A benchmark for implementations of the function:
sumAndLength :: Num a => [a] -> ([a], a)>>> sumAndLength [1,2,3]
(6, 3)
>>> sumAndLength [2,-2,10,5]
(15, 4)In particular this is to evaluate the peformance of the foldl library.
Run the benchmarks with:
cabal new-run FoldlBench -- --regress allocated:iters
What the output looks like on my machine with input [1..10^8]:
Fold Benchmark
benchmarking folds/sumAndLength
time 674.6 ms (524.6 ms .. 765.9 ms)
0.995 R² (0.983 R² .. 1.000 R²)
mean 686.6 ms (671.2 ms .. 704.8 ms)
std dev 20.81 ms (6.867 ms .. 27.43 ms)
allocated: 0.001 R² (0.001 R² .. 1.000 R²)
iters -37.600 (-3880.000 .. 4944.000)
y 3832.000 (1412.000 .. 14648.000)
variance introduced by outliers: 19% (moderately inflated)
benchmarking folds/sumAndLengthStrict
time 4.386 s (397.1 ms .. 7.229 s)
0.916 R² (0.714 R² .. 1.000 R²)
mean 3.828 s (2.941 s .. 4.578 s)
std dev 918.2 ms (318.1 ms .. 1.172 s)
allocated: 1.000 R² (1.000 R² .. 1.000 R²)
iters 9.723e9 (9.723e9 .. 9.723e9)
y 4252.000 (-2440.000 .. 17168.000)
variance introduced by outliers: 48% (moderately inflated)
benchmarking folds/sumAndLengthStrict'
time 317.5 ms (310.6 ms .. 323.5 ms)
1.000 R² (0.999 R² .. 1.000 R²)
mean 318.7 ms (316.2 ms .. 320.4 ms)
std dev 2.428 ms (1.449 ms .. 3.292 ms)
allocated: 0.462 R² (0.309 R² .. 1.000 R²)
iters -702.400 (-2077.000 .. 56.000)
y 4873.600 (1840.000 .. 7528.000)
variance introduced by outliers: 16% (moderately inflated)
benchmarking folds/sumAndLength'
time 12.59 s (9.281 s .. 16.43 s)
0.989 R² (0.963 R² .. 1.000 R²)
mean 12.76 s (12.13 s .. 13.70 s)
std dev 975.2 ms (396.9 ms .. 1.344 s)
allocated: 1.000 R² (1.000 R² .. 1.000 R²)
iters 8.123e9 (8.123e9 .. 8.123e9)
y 2696.000 (2696.000 .. 2696.000)
variance introduced by outliers: 21% (moderately inflated)
benchmarking folds/sumAndLength_Pair
time 304.8 ms (298.7 ms .. 310.5 ms)
1.000 R² (1.000 R² .. 1.000 R²)
mean 313.4 ms (309.2 ms .. 323.6 ms)
std dev 7.973 ms (708.1 μs .. 10.46 ms)
allocated: 0.535 R² (0.385 R² .. 1.000 R²)
iters 830.400 (56.000 .. 1992.000)
y 291.200 (-5129.600 .. 1840.000)
variance introduced by outliers: 16% (moderately inflated)
benchmarking folds/sumAndLengthPairRecurs
time 301.8 ms (284.3 ms .. 320.3 ms)
0.999 R² (0.995 R² .. 1.000 R²)
mean 303.8 ms (300.9 ms .. 310.1 ms)
std dev 5.253 ms (1.515 ms .. 7.024 ms)
allocated: 0.096 R² (0.001 R² .. 1.000 R²)
iters -349.600 (-2225.500 .. 635.429)
y 3868.000 (1840.000 .. 9952.000)
variance introduced by outliers: 16% (moderately inflated)
benchmarking folds/sumAndLength_foldl
time 666.3 ms (653.1 ms .. 678.2 ms)
1.000 R² (1.000 R² .. 1.000 R²)
mean 664.9 ms (662.7 ms .. 666.7 ms)
std dev 2.435 ms (1.981 ms .. 2.742 ms)
allocated: 1.000 R² (1.000 R² .. 1.000 R²)
iters 5.600e9 (5.600e9 .. 5.600e9)
y 3868.000 (-2216.000 .. 14008.000)
variance introduced by outliers: 19% (moderately inflated)
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