is::saveMemoryPeak

protected function saveMemoryPeak()
{
	$mp = memory_get_peak_usage(false);

	if (!isset($this->data['memory_peak']))
	{
		$this->data['memory_peak'] = $mp;
	}
	else
	{
		if ($this->data['memory_peak'] < $mp)
		{
			$this->data['memory_peak'] = $mp;
		}
	}
}