Eic-smear and Generators with Singularity

The simplest way to use eic-smear and a wide range of HERA generators is to take advantage of cvmfs and singularity to be placed directly into the environment that’s running natively at BNL. This combination is widely available at national labs, CERN, and many other facilities, as long as $CVMFS_REPOSITORIES contains “eic.opensciencegrid.org”. But simple instructions for any system can be found below. Sometimes it may be necessary to activate singularity:

%  module load singularity

In all cases, a single line

%  singularity shell --writable -B /cvmfs:/cvmfs /cvmfs/eic.opensciencegrid.org/singularity/rhic_sl7_ext

and one setup script

% export EIC_LEVEL=dev
% source /cvmfs/eic.opensciencegrid.org/x8664_sl7/MCEG/releases/etc/eic_bash.sh

will place you in the same environment where the libraries are installed natively. All libraries and executables are in your $PATH and $LD_LIBRARY_PATH, and the full packages can be found under $EICDIRECTORY. That means you can directly copy and paste instructions from here and from the README’s of MCEG packages.

For example

% cp -r $EICDIRECTORY/PACKAGES/eic-smear/tests .
% cp $EICDIRECTORY/PACKAGES/eic-smear/scripts/smearHandBook.cxx .
% pythiaeRHIC < tests/input.data.ep_hiQ2.20x250.small.eic

will create pythia e+P output.

% root -l
root[] gSystem->Load("libeicsmear");
root[] BuildTree ("tests/ep_hiQ2.20x250.small.txt");
root[] .L smearHandBook.cxx
root[] SmearTree(BuildHandBookDetector(), "ep_hiQ2.20x250.small.root")

will smear the result. The documentation contains instructions on how to work with the result, and files in $EICDIRECTORY/PACKAGES/eic-smear/tests provide practical examples.

Also in the $EICDIRECTORY/PACKAGES and $EICDIRECTORY/bin are the generators BeAGLE, Milou, DJANGOH, RAPGAP, and PEPSI.

Of course, eic-smear and many MCEGs are also part of the escalate package. Instructions and examples on how to use it in conjunction with PYTHIA8, how to write your own eJana plugins, how to perform analyses within JupyterLab or on the command line and much more are part of the included tutorial, and the recording of the recent tutorial is (soon) in our YouTube channel.

Singularity+cvmfs at JLAB:

On your computer

ssh login.jlab.org

On login.jlab.org

ssh ifarm1802

ifarm1802.jlab.org

module load /apps/modulefiles/singularity/3.4.0

Singularity+cvmfs anywhere

You can also use the software on any computer that can run VirtualBox (i.e., Windows, OSX, Linux, even Solaris).

A ready-made image can be downloaded at [https://www.phenix.bnl.gov/WWW/publish/phnxbld/sPHENIX/Singularity/Fun4AllSingularityDistribution.ova]. Some more instructions at [https://github.com/eic/Singularity/blob/master/VirtualBox.md].

Note: All that’s needed is cvmfs, singularity, and eic.opensciencegrid.org in CVMFS_REPOSITORIES. The image just has this already done for you.

At BNL

No need for containers, just add

setenv EIC_LEVEL dev
source /cvmfs/eic.opensciencegrid.org/x8664_sl7/MCEG/releases/etc/eic_cshrc.csh

to your ~/.cshrc.

( Note that source /afs/rhic.bnl.gov/eic/restructured/etc/eic_cshrc.csh also works. But in the future we will probably switch completely to using the cvmfs mirror as the new standard location).

For more information on singularity, see Wouter’s [excellent introduction])(https://eic.github.io/software/escalate_singularity_1.html).