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Give better warning message in partition_coefficients #58

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Nov 19, 2025
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Give better warning message in partition_coefficients #58

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6 changes: 5 additions & 1 deletion psydac/fem/partitioning.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,11 @@ def partition_coefficients(domain_decomposition, spaces, min_blocks=None):

for s, e, V, mb in zip(global_starts, global_ends, spaces, min_blocks):
if V.periodic or mb is None:
assert all(e-s+1 >= V.degree)
assert all(e-s+1 >= V.degree), f"Local number of elements (after domain decomposition) is to small for spline degree p={V.degree}: {e-s+1} is not >= {V.degree} everywhere.\n \
You can:\n \
1. increase Nel\n \
2. lower p\n \
3. decrease the MPI size."
else:
assert all(e-s+1 >= mb)

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