How to get CPU usage

Question

My Go program needs to know the current cpu usage percentage of all system and user processes.

How can I obtain that?

Answer 1

Here is an OS independent solution using Cgo to harness the clock() function provided by C standard library:

//#include 
import "C"
import "time"

var startTime = time.Now()
var startTicks = C.clock()

func CpuUsagePercent() float64 {
    clockSeconds := float64(C.clock()-startTicks) / float64(C.CLOCKS_PER_SEC)
    realSeconds := time.Since(startTime).Seconds()
    return clockSeconds / realSeconds * 100
}