Bir egzersiz olarak, bu Scala ve Java Akka örneklerini Frege bağlantı noktasına götürdüm. İyi çalışıyor olsa da, Scala (540 ms) karşılığı daha yavaş (11s) çalışır. Ben Akka yanlış bir şey yapıyor ya da yavaş olduğu için Frege de tembellik ile ilgili bir şey olduğunuAkka with Frege, Scala karşılığı daha yavaş çalışıyor
module mmhelloworld.akkatutorialfregecore.Pi where
import mmhelloworld.akkatutorialfregecore.Akka
data PiMessage = Calculate |
Work {start :: Int, nrOfElements :: Int} |
Result {value :: Double} |
PiApproximation {pi :: Double, duration :: Duration}
data Worker = private Worker where
calculatePiFor :: Int -> Int -> Double
calculatePiFor !start !nrOfElements = loop start nrOfElements 0.0 f where
loop !curr !n !acc f = if n == 0 then acc
else loop (curr + 1) (n - 1) (f acc curr) f
f !acc !i = acc + (4.0 * fromInt (1 - (i `mod` 2) * 2)/fromInt (2 * i + 1))
onReceive :: Mutable s UntypedActor -> PiMessage -> ST s()
onReceive actor Work{start=start, nrOfElements=nrOfElements} = do
sender <- actor.sender
self <- actor.getSelf
sender.tellSender (Result $ calculatePiFor start nrOfElements) self
data Master = private Master {
nrOfWorkers :: Int,
nrOfMessages :: Int,
nrOfElements :: Int,
listener :: MutableIO ActorRef,
pi :: Double,
nrOfResults :: Int,
workerRouter :: MutableIO ActorRef,
start :: Long } where
initMaster :: Int -> Int -> Int -> MutableIO ActorRef -> MutableIO UntypedActor -> IO Master
initMaster nrOfWorkers nrOfMessages nrOfElements listener actor = do
props <- Props.forUntypedActor Worker.onReceive
router <- RoundRobinRouter.new nrOfWorkers
context <- actor.getContext
workerRouter <- props.withRouter router >>= (\p -> context.actorOf p "workerRouter")
now <- currentTimeMillis()
return $ Master nrOfWorkers nrOfMessages nrOfElements listener 0.0 0 workerRouter now
onReceive :: MutableIO UntypedActor -> Master -> PiMessage -> IO Master
onReceive actor master Calculate = do
self <- actor.getSelf
let tellWorker start = master.workerRouter.tellSender (work start) self
work start = Work (start * master.nrOfElements) master.nrOfElements
forM_ [0 .. master.nrOfMessages - 1] tellWorker
return master
onReceive actor master (Result newPi) = do
let (!newNrOfResults, !pi) = (master.nrOfResults + 1, master.pi + newPi)
when (newNrOfResults == master.nrOfMessages) $ do
self <- actor.getSelf
now <- currentTimeMillis()
duration <- Duration.create (now - master.start) TimeUnit.milliseconds
master.listener.tellSender (PiApproximation pi duration) self
actor.getContext >>= (\context -> context.stop self)
return master.{pi=pi, nrOfResults=newNrOfResults}
data Listener = private Listener where
onReceive :: MutableIO UntypedActor -> PiMessage -> IO()
onReceive actor (PiApproximation pi duration) = do
println $ "Pi approximation: " ++ show pi
println $ "Calculation time: " ++ duration.toString
actor.getContext >>= ActorContext.system >>= ActorSystem.shutdown
calculate nrOfWorkers nrOfElements nrOfMessages = do
system <- ActorSystem.create "PiSystem"
listener <- Props.forUntypedActor Listener.onReceive >>= flip system.actorOf "listener"
let constructor = Master.initMaster nrOfWorkers nrOfMessages nrOfElements listener
newMaster = StatefulUntypedActor.new constructor Master.onReceive
factory <- UntypedActorFactory.new newMaster
masterActor <- Props.fromUntypedFactory factory >>= flip system.actorOf "master"
masterActor.tell Calculate
getLine >> return() --Not to exit until done
main _ = calculate 4 10000 10000
Am? Örneğin, loop
yerine fold
(sıkı kıvrım) Worker.calculatePiFor
yerine ilk kez 27s aldım.
Bağımlılıklar: Frege için
- Akka yerli tanımları: Akka.fr
- Java biz Frege bir sınıf uzatamaz beri Akka sınıfları uzatmak için yardımcı: Actors.java
Bu harika! Şimdi 1.3 saniyeye düşüyor. Oluşturulan Java kaynağına baktım. Şimdi bir '' 'while''' döngüsüne dönüşüyor. –