How to get the CPU Usage of each Processor in C#?

Question

I want to measure the cpu usage of each processor.

When I run the following program, I get instance name 2, 3, 0, 1, and _Total. I thought I should get 0, 1, 0,_Total, 1,_Total.

What does the result mean? How to get the total cpu usage of each processor. Not each core?

 class PerfMonitor
{
    static void Main()
    {
        var pc = new PerformanceCounter("Processor", "% Processor Time");
        var cat = new PerformanceCounterCategory("Processor");
        var instances = cat.GetInstanceNames();

        foreach (var s in instances)
        { 
            pc.InstanceName = s;
            Console.WriteLine("instance name is {0}", s);
        }
    }
}

I don't think operating systems break things down by CPU - every system monitor I've seen has only had options to see each core or to see a sum of everything. — Bobson, Jan 10 '13 at 19:25
You've got 4 processor cores so you got counters for each individual one and for the sum of them. Hard to guess what you could mean with "0,_Total". — Hans Passant, Jan 10 '13 at 19:25
maybe you have a dual core intel machine so due to hyperthreading it may be showing 4 cores and usage of each core — prthrokz, Jan 10 '13 at 19:27
As a followup, [this source](http://superuser.com/a/260029/92910) suggests there is no practical difference between multi-core and multi-CPU, so trying to group by CPU is probably irrelevant. — Bobson, Jan 10 '13 at 19:30
@hans-passant. "0,Total" is what I got something from this [link](http://stackoverflow.com/questions/2938629/how-can-i-get-cpu-load-per-core-in-c?lq=1) — ericyoung, Jan 10 '13 at 19:35
The guy probably has more than one processor in his machine. You don't. — Hans Passant, Jan 10 '13 at 19:42

ΩmegaMan · Answer 1 · 2013-01-10T19:40:39.183

1

What does the result mean?

Your result is this:

instance name is 2
instance name is 3
instance name is 0
instance name is 1
instance name is 6
instance name is 7
instance name is 4
instance name is 5
instance name is _Total

Each instance is a logical id for the processer (hyper-V logical ones included) except for the last one which is a cumulative instance of all processors on the system.

edited Jan 10 '13 at 19:40

answered Jan 10 '13 at 19:31

ΩmegaMan

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Looks to me you have 8 cores. – ericyoung Jan 10 '13 at 20:07
@ericyoung yes those are mine, it is 4 physical cores and 4 logical cores. – ΩmegaMan Jan 10 '13 at 20:09

score 0 · Accepted Answer · answered Jan 10 '13 at 19:25

0

Since Windows sees cores as processors, this is not an easy thing to do. You might start by trying to determine the number of physical CPUs, but it is a pain.

answered Jan 10 '13 at 19:25

Andy West

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score 0 · Answer 3 · answered Feb 22 '13 at 01:30

0

Download OpenHardwareMonitor, it is open source and contains a dll that you can use to do this

answered Feb 22 '13 at 01:30

Kris

1

How to get the CPU Usage of each Processor in C#?

3 Answers3