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.

Answer 1

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");

Answer 2

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 3

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 4

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 5

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;
}