Pure Perl vs Inline::C, simple function and complex function

Inline_bench.pl

#!/usr/bin/env perl
use 5.010;
use strict;
use warnings;
use Benchmark;
use Data::Dumper;

timethese(1000000, {
        perl       => sub { sub_perl(100) },
        c          => sub { sub_c(100) },
});

my @a = (1..500);
my @b = (501..1000);

#say Dumper( sub_perl_array(scalar @a, @a, @b) );
#say Dumper( sub_c_array(scalar @a, @a, @b) );

timethese(1000, {
        perl_array => sub { sub_perl_array(scalar @a, @a, @b) },
        c_array    => sub { sub_c_array(scalar @a, @a, @b) },
});


sub sub_perl {
    return $_[0]+1;
}
sub sub_perl_array {
    my ($n) = @_;
    my @ret;
    foreach (1..$n) {
        push @ret, ( $_[$_] * $_[$_+$n] );
    }
    return \@ret;
}

use Inline C => <<'END_C';

int sub_c (int i) {
    return i+1;
}

AV * sub_c_array(SV * x, ...) {
     Inline_Stack_Vars;
     long array_size, i;
     AV * ret = newAV();

     array_size = SvUV(Inline_Stack_Item(0));

/* check that array_size matches our expectations,
   based on the total number of arguments supplied */
   if(Inline_Stack_Items != (2 * array_size) + 1)
     croak("Mismatch in number of arguments supplied to foo()");

/* for efficiency, make the array big enough in one fell swoop */
     av_extend(ret, array_size - 1);

/* multiply corresponding array elements and push the result into ret +*/
     for(i = 1; i <= array_size; i++)
         av_push(ret, newSVnv(SvNV(Inline_Stack_Item(i)) *
                              SvNV(Inline_Stack_Item(i + array_size))));

     return ret;
}

END_C


__END__
<result>
Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz:
Microsoft Windows 7 Enterprise K

Benchmark: timing 1000000 iterations of c, perl...
         c:  1 wallclock secs ( 0.23 usr +  0.00 sys =  0.23 CPU) @ 4273504.27/s (n=1000000)
            (warning: too few iterations for a reliable count)
      perl:  0 wallclock secs ( 0.25 usr +  0.00 sys =  0.25 CPU) @ 4000000.00/s (n=1000000)
            (warning: too few iterations for a reliable count)
Benchmark: timing 1000 iterations of c_array, perl_array...
   c_array:  0 wallclock secs ( 0.06 usr +  0.00 sys =  0.06 CPU) @ 16129.03/s (n=1000)
            (warning: too few iterations for a reliable count)
perl_array:  1 wallclock secs ( 0.17 usr +  0.00 sys =  0.17 CPU) @ 5847.95/s (n=1000)
            (warning: too few iterations for a reliable count)

Linux 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux
          Rate perl    c
perl 2610966/s   -- -61%
c    6666667/s 155%   --
              Rate perl_array    c_array
perl_array  4219/s         --       -79%
c_array    20000/s       374%         --

Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.35-2 x86_64 GNU/Linux

Benchmark: timing 1000000 iterations of c, perl...
c: 0 wallclock secs ( 0.08 usr + 0.00 sys = 0.08 CPU) @ 12500000.00/s (n=1000000)
(warning: too few iterations for a reliable count)
perl: -1 wallclock secs ( 0.23 usr + 0.00 sys = 0.23 CPU) @ 4347826.09/s (n=1000000)
(warning: too few iterations for a reliable count)
Benchmark: timing 1000 iterations of c_array, perl_array...
c_array: 0 wallclock secs ( 0.02 usr + 0.00 sys = 0.02 CPU) @ 50000.00/s (n=1000)
(warning: too few iterations for a reliable count)
perl_array: 0 wallclock secs ( 0.11 usr + 0.00 sys = 0.11 CPU) @ 9090.91/s (n=1000)
(warning: too few iterations for a reliable count)

Intel(R) Xeon(R) CPU           X5450  @ 3.00GHz
Linux  2.6.18-348.1.1.el5xen #1 SMP Tue Jan 22 17:00:37 EST 2013 x86_64 x86_64 x86_64 GNU/Linux

         c:  0 wallclock secs ( 0.09 usr +  0.00 sys =  0.09 CPU) @ 11111111.11/s (n=1000000)
            (warning: too few iterations for a reliable count)
      perl:  1 wallclock secs ( 0.22 usr +  0.00 sys =  0.22 CPU) @ 4545454.55/s (n=1000000)
            (warning: too few iterations for a reliable count)
Benchmark: timing 1000 iterations of c_array, perl_array...
   c_array:  0 wallclock secs ( 0.04 usr +  0.00 sys =  0.04 CPU) @ 25000.00/s (n=1000)
            (warning: too few iterations for a reliable count)
perl_array:  0 wallclock secs ( 0.14 usr +  0.00 sys =  0.14 CPU) @ 7142.86/s (n=1000)
            (warning: too few iterations for a reliable count)

diff --git a/Inline_bench.pl b/Inline_bench.pl
index 02e3329..e592cff 100644
--- a/Inline_bench.pl
+++ b/Inline_bench.pl
@@ -2,10 +2,10 @@
 use 5.010;
 use strict;
 use warnings;
-use Benchmark;
+use Benchmark qw/cmpthese/;
 use Data::Dumper;

-timethese(1000000, {
+cmpthese(10000000, {
         perl       => sub { sub_perl(100) },
         c          => sub { sub_c(100) },
 });
@@ -16,7 +16,7 @@ my @b = (501..1000);
 #say Dumper( sub_perl_array(scalar @a, @a, @b) );
 #say Dumper( sub_c_array(scalar @a, @a, @b) );

-timethese(1000, {
+cmpthese(10000, {
         perl_array => sub { sub_perl_array(scalar @a, @a, @b) },
         c_array    => sub { sub_c_array(scalar @a, @a, @b) },
 });

.
├── Inline_bench.pl
└── _Inline
    ├── build
    ├── config-darwin-thread-multi-2level-5.014001
    └── lib
        └── auto
            └── Inline_bench_flymake_pl_aceb
                ├── Inline_bench_flymake_pl_aceb.bs
                ├── Inline_bench_flymake_pl_aceb.bundle
                └── Inline_bench_flymake_pl_aceb.inl

find _Inline/ | xargs file
_Inline/:                                                                           directory
_Inline//build:                                                                     directory
_Inline//config-darwin-thread-multi-2level-5.014001:                                ASCII text
_Inline//lib:                                                                       directory
_Inline//lib/auto:                                                                  directory
_Inline//lib/auto/Inline_bench_flymake_pl_aceb:                                     directory
_Inline//lib/auto/Inline_bench_flymake_pl_aceb/Inline_bench_flymake_pl_aceb.bs:     empty
_Inline//lib/auto/Inline_bench_flymake_pl_aceb/Inline_bench_flymake_pl_aceb.bundle: Mach-O 64-bit bundle x86_64
_Inline//lib/auto/Inline_bench_flymake_pl_aceb/Inline_bench_flymake_pl_aceb.inl:    ASCII text