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Fixes and improvements to h_max_active

Matthieu Schallerrequested to merge
mladen_hmax_optimization into master

Optimisations:

  • In all the ghost operations, start the counter for h_max_active at 0.
  • In the star drift, only collect h_max_active of the stars that are active for feedback (i.e. the stars that will actually loop). This matches the ghost updates.
  • In the star recv, only collect h_max_active of the stars that are active for feedback.

Bug fixes:

  • In the star ghost, only check h > h_max_active for stars active for feedback. (bug in the debug check)
  • In all the ghosts, also update the cell's h_max_active counters for particles at the global h_max or h_min limits.
Edited by Matthieu Schaller

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