Added a version of msgsend that uses pipes and select. Here, select is way too slow to be useful, but this can be optimized.

Author: eholk

src/test/bench/msgsend-pipes.rs

@@ -0,0 +1,165 @@
+// A port of the simplistic benchmark from
+//
+//    http://github.com/PaulKeeble/ScalaVErlangAgents
+//
+// I *think* it's the same, more or less.
+
+use std;
+import io::writer;
+import io::writer_util;
+
+import pipes::{port, chan};
+
+macro_rules! move {
+    { $x:expr } => { unsafe { let y <- *ptr::addr_of($x); y } }
+}
+
+enum request {
+    get_count,
+    bytes(uint),
+    stop
+}
+
+fn server(requests: port_set<request>, responses: pipes::chan<uint>) {
+    let mut count = 0u;
+    let mut done = false;
+    while !done {
+        alt requests.try_recv() {
+          some(get_count) { responses.send(copy count); }
+          some(bytes(b)) {
+            //#error("server: received %? bytes", b);
+            count += b;
+          }
+          none { done = true; }
+          _ { }
+        }
+    }
+    responses.send(count);
+    //#error("server exiting");
+}
+
+fn run(args: &[str]) {
+    let (to_parent, from_child) = pipes::stream();
+    let (to_child, from_parent_) = pipes::stream();
+    let from_parent = port_set();
+    from_parent.add(from_parent_);
+
+    let size = option::get(uint::from_str(args[1]));
+    let workers = option::get(uint::from_str(args[2]));
+    let num_bytes = 100;
+    let start = std::time::precise_time_s();
+    let mut worker_results = ~[];
+    for uint::range(0u, workers) |i| {
+        let builder = task::builder();
+        vec::push(worker_results, task::future_result(builder));
+        let (to_child, from_parent_) = pipes::stream();
+        from_parent.add(from_parent_);
+        do task::run(builder) {
+            for uint::range(0u, size / workers) |_i| {
+                //#error("worker %?: sending %? bytes", i, num_bytes);
+                to_child.send(bytes(num_bytes));
+            }
+            //#error("worker %? exiting", i);
+        };
+    }
+    do task::spawn {
+        server(from_parent, to_parent);
+    }
+
+    vec::iter(worker_results, |r| { future::get(r); } );
+    //#error("sending stop message");
+    to_child.send(stop);
+    move!{to_child};
+    let result = from_child.recv();
+    let end = std::time::precise_time_s();
+    let elapsed = end - start;
+    io::stdout().write_str(#fmt("Count is %?\n", result));
+    io::stdout().write_str(#fmt("Test took %? seconds\n", elapsed));
+    let thruput = ((size / workers * workers) as float) / (elapsed as float);
+    io::stdout().write_str(#fmt("Throughput=%f per sec\n", thruput));
+    assert result == num_bytes * size;
+}
+
+fn main(args: ~[str]) {
+    let args = if os::getenv("RUST_BENCH").is_some() {
+        ~["", "1000000", "10000"]
+    } else if args.len() <= 1u {
+        ~["", "10000", "4"]
+    } else {
+        copy args
+    };        
+
+    #debug("%?", args);
+    run(args);
+}
+
+// Treat a whole bunch of ports as one.
+class box<T> {
+    let mut contents: option<T>;
+    new(+x: T) { self.contents = some(x); }
+
+    fn swap(f: fn(+T) -> T) {
+        let mut tmp = none;
+        self.contents <-> tmp;
+        self.contents = some(f(option::unwrap(tmp)));
+    }
+
+    fn unwrap() -> T {
+        let mut tmp = none;
+        self.contents <-> tmp;
+        option::unwrap(tmp)
+    }
+}
+
+class port_set<T: send> {
+    let ports: box<~[pipes::streamp::server::open<T>]>;
+
+    new() { self.ports = box(~[]); }
+
+    fn add(+port: pipes::port<T>) {
+        let pipes::port_(port) <- port;
+        let mut p = none;
+        port.endp <-> p;
+        do self.ports.swap |ports| {
+            let mut p_ = none;
+            p <-> p_;
+            vec::append_one(ports, option::unwrap(p_))
+        }
+    }
+
+    fn try_recv() -> option<T> {
+        let mut result = none;
+        let mut done = false;
+        while !done {
+            do self.ports.swap |ports| {
+                if ports.len() > 0 {
+                    let old_len = ports.len();
+                    let (_, m, ports) = pipes::select(ports);
+                    alt m {
+                      some(pipes::streamp::data(x, next)) {
+                        result = some(move!{x});
+                        done = true;
+                        assert ports.len() == old_len - 1;
+                        vec::append_one(ports, move!{next})
+                      }
+                      none {
+                        //#error("pipe closed");
+                        assert ports.len() == old_len - 1;
+                        ports
+                      }
+                    }
+                }
+                else {
+                    //#error("no more pipes");
+                    done = true;
+                    ~[]
+                }
+            }
+        }
+        result
+    }
+
+    fn recv() -> T {
+        option::unwrap(self.try_recv())
+    }
+}