diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5f9725825..a52c72c4f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ Please mark all change in change log and use the ticket from JIRA.
 ## Feature
 
 ## Improvement
+- \#190 - Update default config:use_blas_threshold to 1100 and server version printout to 0.52
 
 ## Task
 
diff --git a/NOTICE.md b/NOTICE.md
index 018e2b80e0..fee2f37a7a 100644
--- a/NOTICE.md
+++ b/NOTICE.md
@@ -8,20 +8,16 @@
 | ------------- | ------------------------------------------------------------ |
 | Apache Arrow  | [Apache License 2.0](https://github.com/apache/arrow/blob/master/LICENSE.txt)                                           |
 | Boost         | [Boost Software License](https://github.com/boostorg/boost/blob/master/LICENSE_1_0.txt)                                       |
-| BZip2         | [BZip2](http://www.bzip.org/)                                             |
 | FAISS         | [MIT](https://github.com/facebookresearch/faiss/blob/master/LICENSE)                                                          |
 | Gtest         | [BSD 3-Clause](https://github.com/google/googletest/blob/master/LICENSE)                                                 |
 | LAPACK        | [LAPACK](https://github.com/Reference-LAPACK/lapack/blob/master/LICENSE)                                                 |
-| LZ4           | [BSD 2-Clause](https://github.com/Blosc/c-blosc/blob/master/LICENSES/LZ4.txt) |
 | MySQLPP       | [LGPL 2.1](https://tangentsoft.com/mysqlpp/artifact/b128a66dab867923)                                                     |
 | OpenBLAS      | [BSD 3-Clause](https://github.com/xianyi/OpenBLAS/blob/develop/LICENSE)                                                 |
 | Prometheus    | [Apache License 2.0](https://github.com/prometheus/prometheus/blob/master/LICENSE)                                           |
-| Snappy        | [BSD](https://github.com/google/snappy/blob/master/COPYING) |
 | SQLite        | [Public Domain](https://www.sqlite.org/copyright.html)       |
 | SQLite-ORM    | [BSD 3-Clause](https://github.com/fnc12/sqlite_orm/blob/master/LICENSE)                                                 |
 | yaml-cpp      | [MIT](https://github.com/jbeder/yaml-cpp/blob/master/LICENSE)                                                          |
 | ZLIB          | [ZLIB](http://zlib.net/zlib_license.html)                    |
-| ZSTD          | [BSD](https://github.com/facebook/zstd/blob/dev/LICENSE)     |
 | libunwind     | [MIT](https://github.com/libunwind/libunwind/blob/master/LICENSE)                                                          |
 | gperftools    | [BSD 3-Clause](https://github.com/gperftools/gperftools/blob/master/COPYING)                                                 |
 | grpc          | [Apache 2.0](https://github.com/grpc/grpc/blob/master/LICENSE)                                                   |
diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 402e65fb10..7acf3062fa 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -44,7 +44,7 @@ if(NOT GIT_BRANCH_NAME STREQUAL "")
     string(REGEX REPLACE "\n" "" GIT_BRANCH_NAME ${GIT_BRANCH_NAME})
 endif()
 
-set(MILVUS_VERSION "0.5.1")
+set(MILVUS_VERSION "${GIT_BRANCH_NAME}")
 string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]" MILVUS_VERSION "${MILVUS_VERSION}")
 
 find_package(ClangTools)
@@ -71,7 +71,7 @@ if(MILVUS_VERSION_MAJOR STREQUAL ""
         OR MILVUS_VERSION_MINOR STREQUAL ""
         OR MILVUS_VERSION_PATCH STREQUAL "")
     message(WARNING "Failed to determine Milvus version from git branch name")
-    set(MILVUS_VERSION "0.5.0")
+    set(MILVUS_VERSION "0.5.2")
 endif()
 
 message(STATUS "Build version = ${MILVUS_VERSION}")
diff --git a/core/conf/server_config.template b/core/conf/server_config.template
index 8dfb30f534..48d29a1096 100644
--- a/core/conf/server_config.template
+++ b/core/conf/server_config.template
@@ -34,7 +34,7 @@ cache_config:
   cache_insert_data: false          # whether to load inserted data into cache, must be a boolean
 
 engine_config:
-  use_blas_threshold: 20            # if nq <  use_blas_threshold, use SSE, faster with fluctuated response times
+  use_blas_threshold: 1100          # if nq <  use_blas_threshold, use SSE, faster with fluctuated response times
                                     # if nq >= use_blas_threshold, use OpenBlas, slower with stable response times
   gpu_search_threshold: 1000        # threshold beyond which the search computation is executed on GPUs only
 
diff --git a/core/src/cache/Cache.h b/core/src/cache/Cache.h
index 62a7f13ca8..d3513032b9 100644
--- a/core/src/cache/Cache.h
+++ b/core/src/cache/Cache.h
@@ -40,12 +40,15 @@ class Cache {
         return usage_;
     }
 
+    // unit: BYTE
     int64_t
     capacity() const {
         return capacity_;
-    }  // unit: BYTE
+    }
+
+    // unit: BYTE
     void
-    set_capacity(int64_t capacity);  // unit: BYTE
+    set_capacity(int64_t capacity);
 
     double
     freemem_percent() const {
@@ -59,16 +62,22 @@ class Cache {
 
     size_t
     size() const;
+
     bool
     exists(const std::string& key);
+
     ItemObj
     get(const std::string& key);
+
     void
     insert(const std::string& key, const ItemObj& item);
+
     void
     erase(const std::string& key);
+
     void
     print();
+
     void
     clear();
 
diff --git a/core/src/cache/CacheMgr.h b/core/src/cache/CacheMgr.h
index f5e04f6509..f0f8ba952d 100644
--- a/core/src/cache/CacheMgr.h
+++ b/core/src/cache/CacheMgr.h
@@ -53,13 +53,16 @@ class CacheMgr {
 
     int64_t
     CacheUsage() const;
+
     int64_t
     CacheCapacity() const;
+
     void
     SetCapacity(int64_t capacity);
 
  protected:
     CacheMgr();
+
     virtual ~CacheMgr();
 
  protected: