diff --git a/src/profiler/profiler.cc b/src/profiler/profiler.cc
index 82d1744d7b47..e6dafb3d0916 100644
--- a/src/profiler/profiler.cc
+++ b/src/profiler/profiler.cc
@@ -205,7 +205,6 @@ void Profiler::DumpProfile(bool peform_cleanup) {
   // If aggregate stats aren't enabled, this won't cause a locked instruction
   std::shared_ptr<AggregateStats> ptr_aggregate_stats = aggregate_stats_.get()
                                                         ? aggregate_stats_ : nullptr;
-  bool first_flag = !first_pass && !num_records_emitted_;
   for (uint32_t i = 0; i < dev_num; ++i) {
     DeviceStats &d = profile_stat[i];
     ProfileStat *_opr_stat;
@@ -213,12 +212,7 @@ void Profiler::DumpProfile(bool peform_cleanup) {
       CHECK_NOTNULL(_opr_stat);
       std::unique_ptr<ProfileStat> opr_stat(_opr_stat);  // manage lifecycle
       opr_stat->process_id_ = i;  // lie and set process id to be the device number
-      if (first_flag) {
-        first_flag = false;
-      } else {
-        file << ",\n";
-      }
-      file << std::endl;
+      file << ",\n" << std::endl;
       opr_stat->EmitEvents(&file);
       ++num_records_emitted_;
       if (ptr_aggregate_stats) {
@@ -231,13 +225,7 @@ void Profiler::DumpProfile(bool peform_cleanup) {
   ProfileStat *_profile_stat;
   while (general_stats_.opr_exec_stats_->try_dequeue(_profile_stat)) {
     CHECK_NOTNULL(_profile_stat);
-
-    if (first_flag) {
-      first_flag = false;
-    } else {
-      file << ",";
-    }
-
+    file << ",";
     std::unique_ptr<ProfileStat> profile_stat(_profile_stat);  // manage lifecycle
     CHECK_NE(profile_stat->categories_.c_str()[0], '\0') << "Category must be set";
     // Currently, category_to_pid_ is only accessed here, so it is protected by this->m_ above
diff --git a/src/profiler/profiler.h b/src/profiler/profiler.h
index 1224231761ba..768a0bc7d711 100644
--- a/src/profiler/profiler.h
+++ b/src/profiler/profiler.h
@@ -130,7 +130,9 @@ struct ProfileStat {
   /* !\brief Process id */
   size_t process_id_ = current_process_id();
 
-  /*! \brief id of thread which operation run on */
+  /*! \brief id of thread which operation run on.
+   *
+   * */
   std::thread::id thread_id_ = std::this_thread::get_id();  // Not yet seen a
                                                             // case where this isn't valid
 
@@ -209,7 +211,7 @@ struct ProfileStat {
           << "        \"ts\": " << ev.timestamp_ << ",\n";
       EmitExtra(os, idx);
       *os << "        \"pid\": " << process_id_ << ",\n"
-          << "        \"tid\": " << thread_id_ << "\n"
+          << "        \"tid\": " << std::hash<std::thread::id>{}(thread_id_) << "\n"
           << "    }\n";
     }
   }
@@ -794,7 +796,7 @@ struct ProfileTask : public ProfileDuration {
     }
     void EmitExtra(std::ostream *os, size_t idx) override {
       DurationStat::EmitExtra(os, idx);
-      *os << "        \"id\": " << thread_id_ << ",\n";
+      *os << "        \"id\": " << std::hash<std::thread::id>{}(thread_id_) << ",\n";
     }
   };