How do you get processor usage of each thread (or CPU core)?

Question

Is there a programmatic way to get the processor usage percent of each thread? If not, then is there a way to retrieve what each CPU core's processing usage percent is? If not that, then is there a way to retrieve what the current processor usage percent is?

I tried the following (and many other variations similar this):

 using UnityEngine;
 using System.Diagnostics;
 
 public class Stats : MonoBehaviour
 {
     PerformanceCounter cpuCounter;
     
     void Start()
     {
         cpuCounter = new PerformanceCounter("Process", "% Processor Time", Process.GetCurrentProcess().ProcessName);
     }
     
     void Update()
     {
         print("% Processor Time: " + cpuCounter.NextValue().ToString());
     }
 }

This returns:

% Processor Time: 0

Anyone know what I'm doing wrong or if there is an alternate way to do this?

Performance Monitor --> Process --> % Processor Time --> Process.GetCurrentProcess().ProcessName

And tried... Performance Monitor --> Processor --> _Total

I am using Unity Pro 4.0.0b7. I do realize there is a Stats dialog, but I would like users to be able to see stats through the stand-alone player in a custom display.

Also, I tried getting the CPU usage per core using the following:

 using UnityEngine;
 
 using System.Collections;
 using System.Diagnostics;
 using System.Collections.Generic;
 
 public class Stats : MonoBehaviour
 {
     List<PerformanceCounter> _cpuCounters = new List<PerformanceCounter>();
     
     void Start()
     {
         for (int i = 0; i < System.Environment.ProcessorCount; i++)
         {
             _cpuCounters.Add(new PerformanceCounter("Processor", "% Processor Time", i.ToString()));
         }
     }
     
     void Update()
     {
         string cpuUsage = "";
         
         for (int i = 0; i < System.Environment.ProcessorCount; i++)
         {
             cpuUsage += _cpuCounters[i].NextValue() + ", ";
         }
         
         print("cpuUsage: " + cpuUsage);
     }
 }

This resulted in the following output:

cpuUsage: 100, 100, 100, 100, 100, 100, 100, 100,

What is the correct way to get the CPU usage?

Answer 1

Answer by Dave29483 · Sep 12, 2014 at 12:07 PM

Update

     //You would create an instance per CPU/Core you want
     PerformanceCounter cpuCounter = new PerformanceCounter();

     cpuCounter.CategoryName = "Processor Information";
     cpuCounter.CounterName = "% Processor Time";
 
     //Which CPU/Core 0,0 = CPU 0, Core 0
     cpuCounter.InstanceName = "0,0";
 
     //Init - Otherwise first value would return 100 in timer
     cpuCounter.NextValue();

Then call cpuCounter.NextValue() at the frequency you desire.

Original

As far as I understand it, when you call cpuCounter.NextValue() it will return 0. It will also return 0 on subsequent calls as you haven't left enough time between samples.

So it should be like;

Call NextValue()
Wait 1000ms using Thread.Sleep() (or your sample interval)
Call NextValue()

The second call after a wait should return the true cpu time :)

May be best to use a coroutine so it doesn't hang your main thread.

Oh and setup the cpuCounter with;

cpuCounter.CategoryName = "Processor Information";

cpuCounter.CounterName = "% Processor Time";

cpuCounter.InstanceName = "_Total";

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170524_Plato · Sep 14, 2014 at 05:47 AM -1

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Still not working i did this

 System.Diagnostics.PerformanceCounter counter = new System.Diagnostics.PerformanceCounter(); 
 counter.CategoryName = "Processor"; 
 counter.CounterName = "% Processor Time"; 
 counter.InstanceName = "_Total";

and inside coroutine

 while( true ){ 
   yield return new WaitForSeconds( 1 ); 
   print( "Cpu Usage : "+counter.NextValue() ); 
 }

still it's giving 100 as output

Dave29483 · Sep 15, 2014 at 01:46 PM 0

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Just did a quick test which seems to work fine.

Also you are using category "Processor" and not "Processor Information"...

 using System;
 using System.Collections.Generic;
 using System.Component$$anonymous$$odel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.Diagnostics;
 
 namespace CPU
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }
 
         PerformanceCounter cpuCounter = new PerformanceCounter();
 
         private void button1_Click(object sender, EventArgs e)
         {

             //You would create an instance per CPU/Core you want
             cpuCounter.CategoryName = "Processor Information";
             cpuCounter.CounterName = "% Processor Time";
 
             //Which CPU/Core 0,0 = CPU 0, Core 0
             cpuCounter.InstanceName = "0,0";
 
             //Init - Otherwise first value would return 100 in timer
             cpuCounter.NextValue();
 
             timer1.Enabled = true;
         }
 
         private void timer1_Tick(object sender, EventArgs e)
         {
             Text = cpuCounter.NextValue().ToString();
         }
     }
 }

neural · Nov 05, 2015 at 12:45 PM 0

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@Dave, the question is about doing this on unity. Your code as those of others does not work on unity even though it may work on simple standalones. If anybody finds a true solution tested on unity please note that a it is still searched for. Thank you

How do you get processor usage of each thread (or CPU core)?

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