bstanisl/athena:mt-pileup-cpp into master

Multithreaded pileup digitization implementation

The multithreaded version is used if Digi_tf is given both the --CA option and AthenaMT is used.

Pileup merging is now done tool at a time, then bunch at a time. Unused background events from previous batches are reused in the next batch to be loaded, and batches must be loaded in order to ensure the same background events are in a given batch.

Edited by Beojan Stanislaus

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