On Nov 7, 2008, at 6:21 AM, joelanman wrote:
> > Hi, > > I'm getting a memory leak with my app - the stack is apache2, > mod_wsgi, web.py - and then a lot of sqlalchemy and my own code. The > issue may well not be with my usage of SQLA - just making sure there's > nothing I might be doing wrong with it. > > At the start of every web request (__init__ for a controller) I open a > Session(), and in __del__ I close() it. Is there anything else I ought > to do? that is the correct procedure. The Session weak references everything anyway so its hard for it to cause a fast leak. > Any pointers on how to chase down my memory problem? one way is to visually inspect your application for any global variables, like dictionaries, caches, etc. and to analyze if they grow arbitrarily. Anything that is global or held across requests is suspect and should be analyzed carefully. Also, any usage of __del__ should be carefully scrutinized, as a cyclical reference on an object that implements __del__ cannot be garbage collected (that you're using __del__ might be the issue here. __del__ is actually never really needed as you can use a weakref callback for cleanup activities). Some third party libraries can also cause "leaky" behavior, such as Beaker. Try disabling any caching utilities to see if that isolates the issue. The other way is to analyze leaks is to use gc facilities - such as peeking into gc.get_objects() to see what kinds of objects are growing the collection, or gc.set_debug(gc.DEBUG_LEAK) which deals with unreachable objects (i.e. because of __del__). I usually opt for the former since I don't really use __del__ but I use global caches of things quite a bit. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
