Max Power wrote on Sat, Jul 22, 2017 at 10:49:05PM +0200:

> but In addition to your advice...
> possible that there is no official documentation?
> This is the questions...!

And i already answered that:

No, there isn't, because:

 1. It varies from platform to platform.
 2. It varies from time to time.

 3. It is rarely relevant because application software
    usually is the bottleneck in practice, *not* the OS.

So, 1 & 2 mean that maintaining such a list would cause considerable
work for developers, and 3 means that it would be virtually useless.

That's why we don't do it.

Yours,
  Ingo

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