int root, MPI_Comm comm)
#define COLL_BCASTS(action, COLL_sep) \
-COLL_APPLY(action, COLL_BCAST_SIG, arrival_nb) COLL_sep \
COLL_APPLY(action, COLL_BCAST_SIG, arrival_pattern_aware) COLL_sep \
COLL_APPLY(action, COLL_BCAST_SIG, arrival_pattern_aware_wait) COLL_sep \
COLL_APPLY(action, COLL_BCAST_SIG, arrival_scatter) COLL_sep \