[DERBY-5471] Stress test for identity columns and sequence seem to be taking longer on trunk compared to 10.8.2.2 RC3

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 10.9.1.0
• Component/s: Test

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

• Bug behavior facts: Performance
• Assignee: Unassigned
• Reporter: Mamta A. Satoor
• Created: 18/Oct/11 19:02
• Updated: 17/Jun/13 09:19
• Resolved: 09/May/12 12:42

Description

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 10.8.2.2 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 10.8.2.2 RC3. The test in question is not in official jars for the release candidate so I manually copied them to 10.8.2.2 RC3 environment during my test(basically copied the entire org.apache.derbyTesting.perf.clients.Runner directory from trunk to 10.8.2.2 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 10.8.2.2 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 10.8.2.2 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 timeouts.

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.

Issue Links

• is related to: DERBY-5495 Master issue to track fixes to sequence generators