[issue8873] Popen uses 333 times as much CPU as a shell pipe on Mac OS X

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> This problem has come up before.  It was a bug introduced I think when
> the subprocess module was first incorporated into Python.  I don't
> recall if the default was changed in 2.7 or 3.x.

According to the docs it is still unbuffered by default. I've added a
documentation note about performance issues in r81652.

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