2010/3/12 Dieter Kluenter <dieter@dkluenter.de>

Echedey Lorenzo <echedey@gmail.com> writes:

> Hi,
>
> Soon I'll have a x64 Suse machine with 16GB RAM and 4 Intel Cores. We
> need our OpenLDAP Server to be as fast as possible. I wonder which
> DB_CONFIG values are suitable for this. Maybe...
>
> set_cachesie 14 0 4 set_lg_regionmax 262144 set_lg_bsize 2097152
> set_flags DB_LOG_AUTOREMOVE
>
> ...?
>
> Directory will have around 6~8 million entries. I'm not sure if they
> will be entirely uploaded to the RAM cache, but at least part of will
> improve speed, I think.
>
> Any help will be appreciated since my experiences with OpenLDAP
> performance against Sun Directory Server 5.2 has not been good, taking
> several seconds to answer any ldaprequest :(

huh, time ldapsearch -x -LLL -H ldap://localhost -b
ou=benchmark,o=avci,c=de -s one sn=xxx telephonenumber mail
real 0m0.006s
user 0m0.004s
sys 0m0.000s

1. configure your ldap clients properly, that is, reduce to onelevel
scope search and unbind decently,
2. put the transaction logs onto a separate disk,
3. load the whole database into shared memory,
4. use a separate partition for the database files and format with
ext2 fs, we don't need a journaling filesystem,
5. set loglevel 0,
6. implement a log database in order to control write operations
7. check the number of threads

-Dieter
--
Dieter Klünter | Systemberatung
http://dkluenter.de
GPG Key ID:8EF7B6C6
53°37'09,95"N
10°08'02,42"E