One of the worst side effects of writing performance analyzing code is realizing just how much your OS moves your process around between cores. :-(
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But it doesn't have to be this way! In my homebrew engine, I only spawn as many threads as there are cores, and the entire game is just a job queue. By settings thread affinity masks, I have complete control over perf overhead.
Moreover, I can dynamically increase or decrease the # of active cores, so that means the game can load balance by hibernating cores instead of sleeping a short time until there's more work. Main menu sits at 2 cores or so, while in the game uses everything you got.
