MadGraph5_aMC@NLO

pythia8 works very slow compared to pythia6. Is this normal?

Asked by sonus

Hello,

mg5 + pythia6 -> run 01 takes 5-6 minutes (10000 events)
mg5 + pythia8 -> run01 takes 20-25 minutes (10000 events)

Is this normal?
if it's not normal is there a solution to make it faster?

Thank you.

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

You can use the command (when asked to edit the question)
set mpi False
which will setup the pyhtia8_card to avoid the inclusion of the MPI.
This part of the computation is slowing down py8 by a lot (and this was not include by default for PY6)

Cheers,

Olivier

> On Nov 10, 2017, at 10:16, sonus <email address hidden> wrote:
>
> New question #660563 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/660563
>
> Hello,
>
> mg5 + pythia6 -> run 01 takes 5-6 minutes (10000 events)
> mg5 + pythia6 -> run01 takes 20-25 minutes (10000 events)
>
> Is this normal?
> if it's not normal is there a solution to make it faster?
>
> Thank you.
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
sonus (sonus) said : 		#2

Thanks Olivier Mattelaer, that solved my question.

Revision history for this message
sonus (sonus) said : 		#3

Thank you so much!
Great! Now, it works very fast.