sbstndb/sbstndbs

I Tested this PR on two cases (`advection-2d` and `burgers` in MRA mode) with MPI from 1 to 16 ranks and - I did not identify any bugs for now...

I have to check the performance gain of this PR. Please Wait before merging

At this point, the neighbourhood construction is working fine. I have now to construct it in a periodic case.

At this point, I have an issue on Choleski with 32 ranks on advection-2d --min-level 4 or lower (the modified balanced case). Here is the error : ``` terminate called...

At this point, this PR works at least for advection-2D. TODO : - avoid multiple all_reduce ! - resolve the segfault in the construct_periodic_cells - git rebase - remove compilation...

I have to manage the `WITH_MPI=OFF case` before merging.

At this point, the new benchmark output is : ``` ---------------------------------------------------------------------------- Benchmark Time CPU Iterations ---------------------------------------------------------------------------- ADVECTION_2D/iterations:1 1 ADVECTION_2D/iterations:1 1 ADVECTION_2D/iterations:1 1 ADVECTION_2D/iterations:1 1 ADVECTION_2D/iterations:1 1 ADVECTION_2D/iterations:1 1 ADVECTION_2D/iterations:1 1...

I will try.

It seems that some conversions are still missing. This PR needs a little more work before it can be reviewed and merged.

At this point, I have to - solve the HighFive xtensor issue (mpi-mamba) - solve the cppcheck issue (it enforces me to always use the old include path even if...