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// Copyright 2009-present MongoDB, Inc.
//
// 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.
#pragma once
#include <chrono>
#include <ctime>
#include <vector>
namespace benchmark {
class score_recorder {
public:
score_recorder() = delete;
score_recorder(double task_size);
//
// Starts the timer for a single iteration (sample) of the benchmark.
//
void start_sample();
//
// Stops the timer and stores the time of the previous sample.
//
// @note
// This method should only be run once after a call to start_sample().
//
void end_sample();
//
// Returns the cumulative wall clock execution time of all samples that have been run.
//
// @return
// The cumulative execution time.
//
const std::chrono::milliseconds& get_execution_time() const;
//
// Gets the nth percentile sample runtime.
//
// @return
// The "nth" percentile recorded sample time.
//
// @exception
// A runtime error is thrown if this method is called before any samples have been recorded.
//
// @note
// This method should only be called after all samples are completed.
//
const std::chrono::milliseconds& get_percentile(unsigned long n);
//
// Gets the score for this benchmark.
//
// @return
// The score for this benchmark in MB/s.
//
// @exception
// A runtime error is thrown if this method is called before any samples have been recorded.
//
// @note
// This method should only be called after all samples are completed.
//
double get_score();
private:
std::chrono::time_point<std::chrono::high_resolution_clock> _last_start;
std::chrono::milliseconds _execution_time;
bool _sorted;
double _task_size;
std::vector<std::chrono::milliseconds> _samples;
};
} // namespace benchmark
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