Require one event at a time

[sethrj]

Require one event at a time

[sethrj]

From @amandalund :

with our standalone app I’ve typically seen better performance transporting multiple events at a time (e.g. about ~2x faster for the cms2018+field+msc-vecgeom-gpu regression problem with merge_events=true ). Our regression suite merges events for celer-sim on the gpu, right? I don’t think I’ve run those problems in single-event mode in a while, but it would be good to compare. I’d still probably prefer to keep that capability.

My follow up:

fair enough! I think it'd also be good to run with a few more events (to reduce the load imbalance from each core having only a single event) and make sure that the merge_events=false case has optimal track slots