From 0ca9c29ffef9c7ef6a05bd9d4965a93cded9b1b6 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <bsteiner@google.com>
Date: Wed, 26 Jul 2017 11:39:27 -0700
Subject: Setup a resource manager and enable the use of multiple threads
 during folding

PiperOrigin-RevId: 163233960
---
 tensorflow/core/grappler/optimizers/constant_folding.cc | 5 ++++-
 tensorflow/core/grappler/optimizers/constant_folding.h  | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/tensorflow/core/grappler/optimizers/constant_folding.cc b/tensorflow/core/grappler/optimizers/constant_folding.cc
index 7f845bb9e2..72bbaa78af 100644
--- a/tensorflow/core/grappler/optimizers/constant_folding.cc
+++ b/tensorflow/core/grappler/optimizers/constant_folding.cc
@@ -59,7 +59,7 @@ class EigenThreadPoolWrapper : public Eigen::ThreadPoolInterface {
 class DeviceSimple : public DeviceBase {
  public:
   DeviceSimple() : DeviceBase(Env::Default()) {
-    eigen_worker_threads_.num_threads = 1;
+    eigen_worker_threads_.num_threads = port::NumSchedulableCPUs();
     eigen_worker_threads_.workers = new thread::ThreadPool(
         Env::Default(), "constant_folding", eigen_worker_threads_.num_threads);
     eigen_threadpool_wrapper_.reset(
@@ -101,6 +101,8 @@ string AsControlDependency(const NodeDef& node) {
 }  // namespace
 
 ConstantFolding::ConstantFolding() {
+  resource_mgr_.reset(new ResourceMgr());
+
   ops_to_preserve_ = std::regex(
       "Placeholder.*|Const|.*Save.*|.*Restore.*|.*Reader|"
       "Enter|RefEnter|Exit|RefExit|NextIteration|RefNextIteration|"
@@ -346,6 +348,7 @@ Status ConstantFolding::EvaluateNode(const NodeDef& node,
   params.frame_iter = FrameAndIter(0, 0);
   params.inputs = &inputs;
   params.op_kernel = op_kernel.get();
+  params.resource_manager = resource_mgr_.get();
 
   gtl::InlinedVector<AllocatorAttributes, 4> output_attrs;
   const int num_outputs = op_kernel->num_outputs();
diff --git a/tensorflow/core/grappler/optimizers/constant_folding.h b/tensorflow/core/grappler/optimizers/constant_folding.h
index 1c20233345..88475e4e75 100644
--- a/tensorflow/core/grappler/optimizers/constant_folding.h
+++ b/tensorflow/core/grappler/optimizers/constant_folding.h
@@ -19,6 +19,7 @@ limitations under the License.
 #include <regex>
 #include "tensorflow/core/framework/device_base.h"
 #include "tensorflow/core/framework/op_kernel.h"
+#include "tensorflow/core/framework/resource_mgr.h"
 #include "tensorflow/core/grappler/costs/graph_properties.h"
 #include "tensorflow/core/grappler/optimizers/graph_optimizer.h"
 #include "tensorflow/core/grappler/utils.h"
@@ -70,6 +71,7 @@ class ConstantFolding : public GraphOptimizer {
   Status SimplifyGraph(GraphDef* output, const GraphProperties& properties);
 
   std::unique_ptr<DeviceBase> device_;
+  std::unique_ptr<ResourceMgr> resource_mgr_;
   GraphDef graph_;
   std::unique_ptr<NodeMap> node_map_;
   std::set<string> nodes_to_preserve_;
-- 
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