xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",