Merge pull request #1140 from wang384670111/tune_ordering

Potential to modify ordering for split_count and tour_counter

rayon-demo/src/tsp/solver.rs

@@ -64,7 +64,7 @@ impl<'s> SolverCx<'s> {
     }
 
     pub fn tour_id(&self) -> TourId {
-        let counter = self.tour_counter.fetch_add(1, Ordering::SeqCst);
+        let counter = self.tour_counter.fetch_add(1, Ordering::Relaxed);
         TourId { id: counter }
     }
 

src/iter/par_bridge.rs

@@ -112,7 +112,7 @@ impl<Iter: Iterator + Send> UnindexedProducer for &IterParallelProducer<'_, Iter
         // Check if the iterator is exhausted
         let update = self
             .split_count
-            .fetch_update(Ordering::SeqCst, Ordering::SeqCst, |c| c.checked_sub(1));
+            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |c| c.checked_sub(1));
         (self, update.is_ok().then_some(self))
     }