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RE: Issues in Performance Tesing of OpenLDAP using SLAMD


I changed the approach for Performance testing. We developed an in-house Java based tool that uses JLDAP library to query openLDAP database.

4 injector machines were used to inject the Traffic to two openLDAP server running in Mirror-mode replication.

However result pattern obtained is very similar to those reported by SLAMD.
PFA, the result sheet that shows query made to Openldap by 4 machines and the respective response time/interval.

Please look into the sheet attached and suggest a possible cause for such a behavior by openLDAP. In some intervals the responses returned are very high while in some others it is 0.

Looking forward for a positive reply from the members of forum.

Please note - Cache was primed before the queries were made.

Shilpa Sethi

Plot 6, Electronic City,
Sector - 18,
Gurgaon 122015
Haryana, India

-----Original Message-----
From: Quanah Gibson-Mount [mailto:quanah@zimbra.com]
Sent: Saturday, November 15, 2008 1:03 AM
To: Shilpa Sethi; openldap-technical@openldap.org
Subject: RE: Issues in Performance Tesing of OpenLDAP using SLAMD

--On Friday, November 14, 2008 5:49 PM +0530 Shilpa Sethi
<shilpa2.sethi@aricent.com> wrote:

> Hi,
> Thanks a lot for the quick reply.
> I Tried out further tests with a set of 50 clients with 1 thread.
> I used 2 slamd client manager from 2 different DL585 machines, Further,
> Started 50 clients on both the servers making in all 100 SLAMD clients.
> The results obtained with the tests with 60, 80 and 100 clients resulted
> in CPU Utilization of 100% in the initial run of ten minutes. CPU
> reported an average of 100% utilized while after 10 minutes, it started
> oscillating between 0% utilized and 100% utilized, resulting in slow down
> of average.

(a) Did you prime the cache before you ran your read test?
(b) You may have to adjust interval periods between reads on the slamd
clients if you're shooting for a particular CPU usage rate.  That was never
the objective of any of my tests, so I don't know.



Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
Zimbra ::  the leader in open source messaging and collaboration

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Attachment: LDAP_QueryResults.xls
Description: LDAP_QueryResults.xls