code: def addGlobalServices(self):
          
          if self.options.get('global_cache') and self.options.get('cache'):
              # only add the cache service here if the global_cache and cache
              # options were set to True
              _cache = self.getCacheService()
              _cache.startService()
docs: This is where we put service that we don't want to be duplicated on
          worker subprocesses