Add hepmcmerger

[kkauder]

Briefly, what does this PR introduce?

Add a package for https://github.com/eic/HEPMC_Merger

What kind of change does this PR introduce?

• Bug fix (issue #__)
• New feature (issue #__)
• Documentation update
• Other: __

Please check if this PR fulfills the following:

• Tests for the changes have been added
• Documentation has been added / updated
• Changes have been communicated to collaborators

Does this PR introduce breaking changes? What changes might users need to make to their code?

No

Does this PR change default behavior?

No

[wdconinc]

Did you test that this actually works? Maybe you didn't submit all changes to this PR since you define cmake_args without defining this package as a CMakePackage.

[kkauder]

I couldn't test it, can you tell me how? This is something assembed from looking at existing packages but I'm flying blind

[wdconinc]

I couldn't test it, can you tell me how? This is something assembed from looking at existing packages but I'm flying blind

You can do something like:

docker run --rm -it spack/ubuntu-noble:0.21.0
git clone https://github.com/eic/eic-spack
git -C eic-spack checkout <branch>
spack repo add eic-spack
spack install <pkg>

(This could have typos, on my phone.)

[kkauder]

After chewing on this command for three hours, it just failed with the unrelated

 >> 9686    FAILED: tools/clang/lib/ASTMatchers/Dynamic/CMakeFiles/obj.clangDynamicASTMatchers.dir/Re
             gistry.cpp.o
     9687    /opt/spack/lib/spack/env/gcc/g++ -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_M

Is there anything else I can do?

[wdconinc]

Is there anything else I can do?

Not in this PR, apparently. Can you copy the full error message (with more than 'FAILED') and file it on spack?

[wdconinc]

Is there anything else I can do?

Not in this PR, apparently. Can you copy the full error message (with more than 'FAILED') and file it on spack?

And tag me in the issue on spack.

[kkauder]

I undid the f-string. It didn't work and this syntax is literally the same throughout the repo according to grep -r DCMAKE_CXX_STANDARD

[wdconinc]

Use single quotes inside the f-string arguments.

[wdconinc]

See last two examples in https://peps.python.org/pep-0498/#escape-sequences for correct f-string syntax.

[kkauder]

Thanks for all the help, @wdconinc ! Is the fact that the checks pass good enough to try including it in eic-shell?

[wdconinc]

Not at all. The checks don't do anything ;-)

[wdconinc]

Works

$ SignalBackgroundMerger 
==================================================================
=== EPIC HEPMC MERGER ===
authors: Benjamen Sterwerf* ([email protected]), Kolja Kauder** ([email protected]), Reynier Cruz-Torres***
* University of California, Berkeley
** Brookhaven National Laboratory
*** formerly Lawrence Berkeley National Laboratory

For more information, run 
./signal_background_merger --help
Number of Slices:10000
Signal events file and frequency:
        - root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/SIDIS/pythia6-eic/1.0.0/10x100/q2_0to1/pythia_ep_noradcor_10x100_q2_0.000000001_1.0_run1.ab.hepmc3.tree.root    (one event per time slice)

Background files and their respective frequencies:
        - root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/BACKGROUNDS/BEAMGAS/proton/pythia8.306-1.0/100GeV/pythia8.306-1.0_ProtonBeamGas_100GeV_run082.hepmc3.tree.root  31.900000 kHz
        - root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/BACKGROUNDS/BEAMGAS/electron/beam_gas_ep_10GeV_foam_emin10keV_30Mevt.hepmc3.tree.root   3177.250000 kHz
Writing to bgmerged.hepmc3.tree.root
Prepping root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/SIDIS/pythia6-eic/1.0.0/10x100/q2_0to1/pythia_ep_noradcor_10x100_q2_0.000000001_1.0_run1.ab.hepmc3.tree.root
Prepping root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/BACKGROUNDS/BEAMGAS/proton/pythia8.306-1.0/100GeV/pythia8.306-1.0_ProtonBeamGas_100GeV_run082.hepmc3.tree.root
Prepping root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/BACKGROUNDS/BEAMGAS/electron/beam_gas_ep_10GeV_foam_emin10keV_30Mevt.hepmc3.tree.root
Initiation time: 8 sec

==================================================================

Working on slice 1
Current memory usage: 366 MB
Working on slice 101
Current memory usage: 399 MB
Working on slice 201
Current memory usage: 456 MB
<snip>
Current memory usage: 486 MB
Working on slice 9801
Current memory usage: 486 MB
Working on slice 9901
Current memory usage: 486 MB
Finished all requested slices.
Slice loop time: 0 min
 -- 1919 us / slice
From root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/BACKGROUNDS/BEAMGAS/electron/beam_gas_ep_10GeV_foam_emin10keV_30Mevt.hepmc3.tree.root
  placed 63568 events
  --> on average 6
  placed 127136 final state particles
  --> on average 12
From root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/BACKGROUNDS/BEAMGAS/proton/pythia8.306-1.0/100GeV/pythia8.306-1.0_ProtonBeamGas_100GeV_run082.hepmc3.tree.root
  placed 655 events
  --> on average 0
  placed 8816 final state particles
  --> on average 0
From root://dtn-eic.jlab.org//work/eic2/EPIC/EVGEN/SIDIS/pythia6-eic/1.0.0/10x100/q2_0to1/pythia_ep_noradcor_10x100_q2_0.000000001_1.0_run1.ab.hepmc3.tree.root
  placed 10000 events
  --> on average 1
  placed 133302 final state particles
  --> on average 13

Maximum Resident Memory 486.938 MB

==================================================================
Overall running time: 0 min