diff --git a/border-async-trainer/src/async_trainer/base.rs b/border-async-trainer/src/async_trainer/base.rs
index 8384a1f1..16deac03 100644
--- a/border-async-trainer/src/async_trainer/base.rs
+++ b/border-async-trainer/src/async_trainer/base.rs
@@ -304,18 +304,27 @@ where
         info!("Send model info first in AsyncTrainer");
         self.sync(&mut agent);
 
+        let mut ix_opt_buffer_cnt = vec![0; self.n_div_replaybuffer];
+
         info!("Starts training loop");
         loop {
 
             let record = {                
                 let time_tmp = SystemTime::now();
-                let buf = async_buffer.get_buffer_for_opt();
+                let (buf, ix_opt_buffer) = async_buffer.get_buffer_for_opt();
                 let mut buf = buf.lock().unwrap();
-                println!("time get_buffer_for_opt: {}", time_tmp.elapsed().unwrap().as_secs_f32());
+                // println!("time get_buffer_for_opt: {}", time_tmp.elapsed().unwrap().as_secs_f32());
                 
                 let time_tmp = SystemTime::now();
                 let record = agent.opt(&mut buf);
-                println!("time opt: {}", time_tmp.elapsed().unwrap().as_secs_f32());
+                // println!("time opt: {}", time_tmp.elapsed().unwrap().as_secs_f32());
+
+                if record.is_some() {
+                    ix_opt_buffer_cnt[ix_opt_buffer] += 1;
+                    println!("ix_opt_buffer: {}", ix_opt_buffer);    
+                    println!("ix_opt_buffer_cnt: {:?}", ix_opt_buffer_cnt);    
+                }
+
                 record
             };
 
@@ -364,7 +373,7 @@ where
                     info!("Sends the trained model info to ActorManager");
                     self.sync(&agent);
                 }
-                println!("time others: {}", time_tmp.elapsed().unwrap().as_secs_f32());
+                // println!("time others: {}", time_tmp.elapsed().unwrap().as_secs_f32());
             }
         }
         info!("Stopped training loop");
@@ -414,6 +423,8 @@ where
 
     fn ix_push_buffer(&self) -> usize {
         let ixs_free = self.ixs_free_buffer();
+        println!("ixs_free (in push): {:?}", ixs_free);
+
         if ixs_free.len() >= 3 {
             // If there are 3 or more free buffers, use one of the free buffers.
             // This is to leave 2 or more choice when selecting a BUFFER in the OPT.
@@ -434,6 +445,8 @@ where
 
     fn ix_opt_buffer(&self) -> usize {
         let ixs_free = self.ixs_free_buffer();
+        println!("ixs_free (in opt): {:?}", ixs_free);
+
         // println!(
         //     "ixs_free.len() in get_free_buffer_for_opt: {}",
         //     ixs_free.len()
@@ -507,12 +520,18 @@ where
         samples_total: Arc<Mutex<usize>>,
         receiver: Receiver<PushedItemMessage<R::PushedItem>>,
     ) {
+        let mut ix_push_buffer_cnt = vec![0; splitted_buffers.splitted_buffers.len()];
+        
         for msg in receiver.iter() {
             let samples = msg.pushed_items.len();
 
             *samples_total.lock().unwrap() += samples;
     
             let ix_buffer = splitted_buffers.ix_push_buffer();
+            ix_push_buffer_cnt[ix_buffer] += 1;
+            println!("ix_push_buffer: {}", ix_buffer);
+            println!("ix_push_buffer_cnt: {:?}", ix_push_buffer_cnt);
+
             // println!("ix_buffer: {}", ix_buffer);
             let buf = splitted_buffers.splitted_buffers[ix_buffer].clone();
             let (s, r) = unbounded();
@@ -538,12 +557,12 @@ where
         }
     }
 
-    fn get_buffer_for_opt(&self) -> Arc<Mutex<R>> {
+    fn get_buffer_for_opt(&self) -> (Arc<Mutex<R>>, usize) {
         let time_tmp = SystemTime::now();
         let ix_buffer = self.splitted_buffers.ix_opt_buffer();
-        println!("time ix_opt_buffer: {}", time_tmp.elapsed().unwrap().as_secs_f32());
+        // println!("time ix_opt_buffer: {}", time_tmp.elapsed().unwrap().as_secs_f32());
         
-        self.splitted_buffers.splitted_buffers[ix_buffer].clone()
+        (self.splitted_buffers.splitted_buffers[ix_buffer].clone(), ix_buffer)
     }
 
     fn samples_total(&self) -> usize {