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Lab setup of software: Geant4

Step-by-step instructions for setting up Geant4 software on various operating systems, including requirements, installation process, environment variables setup, and running simulations with multithreading, command line usage, and cluster configurations.

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Lab setup of software: Geant4

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  1. Lab setup of software: Geant4 José A. Ramos Méndez, PhD. University of California San Francisco

  2. Requirements • The requirements vary from one OS system to others. But essentially one needs (either main package and developer libraries): • C++ and GLIBC • CMAKE • OpenGL • X11 libraries • EXPAT • Debian-based • apt-get install expat-dev • RedHat-based • yum install expat-devel • OSX • port install expat FCFM-BUAP, Puebla, Pue.

  3. geant4.web.cern.ch FCFM-BUAP, Puebla, Pue.

  4. Installation • Create a directory named Geant4 in your home directory. • Uncompress Geant4 and the DATA files downloaded from the webpage • Create the directories: Geant4/geant4-build and Geant4/geant4-install • Inside Geant4/geant4-build do the follow: cmake ../geant4.xxx.xxx -DGEANT4_BUILD_MULTITHREADED=ON -DGEANT4_USE_OPENGL_X11=ON -DGEANT4_USE_RAYTRACER_X11=ON -DEXPAT_LIBRARY=/usr/lib/libexpat.so -DGEANT4_INSTALL_DATA=OFF -DCMAKE_INSTALL_PREFIX=../geant4-install • Then: make -jN where N is the number of CPUs in your PC • Finally make install FCFM-BUAP, Puebla, Pue.

  5. Installation • Setup the environment variables: • For example if your Geant4 is at your $HOME/Geant4, then export GEANT4=$HOME/Geant4 export Geant4_DIR=$GEANT4/geant4-install export G4LEDATA=$GEANT4/G4EMLOW6.41 export G4NEUTRONHPDATA=$GEANT4/G4NDL4.5 export G4SAIDXSDATA=$GEANT4/G4SAIDDATA1.1 export G4NEUTRONXSDATA=$GEANT4/G4NEUTRONXS1.4 export G4LEVELGAMMADATA=$GEANT4/PhotonEvaporation3.1 export G4RADIOACTIVEDATA=$GEANT4/RadioactiveDecay4.2 • Add those lines to ~/.bashrc; ~/.bash_profile FCFM-BUAP, Puebla, Pue.

  6. Running • user@user$ cd $GEANT4/geant4.xxx.xxx • user@user$ cd examples/basic/B1 • user@user$ mkdir build • user@user$ cd build • user@user$ cmake ../ • user@user$ make -jN • user@user$ ./exampleB1 run1.mac • user@user$ ./exampleB1 FCFM-BUAP, Puebla, Pue.

  7. The command line and parallelism FCFM-BUAP, Puebla, Pue.

  8. Running • Let’s start with the example Geant4/basic/B1 • user@user:$ ./exampleB1 • Idle> /run/beamOn 10 • Like-Unix commands. Do not use in a macro. • cd, pwd - jump to a command directory and shows the path, respectively • ls - all available commands • history - used commands • ?UICommand- shows the parameter of command UICommand • helpUICommand - Provide detailed help, navigate it through keyboard • exit - Finalize simulation FCFM-BUAP, Puebla, Pue.

  9. Multithreading • In exampleB1.cc add G4cout << “##### “ << G4Threading::GetNumberOfCores() << “ ####” << G4endl; • rebuild and execute. Then you can set /run/numberOfThreads 4 Or runManger->SetNumberOfThreads( G4Threading::GetNumberOfCores() ); FCFM-BUAP, Puebla, Pue.

  10. Cluster • Let’s play with the random generation seed. • In exampleB1.cc G4int myseed = G4UIcommand::ConvertToInt(argv[2]); G4Random::setTheSeed(mySeed); • Rebuild and execute for different seeds ./exampleB1 run1.mac 2324 • Everyone pick a ID number, we will use in each simulation. FCFM-BUAP, Puebla, Pue.

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