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Optim. LDA+U submesh

Nicolas Tancogne-Dejean requested to merge optim_lda_u_submesh into develop

Description

For DFT+U, the orbitals defined on the submesh are first copied to a local function on the mesh before computing the dot product, as we do for the pseudopotentials. This makes this part of the code faster, as checked using oct-test, for various spacings (from 0.5a.u. to 0.2 a.u.) and values of AOThreshold (from 0.6 to 0.1).

News snippet

Small optimization of LDA+U

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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