I'd say that do() is a little faster. The script that was being called/shelled out to is just a few lines and is rather irrelevant:
Benchmark: timing 100000 iterations of do, sys...
do: 4 wallclock secs ( 2.91 usr + 0.82 sys = 3.73 CPU) @ 26
+809.65/s (n=100000)
sys: 441 wallclock secs ( 1.65 usr 19.06 sys + 304.06 cusr 117.
+50 csys = 442.27 CPU) @ 226.11/s (n=100000)
Rate sys do
sys 223/s -- -99%
do 26110/s 11617% --
Benchmark script:
use warnings;
use strict;
use Benchmark qw(timethese cmpthese);
use lib '.';
timethese(
100000,
{
do => sub { do 'script.pl' },
sys => sub { system 'perl script.pl' },
}
);
cmpthese(
100000,
{
do => sub { do 'script.pl' },
sys => sub { system 'perl script.pl' },
}
);