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Re: (ITS#3851) Berkeley DB Scalability Patch

--On Friday, July 15, 2005 6:41 PM -0700 Quanah Gibson-Mount 
<quanah@symas.com> wrote:

> --On Friday, July 15, 2005 1:26 PM -0400 Jong-Hyuk
> <jongchoi@watson.ibm.com> wrote:
>> Quanah,
>> Here are more performance evaluation results of the Berkeley DB
>> scalability patch. My results revealed no sign of performance degradation
>> as reported in your result and I couldn't find any good reason why you
>> had have such a devastation.
>> As you can see in the above results, virtually no performance degradation
>> was observed in the no memory pressure condition. With memory pressure,
>> it is shown that the Berkeley DB scalability patch significantly improves
>> the scalability of both pure searches and mixed operations (searches and
>> adds).
> Hi Jong,
> I'm testing again.  Looking back into the tests messages, I see that
> slapd actually core dumped, which is why the results dropped so low.
> I've not had the stock 2.3.4 with BDB 4.2.52+patches core dump on me any
> time previously, so this would be a new behavior.
> I've reloaded the database from scratch, and am re-testing.

Hi Jong,

The second test looks good.

Without patch:
630.304 ops/second
182.671 mod/second
447.632 searches/second

With patch:
632.156 ops/second
183.216 mod/second
448.941 searches/second

So a definite (though slight in my small database case) improvement. Yeah. 


Quanah Gibson-Mount
Product Engineer
Symas Corporation
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