def store_source_info(self, calc_times):
        """
        Save (weight, num_sites, calc_time) inside the source_info dataset
        """
        if calc_times:
            source_info = self.datastore['source_info']
            arr = numpy.zeros((len(source_info), 3), F32)
            ids, vals = zip(*sorted(calc_times.items()))
            arr[numpy.array(ids)] = vals
            source_info['weight'] += arr[:, 0]
            source_info['num_sites'] += arr[:, 1]
            source_info['calc_time'] += arr[:, 2]
Save (weight, num_sites, calc_time) inside the source_info dataset