(ITS#5722) dn cache size exceeds the limits

[p_pavlos@freemail.gr]

Full_Name: Pavlos Parissis
Version: 2.4.11
OS: Linux 2.6 RH AE 4.6
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (77.250.22.95)


Hi,


During performance testing with SLAMD we noticed the dncache exceeds the limit.
As a result the system starts to swap a lot and the responses of slapd are very
slow.

Here are the facts:

slapd.conf 
monitoring      on
tool-threads    4
cachesize       450000
dncachesize     450000
idlcachesize    450000
cachefree       90000

# ldapsearch -x -D "cn=xxxx" -w xx -b 'cn=database 2,cn=databases,cn=monitor' -s
sub '(objectclass=*)' '*' '+' | grep -i Cache

olmBDBEntryCache: 398306
olmBDBDNCache: 482001 <<==========
olmBDBIDLCache: 449999



# slapd -V
@(#) $OpenLDAP: slapd 2.4.11 (Sep 11 2008 10:58:58) $
        root@node3:/usr/src/redhat/BUILD/openldap-2.4.11/servers/slapd

#db_stat -V
Berkeley DB 4.6.21: (September 27, 2007)

# uname -r
2.6.9-67.ELsmp

# cat /etc/redhat-release
Red Hat Enterprise Linux AS release 4 (Nahant Update 6)

Cheers,
Pavlos