[Python-Dev] Have a big machine and spare time? Here's a possible Python bug.

Tim Peters tim.peters at gmail.com
Fri May 31 01:24:06 EDT 2019

The PR for this looks good to go:


But, I still have no idea how it works for the OP's original test
case.  So, if you have at least 80 GB of RAM to try it, I added
`arena.py` to the BPO report:


That adds code to the OP's test case to display the times needed to
build the tree and to tear it down (& to display some obmalloc stats).
So there's no need for you to think about anything ;-)

I'm keen to get feedback on this before merging the PR, because this
case is so very much larger than anything I've ever tried that I'm
wary that there may be more than one "surprise" lurking here.  The PR
certainly addresses "an obvious" (with hindsight) problem - but is
that the _only_ gross design flaw here?

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