Skip negative cell indices when packing coefficients #3361
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RemDelaporteMathurin
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Aug 22, 2024
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Tested it locally with this script and everything runs fine. The SEGV I was previously having doesn't appear anymore.
Thanks @jorgensd ! 🎉
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@jpdean do you have time to look at this? |
garth-wells
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Sep 11, 2024
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@jorgensd Is there a change we could make to avoid this check? I haven't looked at the details for a long time . . .
schnellerhase
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Sep 11, 2024
* Skip negative cell indices when packing coefficients * Simplify MPI send recv * Ruff formatting * Small logic simplification --------- Co-authored-by: Garth N. Wells <gnw20@cam.ac.uk>
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Continuation of #3260.
If one has multiple disjoint sub-meshes in a variational form, then restricting packing by
enabled_coefficientsper integral type is not sufficient.Example follows:
Divide an interval mesh in three disjoint cell sets (left, center, right).
If we want to create a coupling from the right submesh to the parent mesh at the interface between center and right),
we can add an integral
(u_parent("+")-u_parent("-"))*v_right("+")*dS(interface_rc)to our variational form.Similarly we could do the same for the left integral:
(u_parent("+")-u_parent("-"))*v_left("+")*dS(interface_lc).However, now both coefficient v_right and v_left will be packed for all facets marked with either interface_rc or interface_lc, which leads to undefined behavior (segfaults).
The following PR adds a check after fetching the cell during packing, and only packs coefficients if the cell index is positive.
Issue reported by @RemDelaporteMathurin when trying to adapt my example: https://gist.github.com/jorgensd/8a5c32f491195e838f5863ca88b27bce#file-problem-py to multiple surfaces.