Facebooks modifications to memcached for I/O, CPU and memcory scaling
Latest commit 7025587 Nov 6, 2008 ps auto detect the number of cpus
Summary: Instead of relying on -t to run on greater than 4 cpu systems, auto detect the number of active processors

Reviewed By: ttung

Test Plan: ran memcached on 8 core machine, 9 threads created.  ran on 4 core machine, 5 threads created.

Revert: OK