Hi all,

MCE has gone through several revisions since the time the OP tested this. I tested without IO::Pty on my box. Amazingly, running (yum install perl-Net-OpenSSH) installed the package without checking the perl-IO-Tty dependency.

Workers in older MCE revisions closed STDOUT/STDERR prior to exiting. That was fix some time back.

$ ./mce_openssh.pl
child(1): doing ssh
unable to load Perl module IO::Pty: Can't locate IO/Pty.pm in @INC (@I
+NC contains: /media/psf/shm/trunk/examples/../lib /usr/local/lib64/pe
+rl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/pe
+rl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at (eval 10) lin
+e 1, <__ANONIO__> line 2.
 at /usr/share/perl5/vendor_perl/Net/OpenSSH.pm line 756.
[download]

Btw, the script works after installing IO::Tty (yum install perl-IO-Pty).

my $sshuser = 'remote_userid';
my $sshpwd  = 'remote_passwd';
my $device  = 'remote_device';

use MCE::Flow max_workers => 1;
use Net::OpenSSH;

mce_flow sub {
   my $wid = MCE->wid;

   MCE->sendto('stdout', "child($wid): doing ssh\n");

   my $ssh = Net::OpenSSH->new(
      $device,
      user => $sshuser,
      passwd => $sshpwd,
      master_opts => [-o => "StrictHostKeyChecking=no"],
      master_stderr_discard => 1
   );

   MCE->sendto('stdout', "child($wid): did ssh - not shown!!! \n");

};
[download]

In summary, STDERR output is no longer lost with current MCE releases.