arraylikeProfile.scala

trait ArrayLike[@specialized T] {
  def apply(idx: Int) : T
  def update(idx: Int, value: T)
  def length: Int
  def size: Int = length
}

def sumArrayLike(arr: ArrayLike[Float]): Float = {
  var idx = 0
  var sum = 0f
  while(idx < arr.length) {
    sum += arr(idx)
    idx += 1
  }
  sum
}

val n = 1e7.toInt
val (_, wrapped, buf, arrBuf) = initArrays(n) // now this returns classes that implement ArrayLike
println("result = " + th.pbench(sumArrayLike(wrapped), title="wrapped array"))
println("result = " + th.pbench(sumArrayLike(arrBuf), title="float array wrapped in FloatBuffer"))
println("result = " + th.pbench(sumArrayLike(buf), title="byte array wrapped in FloatBuffer"))

Gist for a blog post: http://imranrashid.com/posts/profiling-bytebuffers/
Full code is at https://github.com/squito/oleander/blob/blog_post_profiling_interfaces/src/test/scala/com/imranrashid/oleander/ByteBufferBackedTest.scala