eventshell.php

<?php
namespace App\Shell;

use Cake\Console\Shell;
use Cake\Event\EventManager;

class EventShell extends Shell
{
    public function main()
    {
        $events = new EventManager();
        $start = microtime(true);
        foreach (range(1, 20) as $i) {
            $events->on('Custom.event', function () {
                return true;
            });
        }
        $end = microtime(true);
        $this->out(sprintf('Binding 20 local events took: %f', $end-$start));

        $start = microtime(true);
        foreach (range(1, 20) as $i) {
            EventManager::instance()->on('Global.event', function () {
                return true;
            });
        }
        $end = microtime(true);
        $this->out(sprintf('Binding 20 global events took: %f', $end-$start));

        $start = microtime(true);
        foreach (range(1, 1000) as $i) {
            $events->dispatch('Global.event');
        }
        $end = microtime(true);
        $this->out(sprintf('Dispatching 1000 global events took: %f', $end-$start));

        $start = microtime(true);
        foreach (range(1, 1000) as $i) {
            $events->dispatch('Custom.event');
        }
        $end = microtime(true);
        $this->out(sprintf('Dispatching 1000 local events took: %f', $end-$start));
    }
}