| // Copyright 2011 Google Inc. 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 "metrics.h" |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include <algorithm> |
| #include <chrono> |
| |
| #include "util.h" |
| |
| using namespace std; |
| |
| Metrics* g_metrics = NULL; |
| |
| namespace { |
| |
| /// Compute a platform-specific high-res timer value that fits into an int64. |
| int64_t HighResTimer() { |
| auto now = chrono::steady_clock::now(); |
| return chrono::duration_cast<chrono::steady_clock::duration>( |
| now.time_since_epoch()) |
| .count(); |
| } |
| |
| constexpr int64_t GetFrequency() { |
| // If numerator isn't 1 then we lose precision and that will need to be |
| // assessed. |
| static_assert(std::chrono::steady_clock::period::num == 1, |
| "Numerator must be 1"); |
| return std::chrono::steady_clock::period::den / |
| std::chrono::steady_clock::period::num; |
| } |
| |
| int64_t TimerToMicros(int64_t dt) { |
| // dt is in ticks. We want microseconds. |
| return chrono::duration_cast<chrono::microseconds>( |
| std::chrono::steady_clock::duration{ dt }) |
| .count(); |
| } |
| |
| int64_t TimerToMicros(double dt) { |
| // dt is in ticks. We want microseconds. |
| using DoubleSteadyClock = |
| std::chrono::duration<double, std::chrono::steady_clock::period>; |
| return chrono::duration_cast<chrono::microseconds>(DoubleSteadyClock{ dt }) |
| .count(); |
| } |
| |
| } // anonymous namespace |
| |
| ScopedMetric::ScopedMetric(Metric* metric) { |
| metric_ = metric; |
| if (!metric_) |
| return; |
| start_ = HighResTimer(); |
| } |
| ScopedMetric::~ScopedMetric() { |
| if (!metric_) |
| return; |
| metric_->count++; |
| // Leave in the timer's natural frequency to avoid paying the conversion cost |
| // on every measurement. |
| int64_t dt = HighResTimer() - start_; |
| metric_->sum += dt; |
| } |
| |
| Metric* Metrics::NewMetric(const string& name) { |
| Metric* metric = new Metric; |
| metric->name = name; |
| metric->count = 0; |
| metric->sum = 0; |
| metrics_.push_back(metric); |
| return metric; |
| } |
| |
| void Metrics::Report() { |
| int width = 0; |
| for (vector<Metric*>::iterator i = metrics_.begin(); |
| i != metrics_.end(); ++i) { |
| width = max((int)(*i)->name.size(), width); |
| } |
| |
| printf("%-*s\t%-6s\t%-9s\t%s\n", width, |
| "metric", "count", "avg (us)", "total (ms)"); |
| for (vector<Metric*>::iterator i = metrics_.begin(); |
| i != metrics_.end(); ++i) { |
| Metric* metric = *i; |
| uint64_t micros = TimerToMicros(metric->sum); |
| double total = micros / (double)1000; |
| double avg = micros / (double)metric->count; |
| printf("%-*s\t%-6d\t%-8.1f\t%.1f\n", width, metric->name.c_str(), |
| metric->count, avg, total); |
| } |
| } |
| |
| double Stopwatch::Elapsed() const { |
| // Convert to micros after converting to double to minimize error. |
| return 1e-6 * TimerToMicros(static_cast<double>(NowRaw() - started_)); |
| } |
| |
| uint64_t Stopwatch::NowRaw() const { |
| return HighResTimer(); |
| } |
| |
| int64_t GetTimeMillis() { |
| return TimerToMicros(HighResTimer()) / 1000; |
| } |