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.
With Perl, you have options. One option is to use processes as below. I need to look up how to write the analogous program using threads but http://perldoc.perl.org/perlthrtut.html should give you an idea.
#!/usr/bin/perl
use strict;
use warnings;
use Parallel::ForkManager;
my @data = (0 .. 19);
my $pm = Parallel::ForkManager->new(4);
for my $n ( @data ) {
my $pid = $pm->start and next;
warn sprintf "%d^3 = %d\n", $n, slow_cube($n);
$pm->finish;
}
sub slow_cube {
my ($n) = @_;
sleep 1;
return $n * $n * $n;
}
__END__
The following version using threads does not use a limit on the number of threads created (because I do not know how):
#!/usr/bin/perl
use strict;
use warnings;
use threads;
my @data = (0 .. 19);
my @threads = map {
threads->new( {context => 'list' }, \&slow_cube, $_ )
} @data;
for my $thr ( @threads ) {
my ( $n, $ncubed ) = $thr->join;
print "$n^3 = $ncubed\n";
}
sub slow_cube {
my ($n) = @_;
sleep 1;
return $n, $n * $n * $n;
}
__END__
Interestingly:
TimeThis : Command Line : t.pl
TimeThis : Elapsed Time : 00:00:01.281