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Suspicious Results

I would have expected PCG to be at least twice as fast as Mersenne and all the results seem to be identical for all the different RNGs. This makes me suspicious.

prng-bench $ ~/Library/Haskell/ghc-7.10.3/lib/prng-bench-0.1.0.0/bin/prng-bench
benchmarking Next/10000_Random
time                 122.8 μs   (121.6 μs .. 124.0 μs)
                     0.999 R²   (0.998 R² .. 0.999 R²)
mean                 122.6 μs   (121.1 μs .. 124.1 μs)
std dev              4.668 μs   (3.787 μs .. 5.908 μs)
variance introduced by outliers: 37% (moderately inflated)

benchmarking Next/10000_SplitMix
time                 122.9 μs   (121.3 μs .. 124.7 μs)
                     0.999 R²   (0.998 R² .. 0.999 R²)
mean                 122.7 μs   (121.5 μs .. 124.3 μs)
std dev              4.747 μs   (3.780 μs .. 6.969 μs)
variance introduced by outliers: 38% (moderately inflated)

benchmarking Next/10000_TFRandom
time                 120.8 μs   (119.5 μs .. 122.5 μs)
                     0.998 R²   (0.998 R² .. 0.999 R²)
mean                 121.5 μs   (120.3 μs .. 123.1 μs)
std dev              4.765 μs   (4.118 μs .. 5.649 μs)
variance introduced by outliers: 39% (moderately inflated)

benchmarking Next/10000_Mersenne
time                 122.5 μs   (121.2 μs .. 123.9 μs)
                     0.999 R²   (0.998 R² .. 0.999 R²)
mean                 123.2 μs   (122.2 μs .. 124.7 μs)
std dev              3.909 μs   (3.189 μs .. 5.051 μs)
variance introduced by outliers: 30% (moderately inflated)

benchmarking Next/10000_PCGRandom
time                 122.5 μs   (121.0 μs .. 123.9 μs)
                     0.999 R²   (0.998 R² .. 0.999 R²)
mean                 122.3 μs   (121.3 μs .. 123.7 μs)
std dev              4.147 μs   (3.377 μs .. 5.606 μs)
variance introduced by outliers: 32% (moderately inflated)

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