a_p64             238 ompi/mca/coll/tuned/coll_tuned_decision_fixed.c     const double a_p64  = 2.3679e-6; /* [1 / byte] */
a_p64             289 ompi/mca/coll/tuned/coll_tuned_decision_fixed.c     } else if (communicator_size < (a_p64 * message_size + b_p64)) {