diff --git a/backend_test_suite.go b/backend_test_suite.go
index 33d74c6..ac77e8a 100644
--- a/backend_test_suite.go
+++ b/backend_test_suite.go
@@ -35,7 +35,7 @@ type BackendTestSuite struct {
 }
 
 func (ts *BackendTestSuite) SetupSuite() {
-	ts.Trans = newFnMgr()
+	ts.Trans = newFnMgr("")
 	ts.NotNil(ts.Gen)
 }
 
diff --git a/bridge_test.go b/bridge_test.go
index 80bf1ea..691e6d1 100644
--- a/bridge_test.go
+++ b/bridge_test.go
@@ -19,7 +19,7 @@ type bridgeTestSuite struct {
 
 func (ts *bridgeTestSuite) SetupSuite() {
 	ts.eventMux = newMux()
-	ts.trans = newFnMgr()
+	ts.trans = newFnMgr("")
 }
 
 func (ts *bridgeTestSuite) TearDownSuite() {
diff --git a/broker_test_suite.go b/broker_test_suite.go
index 7a38429..e28c3dd 100644
--- a/broker_test_suite.go
+++ b/broker_test_suite.go
@@ -57,7 +57,7 @@ func (ts *BrokerTestSuite) SetupTest() {
 	}
 
 	ts.ConsumerNames = []string{}
-	ts.Trans = newFnMgr()
+	ts.Trans = newFnMgr("")
 }
 
 func (ts *BrokerTestSuite) TearDownTest() {
diff --git a/dingo.go b/dingo.go
index ff395e2..f4a35a1 100644
--- a/dingo.go
+++ b/dingo.go
@@ -100,21 +100,21 @@ type App struct {
 	workers      *_workers
 }
 
-/*NewApp whose "nameOfBridge" refers to different modes of dingo:
+/*NewApp whose "mode" refers to different modes of dingo:
   - "local": an App works in local mode, which is similar to other background worker framework.
   - "remote": an App works in remote(distributed) mode, brokers(ex. AMQP...) and backends(ex. redis..., if required) would be needed to work.
 */
-func NewApp(nameOfBridge string, cfg *Config) (app *App, err error) {
+func NewApp(mode string, cfg *Config) (app *App, err error) {
 	if cfg == nil {
 		cfg = DefaultConfig()
 	}
 	v := &App{
 		objs:     make(map[int]*_object),
 		eventMux: newMux(),
-		trans:    newFnMgr(),
+		trans:    newFnMgr(mode),
 		cfg:      *cfg,
 	}
-	v.b = newBridge(nameOfBridge, v.trans)
+	v.b = newBridge(mode, v.trans)
 
 	// refer to 'ReadMostly' example in sync/atomic
 	v.eventOut.Store(make(map[int]*_eventListener))
diff --git a/id_maker.go b/id_maker.go
index 8acedc2..1540c0c 100644
--- a/id_maker.go
+++ b/id_maker.go
@@ -13,8 +13,10 @@ var ID = struct {
 	Default int
 	// an ID maker implemented via uuid4
 	UUID int
+	// an ID maker implemented by atomic.AddInt64
+	SEQ int
 }{
-	0, 1,
+	0, 1, 2,
 }
 
 /*IDMaker is an object that can generate a series of identiy, typed as string.
diff --git a/mapper_test.go b/mapper_test.go
index 912adad..1b6fed0 100644
--- a/mapper_test.go
+++ b/mapper_test.go
@@ -20,7 +20,7 @@ type mapperTestSuite struct {
 
 func TestMapperSuite(t *testing.T) {
 	suite.Run(t, &mapperTestSuite{
-		_trans:          newFnMgr(),
+		_trans:          newFnMgr(""),
 		_hooks:          newLocalBridge().(exHooks),
 		_tasks:          make(chan *Task, 5),
 		_countOfMappers: 3,
diff --git a/mgr.go b/mgr.go
index 93dde74..84b8ac1 100644
--- a/mgr.go
+++ b/mgr.go
@@ -28,7 +28,7 @@ type fnMgr struct {
 	fn2opt     atomic.Value
 }
 
-func newFnMgr() (c *fnMgr) {
+func newFnMgr(mode string) (c *fnMgr) {
 	c = &fnMgr{}
 
 	// init for marshaller's'
@@ -66,7 +66,13 @@ func newFnMgr() (c *fnMgr) {
 	defer c.imsLock.Unlock()
 
 	ims[ID.UUID] = &uuidMaker{}
-	ims[ID.Default] = ims[ID.UUID]
+	ims[ID.SEQ] = &SeqIDMaker{}
+	switch mode {
+	case "local":
+		ims[ID.Default] = ims[ID.SEQ]
+	default:
+		ims[ID.Default] = ims[ID.UUID]
+	}
 	c.ims.Store(ims)
 
 	// init map from name of function to options
diff --git a/mgr_test.go b/mgr_test.go
index b4b11f6..86a2e3d 100644
--- a/mgr_test.go
+++ b/mgr_test.go
@@ -10,7 +10,7 @@ import (
 
 func TestMgrMarshallers(t *testing.T) {
 	ass := assert.New(t)
-	trans := newFnMgr()
+	trans := newFnMgr("")
 	ass.Nil(trans.Register("TestMgrMarshallers", func() {}))
 	ass.Nil(trans.SetMarshaller("TestMgrMarshallers", Encode.JSON, Encode.GOB))
 	task, err := trans.ComposeTask("TestMgrMarshallers", nil, []interface{}{float64(1)})
@@ -64,7 +64,7 @@ func TestMgrInvokers(t *testing.T) {
 	}
 
 	ass := assert.New(t)
-	trans := newFnMgr()
+	trans := newFnMgr("")
 	ass.Nil(trans.Register("TestMgrInvokers", fn))
 	ass.Nil(trans.SetMarshaller("TestMgrInvokers", Encode.JSON, Encode.JSON))
 
@@ -91,7 +91,7 @@ func TestMgrInvokers(t *testing.T) {
 
 func TestMgrOption(t *testing.T) {
 	ass := assert.New(t)
-	trans := newFnMgr()
+	trans := newFnMgr("")
 
 	// name doesn't register
 	ass.NotNil(trans.SetOption("TestMgrOption", DefaultOption()))
@@ -118,7 +118,7 @@ func TestMgrOption(t *testing.T) {
 
 func TestMgrRegister(t *testing.T) {
 	ass := assert.New(t)
-	trans := newFnMgr()
+	trans := newFnMgr("")
 
 	// register a function, with not-existed marshaller id.
 	ass.Nil(trans.Register("TestMgrResgister", func() {}))
@@ -141,7 +141,7 @@ func (idm *testAlwaysErrorIDMaker) NewID() (string, error) { return "", errors.N
 
 func TestMgrIDMaker(t *testing.T) {
 	ass := assert.New(t)
-	trans := newFnMgr()
+	trans := newFnMgr("")
 
 	// register a function
 	ass.Nil(trans.Register("TestMgrIDMaker", func() {}))
diff --git a/result_test.go b/result_test.go
index bbf14d1..cd88152 100644
--- a/result_test.go
+++ b/result_test.go
@@ -16,7 +16,7 @@ type resultTestSuite struct {
 
 func TestResultSuite(t *testing.T) {
 	suite.Run(t, &resultTestSuite{
-		trans: newFnMgr(),
+		trans: newFnMgr(""),
 	})
 }
 
diff --git a/worker_test.go b/worker_test.go
index 1ed3a33..515be77 100644
--- a/worker_test.go
+++ b/worker_test.go
@@ -18,7 +18,7 @@ type workerTestSuite struct {
 
 func TestWorkerSuite(t *testing.T) {
 	suite.Run(t, &workerTestSuite{
-		_trans: newFnMgr(),
+		_trans: newFnMgr(""),
 		_hooks: newLocalBridge().(exHooks),
 	})
 }