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OpenLDAP performance and Glibc under Debian

Hello list,

I've got a repeatable problem with OpenLDAP search performance which appears to be related to the version of glibc under Debian. Hopefully someone can help me further isolate the issue so we can get it resolved. It may actually be a glibc bug, but I just don't know enough to make that call.

My company is preparing for the eventual release of the new Debian stable and we are doing some preliminary testing of our key infrastructure on the testing/unstable release which includes OpenLDAP. One of our tests noted that a substring search of our shared contact list which used to take just under a second, now takes over 10 seconds to complete. After examining the changes between Debian stable and unstable we narrowed the problem down to the version of glibc.

Debian's stable release is currently running glibc version 2.2.5 and the current version in unstable is running glibc version 2.3.2. If you build a pinned Debian box you can switch back and forth between different versions of a package easily enough to test for problems. I've included instructions on how to do this along with an automated LDIF data generator to populate an LDAP repository with fake contact data to demonstrate our issue. The tar ball with the files and more detailed problem description is available here:

ftp://ftp.idealcorp.com/pub/ldap-test.tgz

The tarball includes configs and our schemas for both OpenLDAP 2.0 and 2.1 as well as an automated contact list LDIF generator that can be used to build data to test the performance against. There is also a timed search script script that can be used to create the same kind of search we use in our web-based contact application that first identified the problem.

I would really appreciate help isolating what the underlying problem is. Thanks in advance.

Tony

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Anthony L. Awtrey
Vice President
__________________________________________________
I.D.E.A.L. Technology Corporation - Orlando Office
http://www.idealcorp.com - 407.999.9870 x13