Comment 2 for bug 1674341

Could you try reshowering your events with Pythia8 but turning off the
parallelization handled by MG5aMC. You can do so with

./bin/mg5
launch ~/mgoutput2/zjj_matched_MG253 -i
set nb_core 1
shower pythia8 run_01 -f

Make sure that no multiple jobs are created this time. Let me know if it
works or if you face a similar error again (in which case it would be good
to attach the corresponding PY8 log file again).

On Mon, Mar 20, 2017 at 2:52 PM, Olivier Mattelaer <
<email address hidden>> wrote:

> ** Changed in: mg5amcnlo
> Assignee: (unassigned) => Valentin Hirschi (valentin-hirschi)
>
> --
> You received this bug notification because you are a bug assignee.
> https://bugs.launchpad.net/bugs/1674341
>
> Title:
> Pythia8 shower failed since it did not accept any event from the
> MG5aMC event file
>
> Status in MadGraph5_aMC@NLO:
> New
>
> Bug description:
> Hi,
>
> I'm trying to generate a matched jet sample using pythia8 and MG
> 2.5.3, but I'm getting the following error:
>
> Command "generate_events run_01" interrupted with error:
> InvalidCmd : Pythia8 shower failed since it did not accept any event
> from the MG5aMC event file.
>
> I'm doing the following for the generation:
>
> generate p p > z, z > e+ e- @0
> add process p p > z j, z > e+ e- @1
> add process p p > z j j, z > e+ e- @2
> output ~/mgoutput2/zjj_matched_MG253
> launch
> shower=pythia8
> detector=delphes
> set run_card ickkw 1
> set run_card auto_ptj_mjj True
> set run_card xqcut 20
> set pythia8_card JetMatching:qCut 30
>
> The same process with MG 2.3.3 and pythia 6 works fine.
>
> I'm attaching the end of one of the log files
> (Events/run_01/PY8_parallelization/split_0/PY8_log.txt). If I don't do
> matching, the showering with pythia8 is working fine.
>
> Thanks in advance,
>
>
> Nicolas.
>
> To manage notifications about this bug go to:
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>

--
Valentin