Metadata optimization: Only write ADIOS2 attributes from rank 0 in openPMD-api >= 0.16 #5223
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psychocoderHPC
approved these changes
Nov 18, 2024
psychocoderHPC
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We were thinking about using this as the default option generally in openPMD, but our documentation specifies that attribute writing is collective only in HDF5, and attributes can be written independently in ADIOS2. So it would have broken the API contract to assume that attributes outside of rank 0 can be ignored.
In PIConGPU, however, they can.