Greg Price b6cc21b438 debug: Add facility to dump tracemalloc snapshots. ...

Originally this used signals, namely SIGRTMIN.  But in prod, the
signal handler never fired; I debugged fruitlessly for a while, and
suspect uwsgi was foiling it in a mysterious way (which is kind of
the only way uwsgi does anything.)

So, we listen on a socket.  Bit more code, and a bit trickier to
invoke, but it works.

This was developed for the investigation of memory-bloating on
chat.zulip.org that led to a331b4f64 "Optimize query_all_subs_by_stream()".

For usage instructions, see docstring.

2017-11-28 15:52:07 -08:00

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