Bug for VBS-like processes, with the low_mem_multicore_generation
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
MadGraph5_aMC@NLO |
Fix Released
|
Undecided
|
marco zaro |
Bug Description
Dear Authors,
I would like to generate the NLO QCD correction to the process of WWjj->lvlvjj.
What I did was:
generate p p > e+ ve mu- vm~ j j [QCD]
add process p p > mu+ vm e- ve~ j j [QCD]
Generating the FKS-subtracted matrix element for Born process is relatively quick, ±30mins, but it takes a few hours to generate the virtual matrix-elements using Madloop and this step worked fine and was complete. After this was complete I then ran,
output ppWWjj
The problem occurs when I try to create the corresponding output for MadGraph5_aMC@NLO.
The generation of matrix-elements in "output" ends at 88/240. Since it stops I have no log file to look at and resolve this issue. Also, there is no error.
I tried running the process on different machines with my colleagues and still, the output suddenly stops.
Note: I am using:
macOS Mojave Version 10.14
, MG5_aMC_v2_6_5,
GNU Fortran (GCC) 6.2.0
, Python 2.7.15
Any advice into the solution for this would be greatly appreciated.
Kind regards,
Lebohang.
Dear Lebohang, multicore_ nlo_generation mode is used.
first of all, apologies for the long silence on this.
We had time to investigate your issue, and it turned out that there is a bug related to the process combination when the low_mem_
I attach a patch that should solve that issue, it would be great if you could confirm that it does.
We are still studying the problem, and we will decide soon whether to apply the patch to the main release of MG5_aMC
Thanks again,
Best wishes,
Marco