public function getMemoryUsageData()
	{
		if (null === $this->memoryUsageData)
		{
			$memoryUsage = memory_get_usage();

			$unit = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];

			$this->memoryUsageData = [
				round($memoryUsage/pow(1024, ($i=floor(log($memoryUsage, 1024))) ), 2),
				$unit[$i]
			];
		}

		return $this->memoryUsageData;
	}