Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Manuel d'utilisateur télécharger pdf (Page 35)

Configuring JVM

Chapter 3 Using Servlets 35

Configuring JVM

If necessary, you can configure parameters for JVM either by using the

Java>Configure JVM Attributes page in the Server Manager interface, or by editing

jvm12.conf. For more information about JVM settings, see Appendix C, “JVM

Configuration.”

The default settings in iPlanet Web Server for JVM are suitable for running servlets.

However, there may be times when you want to change the settings. For example,

if a servlet or bean file uses a JAR file, you can add the JAR location to the JVM

classpath.

Maximizing Servlet Performance

Consider the following guidelines for improving servlet performance:

•The

jvm12.conf file has a configuration parameter, jvm.stickyAttach.

Setting the value of this parameter to 1 causes threads to remember that they

are attached to the JVM, thus speeding up request processing by eliminating

AttachCurrentThread and DetachCurrentThread calls. It can, however, have

a side-effect: recycled threads which may be doing other processing can be

suspended by the garbage collector arbitrarily.

Thread pools can be used to eliminate this side effect for other subsystems. For

more information about thread pools, see the iPlanet Web Server Administrator’s

Guide.

• Increase the front-end thread stack size in

magnus.conf (via the StackSize

directive), or the respective pool stack size parameter if you’re using thread

pools. For more information, see the NSAPI Programmer’s Guide for iPlanet Web

Server.

• Increase the heap size to help garbage collection:

jvm.minHeapSize or

maxHeapSize or the Configure JVM Attributes page.

• Ensure that your

jvm.classpath is short (if you don't need some of the

examples). You can set

jvm.include.CLASSPATH=0 so it won’t inherit the

CLASSPATH environment variable.

• Sometimes, iPlanet Web Server 6.0 may run out of stack space if applications

use deep recursion when a JIT compiler is enabled, especially on UNIX

platforms where the default stack size is small, or in any cases where very

complex JSP pages are used.

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Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Manuel d'utilisateur Page 35