diff --git a/python_module/megengine/_internal/persistent_cache.py b/python_module/megengine/_internal/persistent_cache.py
index cbd0027f67874ceff417af25e28f4d231f082e24..47da6637d9b8ab0f6106006ba3e0ab53dad48935 100644
--- a/python_module/megengine/_internal/persistent_cache.py
+++ b/python_module/megengine/_internal/persistent_cache.py
@@ -60,14 +60,7 @@ class PersistentCacheOnServer(_PersistentCache):
     def _conn(self):
         """get redis connection"""
         if self._cached_conn is None:
-            try:
-                self._cached_conn = self.make_redis_conn()
-            except Exception as exc:
-                get_logger().error(
-                    "failed to connect to cache server: {!r}; fallback to "
-                    "in-memory cache".format(exc)
-                )
-                self._cached_conn = _FakeRedisConn()
+            self._cached_conn = _FakeRedisConn()
             self._prefix = self.make_user_prefix()
 
         return self._cached_conn
@@ -76,14 +69,6 @@ class PersistentCacheOnServer(_PersistentCache):
     def make_user_prefix(cls):
         return "mgbcache:{}".format(getpass.getuser())
 
-    @classmethod
-    def make_redis_conn(cls):
-        import redis
-
-        conn = redis.StrictRedis(
-            'localhost', 6381,
-            socket_connect_timeout=2, socket_timeout=1)
-        return conn
 
     def _make_key(self, category, key):
         prefix_with_version = "{}:MGB{}".format(self._prefix, __version__)
@@ -103,31 +88,3 @@ class PersistentCacheOnServer(_PersistentCache):
         return self._prev_get_refkeep
 
 
-def _clean():
-    match = PersistentCacheOnServer.make_user_prefix() + "*"
-    conn = PersistentCacheOnServer.make_redis_conn()
-    cursor = 0
-    nr_del = 0
-    while True:
-        cursor, values = conn.scan(cursor, match)
-        if values:
-            conn.delete(*values)
-            nr_del += len(values)
-        if not cursor:
-            break
-
-    print("{} cache entries deleted".format(nr_del))
-
-
-def main():
-    parser = argparse.ArgumentParser(description="manage persistent cache")
-    subp = parser.add_subparsers(description="action to be performed", dest="cmd")
-    subp.required = True
-    subp_clean = subp.add_parser("clean", help="clean all the cache of current user")
-    subp_clean.set_defaults(action=_clean)
-    args = parser.parse_args()
-    args.action()
-
-
-if __name__ == "__main__":
-    main()
diff --git a/python_module/test/integration/test_fastrun.py b/python_module/test/integration/test_fastrun.py
new file mode 100644
index 0000000000000000000000000000000000000000..8cce8c5930100aa62df17cf78628ead5d2990871
--- /dev/null
+++ b/python_module/test/integration/test_fastrun.py
@@ -0,0 +1,12 @@
+import numpy as np
+
+import megengine as mge
+from megengine.functional.debug_param import set_conv_execution_strategy
+from megengine.module.conv import Conv2d
+
+
+def test_fastrun():
+    set_conv_execution_strategy("PROFILE")
+    x = Conv2d(1, 1, kernel_size=1, bias=True)
+    a = mge.tensor(np.random.randn(1, 1, 1, 1).astype(np.float32))
+    a = x(a)