FAQ.How to know how many CPUs are present?
Feedback.

Answer: Try this function:
Example:

Function GetCPUCount() As integer
  #if TargetCarbon
    Declare Function MPProcessors Lib "CarbonLib" () as integer
  #else
    Declare Function MPProcessors Lib "MPLibrary" () as integer
  #endif
  
  Return MPProcessors()
End Function

Notes: Your app will than need that library to launch on Classic. To avoid this the MBS plugin checks if this library is available and return 1 if it's not available.