Running pythia8 in madgraph nlo mode

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Hi

Sorry to look at this only now.
On which os are your running?
As far as i have looked, the problem is related to your OS where boost decide to not create that specific library at install time.

It is probably since you do not need it, but I need to create a VM with your exact OS in order to try to reproduce this and investigate who decide to add that line "-lboost_iostreams" inside the makefile (I'm worry that this is a decision of pythia8 and that I can not do anything about it, except complain to py8 autor)

Cheers,

Olivier

Hi Olivier,

I am working in an Ubuntu machine. Can you please check?

Thank you.

Can you be more specific (which version of Ubuntu)

Olivier

Ubuntu 16.04

On Wed, 31 Oct 2018, 14:42 Olivier Mattelaer, <
<email address hidden>> wrote:

> Your question #674984 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/674984
>
> Status: Open => Answered
>
> Olivier Mattelaer proposed the following answer:
> Can you be more specific (which version of Ubuntu)
>
> Olivier
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/mg5amcnlo/+question/674984/+confirm?answer_id=3
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
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> You received this question notification because you asked the question.
>

Thanks,

I'm lucky I have installed such VM recently for a lecture that I'm giving this afternoon.
I do not want to mess with this VM before my lecture, so I will take a look tomorow (or tonight)

vagrant@vagrant:~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.3 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.3 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

Cheers,

Olivier

Ok thanks Olivier.

On Wed, 31 Oct 2018, 14:57 Olivier Mattelaer, <
<email address hidden>> wrote:

> Your question #674984 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/674984
>
> Olivier Mattelaer posted a new comment:
> Thanks,
>
> I'm lucky I have installed such VM recently for a lecture that I'm giving
> this afternoon.
> I do not want to mess with this VM before my lecture, so I will take a
> look tomorow (or tonight)
>
> vagrant@vagrant:~$ cat /etc/os-release
> NAME="Ubuntu"
> VERSION="16.04.3 LTS (Xenial Xerus)"
> ID=ubuntu
> ID_LIKE=debian
> PRETTY_NAME="Ubuntu 16.04.3 LTS"
> VERSION_ID="16.04"
> HOME_URL="http://www.ubuntu.com/"
> SUPPORT_URL="http://help.ubuntu.com/"
> BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
> VERSION_CODENAME=xenial
> UBUNTU_CODENAME=xenial
>
> Cheers,
>
> Olivier
>
> --
> You received this question notification because you asked the question.
>

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Hi,

Here is a work-around the pythia8 bug. It will be include in 2.6.5 (but if py8 author corrects that bug themself)

Cheers,

Olivier

=== modified file 'madgraph/interface/common_run_interface.py'
--- madgraph/interface/common_run_interface.py 2018-11-15 22:48:20 +0000
+++ madgraph/interface/common_run_interface.py 2018-11-16 13:25:13 +0000
@@ -5808,15 +5846,21 @@
                 supports_HEPMCHACK = '-DHEPMC2HACK' in stdout

                 #3. ensure that those flag are in the shower card
- for l in libs:
- if l not in extralibs:
- modify_extralibs = True
- extralibs.append(l)
                 for L in paths:
                     if L not in extrapaths:
                         modify_extrapaths = True
                         extrapaths.append(L)
-
+ for l in libs:
+ if l == 'boost_iostreams':
+ #this one is problematic handles it.
+ for L in paths + extrapaths:
+ if misc.glob('*boost_iostreams*', L):
+ break
+ else:
+ continue
+ if l not in extralibs:
+ modify_extralibs = True
+ extralibs.append(l)
             # Apply the required modification
             if modify_extralibs:
                 if extralibs: