I am trying to efficiently use multicores for my fizzbuzz project. My fizzbuzz uses a Fibonacci generator as input, and this is where it can get computationally heavy. I believe I have picked the best algorithm for my project (please correct this if wrong), and now I am trying to use the parallel package. I am not getting any better performance in the sense that if I try to compute the 100th Fibonacci number, it is still computing , using 4 cores, several minutes later.

Here is my attempt. Please show me how to use this library right.

from src/FizzBuzz.hs

fizzBuzzFib :: Integer -> [Text]
fizzBuzzFib ub = parMap rdeepseq fizzbuzz $! fibSeq ub

from src/FizzFub.hs

fibSeq :: Integer -> [Integer]
fibSeq ub =
withStrategy (parBuffer buffer rdeepseq) $ genericTake ub fibb
where
  buffer = 100

fibb :: [Integer]    
fibb = 0 : 1 : zipWith (+) fibb (tail fibb)