Locates other areas of the Java heap that have a similar structure are the selected object. This looks for fragments (chains) of object trees that have the same child reference types. How deep the tree matching goes is dependent on the maxdepth value (default = 1).
This capability can be used to identify areas of duplication, or can be used in conjunction with the Find Garbage Fragments extension to indentify locations in memory where it may be appropriate to introduce caching.