MG5 and Pythia8

Asked by Sebastian Urrutia-Quiroga on 2018-08-26

Hi all,
I'm having some issues with Madgraph and Pythia. Concretely, I got the following message:

INFO: Running Pythia8 [arXiv:1410.3012]
No user-defined value for Pythia8 parameter 'JetMatching:nJetMax'. Setting it automatically to 1.
Follow Pythia8 shower by running the following command (in a separate terminal):
    tail -f /home/surrutia/madgraph/signal_e-e-2j/Events/run_01/tag_1_pythia8.log
Command "generate_events run_01" interrupted with error:
InvalidCmd : Pythia8 shower interrupted with return code 139.
        You can find more information in this log file:
        /home/surrutia/madgraph/signal_e-e-2j/Events/run_01/tag_1_pythia8.log

In the mentioned log file, I found the following message:

/home/surrutia/madgraph/signal_e-e-2j/Events/run_01/run_shower.sh: line 2: 29494 Segmentation fault (core dumped) LD_LIBRARY_PATH=/home/surrutia/madgraph/HEPTools/MG5aMC_PY8_interface/MG5aMC_PY8_interface tag_1_pythia8.cmd

I'm not sure if the problem lies on Madgraph, Pythia, or the interface between them, so any suggestion is welcome.

Thanks,
Sebastian

Question information

Language:
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MadGraph5_aMC@NLO Edit question
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Last query:
2018-08-26
Last reply:
2018-09-14

Should be on the Pythia side.

Cheers,

Olivier

> On 26 Aug 2018, at 05:08, Sebastian Urrutia-Quiroga <email address hidden> wrote:
>
> New question #672970 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/672970
>
> Hi all,
> I'm having some issues with Madgraph and Pythia. Concretely, I got the following message:
>
> INFO: Running Pythia8 [arXiv:1410.3012]
> No user-defined value for Pythia8 parameter 'JetMatching:nJetMax'. Setting it automatically to 1.
> Follow Pythia8 shower by running the following command (in a separate terminal):
> tail -f /home/surrutia/madgraph/signal_e-e-2j/Events/run_01/tag_1_pythia8.log
> Command "generate_events run_01" interrupted with error:
> InvalidCmd : Pythia8 shower interrupted with return code 139.
> You can find more information in this log file:
> /home/surrutia/madgraph/signal_e-e-2j/Events/run_01/tag_1_pythia8.log
>
> In the mentioned log file, I found the following message:
>
> /home/surrutia/madgraph/signal_e-e-2j/Events/run_01/run_shower.sh: line 2: 29494 Segmentation fault (core dumped) LD_LIBRARY_PATH=/home/surrutia/madgraph/HEPTools/MG5aMC_PY8_interface/MG5aMC_PY8_interface tag_1_pythia8.cmd
>
> I'm not sure if the problem lies on Madgraph, Pythia, or the interface between them, so any suggestion is welcome.
>
> Thanks,
> Sebastian
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi,
Thank you so much, I'll contact Pythia developers.

It's weird because I tried with another process in the SM,
   generate p p > t t~ j
   add process p p > t t~ j j

and it works, so I'm really confused.

Best,
Sebastian

This is a segfault in PY8, so it might be process dependent.

Cheers,

Olivier

> On 26 Aug 2018, at 22:43, Sebastian Urrutia-Quiroga <email address hidden> wrote:
>
> Question #672970 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/672970
>
> Sebastian Urrutia-Quiroga posted a new comment:
> Hi,
> Thank you so much, I'll contact Pythia developers.
>
> It's weird because I tried with another process in the SM,
> generate p p > t t~ j
> add process p p > t t~ j j
>
> and it works, so I'm really confused.
>
> Best,
> Sebastian
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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