I have corrected the code. 
my @pids = map $ssh->spawn(@$_), @cmds;

[download]
is equivalent to ... 
my @pids;
for my $cmd (@cmds) {
  push @pids, $ssh->spawn(@$cmd);
}

[download]
It uses the Net::OpenSSH object passed to the sub to start all the commands in parallel.

In reply to Re^3: Running PERL SCRIPTS in Parallel by salva
in thread Running PERL SCRIPTS in Parallel by rahulruns

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