diff --git a/Cargo.toml b/Cargo.toml
index c7de9d3..2560e28 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,6 @@ work-stealing = []
 prefer-local = []
 never-local = []
 
-
 [profile.bench]
 debug = true
 
@@ -48,4 +47,5 @@ cfg-if = "1.0.0"
 [dev-dependencies]
 async-std = "1.13.0"
 tracing-test = "0.2.5"
+tracing-tracy = "0.11.4"
 distaff = {path = "distaff"}
diff --git a/distaff/src/heartbeat.rs b/distaff/src/heartbeat.rs
index 5f523fb..733f0c0 100644
--- a/distaff/src/heartbeat.rs
+++ b/distaff/src/heartbeat.rs
@@ -74,10 +74,6 @@ impl HeartbeatListInner {
         }
     }
 
-    fn iter(&self) -> std::collections::btree_map::Values<'_, u64, HeartbeatSender> {
-        self.heartbeats.values()
-    }
-
     fn notify_nth(&mut self, n: usize) {
         if let Some((_, heartbeat)) = self.heartbeats.iter_mut().nth(n) {
             heartbeat.set();
diff --git a/distaff/src/workerthread.rs b/distaff/src/workerthread.rs
index b709a03..dccb48d 100644
--- a/distaff/src/workerthread.rs
+++ b/distaff/src/workerthread.rs
@@ -67,18 +67,20 @@ impl WorkerThread {
     fn run_inner(&self) {
         let mut job = None;
         'outer: loop {
-            if let Some(job) = job {
+            if let Some(job) = job.take() {
                 self.execute(job);
             }
 
-            if self.context.should_exit() {
-                // if the context is stopped, break out of the outer loop which
-                // will exit the thread.
-                break 'outer;
-            }
-
             // no more jobs, wait to be notified of a new job or a heartbeat.
-            job = self.find_work_or_wait();
+            while job.is_none() {
+                if self.context.should_exit() {
+                    // if the context is stopped, break out of the outer loop which
+                    // will exit the thread.
+                    break 'outer;
+                }
+
+                job = self.find_work_or_wait();
+            }
         }
     }
 }
diff --git a/examples/join.rs b/examples/join.rs
index 9a2c31b..48e6073 100644
--- a/examples/join.rs
+++ b/examples/join.rs
@@ -4,10 +4,10 @@ use executor::util::tree::Tree;
 
 const TREE_SIZE: usize = 16;
 
-fn join_scope() {
+fn join_scope(tree_size: usize) {
     let pool = ThreadPool::new();
 
-    let tree = Tree::new(TREE_SIZE, 1);
+    let tree = Tree::new(tree_size, 1);
 
     fn sum(tree: &Tree<u32>, node: usize, scope: &Scope) -> u32 {
         let node = tree.get(node);
@@ -31,10 +31,10 @@ fn join_scope() {
     }
 }
 
-fn join_pool() {
+fn join_pool(tree_size: usize) {
     let pool = ThreadPool::new();
 
-    let tree = Tree::new(TREE_SIZE, 1);
+    let tree = Tree::new(tree_size, 1);
 
     fn sum(tree: &Tree<u32>, node: usize, pool: &ThreadPool) -> u32 {
         let node = tree.get(node);
@@ -60,10 +60,10 @@ fn join_pool() {
     eprintln!("sum: {sum}");
 }
 
-fn join_distaff() {
+fn join_distaff(tree_size: usize) {
     use distaff::*;
     let pool = ThreadPool::new();
-    let tree = Tree::new(TREE_SIZE, 1);
+    let tree = Tree::new(tree_size, 1);
 
     fn sum<'scope, 'env>(tree: &Tree<u32>, node: usize, scope: &'scope Scope<'scope, 'env>) -> u32 {
         let node = tree.get(node);
@@ -81,17 +81,15 @@ fn join_distaff() {
         node.leaf + l + r
     }
 
-    for _ in 0..1000 {
-        let sum = pool.scope(|s| {
-            let sum = sum(&tree, tree.root().unwrap(), s);
-            sum
-        });
-        std::hint::black_box(sum);
-    }
+    let sum = pool.scope(|s| {
+        let sum = sum(&tree, tree.root().unwrap(), s);
+        sum
+    });
+    std::hint::black_box(sum);
 }
 
-fn join_chili() {
-    let tree = Tree::new(TREE_SIZE, 1u32);
+fn join_chili(tree_size: usize) {
+    let tree = Tree::new(tree_size, 1u32);
 
     fn sum(tree: &Tree<u32>, node: usize, scope: &mut chili::Scope<'_>) -> u32 {
         let node = tree.get(node);
@@ -113,8 +111,8 @@ fn join_chili() {
     }
 }
 
-fn join_rayon() {
-    let tree = Tree::new(TREE_SIZE, 1u32);
+fn join_rayon(tree_size: usize) {
+    let tree = Tree::new(tree_size, 1u32);
 
     fn sum(tree: &Tree<u32>, node: usize) -> u32 {
         let node = tree.get(node);
@@ -133,19 +131,34 @@ fn join_rayon() {
 }
 
 fn main() {
-    tracing_subscriber::fmt::init();
+    // use tracing_subscriber::layer::SubscriberExt;
+    // tracing::subscriber::set_global_default(
+    //     tracing_subscriber::registry().with(tracing_tracy::TracyLayer::default()),
+    // )
+    // .expect("Failed to set global default subscriber");
+
+    let size = std::env::args()
+        .nth(2)
+        .and_then(|s| s.parse::<usize>().ok())
+        .unwrap_or(TREE_SIZE);
+
     match std::env::args().nth(1).as_deref() {
-        Some("scope") => join_scope(),
-        Some("pool") => join_pool(),
-        Some("chili") => join_chili(),
-        Some("distaff") => join_distaff(),
-        Some("rayon") => join_rayon(),
+        Some("scope") => join_scope(size),
+        Some("pool") => join_pool(size),
+        Some("chili") => join_chili(size),
+        Some("distaff") => join_distaff(size),
+        Some("rayon") => join_rayon(size),
         _ => {
             eprintln!(
-                "Usage: {} [scope|pool|chili|distaff|rayon]",
-                std::env::args().next().unwrap()
+                "Usage: {} [scope|pool|chili|distaff|rayon] <tree_size={}>",
+                std::env::args().next().unwrap(),
+                TREE_SIZE
             );
             return;
         }
     }
+
+    eprintln!("Done!");
+    // wait for user input before exiting
+    // std::io::stdin().read_line(&mut String::new()).unwrap();
 }