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Forum: Multithreading
Re: Question Simulation time increase much faster than direct proportional with events number (Alex Kav)
Re: Question Re: Simulation time increase much faster than direct proportional with events number (Alex Kav)
Re: Feedback Re: Simulation time increase much faster than direct proportional with events number (Andrea Dotti)
Date: 14 Dec, 2016
From: Alex Kav <Alex Kav>

Dear Andrea,

Great thanks for your analysis of the situation with decreasing the simulation speed with number of events in my simulation of neutron stimulated gamma spectra.

Now I report about additional features of this which I opened recently. This slowdown appears when I conduct the simulation with JENDL4.0 data base instead of G4NDL on cluster computers in multithread mode (I use JENDL4.0 due to simulated gamma spectra have better agreement with experimental spectra than at using G4NDL). I've downloaded this data base from https://www-nds.iaea.org/geant4/ and unpacked it into "..../G4.10.2/geant4.10.02.p01-install/share/Geant4-10.2.1/data" folder. I defined environmental variable G4NEUTRONHPDATA as "export G4NEUTRONHPDATA= "..../G4.10.2/geant4.10.02.p01-install/share/Geant4-10.2.1/data/JENDL4.0" and run the simulation.

Maybe it was needed to do something else for correct using this data base?

But I've done all the same both for laptop and for cluster and simulation on the laptop goes with approximately constant speed while on the cluster it is slowdown with number of events (at using G4NDL no any slowdown is observed).

Could you give some additional comments to this situation take into account this information? Maybe there is something incorrect in my using not default neutron data base? But why I have different situation with speed of my simulation on laptop and on cluster?

Best regards,

Alex

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1 Feedback: Re: Simulation time increase much faster than direct proportional with events number   (Andrea Dotti - 14 Dec, 2016)
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