On Tue, Jul 07, 2009 at 11:47:51AM -0400, Wietse Venema wrote:
> Michael Durket:
> > In situations where there are tens of thousands of messages piling up in
> > the Postfix mail queue, running a 'postqueue -p' command and then
> > waiting until the last line prints isn't a very timely way to find out
> > the
> > current queue size (I'm thinking in terms of a periodic monitor like
> > Nagios for example).
> >
> > So what's the best way to quickly (i.e. less than a few seconds) get the
> > current queue count out of Postfix?
>
> Fastest: have a dedicated file system and count the number
> of used versus free inodes (df -i). This produces an
> instantaneous result regardless of the queue size (*).
>
> Slower: a suitable perl script that exploits the fact that
> directories have one-character names. I'll leave that up
> to Victor.
Code along these lines has been posted before, I believe:
# perl -e '
use strict;
use warnings;
use Symbol;
sub count {
my ($dir) = @_;
my $dh = gensym();
my $c = 0;
opendir($dh, $dir) or die "$0: opendir: $dir: $!\n";
while (my $f = readdir($dh)) {
if ($f =~ m{^[A-F0-9]{5,}$}) {
++$c;
} elsif ($f =~ m{^[A-F0-9]$}) {
$c += count("$dir/$f");
}
}
closedir($dh) or die "closedir: $dir: $!\n";
return $c;
}
my $qdir = shift(@ARGV) or die "Usage: $0 queue-directory\n";
chdir($qdir) or die "$0: chdir: $qdir: $!\n";
printf "Incoming: %d\n", count("incoming");
printf "Active: %d\n", count("active");
printf "Deferred: %d\n", count("deferred");
' /var/spool/postfix
This avoids all lstat(2) operations, reducing the system-call overhead
of counting queued messages to a minimum. The incoming queue number may
be a bit "inflated" because messages that are not yet fully received
are also counted). This overcount of the incoming queue is not generally
a problem.
--
Viktor.
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