diff --git a/timing/rob/rob.go b/timing/rob/rob.go
index 4ba4a866..f439d408 100644
--- a/timing/rob/rob.go
+++ b/timing/rob/rob.go
@@ -118,9 +118,6 @@ func (b *ReorderBuffer) discardTransactions(
 	b.toBottomReqIDToTransactionTable = make(map[string]*list.Element)
 	b.transactions.Init()
 	b.controlPort.Retrieve(now)
-
-	// fmt.Printf("%.10f, %s, rob flushed\n", now, b.Name())
-
 	return true
 }
 
@@ -196,16 +193,13 @@ func (b *ReorderBuffer) topDown(now sim.VTimeInSec) bool {
 	req := item.(mem.AccessReq)
 	if b.isFull() {
 		tracing.TraceDelay(req, b, b.topPort.Name(), now, "Delay", "Resources/storage not available", "rob")
-		// 0506 b.topPort.Name() -> b.Name()+".Buffer"
 		return false
 	}
-	// 加progress 记时间
 	trans := b.createTransaction(req)
 
 	trans.reqToBottom.Meta().Src = b.bottomPort
 	trans.reqToBottom.Meta().SendTime = now
 	err := b.bottomPort.Send(trans.reqToBottom)
-	// 0506 这是send to bottomPort的意思 ，而不是 从 bottomPort send吧？
 	if err != nil {
 		tracing.TraceDelay(req, b, b.topPort.Name(), now, "Delay", "Port network not available", "rob")
 		return false
@@ -213,7 +207,6 @@ func (b *ReorderBuffer) topDown(now sim.VTimeInSec) bool {
 
 	b.topPort.Retrieve(now)
 	tracing.TraceReqReceive(req, b)
-	// 0506 一个新的req_in 产生了！但它的req_out什么时候出现呢？
 	trans.reqOutTaskID = req.Meta().ID+"_req_out";
 
 	currentProgressID := req.Meta().ID+"_"+b.topPort.Name();
@@ -222,17 +215,10 @@ func (b *ReorderBuffer) topDown(now sim.VTimeInSec) bool {
 	tracing.TraceDependency(currentProgressID, b, dependentIDs)
 
 
-	parentTaskID := tracing.MsgIDAtReceiver(req, b); // 0506 这是个req_in
+	parentTaskID := tracing.MsgIDAtReceiver(req, b);
 	tracing.TraceReqInitiate(trans.reqToBottom, b,
 		parentTaskID)
-	// taskID := tracing.TraceReqInitiate(trans.reqToBottom, b,
-	// 	parentTaskID)
-	// 它的req_out 出现了！但这其中似乎没有任何delay的空间？
 	trans.reqInTaskID = parentTaskID;
-	
-	//0506 从 req_in发下去了，并req_out那条bar也建立了
-	// progressID := req.Meta().ID+"_"+b.topPort.Name();
-	// tracing.TraceProgress(progressID, trans.reqInTaskID, b, now, "rob", "Initiate request");
 	b.addTransaction(trans)
 
 	return true
@@ -246,49 +232,21 @@ func (b *ReorderBuffer) parseBottom(now sim.VTimeInSec) bool {
 	}
 
 	rsp := item.(mem.AccessRsp)
-	rspTo := rsp.GetRspTo() //0506 ID of corresponding task that would receive the response
+	rspTo := rsp.GetRspTo()
 	transElement, found := b.toBottomReqIDToTransactionTable[rspTo]
 
 	if found {
-		//0506 这里found了 所以就把这个transaction完成
 		trans := transElement.Value.(*transaction)
 		trans.rspFromBottom = rsp
 		tracing.TraceReqFinalize(trans.reqToBottom, b) 
-		// taskID := tracing.TraceReqFinalize(trans.reqToBottom, b) 
-		// 0506 terminates the message task。sender receive response那这算是 发出response的task还是收到response的task的step呢？
-		// receiverTaskID := fmt.Sprintf("%s@%s", rspTo, b.Name()); // 0506 cannot directly use tracing.MsgIDAtReceiver(rsp, b); 因为是rspTo 在receive
 		
 		transactionProgressID := sim.GetIDGenerator().Generate()
-		// tracing.TraceProgress(transactionProgressID, trans.reqOutTaskID, b, now, "rob") 
 		tracing.TraceProgress(transactionProgressID, trans.reqInTaskID, b, now, "rob", "Data not available") //0506
 		dependentIDs := b.PrintParseBottomTransactions();
 		tracing.TraceDependency(transactionProgressID, b, dependentIDs);
-
-		//????
 	}
-	// 0506 那如果没有 found呢？就不用end message了？因为没有message task可end？就看看bottom port里有什么就拿什么
-	// 没found,就被discard (page migration相关 不用考虑)
 
 	b.bottomPort.Retrieve(now)
-	// msg := b.bottomPort.Retrieve(now)
-	// 这里是说 bottomPort就紧接着那一个新的任务可以下次输出,所以这里不能算一个progress
-	// 0506 这里和上面的 b.topPort.Retrieve(now)对比 为什么retrieve之后没有再建一个新的task？难道是完成了当时的req_out task?
-	// 0506 为什么msg.RespondTo() 的ID和rspTo的id不一样？
-	// 查询了一下trace结果，好像并没有msg.RespondTo()的ID对应的task
-
-
-	// tracing.TraceDelay(rsp, b, b.bottomPort.Name(), now, "Step", "", "rob")
-	// dependentIDs := extractIDs(b.bottomPort.GetAllBufferElements());
-	// tracing.TraceDependency(rsp, b, dependentIDs)
-
-	// bottomPortProgressID := sim.GetIDGenerator().Generate();
-	// tracing.TraceProgress(bottomPortProgressID, "", b, now, "rob")
-	// dependentIDs := extractIDs(b.bottomPort.GetAllBufferElements(), b.bottomPort.Name());
-	// tracing.TraceDependency(bottomPortProgressID, b, dependentIDs)
-
-	// dependeIDs2 := b.PrintParseBottomTransactions();
-	// tracing.TraceDependency(rsp, b, dependeIDs2)
-
 
 	return true
 }
@@ -303,14 +261,13 @@ func (b *ReorderBuffer) bottomUp(now sim.VTimeInSec) bool {
 
 	trans := elem.Value.(*transaction)
 	if trans.rspFromBottom == nil {
-		tracing.TraceDelay(trans.reqFromTop, b, b.bottomPort.Name(), now, "Delay", "data not available", "rob") //???
-		// tracing.TraceDelay(now, b, "rob") // Jijie: add id, data not available
+		tracing.TraceDelay(trans.reqFromTop, b, b.bottomPort.Name(), now, "Delay", "data not available", "rob")
+		// tracing.TraceDelay(now, b, "rob") //TODO: add id, data not available
 		return false
 	}
 	transactionProgressID := sim.GetIDGenerator().Generate();
-	tracing.TraceProgress(transactionProgressID, trans.reqInTaskID, b, now, "rob", "Data not available") // 改成记录第一次成功的时间， 判断有没有记录过
+	tracing.TraceProgress(transactionProgressID, trans.reqInTaskID, b, now, "rob", "Data not available") 
 
-	//0506有来自bottomport的response了，可以往上发了
 
 	rsp := b.duplicateRsp(trans.rspFromBottom, trans.reqFromTop.Meta().ID)
 	rsp.Meta().Dst = trans.reqFromTop.Meta().Src
@@ -318,28 +275,20 @@ func (b *ReorderBuffer) bottomUp(now sim.VTimeInSec) bool {
 	rsp.Meta().SendTime = now
 
 	err := b.topPort.Send(rsp)
-	//0506 应该要往上发了 从topPort send出去？ 不是应该send 到topPort吗?
 	if err != nil {
 		// Port network not available
-		tracing.TraceDelay(trans.rspFromBottom, b, b.topPort.Name(), now, "Delay", "Port network not available", "rob") //???
+		tracing.TraceDelay(trans.rspFromBottom, b, b.topPort.Name(), now, "Delay", "Port network not available", "rob")
 		fmt.Printf("Delay, no available top port: %.20f\n", now)
 		return false
 	}
-	//0506下面往上发完了 ？ 上面收完了？上面发完了？
-	// tracing.TraceDelay(trans.rspFromBottom, b, "", now, "Step", "", "rob") //  b.topPort.Name() 变成空着 0318 done
 	transactionProgressID = sim.GetIDGenerator().Generate();
-	// tracing.TraceProgress(transactionProgressID,  trans.reqOutTaskID, b, now, "rob")
-	// receiverTaskID := rsp.GetRspTo();
-	// tracing.TraceProgress(transactionProgressID, receiverTaskID, b, now, "rob")
-	tracing.TraceProgress(transactionProgressID, trans.reqInTaskID, b, now, "rob", "Port network not available")//050666
+	tracing.TraceProgress(transactionProgressID, trans.reqInTaskID, b, now, "rob", "Port network not available")
 	dependentIDs := b.PrintBottomUpTransactions();
-	// dependentIDs := extractIDs(b.topPort.GetAllBufferElements()); // b.transactions Jijie todo 0318 遍历 并且反过来
 	tracing.TraceDependency(transactionProgressID, b, dependentIDs)
 	
 
 	b.deleteTransaction(elem)
 	tracing.TraceReqComplete(trans.reqFromTop, b)
-	// 0506此transaction正式完结，需要一个额外的progress吗？
 
 
 	return true