|Message: Re: How is parallelization implemented using MPI and Geant4?||Not Logged In (login)|
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As expected this does not work. The entire program (including the sensitive detector and the custom run action) is executed for every thread which results in the output file (histogram) being overwritten (lost update).
Looks like one would have to create histogram files for each execution and then cumulate the data on their own.
The other solution would be to somehow send the histograms of all threads (slaves) to the master thread. I can't find functionality for this in the undocumented mpi_interface though.
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