fix: automatic rebuilds, num_threads for localpools (#4583)

* fix: automatic rebuilds

* Fix concurrency for locapoolhandle

packages/server/src/launch.rs

@@ -101,7 +101,11 @@ async fn serve_server(
         base_path().map(|s| s.to_string()),
     );
 
-    let task_pool = LocalPoolHandle::new(5);
+    let task_pool = LocalPoolHandle::new(
+        std::thread::available_parallelism()
+            .map(usize::from)
+            .unwrap_or(1),
+    );
     let mut make_service = router.into_make_service();
 
     let listener = tokio::net::TcpListener::bind(address).await.unwrap();

packages/server/src/render.rs

@@ -40,9 +40,11 @@ where
         static TASK_POOL: std::sync::OnceLock<LocalPoolHandle> = std::sync::OnceLock::new();
 
         let pool = TASK_POOL.get_or_init(|| {
-            let threads = std::thread::available_parallelism()
-                .unwrap_or(std::num::NonZeroUsize::new(1).unwrap());
-            LocalPoolHandle::new(threads.into())
+            LocalPoolHandle::new(
+                std::thread::available_parallelism()
+                    .map(usize::from)
+                    .unwrap_or(1),
+            )
         });
 
         pool.spawn_pinned(f)