I set up a simple stack project, and a .cabal entry for the benchmark tests:
benchmark leaves-of-a-tree-bench
type: exitcode-stdio-1.0
hs-source-dirs: src, bench
main-is: MainBenchmarkSuite.hs
build-depends: base
, criterion
, random
, leaves-of-a-tree
ghc-options: -Wall
-O2
default-language: Haskell2010
However after running stack bench I get the following error:
setup-Simple-Cabal-1.22.5.0-ghc-7.10.3: Error: Could not find benchmark program
".stack-work/dist/x86_64-linux/Cabal-1.22.5.0/build/leaves-of-a-tree-bench/leaves-of-a-tree-bench".
Did you build the package first?
Am I missing something?
EDIT: I uploaded the project to a github repository
There is some weird cabal stuff going on here.
Your LeavesOfATreeBench.hs:
-- |
module LeavesOfATreeBench where
import Criterion.Main
import Data.BinTree
mkTree :: [a] -> BinTree a
mkTree [] = Nil
mkTree (x:xs) = Fork x (mkTree lxs) (mkTree rxs)
where (lxs, rxs) = splitAt ((length xs + 1) `div` 2) xs
main :: IO ()
main = defaultMain [
bgroup "leaves"
[ bench "tree 0" $ whnf leaves (mkTree ([0 .. 20] :: [Integer]))
, bench "tree 1" $ whnf leaves (mkTree ([0 .. 200] :: [Integer]))
]
]
Now, once I simply remove the line
module LeavesOfATreeBench where
everything works as expected:
Registering leaves-of-a-tree-0.1.0.0...
leaves-of-a-tree-0.1.0.0: benchmarks
Running 1 benchmarks...
Benchmark leaves-of-a-tree-bench: RUNNING...
benchmarking leaves/tree 0
time 41.81 ns (41.51 ns .. 42.29 ns)
0.999 R² (0.998 R² .. 0.999 R²)
mean 42.65 ns (42.12 ns .. 43.50 ns)
std dev 2.293 ns (1.526 ns .. 3.690 ns)
variance introduced by outliers: 75% (severely inflated)
benchmarking leaves/tree 1
time 71.11 ns (70.41 ns .. 71.84 ns)
0.999 R² (0.999 R² .. 0.999 R²)
mean 71.30 ns (70.45 ns .. 72.19 ns)
std dev 2.917 ns (2.431 ns .. 3.507 ns)
variance introduced by outliers: 62% (severely inflated)
Benchmark leaves-of-a-tree-bench: FINISH
Completed 2 action(s).