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Jorn Bruggeman edited this page May 13, 2022 · 2 revisions

About bitwise reproducibility

For a given setup, GETM can produce bitwise identical results (NetCDF files) independent of subdomain decomposition, provided that:

  • GETM is built with appropriate compiler flags. For the Intel Fortran compiler, the default -fp-model fast=1 or /fp:fast=1 is not suitable for this, as described here! Instead, -fp-model precise or /fp:precise can be used. Other fp options may work as well, but have not been tested.
  • When using "sponge" treatment of open boundaries for tracers, open boundaries cannot be located on the outer edge (T points) of any subdomain.
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