Monitoring CPU usage over all cores for a .net application

Question

I was wondering if anyone could help with getting cpu usage information for a specific application, I am able to get the usage information identical to what you would see in the task manager using the following code

Any help would be greatly appreciated, thanks.

I have seen code such as: PerformanceCounter myAppCpu = new PerformanceCounter( "Process", "% Processor Time", "app", true); double pct = myAppCpu.NextValue(); However this gives one value for the whole cpu and not % per core which is what i am after. — Chris, Feb 20 '15 at 19:35
possible duplicate of [How can I get CPU load per core in C#?](http://stackoverflow.com/questions/2938629/how-can-i-get-cpu-load-per-core-in-c) — rducom, Feb 20 '15 at 20:12
Chris a profiler is a software to analyze code, not a code to use. — Gilad, Feb 20 '15 at 21:10
I know what a profiler is, but i need the cpu information for my program, not for debugging purposes. — Chris, Feb 21 '15 at 16:12
@Sharped - this is not a duplicate, perhaps my poor grammar didn't help but I am after cpu information specific to my application — Chris, Feb 21 '15 at 16:18

score 0 · Answer 1 · answered Feb 21 '15 at 10:12

There are two options to do this.

First one is to use WMI

    var searcher = new ManagementObjectSearcher("select * from Win32_PerfFormattedData_PerfOS_Processor");
    var cpuUsages = searcher.Get()
        .Cast<ManagementObject>()
        .Select(x => new
                      {
                          Name = x["Name"],
                          Usage = x["PercentProcessorTime"]
                      }
        )
        .ToList();

    var totalUsage = cpuUsages.Where(x => x.Name.ToString() == "_Total").Select(x => x.Usage).SingleOrDefault();

The second is to use a PerformanceCounter foreach core.

    int processorCores = new ManagementObjectSearcher("Select * from Win32_Processor").Get().Cast<ManagementBaseObject>().Sum(item => int.Parse(item["NumberOfCores"].ToString()));
    var performanceCounter = new PerformanceCounter[processorCores];
    for (var i = 0; i < processorCores; i++)
    {
        performanceCounter[i] = new PerformanceCounter("Processor", "% Processor Time", i.ToString());
    }

Correct me if i am mistaken but both of these code samples will give general cpu information (not application specific) across all cores — Chris, Feb 21 '15 at 16:14

score 0 · Answer 2 · answered Feb 21 '15 at 17:29

Many years ago I used the pdh commands to get various per process information (in my case, CPU, idle and power states). I believe they are now legacy and there is a newer updated set of APIs.

I found these examples of using performance information from the MSDN website. I haven't tried them.

One note: The names of the counters can be deceptive. Many times, I found that the counter name changed slightly from one generation of windows to the next. As a made up example, "COUNTERINFOPROCESS" might become "COUNTERINFPROCESS". There is also an API for dumping a list of the names of all counters.

Monitoring CPU usage over all cores for a .net application

2 Answers2