add haskell postgresql-simple benchmark

* COMMENT -*- mode: org -*-

#+Date: 2016-12-16

Time-stamp: <2016-12-16>

Time-stamp: <2016-12-17>

* database binding benchmark

I want to know the efficiency of the db binding for different language,

26.2

//side note: why adding -shared in LDFLAGS will just segfault the program?

** postgres 9.4, lts-7.13, ghc 8.0.1, postgresql-simple

0.71

27.5

--

0.63

27.2

--

0.61

26.2

** postgres 9.4, lts-5.18, ghc 7.10.3, postgresql-simple

0.61

26.6

--

0.59

26.8

--

0.63

26.6

module Main where

import Control.Monad

import Text.Printf

import Data.Time.Clock

import Database.PostgreSQL.Simple

times :: Int

times = 3000

selectTest :: Connection -> IO ()

selectTest conn = do

  replicateM_ times (query_ conn "SELECT id, bar FROM foo" :: IO [(Int, Int)])

updateTest :: Connection -> IO ()

updateTest conn =

    replicateM_ times $ execute_ conn "UPDATE foo SET bar=bar+1 WHERE id=1"

timeit :: IO a -> IO a

timeit action = do

  start <- getCurrentTime

  r <- action

  end <- getCurrentTime

  printf "seconds: %f\n" (realToFrac $ diffUTCTime end start :: Double)

  return r

main :: IO ()

main = do

  conn <- connectPostgreSQL "host=localhost dbname=t1 user=t1 password=fNfwREMqO69TB9YqE+/OzF5/k+s="

  timeit $ selectTest conn

  timeit $ updateTest conn

  close conn

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test postgres-simple db binding

import Distribution.Simple

main = defaultMain