DavidDureau

For performance reason, I would prefer a solution with light objects like `MatVarIndex`, `CellLocalId` and a `MatItemVariableScalarInViewT`. Would it be possible?

@grospelliergilles , you did a good job and I agree with the optimizations you gave. In addition, is it possible to port in `arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc` : - https://github.com/arcaneframework/framework/blob/cbb55d539f7ce47ddb0a9f2215ebf7b885f0169f/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc#L63 - https://github.com/arcaneframework/framework/blob/cbb55d539f7ce47ddb0a9f2215ebf7b885f0169f/arcane/src/arcane/materials/AllCellToAllEnvCellConverter.cc#L83 -...

That's true, in my example I assume I have only one material in my environment. To be more general, we have to consider that `asyncFill` would perform the equivalent of...

I think we could consider `dim1` and `dim2` are not allowed to change during the simulation. Note: the number of dimensions is not limited to 2, we could have 2...

The case where the cost per cell is the same for all cells is interesting. Now, the number of partitions is equal to Ni x Nj x Nk which limits...