Hi, Working with the new version I have encountered some problems which look like memory leaks to me.
I've written 3 test methods that reproduce the problems, and would appreciate your response. Thanks *Problem 1* Occurs when you do the all of the following 1. Define a generator method 2. Insert a try/except clause in the method 3. define an inner method that uses some local variable 4. Call the generator method without reaching the "StopIteration" Looks like the local variable used by the inner method is never cleared. This code reproduces the problem: def test_generator_memory_leak(self): """ Ipy 2.6 This test reproduces a memory leak when calling a generator method without reaching the end. """ def coroutine(): try: pass except: pass just_numbers = range(1,1000) def inner_method(): return just_numbers yield None yield None from System import GC def get_memory(): for _ in xrange(4): GC.Collect() GC.WaitForPendingFinalizers() return GC.GetTotalMemory(True)/1e6 before = get_memory() for j in xrange(10000): crt = coroutine() crt.next() after = get_memory() self.assert_(after-before > 10,'There should be a memory leak in this case.before=%s after=%s' % (before,after)) *Problem 2* The same as problem, just instead of defining an inner method, just call "eval" with any string def test_generator_memory_leak2(self): """ Ipy 2.6 This test reproduces a memory leak when calling a generator method without reaching the end. """ def coroutine(b_bool): try: pass except: pass if False: eval("") just_numbers = range(1,1000) yield None yield None from System import GC def get_memory(): for _ in xrange(4): GC.Collect() GC.WaitForPendingFinalizers() return GC.GetTotalMemory(True)/1e6 before = get_memory() for j in xrange(10000): crt = coroutine(False) crt.next() after = get_memory() self.assert_(after-before > 10,'There should be a memory leak in this case.before=%s after=%s' % (before,after)) *Problem 3* This is actually a our solution to problems 1,2. We noticed that if we end the iteration by using "throw" then the memory doesn’t rise on subsequent instances. Still there some memory increase that depends on the size of the local variable which doesn’t seem to go away: def test_generator_memory_leak2(self): """ Ipy 2.6 when exiting a generator method with an exception, some objects are never collected This seems to be static to the type (the leak does not grow if we repeat the experiment """ def coroutine(): just_numbers = range(1,1000000) def inner_method(): return just_numbers yield None raise Exception("some exception") # comment out this line to make the test not work from System import GC def get_memory(): for _ in xrange(4): GC.Collect() GC.WaitForPendingFinalizers() return GC.GetTotalMemory(True)/1e6 before = get_memory() crt = coroutine() try: crt.next() crt.next() except: pass crt = None after = get_memory() self.assert_(after-before > 10,'There should be a memory leak in this case.before=%s after=%s' % (before,after))
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