Uhm, I probably hit another dark corner: #!/usr/bin/perl
use strict;
use warnings;
use Benchmark qw( cmpthese );
cmpthese -2, {
by_substr => sub {
my $nomedir = '20070502-11';
my $anno = substr $nomedir, 0, 4;
my $mese = substr $nomedir, 4, 2;
my $giorno = substr $nomedir, 6, 2;
my $progressivo = substr $nomedir, 9, 2;
},
by_unpack => sub {
my $nomedir = '20070502-11';
my ($anno, $mese, $giorno, $progressivo)
= unpack 'A4 A2 A2 x A2', $nomedir;
},
};
poletti@PolettiX:~/sviluppo/perl$ /opt/perl-5.8.8/bin/perl numstat.pl
Rate by_unpack by_substr
by_unpack 417553/s -- -32%
by_substr 613303/s 47% --
poletti@PolettiX:~/sviluppo/perl$ /opt/perl-5.10.0/bin/perl numstat.pl
Rate by_unpack by_substr
by_unpack 372754/s -- -34%
by_substr 565358/s 52% --
poletti@PolettiX:~/sviluppo/perl$ /opt/perl-5.8.8/bin/perl numstat.pl
Rate by_unpack by_substr
by_unpack 415531/s -- -33%
by_substr 616325/s 48% --
poletti@PolettiX:~/sviluppo/perl$ /opt/perl-5.10.0/bin/perl numstat.pl
Rate by_unpack by_substr
by_unpack 374480/s -- -33%
by_substr 562716/s 50% --
poletti@PolettiX:~/sviluppo/perl$ /opt/perl-5.8.8/bin/perl numstat.pl
Rate by_unpack by_substr
by_unpack 415531/s -- -33%
by_substr 616325/s 48% --
poletti@PolettiX:~/sviluppo/perl$ /opt/perl-5.10.0/bin/perl numstat.pl
Rate by_unpack by_substr
by_unpack 369821/s -- -34%
by_substr 562716/s 52% --
I made some repeated calls just to be sure not to hit some "spots".
Update: I forgot to say that I'm under Linux, and that the two perls where compiled with the same configure options (-des for 5.8.8, and a more verbose -de for 5.10.0).
Hey! Up to Dec 16, 2007 I was named frodo72, take note of the change! Flavio
perl -ple'$_=reverse' <<<ti.xittelop@oivalf
Io ho capito... ma tu che hai detto?
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