Please introduce a multi-processing library in Perl or Ruby

Question

In python we can use multiprocessing modules. If there is a similar library in Perl and Ruby, would you teach it? I would appreciate it if you can include a brief sample.

Answer 1

Have a look at this nice summary page for Perl parallel processing libs http://www.openfusion.net/perl/parallel_processing_perl_modules. I like Parallel::Forker, its a modern and more powerful library than the older Parallel::ForkManager and has more features like signalling child processes. I've used it in multiple projects and it works exactly as expected. Here's an example of how to use it:

#!/usr/bin/env perl

use strict;
use warnings;
use Parallel::Forker;

my $forker = Parallel::Forker->new(use_sig_child => 1, max_proc => 4);
$SIG{CHLD} = sub {
    Parallel::Forker::sig_child($forker);
};
$SIG{TERM} = sub {
    $forker->kill_tree_all('TERM') if $forker and $forker->in_parent;
    die "Exiting child process...\n";
};
# an example
for (1..10) {
    $forker->schedule(run_on_start => sub {
        # all child process code to run here
    })->ready();
}
# wait for all child processes to finish
$forker->wait_all();

Hope this helps you