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// Copyright (C) 2019 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
//
#include "monitors/memory_monitor.h"
struct MemState {
double memTotal, usedMem, usedSwap;
};
#ifdef _WIN32
#include "monitors/query_wrapper.h"
#include <algorithm>
#define PSAPI_VERSION 2
#include <system_error>
#include <Windows.h>
#include <PdhMsg.h>
#include <Psapi.h>
namespace {
double getMemTotal() {
PERFORMANCE_INFORMATION performanceInformation;
if (!GetPerformanceInfo(&performanceInformation, sizeof(performanceInformation))) {
throw std::runtime_error("GetPerformanceInfo() failed");
}
return static_cast<double>(performanceInformation.PhysicalTotal * performanceInformation.PageSize)
/ (1024 * 1024 * 1024);
}
}
class MemoryMonitor::PerformanceCounter {
public:
PerformanceCounter() {
PDH_STATUS status = PdhAddCounterW(query, L"\\Paging File(_Total)\\% Usage", 0, &pagingFileUsageCounter);
if (ERROR_SUCCESS != status) {
throw std::system_error(status, std::system_category(), "PdhAddCounterW() failed");
}
status = PdhSetCounterScaleFactor(pagingFileUsageCounter, -2); // scale counter to [0, 1]
if (ERROR_SUCCESS != status) {
throw std::system_error(status, std::system_category(), "PdhSetCounterScaleFactor() failed");
}
}
MemState getMemState() {
PERFORMANCE_INFORMATION performanceInformation;
if (!GetPerformanceInfo(&performanceInformation, sizeof(performanceInformation))) {
throw std::runtime_error("GetPerformanceInfo() failed");
}
PDH_STATUS status;
status = PdhCollectQueryData(query);
if (ERROR_SUCCESS != status) {
throw std::system_error(status, std::system_category(), "PdhCollectQueryData() failed");
}
PDH_FMT_COUNTERVALUE displayValue;
status = PdhGetFormattedCounterValue(pagingFileUsageCounter, PDH_FMT_DOUBLE, NULL, &displayValue);
if (ERROR_SUCCESS != status) {
throw std::system_error(status, std::system_category(), "PdhGetFormattedCounterValue() failed");
}
if (PDH_CSTATUS_VALID_DATA != displayValue.CStatus && PDH_CSTATUS_NEW_DATA != displayValue.CStatus) {
throw std::runtime_error("Error in counter data");
}
double pagingFilesSize = static_cast<double>(
(performanceInformation.CommitLimit - performanceInformation.PhysicalTotal)
* performanceInformation.PageSize) / (1024 * 1024 * 1024);
return {static_cast<double>(performanceInformation.PhysicalTotal * performanceInformation.PageSize)
/ (1024 * 1024 * 1024),
static_cast<double>(
(performanceInformation.PhysicalTotal - performanceInformation.PhysicalAvailable)
* performanceInformation.PageSize) / (1024 * 1024 * 1024),
pagingFilesSize * displayValue.doubleValue};
}
private:
QueryWrapper query;
PDH_HCOUNTER pagingFileUsageCounter;
};
#elif __linux__
#include <fstream>
#include <utility>
#include <vector>
#include <regex>
namespace {
std::pair<std::pair<double, double>, std::pair<double, double>> getAvailableMemSwapTotalMemSwap() {
double memAvailable = 0, swapFree = 0, memTotal = 0, swapTotal = 0;
std::regex memRegex("^(.+):\\s+(\\d+) kB$");
std::string line;
std::smatch match;
std::ifstream meminfo("/proc/meminfo");
while (std::getline(meminfo, line)) {
if (std::regex_match(line, match, memRegex)) {
if ("MemAvailable" == match[1]) {
memAvailable = stod(match[2]) / (1024 * 1024);
} else if ("SwapFree" == match[1]) {
swapFree = stod(match[2]) / (1024 * 1024);
} else if ("MemTotal" == match[1]) {
memTotal = stod(match[2]) / (1024 * 1024);
} else if ("SwapTotal" == match[1]) {
swapTotal = stod(match[2]) / (1024 * 1024);
}
}
}
if (0 == memTotal) {
throw std::runtime_error("Can't get MemTotal");
}
return {{memAvailable, swapFree}, {memTotal, swapTotal}};
}
double getMemTotal() {
return getAvailableMemSwapTotalMemSwap().second.first;
}
}
class MemoryMonitor::PerformanceCounter {
public:
MemState getMemState() {
std::pair<std::pair<double, double>, std::pair<double, double>> availableMemSwapTotalMemSwap
= getAvailableMemSwapTotalMemSwap();
double memTotal = availableMemSwapTotalMemSwap.second.first;
double swapTotal = availableMemSwapTotalMemSwap.second.second;
return {memTotal, memTotal - availableMemSwapTotalMemSwap.first.first, swapTotal - availableMemSwapTotalMemSwap.first.second};
}
};
#else
// not implemented
namespace {
double getMemTotal() {return 0.0;}
}
class MemoryMonitor::PerformanceCounter {
public:
MemState getMemState() {return {0.0, 0.0, 0.0};}
};
#endif
MemoryMonitor::MemoryMonitor() :
samplesNumber{0},
historySize{0},
memSum{0.0},
swapSum{0.0},
maxMem{0.0},
maxSwap{0.0},
memTotal{0.0},
maxMemTotal{0.0} {}
// PerformanceCounter is incomplete in header and destructor can't be defined implicitly
MemoryMonitor::~MemoryMonitor() = default;
void MemoryMonitor::setHistorySize(std::size_t size) {
if (0 == historySize && 0 != size) {
performanceCounter.reset(new MemoryMonitor::PerformanceCounter);
// memTotal is not initialized in constructor because for linux its initialization involves constructing
// std::regex which is unimplemented and throws an exception for gcc 4.8.5 (default for CentOS 7.4).
// Delaying initialization triggers the error only when the monitor is used
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53631
memTotal = ::getMemTotal();
} else if (0 != historySize && 0 == size) {
performanceCounter.reset();
}
historySize = size;
std::size_t newSize = std::min(size, memSwapUsageHistory.size());
memSwapUsageHistory.erase(memSwapUsageHistory.begin(), memSwapUsageHistory.end() - newSize);
}
void MemoryMonitor::collectData() {
MemState memState = performanceCounter->getMemState();
maxMemTotal = std::max(maxMemTotal, memState.memTotal);
memSum += memState.usedMem;
swapSum += memState.usedSwap;
++samplesNumber;
maxMem = std::max(maxMem, memState.usedMem);
maxSwap = std::max(maxSwap, memState.usedSwap);
memSwapUsageHistory.emplace_back(memState.usedMem, memState.usedSwap);
if (memSwapUsageHistory.size() > historySize) {
memSwapUsageHistory.pop_front();
}
}
std::size_t MemoryMonitor::getHistorySize() const {
return historySize;
}
std::deque<std::pair<double, double>> MemoryMonitor::getLastHistory() const {
return memSwapUsageHistory;
}
double MemoryMonitor::getMeanMem() const {
return samplesNumber ? memSum / samplesNumber : 0;
}
double MemoryMonitor::getMeanSwap() const {
return samplesNumber ? swapSum / samplesNumber : 0;
}
double MemoryMonitor::getMaxMem() const {
return maxMem;
}
double MemoryMonitor::getMaxSwap() const {
return maxSwap;
}
double MemoryMonitor::getMemTotal() const {
return memTotal;
}
double MemoryMonitor::getMaxMemTotal() const {
return maxMemTotal;
}
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