diff --git a/src/logservice/palf/election/interface/election.h b/src/logservice/palf/election/interface/election.h
index f214cd7abd..e1f30c3d98 100644
--- a/src/logservice/palf/election/interface/election.h
+++ b/src/logservice/palf/election/interface/election.h
@@ -105,7 +105,7 @@ inline int64_t get_monotonic_ts()
 extern int64_t INIT_TS;
 extern ObOccamTimer GLOBAL_REPORT_TIMER;// used to report election event to inner table
 
-inline int GLOBAL_INIT_ELECTION_MODULE(const int64_t queue_size_square_of_2 = 14)
+inline int GLOBAL_INIT_ELECTION_MODULE(const int64_t queue_size_square_of_2 = 10)
 {
   int ret = common::OB_SUCCESS;
   static int64_t call_times = 0;
diff --git a/src/share/ob_event_history_table_operator.cpp b/src/share/ob_event_history_table_operator.cpp
index 93ddae2d18..3f6fb79e29 100644
--- a/src/share/ob_event_history_table_operator.cpp
+++ b/src/share/ob_event_history_table_operator.cpp
@@ -184,7 +184,7 @@ int ObEventHistoryTableOperator::init(common::ObMySQLProxy &proxy)
     LOG_WARN("init twice", K(ret));
   } else {
     const int64_t thread_count = 1;
-    const int64_t queue_size_square_of_2 = 14;
+    const int64_t queue_size_square_of_2 = 10;
     if (OB_FAIL(event_queue_.init(thread_count, "EvtHisUpdTask", TASK_QUEUE_SIZE, TASK_MAP_SIZE,
         TOTAL_LIMIT, HOLD_LIMIT, PAGE_SIZE))) {
       LOG_WARN("task_queue_ init failed", K(thread_count), LITERAL_K(TASK_QUEUE_SIZE),
diff --git a/src/share/ob_occam_thread_pool.h b/src/share/ob_occam_thread_pool.h
index fca91024c6..990c361a16 100644
--- a/src/share/ob_occam_thread_pool.h
+++ b/src/share/ob_occam_thread_pool.h
@@ -49,7 +49,7 @@ struct DefaultAllocator : public ObIAllocator {
 #ifdef UNIITTEST_DEBUG
     total_alive_num++;
 #endif
-    return ob_malloc(size, SET_USE_500("OccamThreadPool"));
+    return share::mtl_malloc(size, "OccamThreadPool");
   }
   void* alloc(const int64_t size, const ObMemAttr &attr) override {
     UNUSED(attr);
@@ -59,7 +59,7 @@ struct DefaultAllocator : public ObIAllocator {
 #ifdef UNIITTEST_DEBUG
     total_alive_num--;
 #endif
-    ob_free(ptr);
+    share::mtl_free(ptr);
   }
 #ifdef UNIITTEST_DEBUG
   int total_alive_num = 0;
@@ -200,7 +200,7 @@ public:
     is_inited_(false),
     is_stopped_(false) {}
   ~ObOccamThreadPool() { destroy(); }
-  int init(int64_t thread_num, int64_t queue_size_square_of_2 = 14)
+  int init(int64_t thread_num, int64_t queue_size_square_of_2 = 10)
   {
     int ret = OB_SUCCESS;
     if (is_inited_) {
@@ -489,7 +489,7 @@ public:
   ObOccamThreadPool() :
     thread_num_(0),
     queue_size_square_of_2_(0) {}
-  int init_and_start(int thread_num, int queue_size_square_of_2 = 14)
+  int init_and_start(int thread_num, int queue_size_square_of_2 = 10)
   {
     int ret = OB_SUCCESS;
     ret = ob_make_shared<occam::ObOccamThreadPool>(thread_pool_);
diff --git a/src/share/ob_occam_timer.h b/src/share/ob_occam_timer.h
index 4566a49dda..b364ace1ed 100644
--- a/src/share/ob_occam_timer.h
+++ b/src/share/ob_occam_timer.h
@@ -551,7 +551,7 @@ public:
   int init_and_start(const int64_t worker_number,
                      const int64_t precision,
                      const char *name,
-                     const int64_t queue_size_square_of_2 = 14)
+                     const int64_t queue_size_square_of_2 = 10)
   {
     TIMEGUARD_INIT(OCCAM, 100_ms);
     int ret = OB_SUCCESS;