Re: [Zinq-general] Patch to open data.cdb no more than once per second

On Thu, Mar 26, 2009 at 6:13 PM, Jos Backus <[email protected]> wrote:
> I thought tinydns always reopens data.cdb on every query, and this patch
> changes it to not do that as often. It makes sense to only reopen it if has
> changed (by stat()ing it), and rate-limit that. So I'm curious if there are
> cases where data.cdb is updated more than once per second - it doesn't seem
> like a good fit for a 'constant' database. Maybe I misunderstand.

The idea is to minimize the per query overhead.  I don't know that
trading a mmap/munmap per query for a stat per query would be that
great of a trade.  Reopening data.cdb only upon receipt of, say, a
SIGHUP, would be even better, but that would *really* surprise people.