Another way to fix your problem should be to set run_mode on 0 (single core) rather than 2 (multicore)
Cheers,
Olivier
> On 11 Sep 2017, at 19:10, Daniel Egana-Ugrinovic <email address hidden> wrote:
>
> ** 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 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).
> + in those cases using nb_core=2 would not help). The problem may be that
> + the file unweighted_events.lhe is not being compressed into a gzip file
> + unweighted_events.lhe.gz. Since run_shower.sh seems to need a gzipped
> + 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
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/1716425
>
> Title:
> Showering does not work when running with nb_core=1
>
> Status in MadGraph5_aMC@NLO:
> New
>
> 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_events.lhe is not being compressed into a
> gzip file unweighted_events.lhe.gz. Since run_shower.sh seems to need
> a gzipped 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
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mg5amcnlo/+bug/1716425/+subscriptions
Hi Daniel,
Ok looks like that such problem occur only for matched/merged sample. bazaar. launchpad. net/~mg5core2/ mg5amcnlo/ 2.6.1/diff/ 282?context= 3
I have just pushed a patch in the development version for such problem.
You can download the patch here:
http://
Another way to fix your problem should be to set run_mode on 0 (single core) rather than 2 (multicore)
Cheers,
Olivier
> On 11 Sep 2017, at 19:10, 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 /bugs.launchpad .net/bugs/ 1716425 events. lhe is not being compressed into a events. lhe.gz. Since run_shower.sh seems to need /bugs.launchpad .net/mg5amcnlo/ +bug/1716425/ +subscriptions
>
> ** 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 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).
> + 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
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https:/
>
> Title:
> Showering does not work when running with nb_core=1
>
> Status in MadGraph5_aMC@NLO:
> New
>
> 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_
> gzip file unweighted_
> a gzipped 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
>
> To manage notifications about this bug go to:
> https:/