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Initialize the criterion into the criteria and exclude the time of initialization of the results

I need to check the code inside IO, and the criterion supports this pretty well. But I want to perform several initialization steps (different for each test). Naive approach:

main = defaultMain
  [ bench "the first" $ do
      initTheFirst
      theFirst
      cleanUpTheFirst
  , bench "the second" $ do
      initTheSecond
      theSecond
      cleanUpTheSecond
  ]

But it performs initialization and cleaning for each test (100 times by default) and includes initialization time to the final results. Is it possible to exclude initialization time?

ADDED: The code uses the global state (actually mongodb), so I can not prepare two initial states at the same time.

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2 answers

Three real options that I see here. Initialize and clean before and after:

main = do
  initTheFirst
  initTheSecond

  defaultMain
    [ bench "the first" theFirst
    , bench "the second" theSecond
    ]

  cleanUpTheFirst
  cleanUpTheSecond

, , .

defaultMain , , Criterion.

+2

, custom main, argiopeweb:

import Control.Monad
import Control.Monad.IO.Class
import Control.Concurrent
import Criterion
import Criterion.Config
import Criterion.Monad
import Criterion.Environment

main :: IO ()
main = myMain [
  (initTheFirst, theFirst),
  (initTheSecond, theSecond)
  ]

initTheFirst :: IO ()
initTheFirst = do
  putStrLn "initializing the first"
  threadDelay 1000000

theFirst :: Benchmark
theFirst = bench "the first" $ do
  return () :: IO ()

initTheSecond :: IO ()
initTheSecond = do
  putStrLn "initializing the second"
  threadDelay 1000000

theSecond :: Benchmark
theSecond = bench "the second" $ do
  return () :: IO ()

myMain :: [(IO (), Benchmark)] -> IO ()
myMain benchmarks = withConfig defaultConfig $ do
  env <- measureEnvironment
  forM_ benchmarks $ \(initialize, benchmark) -> do
    liftIO $ initialize
    runAndAnalyse (const True) env benchmark

:

warming up
estimating clock resolution...
mean is 1.723574 us (320001 iterations)
found 1888 outliers among 319999 samples (0.6%)
  1321 (0.4%) high severe
estimating cost of a clock call...
mean is 43.45580 ns (13 iterations)
found 2 outliers among 13 samples (15.4%)
  2 (15.4%) high severe
initializing the first

benchmarking the first
mean: 7.782388 ns, lb 7.776217 ns, ub 7.790563 ns, ci 0.950
std dev: 36.01493 ps, lb 29.29834 ps, ub 52.51021 ps, ci 0.950
initializing the second

benchmarking the second
mean: 7.778543 ns, lb 7.773192 ns, ub 7.784518 ns, ci 0.950
std dev: 28.85100 ps, lb 25.59891 ps, ub 32.85481 ps, ci 0.950

, init* .

+5

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