Re: OpenLDAP Memory Usage

[Quanah Gibson-Mount <quanah@zimbra.com>]

--On Friday, March 18, 2011 6:29 PM -0500 Tim Mooney <Tim.Mooney@ndsu.edu> 
wrote:

> In regard to: Re: OpenLDAP Memory Usage, Quanah Gibson-Mount said (at...:
>
> > --On Thursday, March 17, 2011 8:06 AM -0700 Howard Chu <hyc@symas.com>
> > wrote:
> >
> >
> > > > This is a relatively high-volume environment, with 4 servers running
> > > > with mirrormode to enable multi-master replication. The current
> > > > database size is about 900mb. Is there any setting that could limit
> > > > this memory usage? I don't feel this is "normal" considering our DB
> > > > size and cache sizes.
> > >
> > > Very likely ITS#6660, you need to update to 2.4.24.
> >
> > Also make sure you use an alternative memory allocator if you are
> > running on  Linux, such as tcmalloc from the google perf tools package,
> > or hoard.
>
> Can you expound a bit more on that, Quanah, or point me at some more
> complete information on why using a non-default memory allocator is
> beneficial for OpenLDAP on Linux?
>
> I've been subscribed to the OpenLDAP devel and now technical mailing list
> for quite a while and I don't recall seeing anything stated in such strong
> terms about not using the default malloc/free on Linux.

It's been discussed in detail several times, but not for a few years.

I suggest reading over:

<http://www.openldap.org/pub/hyc/scale2007.pdf>

--Quanah

--

Quanah Gibson-Mount
Sr. Member of Technical Staff
Zimbra, Inc
A Division of VMware, Inc.
--------------------
Zimbra ::  the leader in open source messaging and collaboration