[Ssh-sftp-perl-users] Weird processor usage, when redirecing IO to /dev/null

[Thomas L. <ki1...@ya...>]

Hi'



I am targeting a simple perl loop, in which I with ssh->cmd will
execute a command on a remote host. This code should run in the back
ground on the mother host.



The following simple code shows my observation.



#####

use Net::SSH::Perl;



$host = Net::SSH::Perl->new("remotehost");

$host->login();



while (1) {

    print `date`;

    ($out, $err, $exit) = $host->cmd("sleep 10");

}

#####



Now, call the code test.pl and run "./test.pl". Command "top" running
in another shell on the mother host does not show anything suspicious.
Now I would like to have the code running in the background and thus I
do "./test.pl </dev/null 1>/dev/null 2>/dev/null &". Now
the "top" command shows my little program eating up one full processor.
This puzzles me very much indeed and I am speculating, if this is a bug
or a feature.



Thanks for any help in advance.



Best regards.



Thomas.


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