[issue1663329] subprocess/popen close_fds perform poor if SC_OPEN_MAX is hi

[Mike Klaas]

Mike Klaas added the comment:

Finally, I did not include any platform-specific optimizations, as I don't 
have AIX or solaris boxes on which to test them (and they can easily be 
added later).  An order-mag speedup on all *nix platforms is a good start.

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