Hello all,

I'm experiencing some problems with some OpenLDAP servers: the slapd process seems to always use more memory, eventually reaching a point where it has consumed all the available server memory and is killed by the OOM killer. The servers have 32gb of memory plus 32gb of swap space and are running Debian Lenny (with kernel 2.6.26-2-amd64), and we have compiled OpenLDAP 2.4.23 from source, and we're using Berkeley DB 4.6. The servers are dedicated to running OpenLDAP, so they don't have other processes that use a significant amount of memory.

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.

These are my slapd.conf and DB_CONFIG files:

--------------------------------- slapd.conf --------------------------------- disallow bind_anon require authc

#== Schemas snipped ==

pidfile /usr/local/openldap/var/run/slapd.pid argsfile /usr/local/openldap/var/run/slapd.args

loglevel 16640

modulepath /usr/local/openldap/lib/ldap/ moduleload back_bdb moduleload ppolicy moduleload syncprov

threads 8

database config rootdn "cn=admin,cn=config" rootpw {SSHA}PASS

database monitor rootdn "cn=admin,cn=monitor" rootpw {SSHA}PASS

database bdb suffix "dc=corpldap,dc=mycompany" rootdn "cn=admin,dc=corpldap,dc=mycompany" rootpw {SSHA}PASS

directory /usr/local/openldap/var/corpldap-mycompany-data overlay ppolicy overlay syncprov ppolicy_hash_cleartext syncprov-checkpoint 100 10 syncprov-sessionlog 100 monitoring on lastmod on

checkpoint 512 10

cachesize 200000 idlcachesize 600000

#== Indexes and ACLs snipped ==

serverid 1 syncrepl rid=002 provider="ldap://server02:389" searchbase="dc=corpldap,dc=mycompany" type="refreshAndPersist" retry="30 10 60 15 600 +" bindmethod=simple binddn="cn=repuser3,ou=replica,dc=corpldap,dc=mycompany" credentials="PASSWORD"

#== other syncrepl entries snipped

mirrormode on

--------------------------------- DB_CONFIG ---------------------------------

set_lg_max 10485760 set_lg_regionmax 1048576 set_lg_bsize 2097152 set_lg_dir /var/ldap/corpldap-mycompany-log set_flags DB_LOG_AUTOREMOVE set_cachesize 0 2073741824 0 set_lk_max_objects 5000 set_lk_max_locks 5000 set_lk_max_lockers 5000