[Python-Dev] No longer enable Py_TRACE_REFS by default in debug build (original) (raw)

Victor Stinner vstinner at redhat.com
Tue Apr 16 05:11:05 EDT 2019

Hi Michael,

Do you know the tracemalloc module? Did you try it? It works on a regular Python (compiled in debug mode).

I would be curious to know if tracemalloc also allows you to track the memory leak.

sys.getobjects() is just a list of objects. Do you have a tool written on top of it to track memory leaks? If yes, how?

Victor

Le mar. 16 avr. 2019 à 00:28, Michael Sullivan <sully at msully.net> a écrit :

> The main question is if anyone ever used PyTRACEREFS? Does someone > use sys.getobjects() or PYTHONDUMPREFS environment variable? I used sys.getobjects() today to track down a memory leak in the mypyc-compiled version of mypy. We were leaking memory badly but no sign of the leak was showing up in mypy's gc.getobjects() based profiler. Using a debug build and switching to sys.getobjects() showed that we were badly leaking int objects. A quick inspection of the values in question (large and random looking) suggested we were leaking hash values, and that quickly pointed me to https://github.com/mypyc/mypyc/pull/562. I don't have any strong feelings about whether to keep it in the "default" debug build, though. I was using a debug build that I built myself with every debug feature that seemed potentially useful. -sully

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