[jetty-user] Confiigure JVM setting in Jetty standalone server

I'm trying to install a standalone jetty 7.6.3 server in CENTOS. I was able
successfully deploy and run a sample application with default settings. Now
i want to increase the JVM memory, that is set the Xmx and Xms parameters.
After reading through the documentation i have set them in start.ini file.
But this is not getting reflected when i start the server. I have tried
using --exec parameter in start.ini, but this spawns a separate VM.

I'm using java -jar start.jar to start the server

How do i configure the JVM memory GC setting in a jetty standalone server

Thanks

Rohit