>Is it that for these dozen or so benchmarks, we end up using > 4K and < 8K of heap? stack, not heap. We are talking about changing the default stack size. >S

>Is it that for these dozen or so benchmarks, we end up using > 4K and < 8K of heap? stack, not heap. We are talking about changing the default stack size. >So the extra 20% time is just going into a memory allocation? Yes and the book keeping overhead involved at the OS and runtime levels.