: name_(name), endpoint(endpoint), send_size(size), send_type(datatype){};
// CollTI: bcast, reduce, allReduce, gather, scatter, allGather, allToAll
: name_(name), endpoint(endpoint), send_size(size), send_type(datatype){};
// CollTI: bcast, reduce, allReduce, gather, scatter, allGather, allToAll