Merge branch 'jjardon/max-jobs_1.2' into 'bst-1.2'

#        Tiago Gomes <tiago.gomes@codethink.co.uk>

import os

import multiprocessing  # for cpu_count()

from collections import Mapping, OrderedDict

from pluginbase import PluginBase

from . import utils

        # Extend variables with automatic variables and option exports

        # Initialize it as a string as all variables are processed as strings.

        output.base_variables['max-jobs'] = str(multiprocessing.cpu_count())

        # Based on some testing (mainly on AWS), maximum effective

        # max-jobs value seems to be around 8-10 if we have enough cores

        # users should set values based on workload and build infrastructure

        output.base_variables['max-jobs'] = str(min(len(os.sched_getaffinity(0)), 8))

        # Export options into variables, if that was requested

        output.options.export_variables(output.base_variables)