Re^2: Accessors in xs

Nice. If I add some other possibilities:

  PerlSubCall => sub {
    my $c = PerlMethods->new;
    for (1..100) {
      $x = PerlMethods::x($c); $y = PerlMethods::y($c);
    }
  },
  cSubCall => sub {
    my $c = CMethods->new;
    for (1..100) {
      $x = CMethods::x($c); $y = CMethods::y($c);
    }
  },
  Direct => sub {
    my $c = PerlMethods->new;
    for (1..100) {
      $x = $c->{x}; $y = $c->{y};
    },
  Fields => sub {
    my UsingFields $c = UsingFields->new;
    for (1..100) {
      $x = $c->{x}; $y = $c->{y};
    }
  }
[download]

I get these results:

              Rate PerlMethods PerlSubCall cMethods cSubCall    Direct
+    Fields
PerlMethods 1875/s          --         -4%     -64%     -72%      -80%
+      -80%
PerlSubCall 1951/s          4%          --     -62%     -70%      -79%
+      -80%
cMethods    5160/s        175%        164%       --     -22%      -44%
+      -46%
cSubCall    6596/s        252%        238%      28%       --      -29%
+      -31%
Direct      9242/s        393%        374%      79%      40%        --
+       -4%
Fields      9597/s        412%        392%      86%      45%        4%
+        --
[download]

which (unsurprisingly) shows that, if you need a massive speedup, there's no alternative to accessing the members directly. For a final iota of speed you can use the fields mechanism: the UsingFields.pm module is:

package UsingFields;
use strict;
use fields qw(x y);

sub new {
  my ($pckg, $x, $y) = @_;
  
  my $self = fields::new($pckg);
  $self->{x} = $x; $self->{y} = $y;
  
  return bless $self, $pckg;
}


sub x {
  my ($self) = @_;
  
  return $self->{x};
}


sub y {
  my ($self) = @_;
  
  return $self->{y};
}

1;
[download]

Update: Be warned that fields no longer gives any speedup with the development version of perl, and won't in 5.10 either.

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Re^3: Accessors in xs
by BrowserUk (Patriarch) on Oct 25, 2005 at 12:24 UTC

Nice++ It would be interesting to combine your benchmark and Re: Making an Object faster?.

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