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Date: Wed, 27 Apr 2011 11:39:03 +0000 (UTC)
From: "Knut Anders Hatlen (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
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Subject: [jira] [Created] (DERBY-5206) Investigate reduced throughput in
 some of the nightly performance tests
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Investigate reduced throughput in some of the nightly performance tests
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                 Key: DERBY-5206
                 URL: https://issues.apache.org/jira/browse/DERBY-5206
             Project: Derby
          Issue Type: Task
          Components: SQL
    Affects Versions: 10.8.1.2
         Environment: Solaris 10 5/08 s10x_u5wos_10 X86
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)
            Reporter: Knut Anders Hatlen


The last two months, the nightly performance regression tests (http://home.online.no/~olmsan/derby/perf/) have shown results that are slightly lower than normal for the following test:

- Single Record Select, Non-primary non-indexed column - http://home.online.no/~olmsan/derby/perf/select_sec_noindex_1y.html

- TPC-B like load (aka bank_tx) - http://home.online.no/~olmsan/derby/perf/tpcb_1y.html

For example, when averaging the results from 2011-03-01 to 2011-04-26 and comparing them to the average for the two preceding months (2011-01-01 to 2011-03-01), I see these changes:

Select, single-threaded: 17.05 tx/s -> 16.81 tx/s (down 1.4%)
Select, 4 threads: 25.50 tx/s -> 24.70 tx/s (down 3.1%)
Select, 16 threads: 25.17 tx/s -> 24.47 tx/s (down 2.8%)

bank_tx, single-threaded: 1931 tx/s -> 1904 tx/s (down 1.4%)
bank_tx, 4 threads: 2628 tx/s -> 2589 tx/s (down 1.5%)
bank_tx, 16 threads: 3584 tx/s -> 3519 tx/s (down 1.8%)

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