RE: Accessing new heap costs more than old?

On 05 September 2005 19:38, Adrian Hey wrote:

On Monday 05 Sep 2005 5:42 pm, Jan-Willem Maessen wrote:

...

This agrees with my theory.

Thanks, I'm sure this must be the explanation. I guess the moral of the story is that for comparative benchmarks you really do need to make sure you're comparing like with like. Very small differences in test method can have a significant impact on running time it seems.

Can you confirm the hypotheses by inspecting the output from +RTS -sstderr, which tells you the breakdown of GC vs. mutator time? Cheers, Simon