# DMLABEL Manual Pages#

The DMLABEL object is used to mark pieces of a mesh or DM, for example to indicate that a boundary condition should hold on that section. Markers are integers, so it can be seen as a multimap between integers and mesh pieces. Insertion is amortized $$O(1)$$ since hash tables are used, but each bin is then sorted so that extraction into sorted levels is also $$O(1)$$. The total cost should be $$O(N log N)$$ for $$N$$ entries.