diff --git a/a8/perfmonitor.cc b/a8/perfmonitor.cc
index ef74c3a..a292a60 100644
--- a/a8/perfmonitor.cc
+++ b/a8/perfmonitor.cc
@@ -1,6 +1,8 @@
 #include <a8/a8.h>
 #include <a8/perfmonitor.h>
 
+#include <mutex>
+
 namespace a8
 {
 
@@ -10,10 +12,57 @@ namespace a8
 
     void PerfMonitor::Init()
     {
+        mutex_ = std::make_shared<std::mutex>();
     }
 
     void PerfMonitor::UnInit()
     {
     }
 
+    long long PerfMonitor::AddV(const std::string key, long long val)
+    {
+        long long result = 0;
+        mutex_->lock();
+        auto itr = dyn_hash_.find(key);
+        if (itr == dyn_hash_.end()) {
+            dyn_hash_[key] = val;
+            result = val;
+        } else {
+            itr->second = itr->second + val;
+            result = itr->second;
+        }
+        mutex_->unlock();
+        return result;
+    }
+
+    long long PerfMonitor::SubV(const std::string key, long long val)
+    {
+        return AddV(key, -val);
+    }
+
+    void PerfMonitor::SetV(const std::string key, long long val)
+    {
+        mutex_->lock();
+        dyn_hash_[key] = val;
+        mutex_->unlock();
+    }
+
+    long long PerfMonitor::GetV(const std::string key)
+    {
+        long long result = 0;
+        mutex_->lock();
+        auto itr = dyn_hash_.find(key);
+        if (itr != dyn_hash_.end()) {
+            result = itr->second;
+        }
+        mutex_->unlock();
+        return result;
+    }
+
+    void PerfMonitor::Dump()
+    {
+        mutex_->lock();
+        mutex_->unlock();
+    }
+
 }
diff --git a/a8/perfmonitor.h b/a8/perfmonitor.h
index 9d2db44..86ae61f 100644
--- a/a8/perfmonitor.h
+++ b/a8/perfmonitor.h
@@ -15,12 +15,21 @@ namespace a8
         void Init();
         void UnInit();
 
+        long long AddV(const std::string key, long long val);
+        long long SubV(const std::string key, long long val);
+        void SetV(const std::string key, long long val);
+        long long GetV(const std::string key);
+        void Dump();
+
     public:
         long long send_eagain_times = 0;
         long long recv_eagain_times = 0;
         long long max_send_time = 0;
         long long max_recv_time = 0;
 
+    private:
+        std::shared_ptr<std::mutex> mutex_;
+        std::map<std::string, long long> dyn_hash_;
     };
 
 }