Implement vertical chunking#222
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3D scribed outputs (temperature, salinity, velocity, tracers, ...) were written with a single chunk per record covering the whole volume (nvrt x nhoriz x 1). On large meshes this hits the 4 GB chunk ceiling and makes level-wise reads with xarray / ParaView load the entire volume just to slice one layer. Add an SCHOUT namelist switch `nchunk_vrt` controlling vertical chunking in nc_writeout3D: 0 - legacy behaviour (whole-volume chunk per time step) N>0 - N layers per chunk; default 1 (one layer per chunk) Also auto-shrink the horizontal chunk dimension when the configured shape exceeds the 4 GB netCDF-4 limit, instead of aborting outright.
…-9jbNB Claude/3d export vertical chunking 9jb nb
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@tomsail maybe we should rethink the name Maybe something like |
Member
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I can make the change after accepting the PR. Thx. |
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this PR addresses #220