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Opened 4 years ago

Last modified 4 years ago

#1458 new How to

Speed up pileup simulation

Reported by: adiluca Owned by:
Priority: minor Milestone:
Component: Delphes code Version: Delphes 3
Keywords: Cc:

Description

Hi Delphes developers,
We would like to produce large samples of pp collision containing pileup in HL-LHC condition. To do that we use DelphesPythia8 with delphes_card_ATLAS_PileUp card. As expected the simulation time increases. It took 396s per 100 events with pileup card and 6s per 100 events without pileup. Is there any way to reduce the simulation time?

Thanks a lot for you support.

Change History (2)

comment:1 by Michele Selvaggi, 4 years ago

It is not the PU simulation per se that is slow, it is the reconstruction, jet clustering in particular. If you do not need jets you can remove jet clustering from the card.

comment:2 by adiluca, 4 years ago

Thanks a lot for fast reply.
Unfortunately, we're particularly interested in reconstructed jet. We were thinking to launch multiple simulation in parallel, changing Pythia8 random seed. But we are not sure this could be a solution.
I saw that Delphes is very used among for FCC studies. Do you have any feedback/solution from them on they deal with this?

Thanks again.

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