Return the number of cpu cores as reported to the os.

        May be different from physical_cores if, ie, intel's hyperthreading is
        enabled.

def logical_cores(self):
        """Return the number of cpu cores as reported to the os.

        May be different from physical_cores if, ie, intel's hyperthreading is
        enabled.
        """
        try:
            return self._logical_cores()
        except Exception as e:
            from rez.utils.logging_ import print_error
            print_error("Error detecting logical core count, defaulting to 1: %s"
                        % str(e))
        return 1