in reply to Which is better when doing a simple match?

Why speculate? 
#!/usr/local/bin/perl -w

use Benchmark;

$count = 1_000_000;

print "Match eq => ", check_eq(), "\n";
print "Match rx => ", check_rx(), "\n";

timethese( $count, {
   'eq' => sub{ check_eq() },
   'rx' => sub{ check_rx() }
} );

sub check_eq {
   my $thing = "thing";
   my $i = 0;
   $i++ if( $thing eq "thing" );
   $i;
}

sub check_rx {
   my $thing = "thing";
   my $i = 0;
   $i++ if( $thing =~ /^thing$/ );
   $i;
}

[download]
reveals 
Match eq => 1
Match rx => 1
Benchmark: timing 1000000 iterations of eq, rx...
        eq: 15 wallclock secs (14.27 usr +  0.00 sys = 14.27 CPU) @ 70
+093.46/s (n=1000000)
        rx: 22 wallclock secs (21.08 usr +  0.00 sys = 21.08 CPU) @ 47
+430.83/s (n=1000000)

[download]

Replies are listed 'Best First'.
Re: Re: Which is better when doing a simple match?
by Cine (Friar) on Aug 22, 2001 at 00:42 UTC
    And to get the index with, and the two different cases: 
    #!/usr/local/bin/perl -w

use Benchmark;

$count = 1_000_000;
my $thing = "thing";

print "Match eq => ", check_eq(), "\n";
print "Match rx => ", check_rx(), "\n";
print "Match idx => ", check_idx(), "\n";

timethese( $count, {
   'eq' => sub{ check_eq() },
   'rx' => sub{ check_rx() },
   'idx' => sub{ check_idx() }
} );
 $thing = "asdjgfakjgfashdf___thing___asklfhklajsdhlajsdf";

print "Match eq => ", check_eq(), "\n";
print "Match rx => ", check_rx(), "\n";
print "Match idx => ", check_idx(), "\n";

timethese( $count, {
   'eq' => sub{ check_eq() },
   'rx' => sub{ check_rx() },
   'idx' => sub{ check_idx() }
} );

sub check_eq {
    ($thing eq "thing")?1:0;
}
sub check_rx {
    ($thing =~ /thing/)?1:0;
}
 $i = 0;
sub check_idx {
    ((index $thing,'thing') != -1)?1:0;
}

    [download]
    Result:

    Match eq => 1
Match rx => 1
Match idx => 1
Benchmark: timing 1000000 iterations of eq, idx, rx...
        eq:  4 wallclock secs ( 3.40 usr +  0.66 sys =  4.06 CPU) @ 24
+6305.42/s (n=1000000)
       idx:  6 wallclock secs ( 4.01 usr +  0.86 sys =  4.87 CPU) @ 20
+5338.81/s (n=1000000)
        rx:  5 wallclock secs ( 4.30 usr +  0.90 sys =  5.20 CPU) @ 19
+2307.69/s (n=1000000)
Match eq => 0
Match rx => 1
Match idx => 1
Benchmark: timing 1000000 iterations of eq, idx, rx...
        eq:  3 wallclock secs ( 3.38 usr +  0.62 sys =  4.00 CPU) @ 25
+0000.00/s (n=1000000)
       idx:  6 wallclock secs ( 4.18 usr +  1.05 sys =  5.23 CPU) @ 19
+1204.59/s (n=1000000)
        rx:  6 wallclock secs ( 4.49 usr +  1.05 sys =  5.54 CPU) @ 18
+0505.42/s (n=1000000)

    [download]


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