[pypy-issue] [issue1319] PyPy 1000x slower than CPython for set.difference_update

[Adam Sherwin]

New submission from Adam Sherwin <absherwin at gmail.com>:

Here's a small example that illustrates the problem:

aset=set(range(100000))
evens=[x for x in aset if not x%2]
for i in evens: aset.difference_update(set([i]))

This ran in 84ms in CPython 2.7.2 and 115s in PyPy 1.9.0.

Let me know if I can provide any more information or otherwise be helpful in 
resolving this.

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messages: 4977
nosy: absherwin, pypy-issue
priority: performance bug
release: 1.9
status: unread
title: PyPy 1000x slower than CPython for set.difference_update

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PyPy bug tracker <tracker at bugs.pypy.org>
<https://bugs.pypy.org/issue1319>
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