dnsperf and BIND memory consumption

[JINMEI Tatuya / 神明達哉]

At Wed, 17 Dec 2008 17:07:12 -0800,
JINMEI Tatuya <Jinmei_Tatuya at isc.org> wrote:
> 
> At Mon, 15 Dec 2008 09:53:23 +0300,
> Dmitry Rybin <rybin_d at post.ru> wrote:
> 
> > Thank's to JINMEI Tatuya for support.
> > I have over 40 views, defined in named.conf, max-memory for cache -
> > 32Mb. Named daemon allocate over 2 Gb per 24 hours of work.
> 
> Each view has a separate cache DB.  So if each of these 40 views
> really needs to cache a certain amount of data, a footprint of 2GB is
> not a surprising situation, even with a 32MB of max-cache-size for
> each view.
> 
> > Have you any ideas how to limit memory usage?
> 
> Unfortunately not, unless you can consolidate the caching views to a
> small number of views.

If you can allow the multiple views to share a single cache, one
possibility is to create a separate "localhost" view as the single
caching view and forward all recursive queries to that view:

view "localhost" {
	match-clients { ::1; };
};

view "view1" {
	match-clients { view1-clients; };

	max-cache-ttl 0;  //disable caching to save memory
	zone "." {
		type forward;
		forwarders { ::1; };
		forward only;
	};
	// add other authoritative zones if necessary
};

view "view2" {
	match-clients { view2-clients; };
	max-cache-ttl 0;
	zone "." {
		type forward;
		forwarders { ::1; };
		forward only;
	};
	// add other authoritative zones if necessary
};

....

---
JINMEI, Tatuya
Internet Systems Consortium, Inc.