![Actor - Actor
Actor
• Actors
actor ! ChangeYourPosition
Pid ! change_your_position
• Actors
val a = actor { loop(I) ->
def loop(i: Int): Unit = receive
react { I -> I, loop(I + 1);
case i: Int => loop(i + 1) exit -> io:format(“~p~n”, [I])
case Exit => println(i) end
} end
loop(0) Pid = spawn(fun loop/1, [0])
}
•
• Actor
• loop (Scala Erlang) (Scala)
• Actors](https://image.slidesharecdn.com/qconbeijing2010-100424042341-phpapp01/85/Scala-Erlang-QConBeijing2010-7-320.jpg)
![Erlang vs Scala –
object ThreadRing {
val (nTokens, nProcs) = (20000, 10000)
def main(args: Array[String]) {
val last= Ring(null, 1)
val h = Range(nProcs, 2, -1).foldLeft(last){(acc, i) => Ring(acc, i)}
last.next = h
h ! nTokens
}
case class Ring(var next: Ring, id: Int) extends Actor {
start
def act = loop {
react {
case 1 =>
println("Done")
println(id)
System.exit(0)
case token: Int =>
next ! token - 1
println(token)
//fib(N_FIB)
}
}
}
}](https://image.slidesharecdn.com/qconbeijing2010-100424042341-phpapp01/85/Scala-Erlang-QConBeijing2010-20-320.jpg)
![Erlang vs Scala –
-module(threadring).
-export([main/0, ring/2]).
-define(N_TOKENS, 20000).
-define(N_PROCS, 10000).
main() ->
start(?N_TOKENS).
start(NToken) ->
H = lists:foldl(fun(Id, Pid) ->
spawn(threadring, ring, [Id, Pid])
end, self(), lists:seq(?N_PROCS, 2, -1)),
H ! NToken,
ring(1, H).
ring(Id, Pid) ->
receive
1 ->
io:fwrite(”~p~n", [done]),
io:fwrite("~b~n", [Id]),
erlang:halt();
Token ->
Pid ! Token - 1,
io:fwrite("~b~n", [Token]),
//fib(?N_FIB),
ring(Id, Pid)
end.](https://image.slidesharecdn.com/qconbeijing2010-100424042341-phpapp01/85/Scala-Erlang-QConBeijing2010-21-320.jpg)
并发需求下Scala和Erlang的比较－QConBeijing2010
- 1. Scala Erlang Beijing 2010.04 Caoyuan (NetBeans Dream Team Member) http://blogtrader.net @dcaoyuan
- 2. • ( ) • •
- 3. • • CPU • • • • •
- 4. - • 1206 • 103 x1.5 =155 6 • 6144 CPU 5120 GPU • • 1280 • 1280 • 3 16 • CPU 60%
- 5. • • Fortress Erlang Scala => Scala • • • DSL • - • Map-Reduce, Fork-Join •
- 6. Actor Erlang Scala Erlang Scala Actor • Erlang • Erlang VM Actor • • Scala • Actor JVM • actor
- 7. Actor - Actor Actor • Actors actor ! ChangeYourPosition Pid ! change_your_position • Actors val a = actor { loop(I) -> def loop(i: Int): Unit = receive react { I -> I, loop(I + 1); case i: Int => loop(i + 1) exit -> io:format(“~p~n”, [I]) case Exit => println(i) end } end loop(0) Pid = spawn(fun loop/1, [0]) } • • Actor • loop (Scala Erlang) (Scala) • Actors
- 8. Actor Actor OO • • OO • Actor • (immutable) • • • Actor • Actor Actor • Actor Actor Actor
- 9. Actor Actor • • • Actor CPU •
- 10. Actor CPU
- 11. Actor – vs Actor Actor CPU Actors CPU
- 12. JVM Scheduler • • IO • CPU
- 13. Scala JVM Actor Scheduler • Actor Object • Actor • Actor • Actor Actor • Actors Actors • Scala IO IO Actor
- 14. Erlang Actor Process Scheduler • Erlang Actor Process • Process • Process • Process • Erlang IO Process IO
- 15. • Actor Actors Actor • sleep IO • Scala Actor NIO
- 16. Erlang vs Scala – • Erlang Process • Process • Process • Process CPU Process • log 2-core 140 process 200 process CPU 1 / 200 * 2 Core = 1% 8-core 700 process 980 process CPU 1 / 980 * 8 Core = 0.82%
- 17. Erlang vs Scala – • Scala Actor • Actor Actors • Actor • • Actor
- 18. Erlang vs Scala – • Erlang Process • • (GC ) • ( ) • VM ( ) • • ( )
- 19. Erlang vs Scala – • Scala Actor Erlang • • • VM VM • • JVM •
- 20. Erlang vs Scala – object ThreadRing { val (nTokens, nProcs) = (20000, 10000) def main(args: Array[String]) { val last= Ring(null, 1) val h = Range(nProcs, 2, -1).foldLeft(last){(acc, i) => Ring(acc, i)} last.next = h h ! nTokens } case class Ring(var next: Ring, id: Int) extends Actor { start def act = loop { react { case 1 => println("Done") println(id) System.exit(0) case token: Int => next ! token - 1 println(token) //fib(N_FIB) } } } }
- 21. Erlang vs Scala – -module(threadring). -export([main/0, ring/2]). -define(N_TOKENS, 20000). -define(N_PROCS, 10000). main() -> start(?N_TOKENS). start(NToken) -> H = lists:foldl(fun(Id, Pid) -> spawn(threadring, ring, [Id, Pid]) end, self(), lists:seq(?N_PROCS, 2, -1)), H ! NToken, ring(1, H). ring(Id, Pid) -> receive 1 -> io:fwrite(”~p~n", [done]), io:fwrite("~b~n", [Id]), erlang:halt(); Token -> Pid ! Token - 1, io:fwrite("~b~n", [Token]), //fib(?N_FIB), ring(Id, Pid) end.
- 22. Erlang vs Scala –FP OO+FP • Erlang • • Process •
- 23. Erlang vs Scala –FP OO+FP • Scala OO+FP • • Actor Actors • Actor •
- 24. Q&A Scala