Apache Tomcat is an implmentation of the Java Servlet and JavaServer Pages technologies.
In production Enviroment, number of resources which can all impact application overall performance. Here are some important point which can help to improve Tomcat Performance.
Performance Tuning - Tomcat Configuration
Configure server.xml parameters as following.
-Set reloadable to false
When reloadable is true Tomcat tries to detect web application class changes and automatically reload any classes which change. Setting this to false removes a lot of unnecessary overhead in production.
-Set liveDeploy to false
liveDeploy controls whether your webapps directory is periodically checked for new web application directories and war files. This is done using a background thread. Set this to false and use the manager application or ant deploy tasks instead.
-Set debug to 0
Disable all debug output, unnecessary logging just adds overhead.
-Set swallowOutput to true
This makes sure all output to stdout or stderr for a web application gets directed to the web application log rather than the console or catalina.out. This makes it easier to troubleshoot web application problems.
Performance Tuning - Jasper 2 Configuration
Configure web.xml parameters as following.
-Set development to false
Disables JSP page out of date checks on each request and enables JSP background recompiles. development is set to true by default.
-Use JSP custom tag pooling
Object pooling of classes which implement custom tags significantly improves performance of JSP pages which use custom tag libraries. JSP custom tag pooling is enabled by default.
-Configure Jasper to fork javac compiles. (Do not set fork to true on MS Windows)
The JVM compiler javac has known memory leaks. Eliminates JVM memory usage and GC overhead of javac by configuring Jasper to fork javac when compiling JSP pages.
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