MadGraph5_aMC@NLO

Madgraph-Pythia interface

Asked by Sebastian Urrutia-Quiroga

Hello everyone,

I'm installing the latest version of Madgraph in my institution's cluster and apparently there was no error. However, testing the chain MG5-Pythia8-Delphes for a simple process (to check everything is working), I got the following message:

Command "generate_events run_01" interrupted with error:
error : can't start new thread
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in '/home/su64a/MG5/TestCluster/run_01_tag_1_debug.log'.
Please attach this file to your report.

I've checked the mentioned file but there is no mention to the source of the error.

Any idea would be really appreciated, thanks!
Sebastian

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MadGraph5_aMC@NLO Edit question
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Solved by:
Olivier Mattelaer
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

This typically happens when you do a scan or similar stuff.
It might also be an issue on some machine with very strict limit on the number of thread (in that case contact your sys-admin in order to use the cluster rather than a single machine)

Cheers,

Olivier

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Sebastian Urrutia-Quiroga (sgurruti) said : 		#2

Hi Olivier,

Thank you for your prompt response. I was able to fix that with my sys-admin but now I'm getting the following error message:

Error detected in sub-command generate_events
write debug file /home/su64a/MG5/TestCluster/run_02_tag_1_debug.log
If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
MadGraph5Error : A compilation Error occurs when trying to compile /home/su64a/MG5/TestCluster/SubProcesses/P1_qq_ll.
The compilation fails with the following output message:
    gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -w -c symmetry.f -I../../Source/
    gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -w -c idenparts.f -I../../Source/
    gfortran -o gensym symmetry.o idenparts.o -L../../lib/ -lmodel -lgeneric -lpdf -lstdc++
    ../../lib//libpdf.a(pdfwrap.o): In function `pdfwrap_':
    pdfwrap.f:(.text+0x3e2): undefined reference to `_gfortran_stop_numeric_f08'
    collect2: error: ld returned 1 exit status
    make: *** [gensym] Error 1

Any thoughts?

Thanks again,
Sebastian

Revision history for this message
Best Olivier Mattelaer (olivier-mattelaer) said : 		#3

HI,

This is the type of error message which happens when you mix two compiler.
My suggestion is to go to the Source directory:
 /home/su64a/MG5/TestCluster/Source
and run the command
make clean
make

then I guess it should work.

Cheers,

Olivier

Revision history for this message
Sebastian Urrutia-Quiroga (sgurruti) said : 		#4

Thanks Olivier Mattelaer, that solved my question.