Showering does not work when running with nb_core=1
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
MadGraph5_aMC@NLO |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
Hi,
When showering with Pythia8 with just one core, showering fails. The error one gets is
Pythia8 cross-section could not be retreived.
Try turning parallelization off by setting the option nb_core to 1.
The given message doesn't make sense, since I am actually running on a single core. Strangely, the problem only arises when working with only one core, with generate_events --nb_core=1. Using generate_events --nb_core=2 fixes the issue (unfortunately, when running on clusters, system administrators usually ask you to avoid multi-threaded code, so in those cases using nb_core=2 would not help). The problem may be that the file unweighted_
Further information:
Options are set in mg5 with
set run_mode 2
set nb_core 1
save options
Events are being run with madevent:
generate_events runname --nb_core=1
shower=PYTHIA8
Technical details:
Running madgraph 2.6.0
Pythia8
Python 2.7.13
gcc (GCC) 6.2.0
I attach the MG5 output file
Thanks!
Daniel
description: | updated |
Changed in mg5amcnlo: | |
status: | New → Fix Released |
Thanks Daniel, I will take a look probably tommorow or on Wednesday.
Cheers,
Olivier
> On 11 Sep 2017, at 18:56, Daniel Egana-Ugrinovic <email address hidden> wrote: events. lhe is not being compressed into a gzip file events. lhe.gz. Since run_shower.sh seems to need a gzipped yL_0.5_ DM_2.0_ MFc_60. 0_Mphi_ 110.0_run0" /bugs.launchpad .net/bugs/ 1716425/ +attachment/ 4948030/ +files/ MG5outputrun_ yL_0.5_ DM_2.0_ MFc_60. 0_Mphi_ 110.0_run0 /bugs.launchpad .net/bugs/ 1716425
>
> Public bug reported:
>
> Hi,
>
> When showering with Pythia8 with just one core, showering fails. The
> error one gets is
>
> Pythia8 cross-section could not be retreived.
> Try turning parallelization off by setting the option nb_core to 1.
>
> The given message doesn't make sense, since I am actually running on a
> single core. Strangely, the problem only arises when working with only
> one core, with generate_events --nb_core=1. Using generate_events
> --nb_core=2 fixes the issue (unfortunately, when running on clusters,
> system administrators usually ask you to avoid multi-threaded code, so
> in those cases using nb_core=2 would not help). The problem may be that
> the file unweighted_
> unweighted_
> lhe file, showering fails.
>
> Further information:
> Options are set in mg5 with
> set run_mode 2
> set nb_core 1
> save options
>
> Events are being run with madevent:
> generate_events runname --nb_core=1
> shower=PYTHIA8
>
> Technical details:
> Running madgraph 2.6.0
> Pythia8
> Python 2.7.13
> gcc (GCC) 6.2.0
>
> I attach the MG5 output file
>
> Thanks!
>
> Daniel
>
> ** Affects: mg5amcnlo
> Importance: Undecided
> Status: New
>
> ** Attachment added: "MG5outputrun_
> https:/
>
> ** Description changed:
>
> Hi,
>
> When showering with Pythia8 with just one core, showering fails. The
> error one gets is
>
> Pythia8 cross-section could not be retreived.
> Try turning parallelization off by setting the option nb_core to 1.
>
> - The given message doesn't make sense, since I am actually running on
> - single core mode. Strangely, the problem only arises when working with
> - only one core, with generate_events --nb_core=1. Using generate_events
> + The given message doesn't make sense, since I am actually running on a
> + single core. Strangely, the problem only arises when working with only
> + one core, with generate_events --nb_core=1. Using generate_events
> --nb_core=2 fixes the issue (unfortunately, when running on clusters,
> system administrators usually ask you to avoid multi-threaded code, so
> in those cases using nb_core=2 would not help).
>
> Further information:
> Options are set in mg5 with
> set run_mode 2
> set nb_core 1
> save options
>
> Events are being run with madevent:
> generate_events runname --nb_core=1
> - shower=PYTHIA8
> + shower=PYTHIA8
>
> Technical details:
> Running madgraph 2.6.0
> Pythia8
> Python 2.7.13
> gcc (GCC) 6.2.0
>
> I attach the MG5 output file
>
> Thanks!
>
> Daniel
>
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> Title:
> Showering does not work when running with nb_core=1
>
> Status in MadGraph5_aMC@NLO:
>...