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Added a benchmark of bounded vs unbounded. Bounded is 8-12% faster. T…
…he macros currently don't work without pretty printing first.
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// Compare bounded and unbounded protocol performance. | ||
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// xfail-test | ||
// xfail-pretty | ||
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use std; | ||
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import pipes::{spawn_service, recv}; | ||
import std::time::precise_time_s; | ||
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proto! pingpong { | ||
ping: send { | ||
ping -> pong | ||
} | ||
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pong: recv { | ||
pong -> ping | ||
} | ||
} | ||
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proto! pingpong_unbounded { | ||
ping: send { | ||
ping -> pong | ||
} | ||
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pong: recv { | ||
pong -> ping | ||
} | ||
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you_will_never_catch_me: send { | ||
never_ever_ever -> you_will_never_catch_me | ||
} | ||
} | ||
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// This stuff should go in libcore::pipes | ||
macro_rules! move { | ||
{ $x:expr } => { unsafe { let y <- *ptr::addr_of($x); y } } | ||
} | ||
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macro_rules! follow { | ||
{ | ||
$($message:path($($x: ident),+) -> $next:ident $e:expr)+ | ||
} => ( | ||
|m| alt move(m) { | ||
$(some($message($($x,)* next)) { | ||
let $next = move!{next}; | ||
$e })+ | ||
_ { fail } | ||
} | ||
); | ||
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{ | ||
$($message:path -> $next:ident $e:expr)+ | ||
} => ( | ||
|m| alt move(m) { | ||
$(some($message(next)) { | ||
let $next = move!{next}; | ||
$e })+ | ||
_ { fail } | ||
} | ||
) | ||
} | ||
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fn switch<T: send, Tb: send, U>(+endp: pipes::recv_packet_buffered<T, Tb>, | ||
f: fn(+option<T>) -> U) -> U { | ||
f(pipes::try_recv(endp)) | ||
} | ||
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fn move<T>(-x: T) -> T { x } | ||
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// Here's the benchmark | ||
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fn bounded(count: uint) { | ||
import pingpong::*; | ||
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let mut ch = do spawn_service(init) |ch| { | ||
let mut count = count; | ||
let mut ch = ch; | ||
while count > 0 { | ||
ch = switch(ch, follow! { | ||
ping -> next { server::pong(next) } | ||
}); | ||
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count -= 1; | ||
} | ||
}; | ||
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let mut count = count; | ||
while count > 0 { | ||
let ch_ = client::ping(ch); | ||
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ch = switch(ch_, follow! { | ||
pong -> next { next } | ||
}); | ||
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count -= 1; | ||
} | ||
} | ||
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fn unbounded(count: uint) { | ||
import pingpong_unbounded::*; | ||
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let mut ch = do spawn_service(init) |ch| { | ||
let mut count = count; | ||
let mut ch = ch; | ||
while count > 0 { | ||
ch = switch(ch, follow! { | ||
ping -> next { server::pong(next) } | ||
}); | ||
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count -= 1; | ||
} | ||
}; | ||
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let mut count = count; | ||
while count > 0 { | ||
let ch_ = client::ping(ch); | ||
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ch = switch(ch_, follow! { | ||
pong -> next { next } | ||
}); | ||
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count -= 1; | ||
} | ||
} | ||
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fn timeit(f: fn()) -> float { | ||
let start = precise_time_s(); | ||
f(); | ||
let stop = precise_time_s(); | ||
stop - start | ||
} | ||
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fn main() { | ||
let count = 1000000; | ||
let bounded = do timeit { bounded(count) }; | ||
let unbounded = do timeit { unbounded(count) }; | ||
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io::println(#fmt("count: %?\n", count)); | ||
io::println(#fmt("bounded: %? s\t(%? μs/message)", | ||
bounded, bounded * 1000000. / (count as float))); | ||
io::println(#fmt("unbounded: %? s\t(%? μs/message)", | ||
unbounded, unbounded * 1000000. / (count as float))); | ||
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io::println(#fmt("\n\ | ||
bounded is %?%% faster", | ||
(unbounded - bounded) / bounded * 100.)); | ||
} |