void bench_mandelbrot_single_cpu_par(
	ITimer& timer,
	Extent& ext,
	thrust::host_vector<int>& h,
	const int max_iter,
	Rectangle r
	)
{
	timer.start();
	mandelbrot_cpu_par(ext, thrust::raw_pointer_cast(&h[0]), max_iter, r);
	timer.stop();
	cout
		<< max_iter << ";"
		<< timer.delta()
		<< endl;
}