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Question Re: Irreproducible results 

Forum: Multithreading
Re: Question Irreproducible results (Tom Roberts)
Date: 27 Feb, 2015
From: Andrea Dotti <Andrea Dotti>

Tom, I am not sure I understand your question. First of all, is your MPI code using Geant4 provided MPI interface? Are you using something else? It seems to me the latter case, right?

Also, with 10.1 are you compiling G4 with MT support (independently if you use threading or not?). In case you have enabled MT, are you using MT or not?

Please note that, if you are using MT, you need special care in throwing random number, in particular, you cannot use CLHEP interfaces, but instead using G4Random interface. https://twiki.cern.ch/twiki/bin/view/Geant4/QuickMigrationGuideForGeant4V10#Random_numbers

We verify periodically reproducibility in MT and in SEQUENTIAL mode, and QGSP_BERT is reproducible in 10.1, with the exception of the (optional) radioactive-decay module (that I understand you are not using).

Andrea

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