Added a message send that uses shared chans. They are slower than port selectors, but scale better.
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src/test/bench/msgsend-pipes-shared.rs
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208
src/test/bench/msgsend-pipes-shared.rs
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// A port of the simplistic benchmark from
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//
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// http://github.com/PaulKeeble/ScalaVErlangAgents
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//
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// I *think* it's the same, more or less.
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// This version uses pipes with a shared send endpoint. It should have
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// different scalability characteristics compared to the select
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// version.
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use std;
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import io::writer;
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import io::writer_util;
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import arc::methods;
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import pipes::{port, chan};
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macro_rules! move {
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{ $x:expr } => { unsafe { let y <- *ptr::addr_of($x); y } }
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}
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enum request {
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get_count,
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bytes(uint),
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stop
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}
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fn server(requests: port<request>, responses: pipes::chan<uint>) {
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let mut count = 0u;
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let mut done = false;
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while !done {
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alt requests.try_recv() {
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some(get_count) { responses.send(copy count); }
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some(bytes(b)) {
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//#error("server: received %? bytes", b);
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count += b;
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}
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none { done = true; }
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_ { }
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}
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}
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responses.send(count);
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//#error("server exiting");
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}
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fn run(args: &[str]) {
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let (to_parent, from_child) = pipes::stream();
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let (to_child, from_parent) = pipes::stream();
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let to_child = shared_chan(to_child);
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let size = option::get(uint::from_str(args[1]));
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let workers = option::get(uint::from_str(args[2]));
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let num_bytes = 100;
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let start = std::time::precise_time_s();
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let mut worker_results = ~[];
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for uint::range(0u, workers) |i| {
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let builder = task::builder();
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vec::push(worker_results, task::future_result(builder));
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let to_child = to_child.clone();
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do task::run(builder) {
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for uint::range(0u, size / workers) |_i| {
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//#error("worker %?: sending %? bytes", i, num_bytes);
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to_child.send(bytes(num_bytes));
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}
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//#error("worker %? exiting", i);
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};
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}
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do task::spawn {
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server(from_parent, to_parent);
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}
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vec::iter(worker_results, |r| { future::get(r); } );
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//#error("sending stop message");
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to_child.send(stop);
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move!{to_child};
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let result = from_child.recv();
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let end = std::time::precise_time_s();
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let elapsed = end - start;
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io::stdout().write_str(#fmt("Count is %?\n", result));
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io::stdout().write_str(#fmt("Test took %? seconds\n", elapsed));
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let thruput = ((size / workers * workers) as float) / (elapsed as float);
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io::stdout().write_str(#fmt("Throughput=%f per sec\n", thruput));
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assert result == num_bytes * size;
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}
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fn main(args: ~[str]) {
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let args = if os::getenv("RUST_BENCH").is_some() {
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~["", "1000000", "10000"]
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} else if args.len() <= 1u {
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~["", "10000", "4"]
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} else {
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copy args
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};
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#debug("%?", args);
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run(args);
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}
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// Treat a whole bunch of ports as one.
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class box<T> {
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let mut contents: option<T>;
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new(+x: T) { self.contents = some(x); }
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fn swap(f: fn(+T) -> T) {
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let mut tmp = none;
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self.contents <-> tmp;
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self.contents = some(f(option::unwrap(tmp)));
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}
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fn unwrap() -> T {
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let mut tmp = none;
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self.contents <-> tmp;
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option::unwrap(tmp)
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}
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}
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class port_set<T: send> {
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let mut ports: ~[pipes::port<T>];
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new() { self.ports = ~[]; }
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fn add(+port: pipes::port<T>) {
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vec::push(self.ports, port)
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}
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fn try_recv() -> option<T> {
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let mut result = none;
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while result == none && self.ports.len() > 0 {
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let i = pipes::wait_many(self.ports.map(|p| p.header()));
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// dereferencing an unsafe pointer nonsense to appease the
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// borrowchecker.
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alt unsafe {(*ptr::addr_of(self.ports[i])).try_recv()} {
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some(m) {
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result = some(move!{m});
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}
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none {
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// Remove this port.
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let mut ports = ~[];
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self.ports <-> ports;
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vec::consume(ports,
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|j, x| if i != j { vec::push(self.ports, x) });
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}
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}
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}
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/*
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while !done {
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do self.ports.swap |ports| {
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if ports.len() > 0 {
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let old_len = ports.len();
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let (_, m, ports) = pipes::select(ports);
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alt m {
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some(pipes::streamp::data(x, next)) {
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result = some(move!{x});
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done = true;
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assert ports.len() == old_len - 1;
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vec::append_one(ports, move!{next})
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}
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none {
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//#error("pipe closed");
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assert ports.len() == old_len - 1;
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ports
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}
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}
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}
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else {
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//#error("no more pipes");
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done = true;
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~[]
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}
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}
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}
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*/
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result
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}
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fn recv() -> T {
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option::unwrap(self.try_recv())
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}
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}
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impl private_methods/&<T: send> for pipes::port<T> {
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pure fn header() -> *pipes::packet_header unchecked {
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alt self.endp {
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some(endp) {
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endp.header()
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}
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none { fail "peeking empty stream" }
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}
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}
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}
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type shared_chan<T: send> = arc::exclusive<pipes::chan<T>>;
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impl chan<T: send> for shared_chan<T> {
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fn send(+x: T) {
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let mut xx = some(x);
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do self.with |_c, chan| {
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let mut x = none;
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x <-> xx;
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chan.send(option::unwrap(x))
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}
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}
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}
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fn shared_chan<T:send>(+c: pipes::chan<T>) -> shared_chan<T> {
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arc::exclusive(c)
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}
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