OffHeap.scala

object Play extends App {

  implicit val alloc = offheap.malloc

  val arr = new scala.Array[offheap.Array[Byte]](Int.MaxValue/8)

  var counter = 0
  while (counter < Int.MaxValue/8) {
    arr(counter) = offheap.Array.fromArray("foobar".getBytes)
    counter+=1
  }

}

If you run this with -Xmx4096 it crashes with java.lang.OutOfMemoryError: GC overhead limit exceeded