MadGraph5_aMC@NLO

What is the maximal number of events in Pythia?

Asked by Maksym Ovchynnikov

In run_card is written that when running pythia we must avoid more than 50000 events in a run. What is a problem with this?

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

I guess I can remove such warning now.

The problem was that the stdhep output is a binary format which was based on 32bit. The total file size was therefore limited to 2Gb. Which was easily reached for 100k samples.
File larger than 2Gb was als sometimes problematic on 32 bit machine (for the same reason).

Now that all computer are basically 64 bit, that a version of the stdhep format was extended to 64 bit and that we anyway use pythia8 (and therefore hepmc format), it is indeed appropriate to remove such mention in the card.

Thanks,

Olivier

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