How can I get CPU Load per core (quadcore cpu), in C#?
Thanks :)
You can either use WMI or the System.Diagnostics namespace. From there you can grab any of the performance counters you wish (however it takes a second (1-1.5s) to initialize those - reading values is ok, only initialization is slow)
Code can look then like this:
using System.Diagnostics;
public static Double Calculate(CounterSample oldSample, CounterSample newSample)
{
double difference = newSample.RawValue - oldSample.RawValue;
double timeInterval = newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec;
if (timeInterval != 0) return 100*(1 - (difference/timeInterval));
return 0;
}
static void Main()
{
var pc = new PerformanceCounter("Processor Information", "% Processor Time");
var cat = new PerformanceCounterCategory("Processor Information");
var instances = cat.GetInstanceNames();
var cs = new Dictionary<string, CounterSample>();
foreach (var s in instances)
{
pc.InstanceName = s;
cs.Add(s, pc.NextSample());
}
while (true)
{
foreach (var s in instances)
{
pc.InstanceName = s;
Console.WriteLine("{0} - {1:f}", s, Calculate(cs[s], pc.NextSample()));
cs[s] = pc.NextSample();
}
System.Threading.Thread.Sleep(500);
}
}
Important thing is that you cant rely on native .net calculation for 100nsInverse performance counters (returns only 0 or 100 for me ... bug?) but you have to calculate it yourself and for that you need an archive of last CounterSamples for each instance (instances represent a core or a sum of those cores).
There appears to be a naming convetion for those instances :
0,0 - first cpu first core 0,1 - first cpu second core 0,_Total - total load of first cpu _Total - total load of all cpus
(not verified - would not recommend to rely on it untill further investigation is done)...
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