[issue16853] add a Selector to the select module

[Ross Lagerwall]

Ross Lagerwall added the comment:

Interesting benchmark. There is no gain for epoll with a large number of
ready fds (as expected) but at least it is no worse than poll. Poll offers
a large improvement on select, in this case.

$ ./python selector_bench.py -r 2 -m 1000 -t pipe
Trying with 2 ready FDs out of 1000, type pipe
<class 'select.EpollSelector'>
0.004317363000154728
<class 'select.PollSelector'>
0.08897221900042496
<class 'select.SelectSelector'>
0.1558117479999055

$ ./python selector_bench.py -r 100 -m 1000 -t pipe
Trying with 100 ready FDs out of 1000, type pipe
<class 'select.EpollSelector'>
0.11067074099992169
<class 'select.PollSelector'>
0.18777027299984184
<class 'select.SelectSelector'>
0.30157805000089866

$ ./python selector_bench.py -r 1000 -m 1000 -t pipe
Trying with 1000 ready FDs out of 1000, type pipe
<class 'select.EpollSelector'>
1.08963231099915
<class 'select.PollSelector'>
1.111169247998987
<class 'select.SelectSelector'>
8.283167362000313

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16853>
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