Read GPU Information from Console C++ - c++

Question

I want to create my own Overclocking Monitor for which I need to read information like the current voltage, clockspeeds and others.
In C++ I can easily get the Information from Nvidia-smi with typing for example:
console("nvidia-smi -q -i voltage");
Which then displays me:
==============NVSMI LOG==============
Timestamp : Tue Dec 13 17:55:54 2022
Driver Version : 526.47
CUDA Version : 12.0
Attached GPUs : 1
GPU 00000000:01:00.0
Voltage
Graphics : 806.250 mV
From that I need only the voltage number, in this case "806.25".
I´ve investigated a bit into <cctype> which was something I´ve read about, but I´m not making any progress.
So how can I import only that number into my c++ Program? I´d just guess that the process will be the same for the other commands.

Answer 1

I don't currently have an Nvidia GPU to test this (stuck with Intel integrated graphics), so I can't import cuda.h but feel free to test this and let me know if it works or not.
#include <iostream>
#include <chrono>
#include <cuda.h>
int main() {
// Get the current timestamp
auto current_time = std::chrono::system_clock::now();
// Get the current driver version
int driver_version;
cudaDriverGetVersion(&driver_version);
// Get the current CUDA version
int cuda_version;
cudaRuntimeGetVersion(&cuda_version);
// Get the name of the attached GPU
cudaDeviceProp device_properties;
cudaGetDeviceProperties(&device_properties, 0);
std::string gpu_name = device_properties.name;
// Get the current voltage
int power_usage;
cudaDeviceGetPowerUsage(&power_usage, 0);
int voltage = power_usage / current;
// Output the overclocking data
std::cout << "Timestamp: " << current_time << std::endl;
std::cout << "Driver version: " << driver_version << std::endl;
std::cout << "CUDA version: " << cuda_version << std::endl;
std::cout << "Attached GPU: " << gpu_name << std::endl;
std::cout << "Voltage: " << voltage << std::endl;
return 0;
}
If it works then your voltage can be accessed from int voltage.