Hi, Le mar. 19 nov. 2019 à 18:33, Sümer Cip <sum...@gmail.com> a écrit : > First of all, I would like to thank for such a useful tool for debugging > memory issues. I am pretty proud as a Python lover that we have such a tool: > tracemalloc:)
As the module author: you're welcome ;-) > AFAIU, tracemalloc holds a single traceback per-object: "tracemalloc" name means that a "trace" is stored in mapping associated to an allocated memory block. A trace is just: (size, traceback): memory block in bytes, and the Python traceback where the memory block has been allocated. tracemalloc is not aware of Python objects at all. For example, it is unable to associate an object __dict__ to the object. It works at malloc() and free() level, not at the _PyObject_GC_Malloc() level. One advantage is that memory which is not tracked by the GC is tracked by tracemalloc. Another is that the implementation is "simple" (from my point of view :-)). One drawback is that tracemalloc traces are harder to analyze. > """ > Output: > ... > 5.py:38: size=9264 B, count=1, average=9264 B > [' File "5.py", line 38', ' a.alloc_more()', ' File "5.py", line 32', ' > self._d += [1] * 512'] > """ When the internal storage of a Python list grows, the old memory block is released and a new memory block is allocated. From the tracemalloc point of view, the old trace is removed, a new trace is created. There is no relationship between the two traces, even if realloc() has been used. In tracemalloc, realloc() traces work as two isolated operations: free() + malloc(). > Now, allocation of alloc and alloc_more functions seems to be merged into a > single traceback. Is it possible we add (maybe a constant number of > tracebacks) per object? This might be pretty useful to find the responsible > leak in situations where same object is modified in many places? You might try to take snapshots frequently and write an heuristic to link traces which look similar... good luck with that :-) -- There are other tools to track Python memory usage which may help you to provide a view closer to what you are looking for. Victor -- Night gathers, and now my watch begins. It shall not end until my death. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/4DTIRXTKUB5XBBNWNGASGD2ZMOS2WDVJ/ Code of Conduct: http://python.org/psf/codeofconduct/
