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Haskell Thread Ring Benchmark

Not as fast as the erlang version coming soon:




import Control.Monad
import Control.Concurrent
import System.Environment
import System.CPUTime

fork_ring_elem prev_mvar _ = do
  next_mvar <- newEmptyMVar
  forkIO (ring_elem prev_mvar next_mvar)
  return next_mvar

ring_elem :: MVar Int -> MVar Int -> IO ()
ring_elem prev_mv next_mv = run
  where run = do
          token <- takeMVar prev_mv
          putMVar next_mv (token - 1)         
          when ( token > 0 ) run

first_ring_elem :: MVar Int -> MVar Int -> IO ()
first_ring_elem prev_mv next_mv = run
  where run = do
          token <- takeMVar prev_mv
          putMVar next_mv (token - 1)         
          putStrLn "."
          when ( token > 0 ) run

main = do
  (procsArg:roundsArg:_) <- getArgs
  first_mvar <- newMVar ((read procsArg) * (read roundsArg))
  t1 <- getCPUTime
  last_mvar <- foldM fork_ring_elem first_mvar [2..(read procsArg)]
  t2 <- getCPUTime
  putStrLn ("forked processes in " ++ (show (t2 - t1)) ++ " ps")
  first_ring_elem last_mvar first_mvar
  t3 <- getCPUTime
  putStrLn "\n***finished***"
  putStrLn ("total time: " ++ (show (t3 - t1)) ++ " ps")

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