Currently wordpress doesn't support multiple core CPU's. PHP, which wordpress is built using doesn't support multiple core CPU's either, but there is a way around that which can be found here:
All new CPU's have multiple cores like intel's quad core CPU which has 4
cores and some motherboards have two CPU sockets so 2 quad core CPU's
would mean there would be 8 cores.
WordPress should support multiple core CPU's because it will mean people won't need to have as many servers in their cluster, because alot of CPU power is being wasted because wordpress doesn't support
multiple core CPU's.
So please wordpress, the next version of wordpress should support multiple core CPU's. If you have to work with the mysql and apache
teams with this then please do it.
Can you pass on my feature request to the WordPress development team?