CGH0S7 ed1d86ade9
Merge paired MPI_Allreduce error checks to reduce global sync barriers ...
In the two Step() functions that handle both Patch and Shell Patch,
defer the Patch error check until after Shell Patch computation completes,
then perform a single combined MPI_Allreduce instead of two separate ones.
This eliminates 4 MPI_Allreduce calls per timestep (2 per Step function,
Predictor + Corrector phases each). The optimization is mathematically
equivalent: in normal execution (no NaN) behavior is identical; on error,
both Patch and Shell data are dumped before MPI_Abort.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com >
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CGH0S7
ed1d86ade9