[issue30404] Make stdout and stderr truly unbuffered when using -u option

[STINNER Victor]

STINNER Victor added the comment:

While I hope that users of the -u options expect the slow-down, would it be possible to benchmark it?

For example, try to write setup.py content character by character to stdout using -u or not, into a TTY, into a pipe and/or a file. I'm curious if the line buffering vs really unbuffered has a significant impact on performances.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30404>
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