Merge branch 'add_timer' of https://github.com/guru4elephant/Paddle into add_timer

test=develop

paddle/fluid/platform/CMakeLists.txt

@@ -85,6 +85,7 @@ nv_test(cudnn_helper_test SRCS cudnn_helper_test.cc DEPS dynload_cuda)
 nv_test(transform_test SRCS transform_test.cu DEPS memory place device_context)
 
 cc_library(timer SRCS timer.cc)
+cc_test(timer_test SRCS timer_test.cc)
 
 cc_library(device_tracer SRCS device_tracer.cc DEPS boost profiler_proto framework_proto ${GPU_CTX_DEPS})
 cc_library(profiler SRCS profiler.cc DEPS device_context device_tracer)

paddle/fluid/platform/timer_test.cc

@@ -0,0 +1,34 @@
+//  Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "paddle/fluid/platform/timer.h"
+
+TEST(TimerUsage, Print) {
+  platform::Timer timeline;
+  timeline.Start();
+  sleep(3);
+  timeline.Pause();
+  std::cout << paddle::string::Sprintf("passed time %f", timeline.ElapsedSec())
+            << std::endl;
+  timeline.Reset();
+  std::cout << paddle::string::Sprintf("after reset %fs", timeline.ElapsedSec())
+            << std::endl;
+
+  std::cout << paddle::string::Sprintf("after reset %fus", timeline.ElapsedUS())
+            << std::endl;
+
+  std::cout << paddle::string::Sprintf("after reset %fms", timeline.ElapsedMS())
+            << std::endl;
+  std::cout << paddle::string::Sprintf("count is %d", timeline.Count())
+            << std::endl;
+}