Pythia example does not work

ROOT
1

Hello,

I am trying to run pythia example code in $ROOT_DIR/tutorials/pythia/pythia8.C
I have installed pythia 8230 and its working fine (all pythia example files compile and run flawlessly). However, if I run ‘.x pythia8.C’ as is suggested I get following error:

Processing pythia8.cc...
cling::DynamicLibraryManager::loadLibrary(): libpythia8.so: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libEGPythia8.so for TPythia8.h
cling::DynamicLibraryManager::loadLibrary(): libpythia8.so: cannot open shared object file: No such file or directory
cling::DynamicLibraryManager::loadLibrary(): libpythia8.so: cannot open shared object file: No such file or directory
cling::DynamicLibraryManager::loadLibrary(): libpythia8.so: cannot open shared object file: No such file or directory
cling::DynamicLibraryManager::loadLibrary(): libpythia8.so: cannot open shared object file: No such file or directory
cling::DynamicLibraryManager::loadLibrary(): libpythia8.so: cannot open shared object file: No such file or directory
IncrementalExecutor::executeFunction: symbol '_ZNK8TPythia812EventListingEv' unresolved while linking [cling interface function]!
You are probably missing the definition of TPythia8::EventListing() const
Maybe you need to load the corresponding shared library?
IncrementalExecutor::executeFunction: symbol '_ZNK8TPythia815PrintStatisticsEv' unresolved while linking [cling interface function]!
You are probably missing the definition of TPythia8::PrintStatistics() const
Maybe you need to load the corresponding shared library?
IncrementalExecutor::executeFunction: symbol '_ZNK8TPythia810ReadStringEPKc' unresolved while linking [cling interface function]!
You are probably missing the definition of TPythia8::ReadString(char const*) const
Maybe you need to load the corresponding shared library?
IncrementalExecutor::executeFunction: symbol '_ZN8TPythia810InitializeEiid' unresolved while linking [cling interface function]!
You are probably missing the definition of TPythia8::Initialize(int, int, double)
Maybe you need to load the corresponding shared library?
IncrementalExecutor::executeFunction: symbol '_ZN8TPythia8C1Ev' unresolved while linking [cling interface function]!
You are probably missing the definition of TPythia8::TPythia8()
Maybe you need to load the corresponding shared library?

I am using ubuntu, root version 6.12, pythia version 8230 and g++ version 5.4. My .bashrc stands:

source ~/root/bin/thisroot.sh
export PYTHIA8=/home/mato/pythia8230
export PYTHIA8DATA=$PYTHIA8/share/Pythia8/xmldoc
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PYTHIA8/lib

Any idea what might be wrong?

Martin

2

You can learn which “pythia8” library your ROOT wants:

ldd `root-config --libdir`/libEG*so | grep -i pythia

Try a “brutal fix” … in your macro, right before gSystem->Load("libEG");, try to add gSystem->Load("libpythia8");.

3

This is output of your command:
/home/mato/root/lib/libEGPythia8.so:
libpythia8.so => not found

I get same error after I added gSystem->Load(“libpythia8”);.

4

Try:

find ${PYTHIA8} -name "lib[pP]ythia*" -print

BTW. How did you compile ROOT that it knows about Pythia8 but it cannot find it now?