From f5a1a38a831e9db5a822351f3a3b138ab1cb83b3 Mon Sep 17 00:00:00 2001
From: "A. Unique TensorFlower" <gardener@tensorflow.org>
Date: Fri, 8 Jun 2018 16:46:20 -0700
Subject: Created a ThreadPoolDevice wrapper to make each op run with the
 number of threads stored in NodeDef.

PiperOrigin-RevId: 199870879
---
 tensorflow/core/framework/device_base.h |  4 ++++
 tensorflow/core/framework/op_kernel.cc  | 16 ++++++++++++++++
 tensorflow/core/framework/op_kernel.h   |  8 +++++---
 3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/tensorflow/core/framework/device_base.h b/tensorflow/core/framework/device_base.h
index ec26d92a61..b59ced869d 100644
--- a/tensorflow/core/framework/device_base.h
+++ b/tensorflow/core/framework/device_base.h
@@ -186,6 +186,10 @@ class DeviceBase {
 
   virtual ScopedAllocatorMgr* GetScopedAllocatorMgr() const { return nullptr; }
 
+  const bool has_eigen_cpu_device() const {
+    return (eigen_cpu_device_ != nullptr);
+  }
+
   virtual const Eigen::ThreadPoolDevice* eigen_cpu_device() {
     CHECK(eigen_cpu_device_ != nullptr);
     return eigen_cpu_device_;
diff --git a/tensorflow/core/framework/op_kernel.cc b/tensorflow/core/framework/op_kernel.cc
index ce213a63be..a0f449d64f 100644
--- a/tensorflow/core/framework/op_kernel.cc
+++ b/tensorflow/core/framework/op_kernel.cc
@@ -13,12 +13,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
+#define EIGEN_USE_THREADS
 #include "tensorflow/core/framework/op_kernel.h"
 
 #include <unordered_map>
 #include <utility>
 #include <vector>
 
+#include "third_party/eigen3/unsupported/Eigen/CXX11/Tensor"
 #include "tensorflow/core/framework/attr_value_util.h"
 #include "tensorflow/core/framework/device_attributes.pb.h"
 #include "tensorflow/core/framework/graph.pb_text.h"
@@ -40,6 +42,7 @@ limitations under the License.
 #include "tensorflow/core/platform/logging.h"
 #include "tensorflow/core/platform/mutex.h"
 #include "tensorflow/core/platform/types.h"
+#include "tensorflow/core/util/ptr_util.h"
 
 namespace tensorflow {
 
@@ -270,6 +273,19 @@ OpKernelContext::OpKernelContext(Params* params, int num_outputs)
   if (params_->record_tensor_accesses) {
     referenced_tensors_.Init();
   }
+  if (params->device->has_eigen_cpu_device()) {
+    int64 block_size = -1, output_size = -1, num_threads = 1;
+    const Eigen::ThreadPoolDevice* thread_pool =
+        params_->device->eigen_cpu_device();
+    AttrSlice attributes(op_kernel().def());
+    if (GetNodeAttr(attributes, "_block_size", &block_size) == Status::OK() &&
+        GetNodeAttr(attributes, "_output_size", &output_size) == Status::OK()) {
+      num_threads = std::min(Eigen::divup(output_size, block_size),
+                             static_cast<int64>(thread_pool->numThreads()));
+      eigen_cpu_device_ = MakeUnique<Eigen::ThreadPoolDevice>(
+          thread_pool->getPool(), num_threads);
+    }
+  }
 }
 
 OpKernelContext::~OpKernelContext() {
diff --git a/tensorflow/core/framework/op_kernel.h b/tensorflow/core/framework/op_kernel.h
index 5ebe6976fd..d307078e63 100644
--- a/tensorflow/core/framework/op_kernel.h
+++ b/tensorflow/core/framework/op_kernel.h
@@ -13,8 +13,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#ifndef TENSORFLOW_FRAMEWORK_OP_KERNEL_H_
-#define TENSORFLOW_FRAMEWORK_OP_KERNEL_H_
+#ifndef TENSORFLOW_CORE_FRAMEWORK_OP_KERNEL_H_
+#define TENSORFLOW_CORE_FRAMEWORK_OP_KERNEL_H_
 
 #include <functional>
 
@@ -1004,6 +1004,7 @@ class OpKernelContext {
   // OpKernels can use these eigen devices to carry out their
   // numerical computation.
   const Eigen::ThreadPoolDevice& eigen_cpu_device() const {
+    if (eigen_cpu_device_ != nullptr) return *eigen_cpu_device_;
     return *device()->eigen_cpu_device();
   }
   const Eigen::GpuDevice& eigen_gpu_device() const {
@@ -1139,6 +1140,7 @@ class OpKernelContext {
   mutable mutex mu_;  // mutable so const accessors can acquire the lock
   gtl::InlinedVector<WrappedAllocator, 4> wrapped_allocators_ GUARDED_BY(mu_);
   gtl::InlinedVector<TensorValue, 4> outputs_;
+  std::unique_ptr<Eigen::ThreadPoolDevice> eigen_cpu_device_;
 
   // Constructed only if <params->record_tensor_accesses>.
   ManualConstructor<UniqueTensorReferences> referenced_tensors_ GUARDED_BY(mu_);
@@ -1576,4 +1578,4 @@ inline void OpOutputList::set_ref(int i, mutex* mu, Tensor* tensor_for_ref) {
 
 }  // namespace tensorflow
 
-#endif  // TENSORFLOW_FRAMEWORK_OP_KERNEL_H_
+#endif  // TENSORFLOW_CORE_FRAMEWORK_OP_KERNEL_H_
-- 
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