diff --git a/src/test/bench/msgsend-ring-mutex-arcs.rs b/src/test/bench/msgsend-ring-mutex-arcs.rs
new file mode 100644
index 000000000000..172351e506fb
--- /dev/null
+++ b/src/test/bench/msgsend-ring-mutex-arcs.rs
@@ -0,0 +1,114 @@
+// This test creates a bunch of tasks that simultaneously send to each
+// other in a ring. The messages should all be basically
+// independent.
+// This is like msgsend-ring-pipes but adapted to use ARCs.
+
+// This also serves as a pipes test, because ARCs are implemented with pipes.
+
+// xfail-pretty
+
+import future::future;
+
+use std;
+import std::time;
+import std::arc;
+
+// A poor man's pipe.
+type pipe = arc::mutex_arc<~[uint]>;
+
+fn send(p: &pipe, msg: uint) {
+    do p.access_cond |state, cond| {
+        vec::push(*state, msg);
+        cond.signal();
+    }
+}
+fn recv(p: &pipe) -> uint {
+    do p.access_cond |state, cond| {
+        while vec::is_empty(*state) {
+            cond.wait();
+        }
+        vec::pop(*state)
+    }
+}
+
+fn init() -> (pipe,pipe) {
+    let m = arc::mutex_arc(~[]);
+    ((&m).clone(), m)
+}
+
+
+fn thread_ring(i: uint,
+               count: uint,
+               +num_chan: pipe,
+               +num_port: pipe) {
+    let mut num_chan <- some(num_chan);
+    let mut num_port <- some(num_port);
+    // Send/Receive lots of messages.
+    for uint::range(0u, count) |j| {
+        //error!{"task %?, iter %?", i, j};
+        let mut num_chan2 = option::swap_unwrap(&mut num_chan);
+        let mut num_port2 = option::swap_unwrap(&mut num_port);
+        send(&num_chan2, i * j);
+        num_chan = some(num_chan2);
+        let _n = recv(&num_port2);
+        //log(error, _n);
+        num_port = some(num_port2);
+    };
+}
+
+fn main(args: ~[~str]) {
+    let args = if os::getenv(~"RUST_BENCH").is_some() {
+        ~[~"", ~"100", ~"10000"]
+    } else if args.len() <= 1u {
+        ~[~"", ~"10", ~"100"]
+    } else {
+        copy args
+    }; 
+
+    let num_tasks = option::get(uint::from_str(args[1]));
+    let msg_per_task = option::get(uint::from_str(args[2]));
+
+    let (num_chan, num_port) = init();
+    let mut num_chan = some(num_chan);
+
+    let start = time::precise_time_s();
+
+    // create the ring
+    let mut futures = ~[];
+
+    for uint::range(1u, num_tasks) |i| {
+        //error!{"spawning %?", i};
+        let (new_chan, num_port) = init();
+        let num_chan2 = ~mut none;
+        *num_chan2 <-> num_chan;
+        let num_port = ~mut some(num_port);
+        futures += ~[future::spawn(|move num_chan2, move num_port| {
+            let mut num_chan = none;
+            num_chan <-> *num_chan2;
+            let mut num_port1 = none;
+            num_port1 <-> *num_port;
+            thread_ring(i, msg_per_task,
+                        option::unwrap(num_chan),
+                        option::unwrap(num_port1))
+        })];
+        num_chan = some(new_chan);
+    };
+
+    // do our iteration
+    thread_ring(0u, msg_per_task, option::unwrap(num_chan), num_port);
+
+    // synchronize
+    for futures.each |f| { future::get(&f) };
+
+    let stop = time::precise_time_s();
+
+    // all done, report stats.
+    let num_msgs = num_tasks * msg_per_task;
+    let elapsed = (stop - start);
+    let rate = (num_msgs as float) / elapsed;
+
+    io::println(fmt!{"Sent %? messages in %? seconds",
+                     num_msgs, elapsed});
+    io::println(fmt!{"  %? messages / second", rate});
+    io::println(fmt!{"  %? μs / message", 1000000. / rate});
+}
diff --git a/src/test/bench/msgsend-ring-rw-arcs.rs b/src/test/bench/msgsend-ring-rw-arcs.rs
new file mode 100644
index 000000000000..6dcaabdb56e3
--- /dev/null
+++ b/src/test/bench/msgsend-ring-rw-arcs.rs
@@ -0,0 +1,115 @@
+// This test creates a bunch of tasks that simultaneously send to each
+// other in a ring. The messages should all be basically
+// independent.
+// This is like msgsend-ring-pipes but adapted to use ARCs.
+
+// This also serves as a pipes test, because ARCs are implemented with pipes.
+
+// xfail-pretty
+
+import future::future;
+
+use std;
+import std::time;
+import std::arc;
+
+// A poor man's pipe.
+type pipe = arc::rw_arc<~[uint]>;
+
+fn send(p: &pipe, msg: uint) {
+    do p.write_cond |state, cond| {
+        vec::push(*state, msg);
+        cond.signal();
+    }
+}
+fn recv(p: &pipe) -> uint {
+    do p.write_cond |state, cond| {
+        while vec::is_empty(*state) {
+            error!("have to wait");
+            cond.wait();
+        }
+        vec::pop(*state)
+    }
+}
+
+fn init() -> (pipe,pipe) {
+    let x = arc::rw_arc(~[]);
+    ((&x).clone(), x)
+}
+
+
+fn thread_ring(i: uint,
+               count: uint,
+               +num_chan: pipe,
+               +num_port: pipe) {
+    let mut num_chan <- some(num_chan);
+    let mut num_port <- some(num_port);
+    // Send/Receive lots of messages.
+    for uint::range(0u, count) |j| {
+        //error!{"task %?, iter %?", i, j};
+        let mut num_chan2 = option::swap_unwrap(&mut num_chan);
+        let mut num_port2 = option::swap_unwrap(&mut num_port);
+        send(&num_chan2, i * j);
+        num_chan = some(num_chan2);
+        let _n = recv(&num_port2);
+        //log(error, _n);
+        num_port = some(num_port2);
+    };
+}
+
+fn main(args: ~[~str]) {
+    let args = if os::getenv(~"RUST_BENCH").is_some() {
+        ~[~"", ~"100", ~"10000"]
+    } else if args.len() <= 1u {
+        ~[~"", ~"10", ~"100"]
+    } else {
+        copy args
+    }; 
+
+    let num_tasks = option::get(uint::from_str(args[1]));
+    let msg_per_task = option::get(uint::from_str(args[2]));
+
+    let (num_chan, num_port) = init();
+    let mut num_chan = some(num_chan);
+
+    let start = time::precise_time_s();
+
+    // create the ring
+    let mut futures = ~[];
+
+    for uint::range(1u, num_tasks) |i| {
+        //error!{"spawning %?", i};
+        let (new_chan, num_port) = init();
+        let num_chan2 = ~mut none;
+        *num_chan2 <-> num_chan;
+        let num_port = ~mut some(num_port);
+        futures += ~[future::spawn(|move num_chan2, move num_port| {
+            let mut num_chan = none;
+            num_chan <-> *num_chan2;
+            let mut num_port1 = none;
+            num_port1 <-> *num_port;
+            thread_ring(i, msg_per_task,
+                        option::unwrap(num_chan),
+                        option::unwrap(num_port1))
+        })];
+        num_chan = some(new_chan);
+    };
+
+    // do our iteration
+    thread_ring(0u, msg_per_task, option::unwrap(num_chan), num_port);
+
+    // synchronize
+    for futures.each |f| { future::get(&f) };
+
+    let stop = time::precise_time_s();
+
+    // all done, report stats.
+    let num_msgs = num_tasks * msg_per_task;
+    let elapsed = (stop - start);
+    let rate = (num_msgs as float) / elapsed;
+
+    io::println(fmt!{"Sent %? messages in %? seconds",
+                     num_msgs, elapsed});
+    io::println(fmt!{"  %? messages / second", rate});
+    io::println(fmt!{"  %? μs / message", 1000000. / rate});
+}