Process::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;
		}
	}