slapd high CPU usage

["Angie Cao" <angiecao88@gmail.com>]

Hi,

I am using default openldap-server-2.3.27-5 coming with red hat 5 and
I am using syncrep method to replicate with master ldap server. The
replication itself worked well, was able to replicate a large
database. but I have a severe problem that slapd process spikes high
CPU every few seconds. User time is about 85%. The whole server gets
very very slow.

I turned slapd to debug level -1 and grep for error. The only error i got was:
-----------
-Oct 16 17:32:59 ldapserver slapd[3127]: => access_allowed: backend
default search access granted to "(anonymous)"
Oct 16 17:32:59 ldapserver slapd[3127]: <= test_filter 5
Oct 16 17:32:59 ldapserver slapd[3127]: <= test_filter_and 5
Oct 16 17:32:59 ldapserver slapd[3127]: <= test_filter 5
Oct 16 17:32:59 ldapserver slapd[3127]: bdb_search: 10555 does not match filter
Oct 16 17:32:56 ldapserver slapd[3127]: ber_get_next on fd 24 failed
errno=0 (Success)
Oct 16 17:32:59 ldapserver slapd[3127]: connection_read(24): input
error=-2 id=14, closing.

Oct 16 17:35:24 ldapserver slapd[3127]: connection_read(17): input
error=-2 id=32, closing.
Oct 16 17:35:29 ldapserver slapd[3127]: connection_read(18): input
error=-2 id=36, closing.
Oct 16 17:35:32 ldapserver slapd[3127]: connection_read(18): input
error=-2 id=37, closing.
----------
(I do not know if this is related with high CPU), there was no
particular messages in /var/log/message. I have 3.2GHz CPU and 2G
memory on this server.

Has anybody had the similar problem before? Can anyone advice what can
be done in order to troubleshoot further?

Thanks.

Angie