Hi all. I'm using LeakFinder product in order to hunt some memory leaks in my application. Before I can do that, however, I need support in order to understand the output of LeakFinder itself. I'm posting here a snippet of example code I'm using to understand. def createInterface(self, interface_id, *p, **kw): if "test_folder_XXX" in self.objectIds(): test_folder_XXX = getattr(self, "test_folder_XXX") self._delObject("test_folder_XXX") del test_folder_XXX self.manage_addFolder("test_folder_XXX") The snippet is silly, but I'm using it to test. Now, I run Zope (2.7.8), and run 1000 invocations of this code from an external client (using urlopen). Then, I take a look at LeakFinder: Class References Change from reference sample Persistence.PersistentMapping 3559 0 OFS.Folder.Folder 1817 0 Now, according to what I can understand, there are 1817 references. This is strange to me, since I've removed the folder object, and then I've actually deleted the object. Of course, there is something which is not clear to me. I would be grateful if someone can clarify the subject. Regards Marco -- Marco Bizzarri http://iliveinpisa.blogspot.com/