Method to increase the amount of memory overheaded asked for the master node.
        Return: new master memory overhead if success, 0 if it cannot be increased.

def more_master_mem_overhead(self, mem_increase_mb=1000):
        """
        Method to increase the amount of memory overheaded asked for the master node.
        Return: new master memory overhead if success, 0 if it cannot be increased.
        """
        old_master_mem_overhead = self.master_mem_overhead
        new_master_mem_overhead = old_master_mem_overhead + mem_increase_mb
        if new_master_mem_overhead + self.mem_per_proc < self.hw.mem_per_node:
            self.set_master_mem_overhead(new_master_mem_overhead)
            return new_master_mem_overhead

        raise self.Error('could not increase master_mem_overhead further')