Criterion is a library for benchmarking Haskell code. For questions related to (N)Hibernate Criteria, use the [criteria] tag.
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Questions tagged [haskell-criterion]
46 questions
5
votes
1 answer
How to use stack bench?
Just tried to run the benchmarks on a project that I have converted from cabal to stack. Running stack bench just prints out project-name-version: benchmarks with no further output. Do I have to pass additional flags to stack to see the criterion…
fho
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4
votes
1 answer
Benchmarking IO action with Criterion
I want to know how long it takes my program to read a 12.9MB .wav file into memory. The function that reads a file into memory looks as follows:
import qualified Data.ByteString as BS
getSamplesFromFileAsBS :: FilePath -> IO…
Thomas Vanhelden
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4
votes
1 answer
Profiling executable with criterion
I need to profile a large number of haskell executables, hopefully in parallel. I was able to get the clock time with measure and measTime from the Criterion library, but couldn't get measCpuTime or any GC report to work (measCpuTime returns a time…
rem
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4
votes
0 answers
What is the workflow of threadscope in actual projects?
I have a cabal benchmark that uses criterion to generate reports, and I also need to use threadscope to revise the parallelism.
I just got it setup, so it's only 4 functions, about 8 seconds of execution, and just from that the eventlog file's size…
MasterMastic
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4
votes
2 answers
Initialize benchmark in criterion and exclude initialization time from results
I need to benchmark some code inside IO, and criterion supports that pretty well. But I want to perform few initialization steps (different for each benchmark). The naive approach:
main = defaultMain
[ bench "the first" $ do
initTheFirst
…
Yuras
- 13,856
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4
votes
1 answer
Performance of reservoir sampling vs. getting the length of a list and picking random elements
I have written two functions to pick a random element out of a list of unknown length. The first uses reservoir sampling (with a reservoir of size 1), and the second gets the length of the list to pick a random index and return it. For some reason,…
Antoine
- 5,158
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3
votes
1 answer
Why only minor change to function design radically changes result of criterion benchmark?
I have two source files which are doing roughly the same. The only difference is that in the first case function is passed as a parameter and in the second one - value.
First case:
module Main where
import Data.Vector.Unboxed as UB
import qualified…
superstate
- 173
- 8
3
votes
1 answer
Asynchronous code runs slower than synchronous version in haskell
Benchmarking the following:
#!/usr/bin/env stack
-- stack --resolver lts-16.2 script --package async --package criterion
import Control.Concurrent.Async (async, replicateConcurrently_)
import Control.Monad …
Noel Kwan
- 123
- 1
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3
votes
2 answers
Creating multiple Criterion Benchmarks at once
This code compiles and runs without problems:
module Main where
import Criterion.Main
main :: IO ()
main =
defaultMain
[env (return $ [1,2])
(\is ->
bgroup "group" (benchmarks is))]
timesTwo :: Int -> Int
timesTwo i = 2…
haskellHQ
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3
votes
2 answers
Cabal install criterion out of memory
I'm running on a container with 768MB ram and 512 MB swap space. I can't increase either of this. cabal install criterion always gives
Failed during the building phase.
The exception was: ExitFailure (-9)
This may be due to an out-of-memory…
jorgen
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3
votes
1 answer
Passing command line arguments to the benhmark program using stack
I'm using stack as a build tool, and criterion as benchmarking library. To run the benchmarks I execute the following command:
stack bench
Criterion accepts command line arguments to specify where the output should be written to. I would like to…
Damian Nadales
- 4,907
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3
votes
0 answers
GHC Haskell performance of IPv4 address rendering
I recently built a library for handling IPv4 address in haskell. I have written two functions to render an IPv4 address to Text and I am surprised that the naive approach outperforms the approach that I actually thought about. Here are the relevant…
Andrew Thaddeus Martin
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2
votes
1 answer
Using Criterion in Haskell
I am very new to Haskell.
I am trying to use Criterion to get performance data. My Main module is as follows:
module Main where
import SingleThreadedBlockChain
import Data.Time.Clock.System (getSystemTime)
import System.IO (readFile)
import…
S. Dale
- 46
- 5
2
votes
1 answer
How to fully evaluate a recursive data type using Control.DeepSeq in Haskell?
I am trying to benchmark (with Criterion) a function, which uses a recursive data type. I found a similar question with an answer that I haven't been able to apply for my case. For non-recursive data types, the following works:
data ExampleDataType1…
ProgrammerPotato
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2
votes
1 answer
Could not find module ‘Criterion.Main’
I have copied the following code from criterion tutorial:
import Criterion.Main
-- The function we're benchmarking.
fib m | m < 0 = error "negative!"
| otherwise = go m
where
go 0 = 0
go 1 = 1
go n = go (n-1) + go (n-2)
--…
Mamtaj Akter
- 21
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