Change default manager to FIFO for general performance improvements.

PiperOrigin-RevId: 159626166

1 files changed, 3 insertions, 3 deletions

diff --git a/tensorflow/core/grappler/costs/virtual_scheduler.cc b/tensorflow/core/grappler/costs/virtual_scheduler.cc
index 75f485b414..f6f91e37ac 100644
--- a/tensorflow/core/grappler/costs/virtual_scheduler.cc
+++ b/tensorflow/core/grappler/costs/virtual_scheduler.cc
@@ -58,10 +58,10 @@ Costs CombineCosts(const Costs& left, const Costs& right) {
 VirtualScheduler::VirtualScheduler(const GrapplerItem* grappler_item,
                                    const bool use_static_shapes,
                                    Cluster* cluster)
-    :  // Use LIFO instead of FIFO. LIFO allows an output node of an node to
+    :  // Allow LIFO as well as FIFO. LIFO allows an output node of an node to
        // follow it in execution, saving addition memory time from having to
-       // write and read.
-      ready_nodes_(new LIFOManager()),
+       // write and read. For default cases, use FIFO for performance.
+      ready_nodes_(new FIFOManager()),
       graph_costs_(Costs::ZeroCosts()),
       graph_properties_(*grappler_item),
       cluster_(cluster),