Nvidia Jetson Nano / Xavier power monitoring

In this section, i will explain how to monitor Nano/xavier power consumption.

at first, see following links.

Jetson Nano / TX1 Software-based Power Consumption Modeling

https://docs.nvidia.com/jetson/l4t/Tegra%20Linux%20Driver%20Package%20Development%20Guide/power_management_nano.html#wwpID0E0ZE0HA

Jetson Xavier AGX / NX Software-based Power Consumption Modeling

https://docs.nvidia.com/jetson/l4t/Tegra%20Linux%20Driver%20Package%20Development%20Guide/power_management_jetson_xavier.html#wwpID0E0YF0HA

Jetson Nano provide power consumption information at “/sys/bus/i2c/drivers/ina3221x/6–0040/iio:device0/<COMMAND>”. you can replace <COMMAND> for your objective. For example, if you want to monitoring power of GPU power rail, type “cat /sys/bus/i2c/drivers/ina3221x/6–0040/iio:device0/in_power1_input” to check it.

Jetson Xavier AGX also have same step. But location was different. you can refer “/sys/bus/i2c/drivers/ina3221x/1–0040/iio:device0/<COMMAND>” to monitor your device.

And now, In my case, i need to monitoring their power consumption of every second and average power consumption. So i implement C++ to monitoring it.

Jetson Xavier AGX Software-based Power Consumption Monitoring

#include <stdlib.h>
#include <fstream>
#include <iostream>
#include <stdio.h>
#include <termio.h>
#include <unistd.h>
#include <time.h>
using namespace std;
int main(){
 ifstream gpuPowerFile,cpuPowerFile,SOCPowerFile,CVPowerFile,DDRPowerFile,SYS5VPowerFile;
 int totalCount=0;
 int sumofPower=0;
 char input=0;
 time_t start=time(NULL);
 while(true){
   string str;
   int power=0;
   int voltage=0;
   int val;
   gpuPowerFile.open("/sys/bus/i2c/drivers/ina3221x/1-0040/iio:device0/in_power0_input");
   cpuPowerFile.open("/sys/bus/i2c/drivers/ina3221x/1-0040/iio:device0/in_power1_input");
   SOCPowerFile.open("/sys/bus/i2c/drivers/ina3221x/1-0040/iio:device0/in_power2_input");
   CVPowerFile.open("/sys/bus/i2c/drivers/ina3221x/1-0041/iio:device1/in_power0_input");
   DDRPowerFile.open("/sys/bus/i2c/drivers/ina3221x/1-0041/iio:device1/in_power1_input");
   SYS5VPowerFile.open("/sys/bus/i2c/drivers/ina3221x/1-0041/iio:device1/in_power2_input");
   
   gpuPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"GPU Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
  
   cpuPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"CPU Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
   
   SOCPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"SOC Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
  
   CVPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"CV Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
  
   DDRPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"DDR Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
  
   SYS5VPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"SYS5V Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
   
   gpuPowerFile.close();
   cpuPowerFile.close();
   SOCPowerFile.close();
   CVPowerFile.close();
   DDRPowerFile.close();
   SYS5VPowerFile.close();
   cout<<"Total Power:"<<power<<"mW"<<endl;
   sumofPower+=power;
   totalCount++;
   cout<<"AveragePower: "<<sumofPower/totalCount<<endl;
   time_t end=time(NULL);
   cout<<"Time: "<<(double)(end-start)<<endl;
   sleep(1);
 }
}

It’s pretty simple. this code open information file, calculate average power consumption, and print it for every second.

Here is the other code for Jetson Nano

Jetson Nano Software-based Power Consumption Monitoring

#include <stdlib.h>
#include <fstream>
#include <iostream>
#include <stdio.h>
#include <termio.h>
#include <unistd.h>
#include <time.h>
using namespace std;
int main(){
 ifstream gpuPowerFile,cpuPowerFile,SOCPowerFile,CVPowerFile,DDRPowerFile,SYS5VPowerFile;
 int totalCount=0;
 int sumofPower=0;
 char input=0;
 time_t start=time(NULL);
 while(true){
   string str;
   int power=0;
   int voltage=0;
   int val;
   gpuPowerFile.open("/sys/bus/i2c/drivers/ina3221x/6-0040/iio:device0/in_power1_input");
   cpuPowerFile.open("/sys/bus/i2c/drivers/ina3221x/6-0040/iio:device0/in_power2_input");
   SOCPowerFile.open("/sys/bus/i2c/drivers/ina3221x/6-0040/iio:device0//in_power0_input");
   
   gpuPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"GPU Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
  
   cpuPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"CPU Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
   
   SOCPowerFile>>str;
   val=atoi(str.c_str());
   cout<<"IN Power:"<<val<<"mW"<<endl;
   power+=val;
   str.clear();
   
   gpuPowerFile.close();
   cpuPowerFile.close();
   SOCPowerFile.close();
   cout<<"Total Power:"<<power<<"mW"<<endl;
   sumofPower+=power;
   totalCount++;
   cout<<"AveragePower: "<<sumofPower/totalCount<<endl;
   time_t end=time(NULL);
   cout<<"Time: "<<(double)(end-start)<<endl;
   sleep(1);
 }
}