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From "Mamta A. Satoor (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-5471) Stress test for identity columns and sequence seem to be taking longer on trunk compared to RC3
Date Tue, 18 Oct 2011 19:03:10 GMT
Stress test for identity columns and sequence seem to be taking longer on trunk compared to RC3

                 Key: DERBY-5471
                 URL: https://issues.apache.org/jira/browse/DERBY-5471
             Project: Derby
          Issue Type: Task
          Components: Test
    Affects Versions:
         Environment: Windows XP version 2.18
Genuine Intel(R) CPU T2600 dual core @2.16GHz 2.00GB of RAM 

$ java -version
java version "1.6.0"
Java(TM) SE Runtime Environment (build pwi3260sr9fp1-20110208_03(SR9 FP1))
IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Windows XP x86-32 jvmwi3260sr9-201102
03_74623 (JIT enabled, AOT enabled)
J9VM - 20110203_074623
JIT  - r9_20101028_17488ifx3
GC   - 20101027_AA)
JCL  - 20110203_01
            Reporter: Mamta A. Satoor

I have been trying to run org.apache.derbyTesting.perf.clients.Runner (which provides ways
to stress test sequence generator and identity columns) on trunk and RC3 to compare
the performance and I find that it takes almost double the time for the tests to finish on
trunk. Additionally, the identity column test consistently ran into lock timeouts on trunk.
I am running with insane jars on trunk and RC3. The test in question is not in official
jars for the release candidate so I manually copied them to RC3 environment during
my test(basically copied the entire org.apache.derbyTesting.perf.clients.Runner directory
from trunk to RC3 environment).

Command to do sequence stress testing is as follows
java org.apache.derbyTesting.perf.clients.Runner -driver org.apache.derby.jdbc.EmbeddedDriver
-init -load seq_gen -load_opts debugging=1,numberOfGenerators=5,tablesPerGenerator=10,insertsPerTransaction=100,identityTest=0
-gen b2b -threads 10

Command to do identity column stress testing is as follows
time java org.apache.derbyTesting.perf.clients.Runner -driver org.apache.derby.jdbc.EmbeddedDriver
-init -load seq_gen -load_opts debugging=1,numberOfGenerators=5,tablesPerGenerator=10,insertsPerTransaction=100,identityTest=1
-gen b2b -threads 10

An average run on RC3 for sequence stress test is about a minute and 46 secs. On
trunk, on an average it takes 2 and half minutes

An average run on RC3 for identity stress test is about a minute and 50 secs. On
trunk, on an average it takes 3minsutes and 30 secs. Also, on trunk, this test runs into lock

I was wondering if this is the right behavior. The performance should be better in trunk because
of pre-allocation of range for sequences and identity columns(which defaults to 20) but unless
I have missed something in my tests, the results don't show the performance improvement.

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