view release on metacpan or  search on metacpan

lib/PDL/NDBin.pm  view on Meta::CPAN

=head1 PERFORMANCE

=head2 One-dimensional histograms

This section aims to give an idea of the performance of PDL::NDBin. Some of the
most important features of PDL::NDBin aren't found in other modules on CPAN.
But there are a few histogramming modules on CPAN, and it is interesting to
examine how well PDL::NDBin does in comparison.

I've run a number of tests with PDL version 0.008 on a laptop with an Intel i3
CPU running at 2.40 GHz, and on a desktop with an Intel i7 CPU running at 2.80
GHz and fast disks. The following table, obtained with 100 bins and a data file
of 2 million data points, shows typical results on the laptop:

	Benchmark: timing 50 iterations of MGH, MH, MSHXS, PND, hist, histogram...
	       MGH: 42 wallclock secs (42.48 usr +  0.05 sys = 42.53 CPU) @  1.18/s (n=50)
	        MH:  6 wallclock secs ( 5.53 usr +  0.00 sys =  5.53 CPU) @  9.04/s (n=50)
	     MSHXS:  2 wallclock secs ( 2.21 usr +  0.01 sys =  2.22 CPU) @ 22.52/s (n=50)
	       PND:  2 wallclock secs ( 1.40 usr +  0.00 sys =  1.40 CPU) @ 35.71/s (n=50)
	      hist:  1 wallclock secs ( 1.09 usr +  0.00 sys =  1.09 CPU) @ 45.87/s (n=50)
	 histogram:  1 wallclock secs ( 1.08 usr +  0.00 sys =  1.08 CPU) @ 46.30/s (n=50)