quick n dirty code to monitor powerconsumption

powerdelta.cpp

#include <iostream>
#include <chrono>
#include <thread>
#include <fstream>

#define PATH "/sys/class/powercap/intel-rapl:0/energy_uj"

int main(void) {
	std::ifstream file(PATH);
	
	long lastJ;

	file >> lastJ;

	auto lastT = std::chrono::high_resolution_clock::now();

	file.seekg(0);

	std::this_thread::sleep_for(std::chrono::milliseconds(50));

	for (;;) {
		auto nowT = std::chrono::high_resolution_clock::now();

		long nowJ;
		file >> nowJ;

		auto deltaT = nowT - lastT;
		lastT = nowT;

		long deltaJ = nowJ - lastJ;
		lastJ = nowJ;

		std::cerr << "\b\b\b\b\b\b\b\b\b\b\b\b\b\b" << (double)deltaJ / std::chrono::duration_cast<std::chrono::microseconds>(deltaT).count() << " W ";

		file.seekg(0);

		std::this_thread::sleep_for(std::chrono::milliseconds(50));
	}

	return 0;
}