Maintained by: NLnet Labs

[Unbound-users] Memory Usage

Jan Komissar (jkomissa)
Thu Mar 22 04:08:12 CET 2012


Hi Paul,

AFAIK, Unbound does not free its cache memory during normal operation.
It just adds to it until the cache(s) reach(es) the specified limit,
then it makes room for more by getting rid of some old cache entries. If
an expired cache entry is found it is just ignored, and replaced when
new data is inserted into the cache. 

Hope this helps,

Jan.

> -----Original Message-----
> From: unbound-users-bounces at unbound.net [mailto:unbound-users-
> bounces at unbound.net] On Behalf Of Paul Taylor
> Sent: Wednesday, March 21, 2012 10:35 PM
> To: lst_hoe02 at kwsoft.de; unbound-users at unbound.net
> Subject: Re: [Unbound-users] Memory Usage
> 
> Sorry, I think I was in a bit of a hurry when I wrote this and didn't
> complete my thought.
> 
> I can't say what my settings are without digging into the config
> file(I'm travelling at the moment), but I wouldn't generally expect
> memory use to continuously increase.  The number of devices using this
> DNS server isn't really changing and my cache timeout is only 10
> minutes.  So, if the number of users (and presumably the number of
> queries) aren't increasing, and the cache timeout is so low that the
> overall cache size shouldn't be continuously growing, why would the
> memory usage keep going up?
> 
> Anyone else out there monitoring their Unbound usage with Cacti?  How
> does your memory usage look?
> 
> Thanks,
> Paul
> 
> -----Original Message-----
> From: unbound-users-bounces at unbound.net
> [mailto:unbound-users-bounces at unbound.net] On Behalf Of
> lst_hoe02 at kwsoft.de
> Sent: Wednesday, March 21, 2012 6:05 PM
> To: unbound-users at unbound.net
> Subject: Re: [Unbound-users] Memory Usage
> 
> Zitat von Paul Taylor <PaulTaylor at winn-dixie.com>:
> 
> > Hi,
> >
> >                 A few weeks ago, we put Unbound in as a caching
> internal
> > DNS server and we started graphing stats in Cacti within the next
> couple
> > of days.   Over the last two weeks, it appears that the memory usage
> is
> > creeping up for these metrics:
> >
> > Metric                                                   Min
> > Max
> > RRset cache memory                     6.9 M
> 56.38
> M
> > Messages cache memory             6.0 M                     59.79 M
> > Validator memory key cache      703.35 K               5.51 M
> >
> > All of these have moved up  little just about every day.
> 
> Hello
> 
> Sorry, i do not understand your question. What limits do you have in
> unbound.conf? Is it simply the fact that memory usage is raising you
> are worried about, or unbound not working within configured limits?
> 
> 
> Regards
> 
> andreas
> 
> 
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