Re: Searches causing disk writes

[Christopher Wood <christopher_wood@pobox.com>]

Perhaps use iotop while you do a big search?

On Sat, Oct 29, 2011 at 11:11:44AM +0800, Adam Wale wrote:
> Hi,
> 
> Thanks for the response, unfortunately we are already using loglevel 0, and are not using slapd -d.
> 
> ________________________________________
> From: Hallvard Breien Furuseth [h.b.furuseth@usit.uio.no]
> Sent: Saturday, 29 October 2011 8:47 AM
> To: Adam Wale
> Cc: openldap-technical@openldap.org
> Subject: Re: Searches causing disk writes
> 
> Adam Wale writes:
> > I'm observing an issue where a large number of searches against an
> > openldap server results in a large amount of disk writes occurring.
> 
> Maybe you have set a high loglevel in slapd.conf, or you are using the
> slapd '-d' argument.
> 
> Loglevel is what gets logged to syslog.  Default logevel is 'stats'
> (256), which gives a few lines per LDAP request.  Some years ago our
> site had to set loglevel=0 because it could not handle all the
> syslogging, but a hardware upgrade fixed that.  Default syslog
> user.level=local4.debug, see man slapd.
> 
> > The hosts have plenty of free RAM and are not using any swap. I have
> > disabled the monitor backend but haven't seen much of an improvement
> > by doing this, given the monitor database is instantiated at startup
> > is this stored in memory? (if not, why not make that an option?)
> 
> Yes, monitor is memory-only.
> 
> --
> Hallvard
> 
>