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linux_process_cpu_measurement_node.cpp
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linux_process_cpu_measurement_node.cpp
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// Copyright 2019 Amazon.com, Inc. or its affiliates. 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 "linux_process_cpu_measurement_node.hpp"
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <chrono>
#include <cmath>
#include <fstream>
#include <sstream>
#include <string>
#include <tuple>
#include "rcutils/logging_macros.h"
namespace
{
constexpr const char kProcStatFile[] = "/proc/stat";
constexpr const char kProc[] = "/proc/";
constexpr const char kStat[] = "/stat";
constexpr const char kMetricName[] = "_cpu_percent_used";
} // namespace
namespace system_metrics_collector
{
LinuxProcessCpuMeasurementNode::LinuxProcessCpuMeasurementNode(
const std::string & name,
const rclcpp::NodeOptions & options)
: PeriodicMeasurementNode{name, options},
metric_name_{std::to_string(GetPid()) + kMetricName}
{
}
bool LinuxProcessCpuMeasurementNode::SetupStart()
{
last_measurement_ = ProcPidCpuData();
return PeriodicMeasurementNode::SetupStart();
}
double LinuxProcessCpuMeasurementNode::PeriodicMeasurement()
{
const auto current_measurement = MakeSingleMeasurement();
const auto cpu_percentage = ComputePidCpuActivePercentage(last_measurement_, current_measurement);
last_measurement_ = current_measurement;
return cpu_percentage;
}
ProcPidCpuData LinuxProcessCpuMeasurementNode::MakeSingleMeasurement()
{
return MeasurePidCpuTime();
}
std::string LinuxProcessCpuMeasurementNode::GetMetricName() const
{
return metric_name_;
}
} // namespace system_metrics_collector