Based on my reading of the docs, Net::OpenSSH is already forking off separate processes. I'm not sure you're getting anything by doing the child processes in parallel, why not fire off each connection in a loop. Net::OpenSSH appears to support this directly (taken from its POD, added an example for $cmd, tested): 
#!/usr/bin/perl

use strict;
use warnings;
use Net::OpenSSH;

my @hosts=( 'user@server1.com','user@server2.com','user@server3.com' )
+;
my $cmd='uptime';
my %conn = map { $_ => Net::OpenSSH->new($_) } @hosts;
my @pid;
for my $host (@hosts) {
      open my($fh), '>', "/tmp/out-$host.txt"
        or die "unable to create file: $!";
      push @pid, $conn{$host}->spawn({stdout_fh => $fh}, $cmd);
}
waitpid($_, 0) for @pid;
exit;

[download]
The spawn command directly and asynchronously runs each remote host session. I'm always leery of fork, it is probably copying all the named sockets into each child process space which is why you lose them when one child closes. (Hmm, isn't there reference counting?)

HTH,
SSF

In reply to Re: Net::OpenSSH and fork() by sflitman
in thread Net::OpenSSH and fork() by scotchie

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.