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From Olav Sandstaa <o...@sun.com>
Subject Re: Performance regression after check-in on DERBY 2537 (SVN 531971)
Date Thu, 26 Apr 2007 21:29:11 GMT
The actual performance data from the regression test that made me 
suspect there had been a regression are available here:


These are produced using the same test client as in the graphs I sent 
out earlier. In addition to include the throughput numbers, CPU numbers 
are presented that also indicate increased CPU usage.

These tests are run with JDK6 on Solaris 10.


Olav Sandstaa wrote:
> The two last days I have seen a performance regression in some of the 
> performance tests I run. For some of the tests the reduction in 
> throughput is about 15 percent. It seems like the regression is 
> introduced by the latest check-in on DERBY-2537, svn 531971.
> I have attached a graph showing the throughput I get when running 
> single-record select operation on a table. The queries use a secondary 
> index for finding the record to select. The test has been run with 1 
> to 20 concurrent client against embedded Derby. I have run the test 
> with and without SVN 531971. As the graph shows, the performance 
> reduction is between 12 and 15 percent for all runs.
> The schema looks like this:
>  CREATE INDEX nonprimary_index ON t1 (sec_id)
> Each query do the select on the secondary index and retrieves the data 
> field (a CHARACTER(100) field).
> I would expect some of the changes done in the patch to have some 
> influence on the performance, but not in the order of 10-15 percent.
> The tests are run on a 2 CPU Opteron server running Solaris 10 and JDK 6.
> Olav
> ------------------------------------------------------------------------

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