[Python-checkins] [Python-Dev] cpython: Switch subprocess stdin to a socketpair, attempting to fix issue #19293 (AIX

[Victor Stinner]

"For the record, pipe I/O seems a little faster than socket I/O under Linux"

In and old (2006) email on LKML (Linux kernel), I read:
"as far as I know pipe() is now much faster than socketpair(), because pipe()
uses the zero-copy mechanism."
https://lkml.org/lkml/2006/9/24/121

On Linux, splice() can also be used with pipes for zero-copy
operations. I don't know if splice() works with socketpair(). Well, I
don't think that Python uses splice() now, but it may be interesting
to use it. Or sendfile() uses it maybe internally?

Victor