Get application CPU/RAM usage from device

Unity Engine
1

Hi everyone :slight_smile:
I would like to have a debug screen in my application that shows the actual CPU/RAM usage (on the actual iOS/Android device) of the application.
Is it possible to do so using unity or do I have to write native iOS/Android plugins?

Thanks :wink:

2

I did not found something like that. For Android I currently use this link: cpu usage - Android cpu cores reported in /proc/stat - Stack Overflow
One can calculate the cpu usage using the data in /proc/stat file:

private long lastWork;
        private long lastTotal;

        private float readUsage()
        {
            // http://stackoverflow.com/questions/22405403/android-cpu-cores-reported-in-proc-stat
            try
            {

                string loadString = File.ReadAllLines("/proc/stat")[0];
                //Log.Debug("First line: %s", loadString);
                string[] toks = loadString.Replace("  ", " ").Split(' ');

                long work = long.Parse(toks[1]) + long.Parse(toks[2]) + long.Parse(toks[3]);
                long total = long.Parse(toks[1]) + long.Parse(toks[2]) + long.Parse(toks[3]) +
                        long.Parse(toks[4]) + long.Parse(toks[5])
                      + long.Parse(toks[6]) + long.Parse(toks[7]) + long.Parse(toks[8]);

                float load = (float)(work - lastWork) / ((total - lastTotal));

                if (work < 0 || total < 0 || load < 0) Log.Error("ERR Something is negative: %s %s, %s %s, %s, %s", work, lastWork, total, lastTotal, load, toks);

                lastWork = work;
                lastTotal = total;

                return load;
            }
            catch (IOException ex)
            {
                Log.Error("Error while calculating cpu usage. %s", ex);
                return -1;
            }
        }

It always uses the last reading as input for the new. So the first call will result in garbage :wink: Also you should call it in an interval, as stated in the link provided

3

What about using the ‘top’ command in android?

4

And what about memory in android by the way?

5

in file /proc/meminfo you get
MemTotal: 7998244 kB
MemFree: 6840272 kB
but i wish there was some better way to receive all this data. How this works on ios i do not know. I guess you could use top command aswell, but I went for the other way

6

That is great to get the overall ram usage, but I need my application’s Ram usage. From what I searched, it seems to be a fairly complex with no clear answer (at least to me).
And thx for your help btw:)

7

Hm, yeah maybe you can use top then, it tells you cpu% and memory i guess
I tried it now:

string bundleIdentifier = Application.bundleIdentifier;
  Process process = new Process();
  process.StartInfo.FileName = "sh";
  process.StartInfo.Arguments = "-c top | grep " + bundleIdentifier;
  process.StartInfo.UseShellExecute = false;
  process.StartInfo.RedirectStandardOutput = true;
  process.StartInfo.RedirectStandardError = true;
  process.OutputDataReceived += (sender, args) =>
  { // this is not executed in main thread, so dont use unity functions
  if (args.Data.Contains(bundleIdentifier))
  {
  Log.Debug("Stats: %s", args.Data);
  }
  Log.Debug("received output: %s", args.Data);
  };
  process.ErrorDataReceived += (sender, args) => Log.Debug("Error output: %s", args.Data);
  process.Start();
  process.BeginOutputReadLine();
  process.BeginErrorReadLine();

  if (process.HasExited)
  Log.Error("Process has already exited.");

This works, but my grep command does not work, so i filter again in data received. And you need to close/kill process when app closes, or it will still run

8

Nice :slight_smile:
Thanks