type_struct | Imitating static typed struct
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kandi X-RAY | type_struct Summary
Imitating static typed struct. All type is checked by === method.
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QUESTION
This an MPI version of the NBody problem. I already have an OpenMP version and its results are the same as the nbody version with one thread, but the MPI results differ, above all at the last interactions. At the first interactions, the outputs are quite similar but at the end, the outputs differ a lot.
...ANSWER
Answered 2021-Feb-03 at 19:48You get different results because your algorithm is solving a completely different problem when running with more than one MPI rank.
You are performing domain decomposition by splitting the array of particles in parts, and then each rank computes the forces only taking into account the particles in its own subdomain:
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