[issue22003] BytesIO copy-on-write

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Even after totally isolating a CPU for e.g. django_v2 and with frequency scaling disabled, numbers still jump around for the same binary by as much as 3%.

That's expected. If the difference doesn't go above 5-10%, then you IMO can pretty much consider your patch didn't have any impact on those benchmarks.

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<http://bugs.python.org/issue22003>
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