Specifying JRuby memory usage from command line

Hi,

I’ve been experimenting with JRuby on a Debian 4 based machine,
installed the Sun java 5 sdk, works fine, compiles and executes java
helloworld files. However, JRuby gives me:

$ jruby
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

I’ve attempted to pass in settings to tweak swap space similarly to with
the JVM, but had no luck.

Any ideas? Thanks in advance…

Justin