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Rational Team Concert For IBMi Concurrent Build Performance todo.png

Authors: LuLu SuHui
Date: June 30th, 2015
Build basis: Rational Team Concert for IBMi version 5.0.2, 6.x


This report compares the concurrent build performance of RTC for IBMi since v5.0.2 until v6.0.1. The test include both concurrent team build and concurrent personal build.

Based on the test data, there is a little improvement of the concurrent build run duration, which is due to the constant performance improvements of the dependency build feature.

The performance data provided is obtained by benchmark test of each release. This report only includes the build run duration information.


The information in this document is distributed AS IS. The use of this information or the implementation of any of these techniques is a customer responsibility and depends on the customerís ability to evaluate and integrate them into the customerís operational environment. While each item may have been reviewed by IBM for accuracy in a specific situation, there is no guarantee that the same or similar results will be obtained elsewhere. Customers attempting to adapt these techniques to their own environments do so at their own risk. Any pointers in this publication to external Web sites are provided for convenience only and do not in any manner serve as an endorsement of these Web sites. Any performance data contained in this document was determined in a controlled environment, and therefore, the results that may be obtained in other operating environments may vary significantly. Users of this document should verify the applicable data for their specific environment.

Performance is based on measurements and projections using standard IBM benchmarks in a controlled environment. The actual throughput or performance that any user will experience will vary depending upon many factors, including considerations such as the amount of multi-programming in the userís job stream, the I/O configuration, the storage configuration, and the workload processed. Therefore, no assurance can be given that an individual user will achieve results similar to those stated here.

This testing was done as a way to compare and characterize the differences in performance between different versions of the product. The results shown here should thus be looked at as a comparison of the contrasting performance between different versions, and not as an absolute benchmark of performance.

What our tests measure

We use predominantly automated tooling such as Rational Performance Tester (RPT) to simulate a workload normally generated by client software such as the Eclipse client or web browsers. All response times listed are those measured by our automated tooling and not a client.

The diagram below describes at a very high level which aspects of the entire end-to-end experience (human end-user to server and back again) that our performance tests simulate. The tests described in this article simulate a segment of the end-to-end transaction as indicated in the middle of the diagram. Performance tests are server-side and capture response times for this segment of the transaction.



Based on the test data, concurrent build performance of the RTC for IBMi has improved from 5.0.2 to 6.0.1.

From 5.0.2 to 6.0, the overall improvement of the build time is about 5% for concurrent team build, but no obvious improvement in concurrent personal build.

From 6.0 to 6.0.1, the overall improvement of the build time is about 2% for concurrent team build.


The tests are executed in a Single Tier Topology infrastructure like the one in the following diagram:

Single Tier Topology: IBMi


The RTC server was set up based on WebSphere and DB2 on IBMi. The build machine with Rational Build Agent was on IBMi.

Test Environment
RTC Server Operating System & Version: IBMi v7.1
System Resource : 4 dedicated processors, 30GB memory
CLM: from 5.0.2 GA to 6.0.1 GA, 6 GB heap size
DB2: DB2 for IBMi v7.1
WAS: 5.0.2 GA to 6.0 GA), 6.0GA to 6.0.1 GA)
Build Forge Agent Operating System & Version: IBMi v7.1
System Resource: 4 dedicated processors, 30GB memory
Build System Toolkit: from 5.0.2 GA to 6.0.1 GA


Build durations are compared by getting test start date and time.

The sample projects for the test are:

  • Maillist Application *250

Test Data
Sample Project Maillist *250
Assets 1250 RPGLE
4 LF
2 PF
1 * CLP
Total Assets 2017

In the repository the source code is stored in one stream with one single component which includes 5 zComponent Projects.

Every test is executed twice against each version.

Test Scenario Description

Test Scenario Description
Concurrent Build 1. Perform two team build concurrently
2. After the team builds are completed, created five repository workspaces, change a RPG file in each of the repository workspace
3. Request five personal builds concurrently


Note : since 6.0.1 benchmark , we have replaced our IBMi performance testing LPARs and new performance baselines are created. 6.0 benchmark have been re-run to compare on identical hardware.

Run duration

The charts below show the build run duration comparison between 5.0.2 and 6.0, and from v6.0 to v6.0.1. Tests are run twice against each release and the average time is taken for comparison.

From 5.0.2 to 6.0, the overall improvement of the build time is about 5% for concurrent team build, but no obvious improvement in concurrent personal build.

From 6.0 to 6.0.1, the overall improvement of the build time is about 2% for concurrent team build.

The data in the charts are the average time of the concurrent builds.

Concurrent team build

In this test scenario, two team builds are requested concurrently.



Concurrent personal build

In this test scenario, five personal build are requested concurrently after one RPG file is changed.



Appendix A - Key Tuning Parameters

Version Highlights for configurations under test
IBM WebSphere Application Server (5.0.2GA to 6.0GA), 6.0GA to 6.0.1 GA) JVM settings:

* GC policy and arguments, max and init heap sizes:

 -Xmn768m -Xgcpolicy:gencon -Xcompressedrefs -Xgc:preferredHeapBase=0x200000000
 -Xmx6g -Xms6g

Refer to http://pic.dhe.ibm.com/infocenter/clmhelp/v4r0m4/topic/com.ibm.jazz.install.doc/topics/c_special_considerations_linux.html for details

DB2 DB2 Enterprise Server for IBMi v7.1 Tablespace is stored on the same machine as IBM WebSphere Application Server
License Server Same as CLM version Hosted locally by JTS server
Network Shared subnet within test lab

About the authors

LuLu SuHui

Questions and comments:
  • What other performance information would you like to see here?
  • Do you have performance scenarios to share?
  • Do you have scenarios that are not addressed in documentation?
  • Where are you having problems in performance?

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