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Facebooks modifications to memcached for I/O, CPU and memcory scaling
Branch: master

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
latest commit 7025587562
ps authored
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