else if ((host_nb == 1)
&& (cost_or_zero(flops_amount, 0) == 0.0))
return surf_network_model_communicate(surf_network_model, host_list[0], host_list[0],bytes_amount[0], rate);
else if ((host_nb == 1)
&& (cost_or_zero(flops_amount, 0) == 0.0))
return surf_network_model_communicate(surf_network_model, host_list[0], host_list[0],bytes_amount[0], rate);