diff --git a/serving/processor/serving/model_instance.cc b/serving/processor/serving/model_instance.cc
index d4a10a97ec6..fec822f72be 100644
--- a/serving/processor/serving/model_instance.cc
+++ b/serving/processor/serving/model_instance.cc
@@ -364,10 +364,10 @@ Status LocalSessionInstance::Warmup(
   int left_try_count = WARMUP_COUNT;
   while (left_try_count > 0) {
     if (warmup_session) {
-      s = warmup_session->LocalPredict(
+      s = warmup_session->Warmup(
           call.request, call.response);
     } else {
-      s = session_mgr_->LocalPredict(
+      s = session_mgr_->Warmup(
           call.request, call.response);
     }
     if (!s.ok()) return s;
@@ -563,11 +563,11 @@ Status RemoteSessionInstance::Warmup(
   int left_try_count = WARMUP_COUNT;
   while (left_try_count > 0) {
     if (warmup_session) {
-      s = warmup_session->LocalPredict(
-          call.request, call.response);
+      s = warmup_session->Warmup(
+          call.request, call.response, false);
     } else {
-      s = session_mgr_->LocalPredict(
-          call.request, call.response);
+      s = session_mgr_->Warmup(
+          call.request, call.response, false);
     }
     if (!s.ok()) return s;
 
diff --git a/serving/processor/serving/model_session.cc b/serving/processor/serving/model_session.cc
index 24400c733dc..534c0e094d2 100644
--- a/serving/processor/serving/model_session.cc
+++ b/serving/processor/serving/model_session.cc
@@ -262,6 +262,16 @@ int ModelSession::GetServingSessionId() {
 }
 
 Status ModelSession::Predict(Request& req, Response& resp) {
+  return InternalPredict(req, resp, GetServingSessionId());
+}
+
+Status ModelSession::Predict(Request& req, Response& resp,
+                             int sess_id) {
+  return InternalPredict(req, resp, sess_id);
+}
+
+Status ModelSession::InternalPredict(Request& req, Response& resp,
+                                     int sess_id) {
   if (is_local_) {
     return Status(error::Code::INTERNAL,
         "Local sparse storage, please use LocalPredict.");
@@ -278,17 +288,31 @@ Status ModelSession::Predict(Request& req, Response& resp) {
     // TODO: which session selected to run on, add some policy here
     status = session_group_->Run(run_options, req.inputs,
         req.output_tensor_names, {}, &resp.outputs,
-        &run_metadata, GetServingSessionId());
+        &run_metadata, sess_id);
     Tracer::GetTracer()->GenTimeline(run_metadata);
   } else {
     status = session_group_->Run(req.inputs, req.output_tensor_names,
-        {}, &resp.outputs, GetServingSessionId());
+        {}, &resp.outputs, sess_id);
   }
   --counter_;
   return status;
 }
 
-Status ModelSession::LocalPredict(Request& req, Response& resp) {
+Status ModelSession::LocalPredict(Request& req,
+                                  Response& resp) {
+  return InternalLocalPredict(req, resp,
+      GetServingSessionId());
+}
+
+Status ModelSession::LocalPredict(Request& req,
+                                  Response& resp,
+                                  int sess_id) {
+  return InternalLocalPredict(req, resp, sess_id);
+}
+
+Status ModelSession::InternalLocalPredict(Request& req,
+                                          Response& resp,
+                                          int sess_id) {
   if (!is_local_) {
     return Status(error::Code::INTERNAL,
         "Remote sparse storage, please use Predict.");
@@ -302,16 +326,31 @@ Status ModelSession::LocalPredict(Request& req, Response& resp) {
     // TODO: which session selected to run on, add some policy here
     status = session_group_->Run(run_options, req.inputs,
         req.output_tensor_names, {}, &resp.outputs,
-        &run_metadata, GetServingSessionId());
+        &run_metadata, sess_id);
     Tracer::GetTracer()->GenTimeline(run_metadata); 
   } else {
     status = session_group_->Run(req.inputs, req.output_tensor_names,
-        {}, &resp.outputs, GetServingSessionId());
+        {}, &resp.outputs, sess_id);
   }
   --counter_;
   return status;
 }
 
+Status ModelSession::Warmup(Request& req, Response& resp, bool local) {
+  int N = session_group_->GetSessionNum();
+  for (int i = 0; i < N; ++i) {
+    Status s;
+    if (local) {
+      s = LocalPredict(req, resp, i);
+    } else {
+      s = Predict(req, resp, i);
+    }
+    if (!s.ok()) return s;
+  }
+
+  return Status::OK();
+}
+
 Status ModelSessionMgr::Predict(Request& req, Response& resp) {
   return serving_session_->Predict(req, resp);
 }
@@ -320,6 +359,10 @@ Status ModelSessionMgr::LocalPredict(Request& req, Response& resp) {
   return serving_session_->LocalPredict(req, resp);
 }
 
+Status ModelSessionMgr::Warmup(Request& req, Response& resp, bool local) {
+  return serving_session_->Warmup(req, resp, local);
+}
+
 Status ModelSessionMgr::CreateModelSession(
     const Version& version, const char* ckpt_name,
     IFeatureStoreMgr* sparse_storage, bool is_incr_ckpt,
diff --git a/serving/processor/serving/model_session.h b/serving/processor/serving/model_session.h
index 394582657ca..a54952318ba 100644
--- a/serving/processor/serving/model_session.h
+++ b/serving/processor/serving/model_session.h
@@ -33,10 +33,13 @@ struct ModelSession {
   virtual ~ModelSession();
 
   Status Predict(Request& req, Response& resp);
+  Status Predict(Request& req, Response& resp, int sess_id);
   Status LocalPredict(Request& req, Response& resp);
+  Status LocalPredict(Request& req, Response& resp, int sess_id);
   Version GetVersion() {return version_;}
   void UpdateVersion(const Version& v) { version_ = v; }
   Session* GetSession();
+  Status Warmup(Request& req, Response& resp, bool local=true);
 
   SessionGroup* session_group_ = nullptr;
   SelectSessionPolicy select_session_policy_ =
@@ -54,6 +57,8 @@ struct ModelSession {
 
  private:
   int GetServingSessionId();
+  Status InternalPredict(Request& req, Response& resp, int sess_id);
+  Status InternalLocalPredict(Request& req, Response& resp, int sess_id);
 };
 
 class ModelSessionMgr {
@@ -64,6 +69,7 @@ class ModelSessionMgr {
 
   Status Predict(Request& req, Response& resp);
   Status LocalPredict(Request& req, Response& resp);
+  Status Warmup(Request& req, Response& resp, bool local=true);
 
   Status CreateModelSession(
       const Version& version,