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Question MPI for beginners 

Forum: Documentation and Examples
Date: 31 Mar, 2011
From: Henry Wang <Henry Wang>

Hi,

Can someone please provide a high level picture of how MPI works with Geant4? I've used MPI before with cloud computing, but I have no idea how it is set up with Geant4. mpiexec -n 20 program.py was how I executed a MPI program where -n specified the number of nodes. So in Geant4, it seems MPI is built into the code, so please briefly describe how it works.

Thanks, Henry

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