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Re: Update on performance issues with Openldap 2.1.x and Solaris 8

On Fri, 3 Jan 2003, Quanah Gibson-Mount wrote:

> Thought I'd send out an update on where Stanford is at since my last mail:
> We are now at 45 queries/second via GSSAPI binds sustained with 18 hosts on
> a single CPU Netra T1.  On a 3 CPU Netra 1405, we have gone up to 75
> queries/second via GSSAPI binds, and it was apparent that this rate could
> be pushed higher.  If we were to use pooled connections, it was found that
> we could get at least 120 queries/second.

Thanks for the update.  This was an interesting thread even though I did
not have the performace issues you ran into, but I do not use GSSAPI.

Can you elaborate more on connection pooling and how to configure?


> We are currently running:
> Openldap 2.1.10
> Cyrus-SASL-2.1.10
> Berkeley DB-4.1.24
> Heimdal-0.5.1 (plus patches)
> OpenSSL-0.9.6g
> To achieve this massive performance increase (from about 4-6
> queries/second), we hired Howard Chu as a consultant.  He found the
> performance problems I reported to be a combination of issues in OpenLDAP,
> Cyrus-SASL, and Heimdal (and not, as was often suggested on this list,
> problems with our setup).  The changes he made to fix these problems on the
> OpenLDAP side are in 2.1.10, and the same with Cyrus-SASL.  Howard
> submitted the fixes to Heimdal as well, but they have as yet not released
> an updated version.  Part of the performance boost came in part with a new
> caching piece for Berkeley DB, so people who are running the 2.1.x series
> with Berkeley DB as their backend, may see an increase in performance if
> they move to 2.1.10 from older versions.
> For those of you pondering a consultant for OpenLDAP, or who may do so, I
> personally strongly recommend Howard.  He is extremely knowledgeable of the
> interworkings of OpenLDAP, and is quick to find, isolate, and fix problems
> that he finds.
> Regards,
> Quanah Gibson-Mount
> --
> Quanah Gibson-Mount
> Senior Systems Administrator
> ITSS/TSS/Computing Systems
> Stanford University
> GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html