What are some effective ways to benchmark Haskell code?

What are some effective ways to benchmark Haskell code?

You can use libraries like Criterion for precise benchmarking. It provides detailed reports on performance.

How do I set up Criterion in my Haskell project?

First, add Criterion to your project's dependencies in the cabal file. Then, import it in your Haskell file.

Can you show me a simple example of a benchmark using Criterion?

Sure! Here's a basic example:

import Criterion.Main

main :: IO ()
main = defaultMain [
    bgroup "my benchmarks" [
        bench "fib 20" $ whnf fib 20,
        bench "fib 30" $ whnf fib 30
    ]
]

fib :: Integer -> Integer
fib 0 = 0
fib 1 = 1
fib n = fib (n - 1) + fib (n - 2)

What should I look for in the benchmark results?

Focus on the time taken for each benchmark and the relative performance between different functions or implementations.