Intel AS/400 RISC Server - Manual (Page 93)

6.3 WebSphere Application Server
This section discusses System i performance information for the WebSphere Application Server,
including WebSphere Application Server V6.1, WebSphere Application Server V6.0, WebSphere
Application Server V5.0 and V5.1, and WebSphere Application Server Express V5.1. Historically, both
WebSphere and i5/OS Java performance improve with each version. Note from the figures and data in
this section that the most recent versions of WebSphere and/or i5/OS generally provides the best
performance.
What’s new in V6R1?
The release of i5/OS V6R1 brings with it significant performance benefits for many WebSphere
applications. The following chart shows the amount of improvement in transactions per second (TPS) for
the Trade 6.1 workload using various data access methods:
Thi
s
cha
rt
sho
ws that in V6R1, throughput levels for Trade 6.1 increased from 50% to nearly 80% versus V5R4,
depending on which JDBC provider was being used. All measurement results were obtained in a 2-tier
environment (both application and database on the same partition) on a 2-core 2.2Ghz System i partition,
using Version 6.1 of WebSphere Application Server and IBM Technology for Java VM. Although many
of the improvements are applicable to 3-tier environments as well, the communications overhead in these
environments may affect the amount of improvement that you will see.
The improvements in V6R1 were primarily in the JDBC, DB2 for i5/OS and Java areas, as well as
changes in other i5/OS components such as seize/release and PASE call overhead. The majority of the
improvements will be achieved without any changes to your application, although some improvements do
require additional tuning (discussed below in Tuning Changes for V6R1). Although some of the changes
are now available via V5R4 PTFs, the majority of the improvement will only be realized by moving to
V6R1. The actual amount of improvement in any particular application will vary, particularly depending
on the amount of JDBC/DB activity, where a significant majority of the changes were made. In addition,
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008 Chapter 6 - Web Server and WebSphere 93
0
200
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600
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Native JDBC Toolbox JDBC Universal JCC
V5R4 GA V6R1 GA
+68% +78%
+50%