Will I be able to use a metal simulator on xcode 7 os 10.11 on a macbook air 2011 or macbookpro 2010?
metal simulator on macbook air 2011?
Probably not. The reason for Metal's impressive performance is that it provides highly efficient low-level hardware access. So if you try to create a software emulator that replicates what the hardware does, you'll destroy Metal's key performance characteristics. My advice: don't bother.