On Sun, Sep 25, 2011 at 12:55 PM, Ole Tange <[email protected]> wrote:
> > my question is about the remote portion which i'm excited about
> > using as well.
> > the catch is in the environment that i'll be using parallel:
> > 1) parallel will be available with the same path on every machine (ie
> > /foo/bar/parallel) , but /foo/bar/parallel will not be in the $PATH.
> right
> > now parallel just sshes to the remote boxes and then it fails because
> > 'parallel' is not found.
>
> You do not need GNU Parallel installed on the remote machines. It is
> used for figuring out the number of CPUs, which you can pass to it
> using the '/' notation. This command will not call parallel on
> my4coremachine:
>
> parallel -S 4/my4coremachine.example.net echo ::: bar
thanks Ole, that does work. but can this remote path for parallel be
configured so that I don't have to specify the CPUs for each host? where
would this be done in the code if not?
> > 2) the user that parallel runs as will have a read-only homedir.
>
> Since you do not need to call GNU Parallel on the remote machines I
> reckon this will not be an issue.
you're right, it seems to work just fine.
one more question for you, to get parallel ssh to work seamlessly I needed
to reconfigure the ssh parameters as follows. I didn't want to modify the
ssh preferences for the user. is there any way this can be configurable?
--- parallel 2011-09-25 13:16:47.429253000 -0400
+++ parallel.bak 2011-09-23 11:22:36.879041000 -0400
@@ -2641,9 +2641,9 @@
if($::opt_controlmaster) {
# Use control_path to make ssh faster
my $control_path = $self->control_path_dir()."/ssh-%r@%h:%p";
- $sshcmd = "ssh -n -o UserKnownHostsFile=/dev/null -o
StrictHostKeyChecking=no -S ".$control_path;
+ $sshcmd = "ssh -S ".$control_path;
$serverlogin = $self->{'string'};
- my $master = "ssh -n -o UserKnownHostsFile=/dev/null -o
StrictHostKeyChecking=no -MTS $control_path $serverlogin sleep 1";
+ my $master = "ssh -MTS $control_path $serverlogin sleep 1";
if(not $self->{'control_path'}{$control_path}++) {
# Master is not running for this control_path
# Start it
@@ -2657,7 +2657,7 @@
}
}
} else {
- $sshcmd = "ssh -n -o UserKnownHostsFile=/dev/null -o
StrictHostKeyChecking=no"; $serverlogin = $self->{'string'};
+ $sshcmd = "ssh"; $serverlogin = $self->{'string'};
}
}
$self->{'sshcommand'} = $sshcmd;
thanks
Chris
