Periodic polling of load average and check for an increase

poll_load_average.go

package main

import (
	"fmt"
	"time"

	"github.com/shirou/gopsutil/load"
)

var currentLoad *load.AvgStat

func hasLoadIncreased(old, new *load.AvgStat) bool {
	if &old == &new {
		return false
	}

	if new.Load1 > old.Load1 ||
		new.Load5 > old.Load5 ||
		new.Load15 > old.Load15 {
		return true
	}

	return false
}

func main() {
	tick := time.Tick(2 * time.Second)
	boom := time.After(1 * time.Second)

	currentLoad, _ = load.Avg()

	for {
		select {
		case <-tick:
			fmt.Printf("currentLoad = %v\n", currentLoad)

			newLoad, _ := load.Avg()
			fmt.Printf("newLoad = %v\n", newLoad)

			fmt.Printf("Increase - %v\n", hasLoadIncreased(currentLoad, newLoad))
			currentLoad = newLoad 
			time.Sleep(10 * time.Second)
		case <-boom:
			fmt.Printf("BOOM - currentLoad = %v\n", currentLoad)
			return
		default:
			fmt.Printf("DONE - currentLoad = %v\n", currentLoad)
			time.Sleep(30 * time.Second)
		}
	}
}