1% success rate is typical when interviewing developers.
Also they get asked multiple exercises, not doing great at one is not eliminatory.
Being able to quickly identify whether an individual is exceptionally good is very important to ensure the employer can fast-track them and be responsive quickly enough that he doesn't accept another offer.
cpu cache line optimization is relevant to a superminority of programming contexts
if you're working in those contexts then it's all fine, but it's important to acknowledge that most software development is bottlenecked by concerns far above this level of concern
Also they get asked multiple exercises, not doing great at one is not eliminatory.
Being able to quickly identify whether an individual is exceptionally good is very important to ensure the employer can fast-track them and be responsive quickly enough that he doesn't accept another offer.