a_p128            240 ompi/mca/coll/tuned/coll_tuned_decision_fixed.c     const double a_p128 = 1.6134e-6; /* [1 / byte] */
a_p128            275 ompi/mca/coll/tuned/coll_tuned_decision_fixed.c     else if (communicator_size < (a_p128 * message_size + b_p128)) {