Implemented tensorflow::port::NominalCPUFrequency()

PiperOrigin-RevId: 174041196

tensorflow/contrib/makefile/download_dependencies.sh

@@ -26,6 +26,7 @@ NSYNC_URL="$(grep -o 'https://mirror.bazel.build/github.com/google/nsync/.*tar\.
 PROTOBUF_URL="$(grep -o 'https://mirror.bazel.build/github.com/google/protobuf/.*tar\.gz' "${BZL_FILE_PATH}" | head -n1)"
 RE2_URL="$(grep -o 'https://mirror.bazel.build/github.com/google/re2/.*tar\.gz' "${BZL_FILE_PATH}" | head -n1)"
 FFT2D_URL="$(grep -o 'http.*fft\.tgz' "${BZL_FILE_PATH}" | grep -v bazel-mirror | head -n1)"
+ABSL_URL="$(grep -o 'https://github.com/abseil/abseil-cpp/.*tar.gz' "${BZL_FILE_PATH}" | head -n1)"
 
 # TODO(petewarden): Some new code in Eigen triggers a clang bug with iOS arm64,
 #                   so work around it by patching the source.
@@ -73,6 +74,7 @@ download_and_extract "${NSYNC_URL}" "${DOWNLOADS_DIR}/nsync"
 download_and_extract "${PROTOBUF_URL}" "${DOWNLOADS_DIR}/protobuf"
 download_and_extract "${RE2_URL}" "${DOWNLOADS_DIR}/re2"
 download_and_extract "${FFT2D_URL}" "${DOWNLOADS_DIR}/fft2d"
+download_and_extract "${ABSL_URL}" "${DOWNLOADS_DIR}/absl"
 
 replace_by_sed 's#static uint32x4_t p4ui_CONJ_XOR = vld1q_u32( conj_XOR_DATA );#static uint32x4_t p4ui_CONJ_XOR; // = vld1q_u32( conj_XOR_DATA ); - Removed by script#' \
   "${DOWNLOADS_DIR}/eigen/Eigen/src/Core/arch/NEON/Complex.h"

tensorflow/core/platform/default/build_config.bzl

@@ -436,14 +436,16 @@ def tf_kernel_tests_linkstatic():
   return 0
 
 def tf_additional_lib_defines():
+  """Additional defines needed to build TF libraries."""
   return select({
       "//tensorflow:with_jemalloc_linux_x86_64": ["TENSORFLOW_USE_JEMALLOC"],
       "//tensorflow:with_jemalloc_linux_ppc64le":["TENSORFLOW_USE_JEMALLOC"],
       "//conditions:default": [],
-  })
+  }) + if_not_mobile(["TENSORFLOW_USE_ABSL"])
 
 def tf_additional_lib_deps():
-  return if_static(
+  """Additional dependencies needed to build TF libraries."""
+  return if_not_mobile(["@com_google_absl//absl/base:base"]) + if_static(
       ["@nsync//:nsync_cpp"],
       ["@nsync//:nsync_headers"]
   ) + select({

tensorflow/core/platform/posix/port.cc

@@ -17,11 +17,16 @@ limitations under the License.
 #include "jemalloc/jemalloc.h"
 #endif
 
+#ifdef TENSORFLOW_USE_ABSL
+#include "absl/base/internal/sysinfo.h"
+#endif
+
 #include "tensorflow/core/platform/cpu_info.h"
 #include "tensorflow/core/platform/logging.h"
 #include "tensorflow/core/platform/mem.h"
 #include "tensorflow/core/platform/snappy.h"
 #include "tensorflow/core/platform/types.h"
+
 #if defined(__linux__) && !defined(__ANDROID__)
 #include <sched.h>
 #endif
@@ -157,8 +162,11 @@ bool Snappy_Uncompress(const char* input, size_t length, char* output) {
 string Demangle(const char* mangled) { return mangled; }
 
 double NominalCPUFrequency() {
-  // TODO(yuefengz): implement it for this platform.
+#ifdef TENSORFLOW_USE_ABSL
+  return absl::base_internal::NominalCPUFrequency();
+#else
   return 1.0;
+#endif
 }
 
 }  // namespace port

tensorflow/workspace.bzl

@@ -181,6 +181,16 @@ def tf_workspace(path_prefix="", tf_repo_name=""):
       build_file = str(Label("//third_party/mkl_dnn:mkldnn.BUILD")),
   )
 
+  native.http_archive(
+      name = "com_google_absl",
+      urls = [
+          "https://mirror.bazel.build/github.com/abseil/abseil-cpp/archive/cc4bed2d74f7c8717e31f9579214ab52a9c9c610.tar.gz",
+          "https://github.com/abseil/abseil-cpp/archive/cc4bed2d74f7c8717e31f9579214ab52a9c9c610.tar.gz",
+      ],
+     sha256 = "f1a7349f88d2846210c42e2f7271dabeee404c2a3b4198e34a797993e3569b03",
+     strip_prefix = "abseil-cpp-cc4bed2d74f7c8717e31f9579214ab52a9c9c610",
+  )
+
   native.new_http_archive(
       name = "eigen_archive",
       urls = [