On Friday 25 April 2008 11:28:44 Mikel.Santos@idom.com wrote:
Hi guys,
First of all, I would like to thank the community for such a great piece of software and encourage the developers to keep up the good work.
Until now, the setup of the ldap and the file configuration has been pretty straightforward. The ldap was performing great with few entries, but things got worse as the number of entries in the ldap increased. Currently we are experiencing serious performance problems when the searches performed exceed certain amount of entries. The "ldap_search" calls usually return after a few seconds but as the number of results matching the filter entered increases, the waiting time varies from one minute to many minutes.
This would appear to be a client-side problem. In my experience, the performance (rate at which entries are returned, minus overhead of connection setup) on an LDAP server will degrade as the number of entries in the database increases, not as the number of entries returned increases (assuming your cache is not interfering).
The scenario is the following:
- We are accessing openldap via PHP function calls
I think you should test via some other method to ensure that PHP is not the bottleneck. For example, maybe the amount of memory available to PHP is not sufficient for the number of entries you are returning.
You can easily determine this by running the ldapsearch utility with equivalent parameters to your php case. To eliminate any IO issues, redirect the results to /dev/null, e.g.:
$ time ldapsearch -x -D $binddn -b $basedn -w $pass -z $entries >/dev/null
(set the environment variables appropriately or replace them)
- The number of entries in the ldap is close to 100.000
- The hardware is the following: Intel(R) Xeon(TM) CPU 3.33GHz 1Gb RAM
- The slapd.conf file is the following:
/************************************************************************** **********************************/ modulepath /usr/lib/ldap moduleload back_bdb sizelimit -1 tool-threads 1 backend bdb checkpoint 512 30 database bdb directory "/var/lib/ldap" dbconfig set_cachesize 0 2097152 0 cachesize 100000 /************************************************************************** **********************************/
We have tried to increase both set_cachesize and cachesize (multiplying both by 100) and have not noticed a performance increase. I hope any of you can point us in the right direction since we are beginning to get desperated...
Unless you can reproduce the problem without php, I point you in the direction of php ...
Regards, Buchan