new.png Rational Team Concert for z/OS Enterprise Extension promotion improvement in 5.0

Authors: Lu Lu
Last updated: June 2, 2014
Build basis: Rational Team Concert on z/OS 5.0

Introduction

This report provides data about the enhancement of the promotion feature in RTC EE v5.0. This testing compares performance between RTC EE version 5.0 sprint 4 and version 4.0.6.

In RTC EE v5.0 'Finalize build maps' activities of Promotion feature is improved greatly when check on 'publish build map links' by enhancement.

Objective of this testing is to to ensure there is no regression and verify the performance improvement for the new improvement.

Disclaimer

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.

schematicperformancetestmap.jpg

Findings

In this scenario, we compare 'Finalize build maps' activity in Promotion after checking on 'publish build map links' between RTC EE version 5.0 sprint 4 and 4.0.6.

  • 'Finalize build maps' activity is improved greatly, its time reduced from '3 min 30 sec' to '49.5 sec', improved 70%.

Topology

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

The RTC server was set up based on WebSphere and DB2 on Linux for System z. The build machine with Rational Build Agent was on zOS.

Test Environment
RTC Server Operating System & Version: Linux for System z (SUSE Linux Enterprise Server 10 (s390x))
System Resource : 10 GB Storage, 4 CPs (20000 mips, CPU type : 2097.710, CPU model: E12)
CLM: 5.0 Sprint4 (CALM-I20131211-0734), 4 GB heap size
DB2: 9.7.0.5
WAS: 8.5.5.1
Build Forge Agent Operating System & Version: z/OS 01.12.00
System Resource: 6 GB Storage, 4 CPs (20000 mips, CPU type : 2097.710, CPU model: E12)
Build System Toolkit: 5.0 Sprint4 (RTC-I20131211-0354)

Methodology

Monitor tools - NMON is used for RTC server and RMF on zOS was used for Rational Build Agent.

The sample project used in this test was Mortgage*100 which is 100 duplicates of the Mortgage sample application .

Test Data
Sample Project Mortgage*100
Assets 600 COBOL programs
400 Copybooks
200 BMS
3 others
Total Assets 1203

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

Each test scenario is executed twice against for comparation.

Test Scenarios

Test Scenario Description
Full Dependency Build and Promotion 1)Request full dependency build;
2)Check on 'publish build map links';
3)Request promotion build to compare 'Finalize build maps' activity;

Results

Run duration

These data tables show the run duration comparing 'Finalize build maps' in Promotion between RTC EE version 5.0 sprint 4 and 4.0.6.

From testing result of build time, we can find that 'Finalize build maps' activity in Promotion is improved about 70%.

duration.jpg

Build Activities

These data tables display the detailed build activities run time. In version 5.0 Sprint4, 'Finalize build maps' activity is improved greatly. From following activity charts, you can find that: 'Finalize build maps' process improved about 70%.

finalize_build_maps.jpg

CPU and Memory for CLM Server

This graph shows CPU and memory utilization for RTC server, data is collected by NMON tool.
cpuMemoryV5.jpg
cpuMemoryV406.jpg

CPU and Memory for Build Agent

This graph shows CPU utilization and DASD RATE data for Build Forge Agent on ZOS machine, data is collected by RMF tool.
bfaV5.jpg
bfaV406.jpg

Appendix A - Key Tuning Parameters

Product
Version Highlights for configurations under test
IBM WebSphere Application Server 8.5.5.1 JVM settings:

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

 -Xmn512m -Xgcpolicy:gencon -Xcompressedrefs -Xgc:preferredHeapBase=0x100000000
 -Xmx4g -Xms4g
OS configuration:
* hard nofile 120000                    
* soft nofile 120000
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 9.7.0.5 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


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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