diff --git a/ODLA/platforms/odla_popart/odla_compute.cc b/ODLA/platforms/odla_popart/odla_compute.cc
index 7ed3d0e0e..24ef24494 100644
--- a/ODLA/platforms/odla_popart/odla_compute.cc
+++ b/ODLA/platforms/odla_popart/odla_compute.cc
@@ -240,6 +240,7 @@ odla_status odla_DestroyComputation(odla_computation comp) {
   }
   popart::logging::warn("reset config state, comp: {}", comp);
   PopartConfig::instance()->reset_init_state();
+  popart::logging::warn("reset config state DONE, comp: {}", comp);
 
   return ODLA_SUCCESS;
 }
diff --git a/ODLA/platforms/odla_popart/odla_popart.cc b/ODLA/platforms/odla_popart/odla_popart.cc
index 3c2ce3e74..73078a49e 100644
--- a/ODLA/platforms/odla_popart/odla_popart.cc
+++ b/ODLA/platforms/odla_popart/odla_popart.cc
@@ -121,6 +121,27 @@ void compute_loop(odla_computation comp) {
 #undef RETURN_ERROR
 #define RETURN_ERROR(ERR_CODE) return ERR_CODE;
 
+void _odla_computation::release_session() {
+  if (nullptr == session)
+    popart::logging::warn("session is nullptr when try to release it");
+  else if (session->getDevice().getDeviceInfo() == nullptr)
+    popart::logging::warn(
+        "session->getDevice().getDeviceInfo() is nullptr when try to release "
+        "it");
+  else {
+    popart::logging::warn(
+        "Calling session->getDevice().getDeviceInfo()->detach() to detach the "
+        "device when QManager Status is {}",
+        QManager::instance()->get_status());
+    session->getDevice().getDeviceInfo()->detach();
+    popart::logging::warn("The computation:{} session:{} detached from device",
+                          this, session.get());
+  }
+  if (session != nullptr) session.reset();
+  assert(session == nullptr);
+  popart::logging::warn("The computation:{} session has been reset", this);
+}
+
 odla_status _odla_computation::compile_and_export() {
   odla_status ret_value = ODLA_SUCCESS;
   POPLAR_TRY
@@ -213,7 +234,7 @@ odla_status _odla_computation::init(bool is_compile) {
                                  popart::AnchorReturnType("All"));
       // Acquire IPU
       if (opts.use_ipu_model) {
-        popart::logging::info("Using IPU Model to run.");
+        popart::logging::warn("Using IPU Model to run.");
         std::map<std::string, std::string> deviceOpts{
             {"numIPUs", std::to_string(opts.ipu_num)}, {"tilesPerIPU", "1216"}};
         device =
@@ -230,6 +251,7 @@ odla_status _odla_computation::init(bool is_compile) {
         throw std::runtime_error(
             "Failed to get a device when initializing odla_computation");
       }
+      popart::logging::warn("Device acquired to run model");
 
       // Create and config SessionOptions
       set_session_opts();
@@ -255,6 +277,9 @@ odla_status _odla_computation::init(bool is_compile) {
       // Create InferenceSession
       new_session = std::move(popart::InferenceSession::createFromOnnxModel(
           proto, data_flow, device, popart::InputShapeInfo(), session_opts_));
+      popart::logging::warn(
+          "New session: {} has been created for computation: {}",
+          new_session.get(), this);
 
       if (!is_compile) {
         if (PopartConfig::instance()->load_or_save_cache()) {
@@ -297,7 +322,9 @@ odla_status _odla_computation::init(bool is_compile) {
         is_compile_only_ = true;
       }
       // set session after all initialization done.
+      popart::logging::warn("Moving new_session to session: {}", session.get());
       session = std::move(new_session);
+      popart::logging::warn("Moved new_session to session: {}", session.get());
       // Thread must be started after all initialization done
       if (!is_compile) {
         ExecutionMode mode = PopartConfig::instance()->execution_mode();
@@ -404,7 +431,7 @@ bool _odla_computation::hold() {
   } else {
     std::stringstream ss_holder;
     ss_holder << thread_id_of_holder;
-    popart::logging::warn(
+    popart::logging::info(
         "The odla_computation {} has been held by thread: {}"
         ", when thread {} try to hold it.",
         this, thread_id_of_holder, this_thread_id);
diff --git a/ODLA/platforms/odla_popart/odla_popart.h b/ODLA/platforms/odla_popart/odla_popart.h
index 331a82dfa..37bcfbf9b 100644
--- a/ODLA/platforms/odla_popart/odla_popart.h
+++ b/ODLA/platforms/odla_popart/odla_popart.h
@@ -151,17 +151,7 @@ struct _odla_computation {
   inline Execution* executor() { return executor_; }
   inline bool is_done() { return thread_state_ != RUNNING; }
   inline bool is_compile_only() { return is_compile_only_; }
-  inline void release_session() {
-    if (session != nullptr) {
-      session->getDevice().getDeviceInfo()->detach();
-      popart::logging::warn(
-          "The computation:{} session:{} detached from device", this,
-          session.get());
-      session.reset();
-      assert(session == nullptr);
-      popart::logging::warn("The computation:{} session has been reset", this);
-    }
-  }
+  void release_session();
   inline void set_thread_run() {
     std::unique_lock<std::mutex> lock(thread_done_mutex_);
     thread_state_ = RUNNING;
diff --git a/ODLA/platforms/odla_popart/popart_config.h b/ODLA/platforms/odla_popart/popart_config.h
index 1a676ccaf..512705f99 100644
--- a/ODLA/platforms/odla_popart/popart_config.h
+++ b/ODLA/platforms/odla_popart/popart_config.h
@@ -115,7 +115,7 @@ class PopartConfig {
       std::lock_guard<std::mutex> guard(config_mutex_);
       if (inited_) {
         inited_ = false;
-        if (cache_fs->is_open()) {
+        if (cache_fs && cache_fs->is_open()) {
           cache_fs->close();
           cache_fs->clear();
         }