Compute jvm heap size to host web application

Question

I want to host a web application on a private JVM they offer 32, 64, 128, 256 MB plans.

My web application uses Spring. And I store some objects for every logged in user session.

My question is: How can I profile my web app to see how much heap size it needs so I can choose a plan?, How can I simulate hundreds of users logged in at the same time?

I'm developing the application using Netbeans 6.7 Java 1.6 Tomcat 6.0.18

Thank you.

Answer 1

• For profiling you can use VisualVM, YourKit, etc.
• For simulating load you can use Apache JMeter

Answer 2

I'd recommend using a tool like JMeter to do your load testing. You can use jvisualvm to see basic heap usage or grab a heap dump to see exact details.