protected function printPerformanceResult($total, $runtime)
{
printf(" Total operations: %d\n", $total);
printf(" Operations per second: %01.3f [#/sec]\n", $total / $runtime);
printf(" Time per operation: %01.3f [ms]\n", $runtime / $total * 1000000);
printf(" Time taken for test: %01.3f [sec]\n", $runtime);
}