diff --git a/tidepool/src/main.rs b/tidepool/src/main.rs
index fbc3c5d..ead801d 100644
--- a/tidepool/src/main.rs
+++ b/tidepool/src/main.rs
@@ -61,9 +61,11 @@ fn single(args: cli::SingleRun) -> Result<()> {
     let (tx, rx) = create_mailbox();
     let exit_early = Arc::new(atomic::AtomicBool::new(false));
 
-    let exit_early2 = exit_early.clone();
-    let config2 = config.clone();
-    std::thread::spawn(move || run_simulation(&args.data, config2, args.seed, 0, tx, exit_early2));
+    std::thread::spawn({
+        let config = config.clone();
+        let exit_early = exit_early.clone();
+        move || run_simulation(&args.data, config, args.seed, 0, &tx, &exit_early)
+    });
 
     while let Ok(msg) = rx.recv() {
         tracing::trace!(msg = debug(&msg));
@@ -116,8 +118,8 @@ fn multi(args: cli::MultiRun) -> Result<()> {
     let config = parse_config_file(&args.config_file)?;
 
     let (tx, rx) = create_mailbox();
-    let tasks = args.count.unwrap_or(u32::MAX);
-    let tasks = Arc::new(atomic::AtomicI64::new(tasks as i64));
+    let tasks = args.count.map_or(i64::MAX, |n| n as i64);
+    let tasks = Arc::new(atomic::AtomicI64::new(tasks));
     let exit_early = Arc::new(atomic::AtomicBool::new(false));
 
     let n_jobs = args.jobs.unwrap_or_else(num_cpus::get);
@@ -127,13 +129,13 @@ fn multi(args: cli::MultiRun) -> Result<()> {
     tracing::debug!("spawning {n_jobs} jobs");
     for id in 0..n_jobs {
         jobs.insert(id, None);
-        let tx2 = tx.clone();
-        let tasks2 = tasks.clone();
-        let exit_early2 = exit_early.clone();
-        let config2 = config.clone();
-        let data_args = args.data.clone();
-        std::thread::spawn(move || {
-            run_simulations(&data_args, config2, id, tx2, tasks2, exit_early2);
+        std::thread::spawn({
+            let data_args = args.data.clone();
+            let config = config.clone();
+            let tx = tx.clone();
+            let tasks = tasks.clone();
+            let exit_early = exit_early.clone();
+            move || run_simulations(&data_args, config, id, &tx, &tasks, &exit_early)
         });
     }
 
@@ -335,8 +337,8 @@ fn run_simulation(
     config: config::Config,
     seed: Option<u64>,
     id: usize,
-    tx: mpsc::SyncSender<Msg>,
-    exit_early: Arc<atomic::AtomicBool>,
+    tx: &mpsc::SyncSender<Msg>,
+    exit_early: &atomic::AtomicBool,
 ) {
     let mut moves = data_args.list_moves.then(Vec::new);
     let seed = seed.unwrap_or_else(|| rand::thread_rng().next_u64());
@@ -415,20 +417,16 @@ fn run_simulations(
     data_args: &cli::OutputDataArgs,
     config: config::Config,
     id: usize,
-    tx: mpsc::SyncSender<Msg>,
-    tasks: Arc<atomic::AtomicI64>,
-    exit_early: Arc<atomic::AtomicBool>,
+    tx: &mpsc::SyncSender<Msg>,
+    tasks: &atomic::AtomicI64,
+    exit_early: &atomic::AtomicBool,
 ) {
     while tasks.fetch_sub(1, atomic::Ordering::Relaxed) > 0 {
         if exit_early.load(atomic::Ordering::Relaxed) {
             break;
         }
 
-        let seed = None;
-        let config2 = config.clone();
-        let tx2 = tx.clone();
-        let exit_early2 = exit_early.clone();
-        run_simulation(&data_args, config2, seed, id, tx2, exit_early2);
+        run_simulation(data_args, config.clone(), None, id, tx, exit_early);
     }
 
     if tx.send(Msg::Shutdown(id)).is_err() {