GPIO read performance test

main.go

package main

import (
	"fmt"
	"runtime/debug"
	"sort"
	"time"

	"periph.io/x/periph/conn/gpio/gpioreg"
	"periph.io/x/periph/host"
)

func main() {
	_, err := host.Init()
	if err != nil {
		fmt.Println("HostInit error:", err)
		return
	}

	pin := gpioreg.ByName("GPIO4")
	if pin == nil {
		fmt.Println("Pin is nil")
		return
	}

	start := time.Now()
	durations := make([]int, 10000)
	gcPercent := debug.SetGCPercent(-1)
	numberReads := 0

	for {
		readStart := time.Now()
		pin.Read()
		durations = append(durations, int(time.Since(readStart)/time.Nanosecond))
		numberReads++
		if time.Since(start) > 10*time.Millisecond {
			break
		}
	}
	debug.SetGCPercent(gcPercent)

	sort.Ints(durations)
	fmt.Println("n reads:", numberReads)
	fmt.Println("avg read duration", 10000.0/float64(numberReads))
	fmt.Println("duration", time.Since(start))
	fmt.Println("max read durations (ns):", durations[len(durations)-6:])
}