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Re: dynlist performance
2013/11/27 "POISSON Frédéric" <frederic.poisson@admin.gmessaging.net>:
> Hello,
>
> I'm testing the dynlist overlay on OpenLDAP 2.4.38 because i have a static
> group of around 10K uniqueMember. I want to have now a equivalent group with
> dynlist.
>
> I have configured my overlay dynlist like this :
> dn: olcOverlay={2}dynlist,olcDatabase={1}bdb,cn=config
> objectClass: olcOverlayConfig
> objectClass: olcDynamicList
> olcOverlay: {2}dynlist
> olcDlAttrSet: {0}groupOfURLs memberURL uniqueMember
>
> And my group is quite like OpenLDAP example in documentation :
>
> dn: cn=GeneralisationDyn,ou=Groups,dc=example,dc=com
> objectClass: top
> objectClass: groupOfURLs
> cn: GeneralisationDyn
> memberURL: ldap:///ou=People,dc=example,dc=com??one?(objectClass=person)
> uniqueMember: uid=user1,ou=People,dc=example,dc=com
> uniqueMember: uid=user2,ou=People,dc=example,dc=com
> [...]
>
> My backend is Berkeley DB and i have tune it in order to have quite fast
> responses on searches, and locally on my server (virtualized with a single
> proc), it take that time to return the entries found by memberURL :
>
> real 0m0.272s
> user 0m0.040s
> sys 0m0.023s
>
> If i run an ldapsearch to see all uniqueMember of my dynamic group it take
> around 8 to 10 seconds to have the output !
>
> Why a so big difference of response time in a search of entries and a search
> of uniqueMember inside a dynamic group ?
> Is there some tuning for dynlist plugin ?
>
> Notice also that when i search uniqueMember inside my static group with
> quite same number of uniqueMember) i have less than 0.1 seconds of real
> time.
>
Hi Frederic,
you should configure sortvals for uniqueMember:
dn: olcDatabase={-1}frontend,cn=config
changetype: modify
add: olcSortVals
olcSortVals: uniqueMember
As you are a French guy, you can get more details on this page:
http://coudot.blogs.linagora.com/index.php/post/2013/01/07/Astuce-OpenLDAP-%3A-Des-groupes-dynamiques-Jamais-sans-tri-des-valeurs-!
Clément.