for (i = 1; i < communicator_size; i++) {
sprintf(mailbox, "%s_p%d_p0", allreduce_identifier, i);
xbt_dynar_push_as(comms, msg_comm_t,
for (i = 1; i < communicator_size; i++) {
sprintf(mailbox, "%s_p%d_p0", allreduce_identifier, i);
xbt_dynar_push_as(comms, msg_comm_t,