...using strict creates overhead although it's not an optimization to write home about.

I assume you're referring to the runtime check for symbolic references, as that is the only run-time component for stricture? 

$ perl -MO=Deparse -e '{use strict; my $a = 1}'
{
    use strict 'refs';
    my $a = 1;
}

[download]

Well, I've taken the liberty of benchmarking the use of strict refs, and I must say it's a meager optimization indeed. I ran this code on a (new) completely unloaded machine: it would seem to me that the difference is noticable, but seems to be drowned out by noise almost completely. 

use Benchmark qw(:all);
cmpthese( 10000000, {
   with => sub {use strict 'refs'; my $a = 1; my $b = 2},
   without => sub {my $a = 1; my $b = 2},
} );
__END__
             Rate    with without
with    3378378/s      --     -7%
without 3623188/s      7%      --

             Rate without    with
without 3802281/s      --     -3%
with    3937008/s      4%      --

             Rate    with without
with    3412969/s      --    -15%
without 4032258/s     18%      --

             Rate    with without
with    4048583/s      --     -3%
without 4166667/s      3%      --

             Rate    with without
with    3460208/s      --     -9%
without 3787879/s      9%      --

[download]

It would seem to me that if you need this type of optimization, you'd better start coding parts of your program in C ;-). So I wouldn't remove "use strict" from a production script for this reason: the likelyhood of a "quick hack" in the future on that production script messing up things without warning, would be just too great for me, from a sysadmin point of view.

Liz

In reply to Re: Re: to strict or not to strict by liz
in thread to strict or not to strict by castaway

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