diff --git a/visualdl/backend/logic/pybind.cc b/visualdl/backend/logic/pybind.cc
index 9b7f67727afc657b21b4274bf79cb6ffae94f4c7..4b114a53344c91102876b008f95c77ee797bfe05 100644
--- a/visualdl/backend/logic/pybind.cc
+++ b/visualdl/backend/logic/pybind.cc
@@ -62,7 +62,7 @@ PYBIND11_PLUGIN(core) {
         &vs::start_write_service,
         "global information-maintainer object.");
   m.def("im", &vs::im);
-  m.def("stop_threads", &vs::StopThreads);
+  m.def("stop_threads", &vs::stop_threads);
 
 // interfaces for components
 #define ADD_SCALAR_TYPED_INTERFACE(T, name__)                             \
diff --git a/visualdl/backend/logic/sdk.h b/visualdl/backend/logic/sdk.h
index c56323a45b7e6549abac95b7c10af94dcd55e91d..9948ab709896784cea1c9294a2e4fac0586cee99 100644
--- a/visualdl/backend/logic/sdk.h
+++ b/visualdl/backend/logic/sdk.h
@@ -109,7 +109,7 @@ public:
     IM::Global().storage().mutable_data()->clear_tablets();
   }
 
-  void PersistToDisk() const;
+  void PersistToDisk() const { IM::Global().PersistToDisk(); }
 };
 
 namespace components {
@@ -142,11 +142,23 @@ private:
 
 }  // namespace components
 
-static ImHelper &get_im() {
+static ImHelper &im() {
   static ImHelper im;
   return im;
 }
 
+static void start_read_service(const std::string &dir) {
+  IM::Global().SetPersistDest(dir);
+  IM::Global().MaintainRead();
+}
+
+static void start_write_service(const std::string &dir) {
+  IM::Global().SetPersistDest(dir);
+  IM::Global().MaintainWrite();
+}
+
+static void stop_threads() { cc::PeriodExector::Global().Quit(); }
+
 }  // namespace visualdl
 
 #endif  // VISUALDL_BACKEND_LOGIC_SDK_H
diff --git a/visualdl/backend/storage/CMakeLists.txt b/visualdl/backend/storage/CMakeLists.txt
index 2885b845247eb72b8a4f746eb6b80ba0ec6d2b79..090f162ecec3667f6bf47e47c5a10a8215385142 100644
--- a/visualdl/backend/storage/CMakeLists.txt
+++ b/visualdl/backend/storage/CMakeLists.txt
@@ -4,5 +4,5 @@ add_library(storage_proto ${PROTO_SRCS})
 add_dependencies(storage_proto protobuf)
 
 ## add storage as target
-add_library(storage storage.cc ${PROTO_SRCS} ${PROTO_HDRS})
+add_library(storage storage.cc storage.h ${PROTO_SRCS} ${PROTO_HDRS})
 add_dependencies(storage storage_proto)