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Change the task splitting criterion for gravity tasks

Merged Matthieu Schaller requested to merge gravity_depth2 into master

Fixes #457 (closed).

Implements three main changes:

  • When deciding whether or not to split a gravity task use a relative depth and not an absolute depth.
  • Send the maximal local depth to the proxies when exchanging cells.
  • Add a drift_out implicit task to resolve the high number of gpart_drift -> gravity task dependencies.

The parameter file gets a new parameter to control the depth level of the gravity tasks Scheduler:cell_subdepth_diff_grav which defaults to 4. That is, a gravity task can only be split if it is 4 levels (or more) above the leaf cells in that part of the tree. The best default value of this parameter needs to be investigated.

Edited by Matthieu Schaller