On Linux the cpu-usage dotnet counter reports non-sense numbers in many cases.
/home/tamas/Code/Test/bin/Debug/net5.0/Test
Cpu usage via TotalProcessorTime=106.11% getrusage=107.53% EventListener= 0.00%
Cpu usage via TotalProcessorTime= 90.35% getrusage= 91.30% EventListener=176.00%
Cpu usage via TotalProcessorTime= 85.71% getrusage= 86.47% EventListener=176.00%
Cpu usage via TotalProcessorTime= 82.55% getrusage= 83.04% EventListener= 80.00%
Cpu usage via TotalProcessorTime= 81.11% getrusage= 81.40% EventListener= 36.00%
Cpu usage via TotalProcessorTime= 79.58% getrusage= 79.86% EventListener= 32.00%
Cpu usage via TotalProcessorTime= 78.41% getrusage= 78.63% EventListener= 32.00%
Cpu usage via TotalProcessorTime= 77.67% getrusage= 77.86% EventListener=260.00%
Cpu usage via TotalProcessorTime= 76.89% getrusage= 77.19% EventListener= 52.00%
Cpu usage via TotalProcessorTime= 76.50% getrusage= 76.64% EventListener= 52.00%
Cpu usage via TotalProcessorTime= 76.05% getrusage= 76.17% EventListener= 72.00%
Cpu usage via TotalProcessorTime= 75.84% getrusage= 75.90% EventListener= 80.00%
Cpu usage via TotalProcessorTime= 75.51% getrusage= 75.61% EventListener=128.00%
Cpu usage via TotalProcessorTime= 75.26% getrusage= 75.32% EventListener=128.00%
Cpu usage via TotalProcessorTime= 75.05% getrusage= 75.12% EventListener=256.00%
Cpu usage via TotalProcessorTime= 74.75% getrusage= 74.89% EventListener= 32.00%
Cpu usage via TotalProcessorTime= 74.65% getrusage= 74.73% EventListener= 32.00%
Cpu usage via TotalProcessorTime= 74.49% getrusage= 74.61% EventListener= 64.00%
Cpu usage via TotalProcessorTime= 74.42% getrusage= 74.47% EventListener=104.00%
Cpu usage via TotalProcessorTime= 74.24% getrusage= 74.34% EventListener= 40.00%
Cpu usage via TotalProcessorTime= 74.13% getrusage= 74.22% EventListener= 40.00%
Cpu usage via TotalProcessorTime= 74.02% getrusage= 74.12% EventListener= 40.00%
Cpu usage via TotalProcessorTime= 73.98% getrusage= 74.05% EventListener= 40.00%
Cpu usage via TotalProcessorTime= 73.90% getrusage= 73.95% EventListener= 40.00%
Cpu usage via TotalProcessorTime= 73.81% getrusage= 73.88% EventListener= 64.00%
Cpu usage via TotalProcessorTime= 73.89% getrusage= 73.97% EventListener=360.00%
Cpu usage via TotalProcessorTime= 73.78% getrusage= 73.88% EventListener=360.00%
Cpu usage via TotalProcessorTime= 73.73% getrusage= 73.81% EventListener= 36.00%
Cpu usage via TotalProcessorTime= 73.67% getrusage= 73.74% EventListener= 36.00%
Cpu usage via TotalProcessorTime= 73.59% getrusage= 73.67% EventListener=272.00%
Cpu usage via TotalProcessorTime= 73.56% getrusage= 73.63% EventListener=272.00%
Cpu usage via TotalProcessorTime= 73.59% getrusage= 73.64% EventListener=152.00%
Cpu usage via TotalProcessorTime= 73.55% getrusage= 73.63% EventListener=260.00%
Cpu usage via TotalProcessorTime= 73.51% getrusage= 73.58% EventListener=260.00%
Cpu usage via TotalProcessorTime= 73.49% getrusage= 73.56% EventListener= 32.00%
Cpu usage via TotalProcessorTime= 73.49% getrusage= 73.53% EventListener= 36.00%
Cpu usage via TotalProcessorTime= 73.45% getrusage= 73.49% EventListener= 36.00%
Cpu usage via TotalProcessorTime= 73.40% getrusage= 73.44% EventListener= 36.00%
Cpu usage via TotalProcessorTime= 73.37% getrusage= 73.40% EventListener= 68.00%
Cpu usage via TotalProcessorTime= 73.35% getrusage= 73.40% EventListener=276.00%
Cpu usage via TotalProcessorTime= 73.33% getrusage= 73.37% EventListener= 40.00%
Cpu usage via TotalProcessorTime= 73.27% getrusage= 73.33% EventListener= 40.00%
Cpu usage via TotalProcessorTime= 73.27% getrusage= 73.30% EventListener= 36.00%
Cpu usage via TotalProcessorTime= 73.21% getrusage= 73.27% EventListener= 80.00%
Cpu usage via TotalProcessorTime= 73.23% getrusage= 73.26% EventListener= 80.00%
Cpu usage via TotalProcessorTime= 73.25% getrusage= 73.28% EventListener= 64.00%
Cpu usage via TotalProcessorTime= 73.23% getrusage= 73.28% EventListener= 36.00%
The numbers reported by dotnet-counters collect --name=Test
Timestamp,Provider,Counter Name,Counter Type,Mean/Increment
23/11/2021 12:48:12,System.Runtime,CPU Usage (%),Metric,17
23/11/2021 12:48:12,System.Runtime,CPU Usage (%),Metric,26
23/11/2021 12:48:13,System.Runtime,CPU Usage (%),Metric,19
23/11/2021 12:48:14,System.Runtime,CPU Usage (%),Metric,15
23/11/2021 12:48:14,System.Runtime,CPU Usage (%),Metric,10
23/11/2021 12:48:15,System.Runtime,CPU Usage (%),Metric,20
23/11/2021 12:48:13,System.Runtime,CPU Usage (%),Metric,10
23/11/2021 12:48:15,System.Runtime,CPU Usage (%),Metric,10
23/11/2021 12:48:16,System.Runtime,CPU Usage (%),Metric,16
23/11/2021 12:48:17,System.Runtime,CPU Usage (%),Metric,18
23/11/2021 12:48:17,System.Runtime,CPU Usage (%),Metric,90
23/11/2021 12:48:18,System.Runtime,CPU Usage (%),Metric,20
23/11/2021 12:48:18,System.Runtime,CPU Usage (%),Metric,9
23/11/2021 12:48:19,System.Runtime,CPU Usage (%),Metric,15
23/11/2021 12:48:19,System.Runtime,CPU Usage (%),Metric,9
23/11/2021 12:48:20,System.Runtime,CPU Usage (%),Metric,20
23/11/2021 12:48:20,System.Runtime,CPU Usage (%),Metric,68
23/11/2021 12:48:21,System.Runtime,CPU Usage (%),Metric,15
23/11/2021 12:48:21,System.Runtime,CPU Usage (%),Metric,38
23/11/2021 12:48:22,System.Runtime,CPU Usage (%),Metric,19
23/11/2021 12:48:22,System.Runtime,CPU Usage (%),Metric,65
23/11/2021 12:48:23,System.Runtime,CPU Usage (%),Metric,19
23/11/2021 12:48:23,System.Runtime,CPU Usage (%),Metric,8
23/11/2021 12:48:24,System.Runtime,CPU Usage (%),Metric,14
23/11/2021 12:48:24,System.Runtime,CPU Usage (%),Metric,9
23/11/2021 12:48:25,System.Runtime,CPU Usage (%),Metric,20
23/11/2021 12:48:25,System.Runtime,CPU Usage (%),Metric,9
23/11/2021 12:48:26,System.Runtime,CPU Usage (%),Metric,17
23/11/2021 12:48:26,System.Runtime,CPU Usage (%),Metric,17
23/11/2021 12:48:27,System.Runtime,CPU Usage (%),Metric,17
23/11/2021 12:48:27,System.Runtime,CPU Usage (%),Metric,69
23/11/2021 12:48:28,System.Runtime,CPU Usage (%),Metric,19
23/11/2021 12:48:28,System.Runtime,CPU Usage (%),Metric,10
23/11/2021 12:48:29,System.Runtime,CPU Usage (%),Metric,14
23/11/2021 12:48:29,System.Runtime,CPU Usage (%),Metric,9
23/11/2021 12:48:30,System.Runtime,CPU Usage (%),Metric,20
23/11/2021 12:48:31,System.Runtime,CPU Usage (%),Metric,18
23/11/2021 12:48:31,System.Runtime,CPU Usage (%),Metric,16
23/11/2021 12:48:32,System.Runtime,CPU Usage (%),Metric,16
The number reported by dotnet-counters monitor --name=Test is always 0.
The code used to reproduce this:
using System;
using System.Threading;
using System.Diagnostics;
using System.Collections;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Diagnostics.Tracing;
namespace Test
{
public static class Program
{
public static void Main()
{
var sw = Stopwatch.StartNew();
var proc = Process.GetCurrentProcess();
var metric = new MetricsCollectorMetrics();
long dummy = 0;
while (true)
{
for (int i = 0; i < 200000000; ++i)
{
dummy += i;
}
var ru = LinuxResourceUsageInterop.GetRawUsageResources();
var cpuViaTotalProcTime = proc.TotalProcessorTime.TotalSeconds * 100.0 / sw.Elapsed.TotalSeconds;
var cpuViaRuUsage = (ru.ru_utime.tv_sec + ru.ru_utime.tv_usec / 1000.0 / 1000.0 + ru.ru_stime.tv_sec + ru.ru_stime.tv_usec / 1000.0 / 1000.0) * 100 / sw.Elapsed.TotalSeconds;
var cpuViaEventListener = metric.CpuUsage * Environment.ProcessorCount;
Console.WriteLine($"Cpu usage via TotalProcessorTime={cpuViaTotalProcTime,6:N2}%\tgetrusage={cpuViaRuUsage,6:N2}%\tEventListener={cpuViaEventListener,6:N2}%");
Thread.Sleep(200);
}
}
}
public class MetricsCollectorMetrics : EventListener
{
public float CpuUsage { get; set; }
protected override void OnEventSourceCreated(EventSource source)
{
if (!source.Name.Equals("System.Runtime", StringComparison.Ordinal))
{
return;
}
EnableEvents(source, EventLevel.Verbose, EventKeywords.All, new Dictionary<string, string> { ["EventCounterIntervalSec"] = "1" });
}
protected override void OnEventWritten(EventWrittenEventArgs eventData)
{
if (!eventData.EventName.Equals("EventCounters", StringComparison.Ordinal))
{
return;
}
foreach (var data in eventData.Payload)
{
ExtractAndSaveMetric(data);
}
}
private void ExtractAndSaveMetric(object data)
{
if (!(data is IDictionary<string, object> metricInfo) || !metricInfo.TryGetValue("Name", out var metricName))
{
return;
}
if ("cpu-usage".Equals(metricName.ToString(), StringComparison.Ordinal) && metricInfo.TryGetValue("Mean", out var cpuUsage))
{
CpuUsage = Convert.ToSingle(cpuUsage);
}
}
}
public class LinuxResourceUsageInterop
{
public static rusage GetRawUsageResources()
{
var ret = new rusage();
var result = getrusage64(RUSAGE_SELF, ref ret);
if (result != 0) {
throw new Exception("getrusage returns {result}");
}
return ret;
}
private const int RUSAGE_SELF = 0;
[DllImport("libc", SetLastError = true, EntryPoint = "getrusage")]
public static extern int getrusage64(int who, ref rusage resourceUsage);
}
[StructLayout(LayoutKind.Sequential)]
public struct timeval
{
public long tv_sec; // Number of whole seconds of elapsed time
public long tv_usec; // Number of microseconds of rest of elapsed time minus tv_sec. Always less than one million
}
[StructLayout(LayoutKind.Sequential)]
public struct rusage
{
public timeval ru_utime; /* user CPU time used */
public timeval ru_stime; /* system CPU time used */
public long ru_maxrss; /* maximum resident set size */
public long ru_ixrss; /* integral shared memory size */
public long ru_idrss; /* integral unshared data size */
public long ru_isrss; /* integral unshared stack size */
public long ru_minflt; /* page reclaims (soft page faults) */
public long ru_majflt; /* page faults (hard page faults) */
public long ru_nswap; /* swaps */
public long ru_inblock; /* block input operations */
public long ru_oublock; /* block output operations */
public long ru_msgsnd; /* IPC messages sent */
public long ru_msgrcv; /* IPC messages received */
public long ru_nsignals; /* signals received */
public long ru_nvcsw; /* voluntary context switches */
public long ru_nivcsw; /* involuntary context switches */
}
}