diff --git a/visualdl/backend/logic/im.cc b/visualdl/backend/logic/im.cc
index e33ac2768bd5325051f9a71ec6be880389c06dcd..971a9f48f7355a802200341540a3aada82eb464a 100644
--- a/visualdl/backend/logic/im.cc
+++ b/visualdl/backend/logic/im.cc
@@ -25,20 +25,18 @@ int ReserviorSample(int num_samples, int num_records) {
   return -1;
 }
 
-void InformationMaintainer::SetPersistDest(const std::string &path) {
+void IM::SetPersistDest(const std::string &path) {
   CHECK(storage_->mutable_data()->dir().empty())
       << "duplicate set storage's path";
   storage_->mutable_data()->set_dir(path);
 }
 
-storage::Tablet *InformationMaintainer::AddTablet(const std::string &tag,
-                                                  int num_samples) {
+storage::Tablet *IM::AddTablet(const std::string &tag, int num_samples) {
   auto tablet = storage_->NewTablet(tag, num_samples);
   return tablet;
 }
 
-void InformationMaintainer::AddRecord(const std::string &tag,
-                                      const storage::Record &data) {
+void IM::AddRecord(const std::string &tag, const storage::Record &data) {
   auto *tablet = storage_->tablet(tag);
   CHECK(tablet) << "no tablet called " << tag;
 
@@ -65,14 +63,14 @@ void InformationMaintainer::AddRecord(const std::string &tag,
   tablet->set_total_records(num_records + 1);
 }
 
-void InformationMaintainer::Clear() {
+void IM::Clear() {
   auto *data = storage().mutable_data();
   data->clear_tablets();
   data->clear_dir();
   data->clear_timestamp();
 }
 
-void InformationMaintainer::PersistToDisk() {
+void IM::PersistToDisk() {
   CHECK(!storage_->data().dir().empty()) << "path of storage should be set";
   // TODO make dir first
   // MakeDir(storage_.data().dir());
diff --git a/visualdl/backend/logic/im.h b/visualdl/backend/logic/im.h
index 588540c7eac79b8bf224ab209db7cbdc3585cd60..603f4294d61828b5ad2de5f73bb8b4c7bf9588cb 100644
--- a/visualdl/backend/logic/im.h
+++ b/visualdl/backend/logic/im.h
@@ -10,7 +10,7 @@
 namespace visualdl {
 
 /*
- * InformationMaintainer(IM) maintain the Storage singleton in memory,
+ * IM(IM) maintain the Storage singleton in memory,
  * pre-compute some the statistical information to help visualizaton.
  *
  * There should be two processes and each have an IM, one is the web server
@@ -24,9 +24,9 @@ namespace visualdl {
  * The SDK's IM will maintain the changes and periodically write to disk, and
  * the web server's IM will periodically read latest storage from disk.
  */
-class InformationMaintainer final {
+class IM final {
 public:
-  InformationMaintainer(StorageBase::Type type = StorageBase::Type::kMemory) {
+  IM(StorageBase::Type type = StorageBase::Type::kMemory) {
     switch (type) {
       case StorageBase::Type::kMemory:
         storage_.reset(new MemoryStorage);
@@ -36,8 +36,8 @@ public:
     }
   }
 
-  static InformationMaintainer &Global() {
-    static InformationMaintainer *x = new InformationMaintainer();
+  static IM &Global() {
+    static IM *x = new IM();
     return *x;
   }
 
diff --git a/visualdl/backend/logic/im_test.cc b/visualdl/backend/logic/im_test.cc
index 183853e501143ffd33714b69c1c02162bf1d6f57..c387565477ee9df0ae8d2872ae6416f79e08ca7e 100644
--- a/visualdl/backend/logic/im_test.cc
+++ b/visualdl/backend/logic/im_test.cc
@@ -8,7 +8,7 @@ class ImTester : public ::testing::Test {
 protected:
   void SetUp() override {}
 
-  InformationMaintainer &im = InformationMaintainer::Global();
+  IM &im = IM::Global();
 };
 
 TEST_F(ImTester, AddTablet) {
diff --git a/visualdl/backend/logic/sdk.cc b/visualdl/backend/logic/sdk.cc
index c676c5505ab215ca6e601b8307af443520238f2f..4ce6362fbcf1e9b5f07d987e7a3988d11888d64e 100644
--- a/visualdl/backend/logic/sdk.cc
+++ b/visualdl/backend/logic/sdk.cc
@@ -60,9 +60,7 @@ std::string TabletHelper::human_readable_buffer() const {
   return buffer;
 }
 
-void ImHelper::PersistToDisk() const {
-  InformationMaintainer::Global().PersistToDisk();
-}
+void ImHelper::PersistToDisk() const { IM::Global().PersistToDisk(); }
 
 // implementations for components
 namespace components {
diff --git a/visualdl/backend/logic/sdk.h b/visualdl/backend/logic/sdk.h
index 5162fee8c0bcae538cabd790d9c68e2361a79dff..963834e825dfca94b7d95164586e18b83b06a89d 100644
--- a/visualdl/backend/logic/sdk.h
+++ b/visualdl/backend/logic/sdk.h
@@ -94,18 +94,16 @@ public:
   ImHelper() {}
 
   StorageHelper storage() {
-    return StorageHelper(
-        InformationMaintainer::Global().storage().mutable_data());
+    return StorageHelper(IM::Global().storage().mutable_data());
   }
   TabletHelper tablet(const std::string &tag) {
-    return TabletHelper(InformationMaintainer::Global().storage().tablet(tag));
+    return TabletHelper(IM::Global().storage().tablet(tag));
   }
   TabletHelper AddTablet(const std::string &tag, int num_samples) {
-    return TabletHelper(
-        InformationMaintainer::Global().AddTablet(tag, num_samples));
+    return TabletHelper(IM::Global().AddTablet(tag, num_samples));
   }
   void ClearTablets() {
-    InformationMaintainer::Global().storage().mutable_data()->clear_tablets();
+    IM::Global().storage().mutable_data()->clear_tablets();
   }
 
   void PersistToDisk() const;
diff --git a/visualdl/backend/storage/storage.cc b/visualdl/backend/storage/storage.cc
index 0350b5c3f26b4414fe644cb723e6bc6a328df030..b74840d14db20ec6e6bd1a10ec55ee09b6526e27 100644
--- a/visualdl/backend/storage/storage.cc
+++ b/visualdl/backend/storage/storage.cc
@@ -1,4 +1,5 @@
 #include <glog/logging.h>
+#include <visualdl/backend/utils/concurrency.h>
 #include <fstream>
 
 #include "visualdl/backend/storage/storage.h"
@@ -72,4 +73,21 @@ void MemoryStorage::LoadFromDisk(const std::string &dir) {
   }
 }
 
+void MemoryStorage::StartReadService() {
+  cc::PeriodExector::task_t task = [this] {
+    LOG(INFO) << "loading from " << storage_.dir();
+    LoadFromDisk(storage_.dir());
+    return true;
+  };
+  cc::PeriodExector::Global()(std::move(task), 2512);
+}
+
+void MemoryStorage::StartWriteSerice() {
+  cc::PeriodExector::task_t task = [this] {
+    LOG(INFO) << "writing to " << storage_.dir();
+    PersistToDisk();
+    return true;
+  };
+  cc::PeriodExector::Global()(std::move(task), 2000);
+}
 }  // namespace visualdl