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Optim ewald long 2 d

Nicolas Tancogne-Dejean requested to merge optim_ewald_long_2D into develop

Description

Optimizing the calculation of the Ewald summation for 2D systems. On a large system (1900 atoms), the cost of this routines is reduced from 1900s to only 550s.

News snippet

Optimizing the calculation of the Ewald summation for 2D systems.

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.
Edited by Nicolas Tancogne-Dejean

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