How to get CPU usage for more than 2 cores?

Question

I try to get in my program CPU usage divided by a cores. Now I use the PerformanceCounter and changing the InstanceName between 0 and 1 I have the data from 2 cores.

PerformanceCounter pc0 = new PerformanceCounter("Processor", "% Processor Time", "0");
PerformanceCounter pc1 = new PerformanceCounter("Processor", "% Processor Time", "1");

How I can get core usage for 3rd, 4th core etc.?

Does anyone can help me?

Thanks

Answer 1

Some thing like this should also work for your requirement

  public List<string> GetServerStatus()
   {
        List<string> cpuStatus = new List<string>();
        ObjectQuery wmicpus = new WqlObjectQuery("SELECT * FROM Win32_Processor");
        ManagementObjectSearcher cpus = new ManagementObjectSearcher(wmicpus);
        try
        {
            int coreCount = 0;
            int totusage = 0;               
            foreach (ManagementObject cpu in cpus.Get())
            {
                //cpuStatus.Add(cpu["DeviceId"] + " = " + cpu["LoadPercentage"]);
                coreCount += 1;
                totusage += Convert.ToInt32(cpu["LoadPercentage"]);
            }
            if (coreCount > 1)
            {
                double ActUtiFloat = totusage / coreCount;
                int ActUti = Convert.ToInt32(Math.Round(ActUtiFloat));
                //Utilisation = ActUti + "%";
                cpuStatus.Add("CPU = " + ActUti);
            }
            else
            {
                cpuStatus.Add("CPU = " + totusage);
            }



        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            cpus.Dispose();
        }            

        return cpuStatus;
    }

Answer 2

I suspect that what you are really asking is "How do I count the number of cores?". This code will count the number of cores, and then create performance counters based on that.

        int coreCount = 0;
        foreach (var item in new System.Management.ManagementObjectSearcher("Select * from Win32_Processor").Get())
        {
            coreCount += int.Parse(item["NumberOfCores"].ToString());
        }

        PerformanceCounter[] pc = new PerformanceCounter[coreCount];

        for (int i = 0; i < coreCount; i++)
        {
            pc[i] = new PerformanceCounter("Processor", "% Processor Time", i.ToString());
            Console.WriteLine(pc[i].CounterName);
        }

Answer 3

This might be an old question, but for anyone else looking for a different solution, why don't you use System.Environment?

    public static List<System.Diagnostics.PerformanceCounter> GetPerformanceCounters()
    {
        List<System.Diagnostics.PerformanceCounter> performanceCounters = new List<System.Diagnostics.PerformanceCounter>();
        int procCount = System.Environment.ProcessorCount;
        for (int i = 0; i < procCount; i++)
        {
            System.Diagnostics.PerformanceCounter pc = new System.Diagnostics.PerformanceCounter("Processor", "% Processor Time", i.ToString());
            performanceCounters.Add(pc);
        }
        return performanceCounters;
    }

EDIT: I noticed this only returns the amount of logical processors, not the actual core count.

Answer 4

foreach (var item in new System.Management.ManagementObjectSearcher("Select NumberOfLogicalProcessors from Win32_Processor").Get())
                {
                    coreCount += int.Parse(item["NumberOfLogicalProcessors"].ToString());
                }

                PerformanceCounter[] pc = new PerformanceCounter[coreCount];

                for (int i = 0; i < coreCount; i++)
                {
                    pc[i] = new PerformanceCounter("Processor", "% Processor Time", i.ToString());

                }

Answer 5

I havent used PerformanceCounter before but is there something wrong with doing this?

PerformanceCounter pc0 = new PerformanceCounter("Processor", "% Processor Time", "0");
PerformanceCounter pc1 = new PerformanceCounter("Processor", "% Processor Time", "1");
PerformanceCounter pc2 = new PerformanceCounter("Processor", "% Processor Time", "2");
PerformanceCounter pc3 = new PerformanceCounter("Processor", "% Processor Time", "3");