get system cpu usage in go

main.go
package main

import (
    "fmt"
    "time"

    "golang.org/x/sys/windows"
)

func main() {
    var idle, kernel, user windows.RUsage

    // Wait for some time to get accurate CPU usage
    time.Sleep(2 * time.Second)

    // Get CPU usage
    if err := windows.GetSystemTimes(&idle, &kernel, &user); err != nil {
        panic(err)
    }

    // Calculate total CPU usage
    idleTime := time.Duration(idle.Time().QuadPart)
    kernelTime := time.Duration(kernel.Time().QuadPart)
    userTime := time.Duration(user.Time().QuadPart)
    total := kernelTime + userTime

    // Calculate percentage of CPU usage
    cpuUsage := float64(total) / float64(total+idleTime) * 100

    fmt.Printf("CPU usage: %.2f%%\n", cpuUsage)
}
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