indeed. My suggestion is 

1) use criterion, its awsome

2) run the criterion suite with a variety of optimization flag choices so you can understand how that changes performance

3) use criterion some more !

On Thu, Oct 23, 2014 at 10:35 AM, Daniel Trstenjak <daniel.trstenjak@gmail.com> wrote:

Hi Magnus,

> Given that all I'm interested in is relative timings it might even be
> enough to do a rough comparison of two implementations too.

Optimizations - especially in Haskell - can change the runtime behaviour
quite dramatically. So comparing the runtime performance without turned
on optimizations is pretty much pointless.

Meaningful benchmarking is hard and adding any kind of uncertainty
doesn't make it in any way easier.

Greetings,
Daniel
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