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{-# LANGUAGE OverloadedStrings #-}
import Control.Concurrent
import Control.Monad
import System.IO
import System.Exit
import System.Environment
import Data.Time.Clock
import System.ZMQ4.Monadic
import qualified Data.ByteString as SB
import Text.Printf
main :: IO ()
main = do
args <- getArgs
when (length args /= 3) $ do
hPutStrLn stderr usage
exitFailure
let bindTo = args !! 0
size = read $ args !! 1
count = read $ args !! 2
runZMQ $ do
s <- socket Sub
subscribe s ""
bind s bindTo
receive' s size
start <- liftIO $ getCurrentTime
loop s count size
end <- liftIO $ getCurrentTime
liftIO $ printStat start end size count
where
receive' s sz = do
msg <- receive s
when (SB.length msg /= sz) $
error "message of incorrect size received"
loop s c sz = unless (c < 0) $ do
receive' s sz
loop s (c - 1) sz
printStat :: UTCTime -> UTCTime -> Int -> Int -> IO ()
printStat start end size count = do
let elapsed = fromRational . toRational $ diffUTCTime end start :: Double
through = fromIntegral count / elapsed
mbits = (through * fromIntegral size * 8) / 1000000
printf "message size: %d [B]\n" size
printf "message count: %d\n" count
printf "mean throughput: %.3f [msg/s]\n" through
printf "mean throughput: %.3f [Mb/s]\n" mbits
usage :: String
usage = "usage: local_thr <bind-to> <message-size> <message-count>"
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