Re: restricting slapd memory consumption

[Ralf Narozny <rnarozny@web.de>]

Pierangelo Masarati schrieb:
> Ralf Narozny wrote:
> > Hi,
> >
> > Pierangelo Masarati schrieb:
> > > Buchan Milne wrote:
> > >
> > > > /me notes that it would be nice to have more detail on the entry 
> > > > cache available via back-monitor, such as the number of entries in 
> > > > the cache, and the amount of entry cache that is used ...
> > >
> > > Something like
> > >
> > > bash-3.1$ ldapsearch -x -H ldap://:9011 -b 'cn=Databases,cn=Monitor' \
> > >     '(objectclass=olmBDBDatabase)' @olmBDBDatabase
> >
> >
> > I configured the slapd to create a monitor, but the information you 
> > want is not present.
> >
> > Maybe I missed something to configure, but the manual is not too 
> > thouroughly written by now ;-)
> >
> > database monitor
> > rootdn         "cn=root,cn=monitor"
> > rootpw         {SSHA}...
> >
> > ldapsearch -D 'cn=root,cn=monitor' -W -b 'cn=Databases,cn=Monitor' 
> > 'objectclass=*' '*' '+'
> >
> > (as far as I understood, this should show all data for the entries 
> > below cn=Databases,cn=Monitor')
>
> Well, that information is only available since OpenLDAP 2.4; I infer 
> you're using an earlier distribution.  In any case, the monitor has 
> nothing to do with the entry cache configuration, it only shows the 
> current usage.  Refer to slapd.conf or back-config for what is 
> configured for your system.

Yep, as I wrote in my initial mail, we are using 2.3.32 (for testing so 
far).

And I wrote that we are using BDB which is configured to use 4GB of 
shared mem. The only problem I have is that with 1000000 entries 
configured as entry cache, slapd uses 11GB out of 16 GB of RAM after the 
insert with ldapadd. Which makes it use 7GB for entry cache (and 
whatever else).

Our entries have (in LDIF of course) an average size of below 200 Bytes. 
So taking 6GB out of the 7GB used as size of the entry cache, it would 
mean that each entry consumes about 6K of RAM. Is that correct?

If so, is there any documentation on how to configure the slapd for a 
larger amount of entries like ours?


> p.
>
>
>
> Ing. Pierangelo Masarati
> OpenLDAP Core Team
>
> SysNet s.r.l.
> via Dossi, 8 - 27100 Pavia - ITALIA
> http://www.sys-net.it
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