How to get total CPU % and Memory% usage on Ubuntu in using .NET core application

Question

Even PerformanceCounter is supported in .NET core, but it is not supported on the Ubuntu OS, so is there any way to get the system overall CPU and memory usage in a .NET core application (like the task manager shows in Windows)?

Answer 1

You have to rely on the OS specific utilities that provide CPU and memory information. Run the command from your application and read/parse output returned.

I found an article which looks in line with what you are trying to achieve. Reading Windows and Linux memory metrics with .NET Core

Answer 2

After some searching work, I did it by below codes (some codes are from the googling result). just FYI

  internal static class CpuMemoryMetrics4LinuxUtils
  {
    private const int DigitsInResult = 2;
    private static long totalMemoryInKb;

    /// <summary>
    /// Get the system overall CPU usage percentage.
    /// </summary>
    /// <returns>The percentange value with the '%' sign. e.g. if the usage is 30.1234 %,
    /// then it will return 30.12.</returns>
    public static double GetOverallCpuUsagePercentage()
    {
      // refer to https://stackoverflow.com/questions/59465212/net-core-cpu-usage-for-machine
      var startTime = DateTime.UtcNow;
      var startCpuUsage = Process.GetProcesses().Sum(a => a.TotalProcessorTime.TotalMilliseconds);

      System.Threading.Thread.Sleep(500);

      var endTime = DateTime.UtcNow;
      var endCpuUsage = Process.GetProcesses().Sum(a => a.TotalProcessorTime.TotalMilliseconds);

      var cpuUsedMs = endCpuUsage - startCpuUsage;
      var totalMsPassed = (endTime - startTime).TotalMilliseconds;
      var cpuUsageTotal = cpuUsedMs / (Environment.ProcessorCount * totalMsPassed);

      return Math.Round(cpuUsageTotal * 100, DigitsInResult);
    }

    /// <summary>
    /// Get the system overall memory usage percentage.
    /// </summary>
    /// <returns>The percentange value with the '%' sign. e.g. if the usage is 30.1234 %,
    /// then it will return 30.12.</returns>
    public static double GetOccupiedMemoryPercentage()
    {
      var totalMemory = GetTotalMemoryInKb();
      var usedMemory = GetUsedMemoryForAllProcessesInKb();

      var percentage = (usedMemory * 100) / totalMemory;
      return Math.Round(percentage, DigitsInResult);
    }

    private static double GetUsedMemoryForAllProcessesInKb()
    {
      var totalAllocatedMemoryInBytes = Process.GetProcesses().Sum(a => a.PrivateMemorySize64);
      return totalAllocatedMemoryInBytes / 1024.0;
    }

    private static long GetTotalMemoryInKb()
    {
      // only parse the file once
      if (totalMemoryInKb > 0)
      {
        return totalMemoryInKb;
      }

      string path = "/proc/meminfo";
      if (!File.Exists(path))
      {
        throw new FileNotFoundException($"File not found: {path}");
      }

      using (var reader = new StreamReader(path))
      {
        string line = string.Empty;
        while (!string.IsNullOrWhiteSpace(line = reader.ReadLine()))
        {
          if (line.Contains("MemTotal", StringComparison.OrdinalIgnoreCase))
          {
            // e.g. MemTotal:       16370152 kB
            var parts = line.Split(':');
            var valuePart = parts[1].Trim();
            parts = valuePart.Split(' ');
            var numberString = parts[0].Trim();

            var result = long.TryParse(numberString, out totalMemoryInKb);
            return result ? totalMemoryInKb : throw new FileFormatException($"Cannot parse 'MemTotal' value from the file {path}.");
          }
        }

        throw new FileFormatException($"Cannot find the 'MemTotal' property from the file {path}.");
      }
    }
  }