Lab setup of software: Geant4
José A. Ramos Méndez, PhD.
University of California San Francisco
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
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geant4.web.cern.ch
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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
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Installation
• Setup the environment variables:
• For example if your Geant4 is at your $HOME/Geant4, then
export
export
export
export
export
export
export
export
GEANT4=$HOME/Geant4
Geant4_DIR=$GEANT4/geant4-install
G4LEDATA=$GEANT4/G4EMLOW6.41
G4NEUTRONHPDATA=$GEANT4/G4NDL4.5
G4SAIDXSDATA=$GEANT4/G4SAIDDATA1.1
G4NEUTRONXSDATA=$GEANT4/G4NEUTRONXS1.4
G4LEVELGAMMADATA=$GEANT4/PhotonEvaporation3.1
G4RADIOACTIVEDATA=$GEANT4/RadioactiveDecay4.2
• Add those lines to ~/.bashrc; ~/.bash_profile
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Running
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user@user$ 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
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THE COMMAND LINE AND
PARALLELISM
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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
• help UICommand - Provide detailed help, navigate it through keyboard
• exit - Finalize simulation
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Multithreading
• In exampleB1.cc add
G4cout << “##### “ << G4Threading::GetNumberOfCores()
<< “ ####” << G4endl;
• rebuild and execute. Then you can set
/run/numberOfThreads 4
Or
runManger->SetNumberOfThreads(
G4Threading::GetNumberOfCores() );
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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.
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