[mfukar]

I keep seeing this...misconception? I don't know what to call it, over most comments. The article doesn't talk about optimizations. It talks about design decisions. Someone actually took the time to sit down, ponder what kind of workloads will be handled by his application, came across an interesting dilemma, measured and tested them both, and finally reached an educated conclusion.

That right there is how you correctly choose how to implement things, contrary to popular belief. Think first, write code later.

[Confusion]

  Someone actually took the time to sit down, ponder what kind of
  workloads will be handled by his application

The most important point made in this thread is that Zed actually didn't do that, but did benchmarks for a range of workloads, suggesting he intends Mongrel2 to be able to handle all of them. The question is whether that is necessary. If ATR > 0.6 never happens in practice, it will only unnecessarily complicate Mongrel2.

[prodigal_erik]

Writing the "which fds are ready" check twice would be crazy, if neither version were markedly more efficient than the other. Optimization is the only reason to make this particular design decision, and measurement is definitely the right way to go about it.

[baq]

what good thinking gives you when your assumptions are wrong?