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switch to a runnning calculation for stdev and mean

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Lion Kortlepel
2024-03-07 00:25:47 +01:00
parent 40533c04bc
commit 590b159f14
4 changed files with 35 additions and 39 deletions
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src/Profiling.cpp
+12 -34
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@@ -19,50 +19,28 @@ void prof::UnitProfileCollection::add_sample(const std::string& unit, const Dura
m_map->operator[](unit).add_sample(duration);
}
size_t prof::UnitExecutionTime::measurement_count() {
return m_measurements->size();
}
prof::Stats prof::UnitExecutionTime::stats() const {
Stats result {};
// calculate sum
auto measurements = m_measurements.synchronize();
if (measurements->size() == 0) {
return result;
}
result.n = measurements->size();
result.max = std::numeric_limits<double>::min();
result.min = std::numeric_limits<double>::max();
Duration sum {};
for (const auto& measurement : *measurements) {
if (measurement.count() > result.max) {
result.max = measurement.count();
}
if (measurement.count() < result.min) {
result.min = measurement.count();
}
sum += measurement;
}
// calculate mean
result.mean = (sum / measurements->size()).count();
// calculate stddev
result.stddev = 0;
for (const auto& measurement : *measurements) {
// (measurements[i] - mean)^2
result.stddev += std::pow(measurement.count() - result.mean, 2);
}
result.stddev = std::sqrt(result.stddev / double(measurements->size()));
result.total_calls = m_total_calls;
result.n = m_total_calls;
result.max = m_min;
result.min = m_max;
// calculate mean: mean = sum_x / n
result.mean = m_sum / double(m_total_calls);
// calculate stdev: stdev = sqrt((sum_x2 / n) - (mean * mean))
result.stdev = std::sqrt((m_measurement_sqr_sum / double(result.n)) - (result.mean * result.mean));
return result;
}
void prof::UnitExecutionTime::add_sample(const Duration& dur) {
m_measurements->push_back(dur);
m_sum += dur.count();
m_measurement_sqr_sum += dur.count() * dur.count();
m_min = std::min(dur.count(), m_min);
m_max = std::max(dur.count(), m_max);
++m_total_calls;
}
prof::UnitExecutionTime::UnitExecutionTime()
: m_measurements(boost::circular_buffer<Duration>(100)) {
prof::UnitExecutionTime::UnitExecutionTime() {
}
std::unordered_map<std::string, prof::Stats> prof::UnitProfileCollection::all_stats() {