-
Matthieu Schaller authored
Only drift the particles that need drifting Here is an algorithmic speed-up. The plan is to drift only the cells that contain an active particles and the cells that have at least one neighbour with an active particle. - If this condition is not met then `runner_do_drift()` just returns without performing any operation. - If the condition is met, `runner_do_drift()` moves all particles (as before) from the last point in time where a drift was performed. We record for each cell the last time a drift was done such that we now by how much to drift things when needed. Two exceptions to this rule: before reconstructing and before duping a snapshot, we drift all particles as we need correct position information at these two stages. Note that I have made this an engine policy to ease the testing. Drifting all particles can be restored by setting the right flag. @nnrw56 could you check that the function `cell_is_drift_needed()` makes sense and fully does what it says it does ? Also could you let me know whether you also agree with the whole logic and implementation. See merge request !225
49e93734