Hi, I am trying to work out questions such as * Why are there thousands of Module data constructors allocated when building something with GHC * What is allocating all a lot of strings when building GHC? In order to do this I can use gdb in order to find some of the Module/String closures but then I'm a bit stuck about what to do. gdb displays a list of all the Module closures for example and then you can usually try to find the retainer for Module by using findPtr. If the retainer is a THUNK closure, it would be easy, as THUNK closures have DWARF information which maps straight to a particular line. However if the retainer is just some other data constructor, for example, the Module is stored in a Map, it's data constructors all the way up and none of them have DWARF info. I need to fall back to domain specific knowledge to work out where such a sequence of constructors might appear in my program. * Is there anything better I can do to map a constructor allocation to a more precise source location? The string closures were causing me some particular issues as `findPtr` was not showing any retainers so it's hard to work out why they are not GCd. * What situations can an object be retained but show no retainer when using findPtr? Cheers, Matt