[PATCH 2 of 2] add support for setting worker processes and CPU affinity automatically

[Joshua Zhu]

Hi,

It's a little bit inconvenient to set the CPU affinities with
many-core-system. For example, to fully utilize a 16-core Linux box, we
have to write something like this:
worker_processes 16;
worker_cpu_affinity  1000000000000000 0100000000000000 0010000000000000
0001000000000000 0000100000000000 0000010000000000 0000001000000000
0000000100000000 0000000010000000 0000000001000000 0000000000100000
0000000000010000 0000000000001000 0000000000000100 0000000000000010
0000000000000001;

This patch will make life much easier:
worker_processes auto;
worker_cpu_affinity auto;

Please see the attachment for more detail.

Regards,

-- 
Joshua Zhu
Senior Software Engineer
Server Platforms Team at Taobao
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