>there were no tools that allowed to evaluate the performance. This reminds me of Brian Cantril's remarks in a talk (sorry, can't remember which one) about Sol

>there were no tools that allowed to evaluate the performance. This reminds me of Brian Cantril's remarks in a talk (sorry, can't remember which one) about Solaris and DTrace. For the first time ever, DTrace gave them the ability to look into the live performance of low-level OS code and they found a lot of pathological worst-case behavior that no one suspected beforehand. No matter how good your team is it's really hard to accurately predict how a system will behave, measurement is key.