Any way to cut down on memory footprint?

I did some tests of what kind of memory footprint some sample
operations have. I did a test where I generate 10,000,000 random
doubles (generated by calling nextGaussian() in java.util.Random),
storing them in an ArrayBuffer, and the memory usage was about 250 MB.

Seems like a bit much. Anything I can do about this?

Doing the same thing with 20,000,000 instead of 10,000,000 gave an out
of memory error. Is there any way to give the JVM a bigger heap size
to work with when running Scala code?

Here's the code I used, in case it matters.

import java.util.{Date, Random}
import scala.collection.mutable.ArrayBuffer

object randtest {
 def main(args: Array[String]) {
   val cnt = Integer.parseInt(args(0))
   val rnd = new Random()
   val buf = new ArrayBuffer[Double]

   val start = System.currentTimeMillis
   for(val i <- Iterator.range(0,cnt)) {
     buf += rnd.nextGaussian
   }
   val end = System.currentTimeMillis
   val diff = (end - start)/1000.0
   Console.println(diff + "s")
   Console.readLine // just so we can see how much memory is being used
 }
}

Warren