basicprofiling.scala

val n = 1e7.toInt
val (rawArray, rawBB, rawFloatBuf) = initArrays(n)
println("result = " + th.pbench({
  var idx = 0
  var sum = 0f
  while(idx < n) {
    sum += rawArray(idx)
    idx += 1
  }
  sum
}, title="raw arrays"))
println("result = " + th.pbench({
  var idx = 0
  var sum = 0f
  while(idx < n) {
    sum += rawBB.getFloat(idx * 4)
    idx += 1
  }
  sum
}, title="byte buffer"))
println("result = " + th.pbench({
  var idx = 0
  var sum = 0f
  while(idx < n) {
    sum += rawFloatBuf.get(idx)
    idx += 1
  }
  sum
}, title="float buffer"))

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