Today I want to compare the multiplication and division operation in Perl both could do the same, as example “100*2” is the same as “100/0.5”. And “100*0,5” is the same as “100/2”. Now let’s see what’s the Benchmark says:

#!/usr/bin/perl use strict; use Benchmark qw(:all) ; my $x = 100; my $y = 0; cmpthese(-1, { 'div' => sub {$y = $x/2}, 'mul' => sub {$y = $x*0.5}, }); cmpthese(-1, { 'div' => sub {$y = $x/0.5}, 'mul' => sub {$y = $x*2}, });

We see in bout cases the multiplication is much faster:

Rate div mul div 14234063/s -- -48% mul 27235740/s 91% -- Rate div mul div 16834936/s -- -28% mul 23301688/s 38% --

To change the divisor to a factor calculate : factor = 1/divisor.This could be also useful if you have the same divisor for some calculations.

## One thought on “Perl multiplication vs. division Benchmark”