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This example can be found in /reg/g/psdmin /sdf/group/lcls/ds/ana/tutorials/examplePython3psana1_examples/mpiGatherv.py.  It uses the more performant, but more difficult to use, "Gatherv" array implementation (vs. the lowercase "gather" which uses python objects shown here).  There is also "Gather" method which more easily gathers arrays from all ranks that are of the same size.

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