[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Python-Dev] No longer enable Py_TRACE_REFS by default in debug build

> The main question is if anyone ever used Py_TRACE_REFS? 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.get_objects() 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

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.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20190415/291b3792/attachment.html>