Process size versus cache size.

[Evan Hunt]

On Wed, Jul 23, 2014 at 02:15:34PM -0400, Thomas Schulz wrote:
> In investigating an out of memory error on a Solaris 8 Sparc
> machine (compiled as a 32 bit executable), I find that the process
> size increase due to the cache does not make sense.
> 
> Over about a week the process size had grown to 257 MB, up from an
> initial size of 36 MB. But when I dumped the cache with rndc dumpdb
> -cache, the resulting named_dump.db file was only 6 MB in size.
> Given the way the file is formatted, I would expect that the in
> memory version would be smaller than that.
> 
> But when I did a 'rndc flush', the process stopped growing for about
> the same number of days that it took to reach 257 MB. That indicates
> that the increase in process size really is due to the cache. The
> increase in process size from 36 MB to 257 MB does not make sense
> given that the cache dump is only 6 MB.

What version of BIND is this?  And do you use statistics-channel?  
I'd be interested to see what the memory stats look like on a running
server.

-- 
Evan Hunt -- each at isc.org
Internet Systems Consortium, Inc.