| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| #ifndef SINGA_UTILS_TIMER_H |
| #define SINGA_UTILS_TIMER_H |
| |
| #include <chrono> |
| |
| namespace singa { |
| |
| /// For benchmarking the time cost of operations. |
| class Timer { |
| public: |
| typedef std::chrono::duration<int> Seconds; |
| typedef std::chrono::duration<int, std::milli> Milliseconds; |
| typedef std::chrono::duration<int, std::ratio<60 * 60>> Hours; |
| typedef std::chrono::duration<int, std::micro> Microseconds; |
| |
| /// Init the internal time point to the current time |
| Timer() { Tick(); } |
| /// Reset the internal time point to the current time |
| void Tick() { last_ = std::chrono::high_resolution_clock::now(); } |
| /// Return the duration since last call to Tick() or since the creation of |
| /// Timer. The template arg must be from Second or Millisecond or Hour. |
| /// The returned value is the count of the time metric. |
| template <typename T = Milliseconds> |
| int Elapsed() const { |
| static_assert( |
| std::is_same<T, Seconds>::value || |
| std::is_same<T, Milliseconds>::value || |
| std::is_same<T, Hours>::value || |
| std::is_same<T, Microseconds>::value, |
| "Template arg must be Seconds | Milliseconds | Hours | Microseconds"); |
| auto now = std::chrono::high_resolution_clock::now(); |
| return std::chrono::duration_cast<T>(now - last_).count(); |
| } |
| /// Return the string rep of current wall time |
| // std::string CurrentTime(); |
| |
| private: |
| std::chrono::high_resolution_clock::time_point last_; |
| }; |
| } // namespace singa |
| #endif |