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Initialize Sherpa only once for multiple lumi sections #12199

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Nov 2, 2015
Merged

Initialize Sherpa only once for multiple lumi sections #12199

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20 changes: 11 additions & 9 deletions GeneratorInterface/SherpaInterface/src/SherpaHadronizer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,7 @@ class SherpaHadronizer : public gen::BaseHadronizer {
unsigned int maxEventsToPrint;
std::vector<std::string> arguments;
SHERPA::Sherpa Generator;
bool isInitialized;
bool isRNGinitialized;
};

Expand Down Expand Up @@ -169,7 +170,7 @@ SherpaHadronizer::SherpaHadronizer(const edm::ParameterSet &params) :
arguments.push_back(shRes.c_str());
arguments.push_back(shRng.c_str());
arguments.push_back(shNoMT.c_str());

isInitialized=false;
//initialization of Sherpa moved to initializeForInternalPartons
}

Expand All @@ -179,14 +180,15 @@ SherpaHadronizer::~SherpaHadronizer()

bool SherpaHadronizer::initializeForInternalPartons()
{
int argc=arguments.size();
char* argv[argc];
for (int l=0; l<argc; l++) argv[l]=(char*)arguments[l].c_str();

Generator.InitializeTheRun(argc,argv);
//initialize Sherpa
Generator.InitializeTheEventHandler();

//initialize Sherpa but only once
if (!isInitialized){
int argc=arguments.size();
char* argv[argc];
for (int l=0; l<argc; l++) argv[l]=(char*)arguments[l].c_str();
Generator.InitializeTheRun(argc,argv);
Generator.InitializeTheEventHandler();
isInitialized=true;
}
return true;
}

Expand Down