Avoid starving UX threads

Author: rsdy

server/bleep/src/background.rs

@@ -75,9 +75,19 @@ impl BackgroundExecutor {
         _ = rayon::ThreadPoolBuilder::new()
             .spawn_handler(move |thread| {
                 let tokio_ref = tokio_ref.clone();
+
+                let thread_priority = if cfg!(feature = "ee") {
+                    // 0-100 low-high
+                    // pick mid-range for worker threads so we don't starve other threads
+                    thread_priority::ThreadPriority::Crossplatform(49u8.try_into().unwrap())
+                } else {
+                    // on the desktop it's full throttle, as number of cores is limited
+                    thread_priority::ThreadPriority::Max
+                };
+
                 std::thread::Builder::new()
                     .name("index-worker".to_owned())
-                    .spawn_with_priority(thread_priority::ThreadPriority::Max, move |_| {
+                    .spawn_with_priority(thread_priority, move |_| {
                         let _tokio = tokio_ref.enter();
                         thread.run()
                     })