wip

tokio/src/runtime/scheduler/multi_thread/counters.rs

@@ -5,27 +5,42 @@ mod imp {
 
     static NUM_MAINTENANCE: AtomicUsize = AtomicUsize::new(0);
     static NUM_NOTIFY_LOCAL: AtomicUsize = AtomicUsize::new(0);
+    static NUM_NOTIFY_REMOTE: AtomicUsize = AtomicUsize::new(0);
     static NUM_UNPARKS_LOCAL: AtomicUsize = AtomicUsize::new(0);
     static NUM_LIFO_SCHEDULES: AtomicUsize = AtomicUsize::new(0);
     static NUM_LIFO_CAPPED: AtomicUsize = AtomicUsize::new(0);
     static NUM_STEALS: AtomicUsize = AtomicUsize::new(0);
+    static NUM_OVERFLOW: AtomicUsize = AtomicUsize::new(0);
+    static NUM_PARK: AtomicUsize = AtomicUsize::new(0);
+    static NUM_POLLS: AtomicUsize = AtomicUsize::new(0);
+    static NUM_LIFO_POLLS: AtomicUsize = AtomicUsize::new(0);
 
     impl Drop for super::Counters {
         fn drop(&mut self) {
             let notifies_local = NUM_NOTIFY_LOCAL.load(Relaxed);
+            let notifies_remote = NUM_NOTIFY_REMOTE.load(Relaxed);
             let unparks_local = NUM_UNPARKS_LOCAL.load(Relaxed);
             let maintenance = NUM_MAINTENANCE.load(Relaxed);
             let lifo_scheds = NUM_LIFO_SCHEDULES.load(Relaxed);
             let lifo_capped = NUM_LIFO_CAPPED.load(Relaxed);
             let num_steals = NUM_STEALS.load(Relaxed);
+            let num_overflow = NUM_OVERFLOW.load(Relaxed);
+            let num_park = NUM_PARK.load(Relaxed);
+            let num_polls = NUM_POLLS.load(Relaxed);
+            let num_lifo_polls = NUM_LIFO_POLLS.load(Relaxed);
 
             println!("---");
-            println!("notifies (local): {}", notifies_local);
-            println!(" unparks (local): {}", unparks_local);
-            println!("     maintenance: {}", maintenance);
-            println!("  LIFO schedules: {}", lifo_scheds);
-            println!("     LIFO capped: {}", lifo_capped);
-            println!("          steals: {}", num_steals);
+            println!("notifies (remote): {}", notifies_remote);
+            println!(" notifies (local): {}", notifies_local);
+            println!("  unparks (local): {}", unparks_local);
+            println!("      maintenance: {}", maintenance);
+            println!("   LIFO schedules: {}", lifo_scheds);
+            println!("      LIFO capped: {}", lifo_capped);
+            println!("           steals: {}", num_steals);
+            println!("  queue overflows: {}", num_overflow);
+            println!("            parks: {}", num_park);
+            println!("            polls: {}", num_polls);
+            println!("     polls (LIFO): {}", num_lifo_polls);
         }
     }
 
@@ -33,6 +48,10 @@ mod imp {
         NUM_NOTIFY_LOCAL.fetch_add(1, Relaxed);
     }
 
+    pub(crate) fn inc_num_notify_remote() {
+        NUM_NOTIFY_REMOTE.fetch_add(1, Relaxed);
+    }
+
     pub(crate) fn inc_num_unparks_local() {
         NUM_UNPARKS_LOCAL.fetch_add(1, Relaxed);
     }
@@ -52,16 +71,37 @@ mod imp {
     pub(crate) fn inc_num_steals() {
         NUM_STEALS.fetch_add(1, Relaxed);
     }
+
+    pub(crate) fn inc_num_overflows() {
+        NUM_OVERFLOW.fetch_add(1, Relaxed);
+    }
+
+    pub(crate) fn inc_num_parks() {
+        NUM_PARK.fetch_add(1, Relaxed);
+    }
+
+    pub(crate) fn inc_num_polls() {
+        NUM_POLLS.fetch_add(1, Relaxed);
+    }
+
+    pub(crate) fn inc_num_lifo_polls() {
+        NUM_LIFO_POLLS.fetch_add(1, Relaxed);
+    }
 }
 
 #[cfg(not(tokio_internal_mt_counters))]
 mod imp {
     pub(crate) fn inc_num_inc_notify_local() {}
+    pub(crate) fn inc_num_notify_remote() {}
     pub(crate) fn inc_num_unparks_local() {}
     pub(crate) fn inc_num_maintenance() {}
     pub(crate) fn inc_lifo_schedules() {}
     pub(crate) fn inc_lifo_capped() {}
     pub(crate) fn inc_num_steals() {}
+    pub(crate) fn inc_num_overflows() {}
+    pub(crate) fn inc_num_parks() {}
+    pub(crate) fn inc_num_polls() {}
+    pub(crate) fn inc_num_lifo_polls() {}
 }
 
 #[derive(Debug)]

tokio/src/runtime/scheduler/multi_thread/queue.rs

@@ -204,11 +204,13 @@ impl<T> Local<T> {
                 // There is capacity for the task
                 break tail;
             } else if steal != real {
+                super::counters::inc_num_overflows();
                 // Concurrently stealing, this will free up capacity, so only
                 // push the task onto the inject queue
                 overflow.push(task);
                 return;
             } else {
+                super::counters::inc_num_overflows();
                 // Push the current task and half of the queue into the
                 // inject queue.
                 match self.push_overflow(task, real, tail, overflow, stats) {

tokio/src/runtime/scheduler/multi_thread/worker.rs

@@ -696,6 +696,7 @@ impl Worker {
             if !cx.defer.borrow().is_empty() {
                 core = n!(self.park_yield(cx, core));
             } else {
+                super::counters::inc_num_parks();
                 core = n!(self.park(cx, core));
             }
         }
@@ -789,7 +790,8 @@ impl Worker {
             .take_local()
             .or_else(|| core.run_queue.pop())
             */
-        self.next_lifo_task(cx, core).or_else(|| core.run_queue.pop())
+        self.next_lifo_task(cx, core)
+            .or_else(|| core.run_queue.pop())
     }
 
     fn next_lifo_task(&self, cx: &Context, core: &mut Core) -> Option<Notified> {
@@ -896,6 +898,7 @@ impl Worker {
 
         // Run the task
         coop::budget(|| {
+            super::counters::inc_num_polls();
             task.run();
             let mut lifo_polls = 0;
 
@@ -956,6 +959,7 @@ impl Worker {
                 // Run the LIFO task, then loop
                 *cx.core.borrow_mut() = Some(core);
                 let task = cx.shared().owned.assert_owner(task);
+                super::counters::inc_num_lifo_polls();
                 task.run();
             }
         })
@@ -1383,6 +1387,7 @@ impl Shared {
     }
 
     fn schedule_remote(&self, task: Notified) {
+        super::counters::inc_num_notify_remote();
         self.scheduler_metrics.inc_remote_schedule_count();
 
         let mut synced = self.synced.lock();