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Current Issue
July/August 1999
Improving Java performance on the Network
Station 1000
Volume 3, Issue 4
Table of Contents
For Java applications or applets you plan to run
frequently, experiment with the Just In Time (JIT)
compiler enabled and disabled option to see which way
performs better. The Network Station 1000 (NS1000) JIT feature can significantly improve
performance, but it also takes up more memory, which — under low-memory conditions —
can actually slow performance. You can enable or disable the JIT compiler in the Network
Station Manager’s Internet|Network settings.
For large Java applications or applets, increase the heap size, especially if you have extra
memory available on your system. You can set the heap size in the Network Station
Manager’s settings for Java applications or applets. To display the amount of memory your
system has installed and how much is being used for Java, select Statistics|Show memory
from the Network Station User Services Console. (You can display the Console from an
NS1000 session by pressing Alt+Shift+Home.) Don’t, however, allocate all your extra
memory to the heap because the JVM uses some system (non-heap) memory, for example,
to store images used in an application or applet.
The Verbose option (which you can also set using the Network Station Manager) can help
diagnose problems when you deploy a Java application or applet, but you should turn off
this option for production use because it slows performance.
Configuring IBM’s Network
Station 1000 for Java
Eye on IDEs:
SiteBoss/400 Net.Data
Macro Editor
Calling an AS/400 Stored
Procedure with JDBC
Download Code
Clever AS/400 Output
Queue and Spool File
Book Reviews:
Java And the AS/400:
Practical Examples Using
VisualAge for Java
Improving Java
performance on the
Network Station 1000
Determining system
properties for a Java
This tip is brought to you
by AS/400 e-Developer, a
NEWS/400 newsletter. For
more information about
this newsletter, or to
request a free sample,
please click here.
Tip provided by Keith Pichelman, a software engineer with IBM’s Network Station organization.
You can reach Keith at
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