Well, every thread has some overhead too: 

use strict;
use warnings;
use threads;

my $str = 'x' x 32_000_000;

sub fork_wait {
    my $pid = fork;
    if ($pid) {
        wait;
    }
    else {
        exit 0;
    }
}

sub create_thread_join {
    threads->create( sub { } )->join;
}

use Benchmark qw( cmpthese );

cmpthese - 3,
  {
    Forks   => \&fork_wait,
    Threads => \&create_thread_join,
  };

__END__
          Rate Threads   Forks
Threads 27.7/s      --    -73%
Forks    103/s    272%      --

[download]

Even without this 32M string threads not win. This is Linux, perhaps on Windows you will get other result.

In reply to Re^2: while reading a file, transfer the same data to two different processes. by zwon
in thread while reading a file, transfer the same data to two different processes. by avanta

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