Windows builds of Python should up FD_SETSIZE

[pitrou]

Default Windows builds of Python allow 512 maximum sockets in select(). This limit can be hit when an application has many connections. This is sometimes hit by users of distributed on Windows clusters.

Bumping it to a higher value (e.g. 2048) is straightforward and does not adverse consequences. It would be nice to our users if Anaconda builds of Python had such a higher limit.

See upstream issue: https://bugs.python.org/issue28708

[mrocklin]

I would like to see this happen.

[pitrou]

Also submitted as a PR to conda-forge: conda-forge/python-feedstock#87

[ilanschnell]

I've created patches which set FD_SETSIZE to 2048 on Windows, which we will apply to Python 2.7 and 3.5 from now on.

[pitrou]

Thank you!

[mrocklin]

Thank you @ilanschnell !