[issue8873] Popen uses 333 times as much CPU as a shell pipe on Mac OS X
report at bugs.python.org
Wed Jun 2 19:09:19 CEST 2010
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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