Number of cores to generate LHE file

Hi,

Do you have multiple version of PY8 installed on your machine?
This can creates issues like that one.
If you are using merging then the "guess" for the born is not always working and can also lead to such issue/
Other isue are also possible

Can you check the py8 log file and report the issue?

Cheers,

Olivier

> On 2 Apr 2020, at 19:22, Muhammad Danish Aslam <email address hidden> wrote:
>
> New question #689664 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/689664
>
> I am using Madgraph v2.7.2 for generating LHE file. I got following error;
>
> INFO: Running Pythia8 [arXiv:1410.3012]
> Splitting .lhe event file for PY8 parallelization...
> Submitting Pythia8 jobs...
> Pythia8 shower jobs: 0 Idle, 4 Running, 0 Done [48 seconds]
> Pythia8 shower jobs: 0 Idle, 2 Running, 2 Done [48 seconds]
> Pythia8 shower jobs: 0 Idle, 1 Running, 3 Done [48 seconds]
> Pythia8 shower jobs: 0 Idle, 0 Running, 4 Done [48 seconds]
> Merging results from the split PY8 runs...
> Error detected in "generate_events run_01"
> write debug file /home/danish/compiler/analysis/MG5_aMC_v2_7_2/eeTozhh/run_01_tag_1_debug.log
> If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
> MadGraph5Error : Histogram with run_id '0' was not found in the specified XML source.
> quit
> INFO: storing files of previous run
> INFO: Done
>
>
> Then i find a solution in previously asked question i.e set nb_core =1. I used it it works. But it very slows down progress. It take too much hours for generating LHE file. Kindly suggest me how can i improve my progress? I am using 4 cores processor.
>
> --
> You received this question notification because you are an answer
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 PYTHIA Abort from Pythia::Pythia: unmatched version numbers : in code 8.244 but in XML 8.243

Start generating events

Inclusive cross section: 0.00000000e+00 +- 0.00000000e+00 mb

Thanks Olivier Mattelaer, that solved my question.