MadGraph5_aMC@NLO

pythia8 cannot generate .hepmc on condor

Asked by yingpu xiahou

Hi,

I am trying to submit some .lhe files to condor and get the .hepmc in the end after running Pythia8. I am using the 2.19 version of Pythia8 . The .lhe file comes from MG5_2_5_2.

It is pretty interesting that I can run Pythia8_2_19 locally and get the .hepmc . However, if I submit the same .lhe to condor, the output of .hepmc is empty. I can guarantee that the .lhe that I submit to condor is not empty. I checked the .out file and I see that Pythia8 always get stuck here:

 -------- End LHA initialization information --------
 PYTHIA Abort from Pythia::next: reached end of Les Houches Events File
Info: end of input file reached

How can I overcome this?

Btw, not all .lhe file dies on condor, just some specific ones. However, all the .lhe file can survive after running Pythia8 locally and get the .hepmc in the end.

Thanks !
Yingpu

Question information

Language:
English Edit question
Status:
Needs information
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Valentin Hirschi Edit question
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Valentin Hirschi (valentin-hirschi) said : 		#1

We have recently fixed a similar issue in the development version v2.5.3, but it concerned multicore parallel PY8 runs.

For runs on high throughput types of clusters, there's a subtle issue that I explained in item b) of my following answer:

https://answers.launchpad.net/mg5amcnlo/+question/404194

Please be aware of that. However, I don't think this is a problem, but to be sure it would be nice if you could to confirm that you face the same problem when running the shower in multi-core "locally". You can do so by setting the MG5_aMC option 'run_mode' to '2' instead of '1' before launching the PY8 shower on your LO simulated events.

Now I believe that you will reproduce it and the fix we brought in v2.5.3 should work for you as well. You can try it out by pulling the development version with:

bzr branch lp:~maddevelopers/mg5amcnlo/2.5.3

We anyway plan on releasing that version soon.

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