$failure = function (Process $process, $duration) {
    throw new ProcessFailureException($process);
}

$pool = new Pool();
$pool->setOnFailure($failure);
$pool->add(new Process('sleep 100'));
$pool->add(new Process('sleep 100'));
$pool->add(new Process('sleep 100'));
$pool->add(new Process('sleep 100'));
$pool->add(new Process('sleep 100'));
$pool->run(); // blocking that will run till it finishes

$table = new Table($output);
for ($i = 0; $i < 5; $i++) {
    $time = $i + 5;
    $table->add(new Process(sprintf('for i in `seq 1 %d` ; do date ; sleep 1 ; done', $time)), ['sleep' => $time]);
}
$table->run();

$pool = new \Graze\ParallelProcess\Pool();
$pool->setMaxSimultaneous(3);
$lines = new Lines($output, $pool);
for ($i = 0; $i < 5; $i++) {
    $time = $i + 5;
    $lines->add(new Process(sprintf('for i in `seq 1 %d` ; do date ; sleep 1 ; done', $time)), ['sleep' . $time]);
}
$lines->run();