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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "StatisticsManager.h"
#include <wtf/DataLog.h>
#include <wtf/text/StringHash.h>
#include <wtf/text/WTFString.h>
namespace WTF {
StatisticsManager& StatisticsManager::singleton()
{
static std::once_flag onceFlag;
static StatisticsManager* instance = nullptr;
std::call_once(onceFlag, [] {
instance = new StatisticsManager();
});
return *instance;
}
void StatisticsManager::addDataPoint(ASCIILiteral id, double value)
{
Locker locker { m_lock };
m_data.add(id, Vector<double>()).iterator->value.append(value);
}
static void dumpHistogram(const AbstractLocker&, const Vector<double>& values, double min, double max, size_t binCount = 10)
{
if (values.isEmpty() || min == max)
return;
Vector<size_t> bins(binCount, 0);
double binSize = (max - min) / binCount;
for (double value : values) {
size_t index = std::min(binCount - 1, static_cast<size_t>((value - min) / binSize));
++bins[index];
}
for (size_t i = 0; i < binCount; ++i) {
double start = min + i * binSize;
double end = start + binSize;
dataLogF(" [%.2f - %.2f): %zu\n", start, end, bins[i]);
}
}
void StatisticsManager::dumpStatistics()
{
Locker locker { m_lock };
for (const auto& entry : m_data) {
const String& id = entry.key;
const Vector<double>& values = entry.value;
size_t count = values.size();
if (!count)
continue;
double sum = 0;
double sumOfSquares = 0;
double min = std::numeric_limits<double>::infinity();
double max = -min;
for (double value : values) {
sum += value;
sumOfSquares += value * value;
min = std::min(min, value);
max = std::max(max, value);
}
double mean = sum / count;
double variance = (sumOfSquares / count) - (mean * mean);
double stddev = std::sqrt(variance);
CString utf8ID = id.utf8();
dataLogF(
"Statistics for %s:\n"
" Count : %zu\n"
" Min : %.6f\n"
" Max : %.6f\n"
" Mean : %.6f\n"
" Variance : %.6f\n"
" Std Dev : %.6f\n"
" Histogram:\n",
utf8ID.data(), count, min, max, mean, variance, stddev);
dumpHistogram(locker, values, min, max);
dataLogF("\n");
}
}
void StatisticsManager::clear()
{
Locker locker { m_lock };
m_data.clear();
}
} // namespace WTF
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