Add some new hacks for the 8-core boxes I'm playing with.

Yes, these should be configurable.

* Up to 8 worker threads
* Bind each thread to a CPU
* mlock the sysvshm memory - because if I don't, the VM system spends a lot
  of time moving pages from the active to inactive queues and the system
  ends up contending on a single lock. Ew.