Haskell function execution time

Question

Is there a simple method to compute time of function execution in Haskell?

Answer 1

Simplest things is to just do :set +s in ghci, and then you can see the execution time of anything you run, along with memory usage.

Answer 2

The criterion package was made specifically to do this well.

Answer 3

See if http://hackage.haskell.org/package/timeit suits your needs.