Merge pull request #13483 from devreal/revert-tuned-barrier-tree-instead-of-bruck

Revert "tuned: use tree instead of bruck at scale"

Author: devreal

ompi/mca/coll/tuned/coll_tuned_decision_fixed.c

@@ -490,8 +490,14 @@ int ompi_coll_tuned_barrier_intra_dec_fixed(struct ompi_communicator_t *comm,
         alg = 3;
     } else if (communicator_size < 256) {
         alg = 4;
-    } else {
+    } else if (communicator_size < 512) {
+        alg = 6;
+    } else if (communicator_size < 1024) {
+        alg = 4;
+    } else if (communicator_size < 4096) {
         alg = 6;
+    } else {
+        alg = 4;
     }
 
     return ompi_coll_tuned_barrier_intra_do_this (comm, module,