[Pkg-openldap-devel] Bug#421946: openldap2.3: build against newer Berkeley DB

[Howard Chu]

>> Looks like x86_64 requires a specific option.  Maybe it'd be best to 
>> compile it that way for all platforms.
> 
> Are there reproducible tests/benchmarks that we can use to figure out
> whether or not this actually makes sense on any given architecture?

The test I used most recently was to run test008 in the OpenLDAP test suite and 
average the runtimes over 5-10 runs for each BDB version. In my tests I ran 
with SLAPD_DEBUG=0 so the only I/O traffic is from BDB and not from debug 
logging. I also ran with an extremely small cachesize setting (5, the default 
is 1000) to further aggravate the locking contention in the underlying DB. 
Under normal conditions (where the cache is not so ridiculously undersized for 
the workload) the differences are not as apparent.

Also note that the runtimes for this test are non-deterministic since they are 
affected by deadlock retries, and their pattern is unpredictable on most systems.
-- 
   -- Howard Chu
   Chief Architect, Symas Corp.  http://www.symas.com
   Director, Highland Sun        http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP     http://www.openldap.org/project/