public function parallelRun()
    {

    $url = 'D:/Programas/xampp/htdocs/robo2/tests/jesusApp.json'; // path to JSON file
    $data = file_get_contents($url); // put contents of the file into a variable
    $jesusApp = json_decode($data,true); // decode the JSON

    $numberOfTrainees = $jesusApp["numberOfTrainees"];

        $parallel = $this->taskParallelExec();

            for ($i=1;$i<=$numberOfTrainees;$i++) {

                string $args= "ola";
                $parallel->process(
                $this->taskCodecept() // use built-in Codecept task
                    ->suite('acceptance') // run acceptance tests
                    ->group("paracept_$i") // for all paracept_* groups
                    ->arg(string $args)
                    ->xml("tests/_log/result_$i.xml") // save XML results
                );
            }

    return $parallel->run();
    }