xbt_cfg_register_string("smpi/coll-selector", "default", nullptr, "Which collective selector to use");
xbt_cfg_register_alias("smpi/coll-selector","smpi/coll_selector");
xbt_cfg_register_string("smpi/gather", nullptr, &_check_coll_gather, "Which collective to use for gather");
xbt_cfg_register_string("smpi/coll-selector", "default", nullptr, "Which collective selector to use");
xbt_cfg_register_alias("smpi/coll-selector","smpi/coll_selector");
xbt_cfg_register_string("smpi/gather", nullptr, &_check_coll_gather, "Which collective to use for gather");