CODEWITHSUNDEEP
c#.netvisual-studioprocesscpu-usage
Lucas
Lucas

Reputation: 578

How to get total processor time in C#?

I've researched a lot but all I can find is how to get the a single process time.

Process p = exampleProcess
return p.TotalProcessorTime

How can I get the total processor time? Will I get the % CPU usage of that process if I perform:

return p/totalProcessorTime

?

Upvotes: 1

Views: 8078

Answers (3)

Hans Passant
Hans Passant

Reputation: 941218

Nah, you can't divide a Process by a Timespan. TotalProcessorTime is a measurement of how much time was actually spent executing code. It is an absolute number. If you want a relative number then you need to measure how long the process has been running. Subtract StartTime from ExitTime. Like this:

Process prc = /* something */
var wallTime = DateTime.Now - prc.StartTime;
if (prc.HasExited) wallTime = prc.ExitTime - prc.StartTime;
var procTime = prc.TotalProcessorTime;
var cpuUsage = 100 * procTime.TotalMilliseconds / wallTime.TotalMilliseconds;

Upvotes: 2

Mark Cidade
Mark Cidade

Reputation: 99957

You can use PerformanceCounter:

PerformanceCounter cpuCounter = new PerformanceCounter("Process", "% Processor Time", p.ProcessName);
double currentCpuPercent = cpuCounter.NextValue();

Upvotes: 2

David Yaw
David Yaw

Reputation: 27864

You want the total processor time, not limited to a single process, correct? Does that mean you want the processor time for all processes on the system? Wouldn't that be the same as the elapsed wall time since the system was started? If so, GetTickCount64 will do the trick.

Upvotes: 0

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