diff --git a/.gitignore b/.gitignore
index aef4ce1..dbfdab2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -61,6 +61,7 @@ src/tests/test_normalize_path
 src/tests/test_sorted_array
 src/tests/test_sorted_queue
 src/tests/test_thread_local
+src/tests/test_memcpy
 
 # other
 *.swp
diff --git a/src/connection_pool.c b/src/connection_pool.c
index b82223c..5471572 100644
--- a/src/connection_pool.c
+++ b/src/connection_pool.c
@@ -266,7 +266,7 @@ int conn_pool_async_connect_server_ex(ConnectionInfo *conn,
     return result;
 }
 
-static inline void  conn_pool_get_key(const ConnectionInfo *conn,
+static inline void conn_pool_get_key(const ConnectionInfo *conn,
         char *key, int *key_len)
 {
     *key_len = sprintf(key, "%s-%u", conn->ip_addr, conn->port);
@@ -710,7 +710,7 @@ int conn_pool_parse_server_info(const char *pServerStr,
     if (getIpaddrByNameEx(parts[0], pServerInfo->ip_addr,
                 sizeof(pServerInfo->ip_addr),
                 &pServerInfo->af) == INADDR_NONE)
-                {
+    {
         logError("file: "__FILE__", line: %d, "
                 "host: %s, invalid hostname: %s!",
                 __LINE__, pServerStr, parts[0]);
diff --git a/src/tests/Makefile b/src/tests/Makefile
index a3c7040..570084c 100644
--- a/src/tests/Makefile
+++ b/src/tests/Makefile
@@ -11,9 +11,13 @@ ALL_PRGS = test_allocator test_skiplist test_multi_skiplist test_mblock test_blo
            test_server_id_func test_pipe test_atomic test_file_write_hole test_file_lock \
            test_pthread_wait test_thread_pool test_data_visible test_mutex_lock_perf \
            test_queue_perf test_normalize_path test_sorted_array test_sorted_queue   \
-           test_thread_local
+           test_thread_local test_memcpy
 
 all: $(ALL_PRGS)
+
+test_memcpy: test_memcpy.c
+	$(CC) -g -Wall -o $@ $< $(LIB_PATH) $(INC_PATH)
+
 .c:
 	$(COMPILE) -o $@ $< $(LIB_PATH) $(INC_PATH)
 .c.o:
diff --git a/src/tests/test_memcpy.c b/src/tests/test_memcpy.c
new file mode 100644
index 0000000..fb053f7
--- /dev/null
+++ b/src/tests/test_memcpy.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020 YuQing <384681@qq.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the Lesser GNU General Public License, version 3
+ * or later ("LGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the Lesser GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "fastcommon/shared_func.h"
+
+#define BUFF_SIZE  (4 * 1024 * 1024)
+
+int main(int argc, char *argv[])
+{
+    char *buff1;
+    char *buff2;
+    char *dest;
+    int64_t start_time, end_time;
+    char time_buff[32];
+    int i;
+
+    buff1 = malloc(BUFF_SIZE);
+    buff2 = malloc(BUFF_SIZE);
+    dest = malloc(BUFF_SIZE);
+
+    memset(buff1, 'a', BUFF_SIZE);
+    memset(buff2, 'b', BUFF_SIZE);
+    memset(dest, 0, BUFF_SIZE);
+
+    start_time = get_current_time_us();
+    for (i=0; i<16 * 1024; i++) {
+        if (i % 2 == 0) {
+            memcpy(buff2, buff1, BUFF_SIZE);
+        } else {
+            memcpy(dest, buff2, BUFF_SIZE);
+        }
+    }
+
+    end_time = get_current_time_us();
+    printf("time used: %s us\n", long_to_comma_str(
+                end_time - start_time, time_buff));
+    return 0;
+}
+