diff --git a/o_manager.py b/o_manager.py
index 5f866dc..5d4bba0 100644
--- a/o_manager.py
+++ b/o_manager.py
@@ -15,7 +15,7 @@ class OManager:
         self.weights = []
         self.run_task = []
         self.dynamic_weight_fp = None
-        self.PID = None
+        self.pids = []
         if loop:
             self.loop = loop
         else:
@@ -39,17 +39,18 @@ class OManager:
         self.new_idx += 1
         return op
 
-    def generate_lb_cfg(self):
+    def generate_lb_cfg(self, load_balance_mode):
         lb_cfg_fp = os.path.join(
             self.base_folder, "go-socks-lb.yml")
 
         self.dynamic_weight_fp = os.path.join(self.base_folder, "weights.json")
-        with open("go-socks-lb.yml.template", "r") as template_f:
+        with open(f"go-socks-lb-{load_balance_mode}.yml.template", "r") as template_f:
             buf = template_f.read()
         template = Template(buf)
         items = {
             "instances": self.instances,
-            "dynamic_weight_fp": self.dynamic_weight_fp
+            "dynamic_weight_fp": self.dynamic_weight_fp,
+            "load_balance_mode": load_balance_mode
         }
         lb_cfg = template.generate(**items)
         with open(lb_cfg_fp, "wb") as lb_cfg_f:
@@ -91,7 +92,7 @@ class OManager:
         instance["op"].stop()
         instance["weight"] = 0
         self.instances.remove(instance)
-        if len(self.instances)==0:
+        if len(self.instances) == 0:
             self.new_idx = 0
         self.reset_lb()
 
@@ -116,16 +117,15 @@ class OManager:
         self.reset_lb()
 
     def reset_lb(self):
-        try:
-            if self.PID:
-                os.kill(self.PID, signal.SIGINT)
-        except Exception as err:
-            print("kill failed:", err)
+        for pid in self.pids:
+            try:
+                os.kill(pid, signal.SIGINT)
+            except Exception as err:
+                print("kill failed:", err)
         for task in self.run_task:
             task.cancel()
         self.pids = []
         self.run_task = []
-        lb_cfg_fp = self.generate_lb_cfg()
 
         # find running instances
         exist_running_instance = False
@@ -134,9 +134,18 @@ class OManager:
                 exist_running_instance = True
                 break
         if exist_running_instance:
+            # two modes on different ports
+            lb_cfg_fp = self.generate_lb_cfg("fallback")
             lb_cmd = ["go-socks-lb/go-socks-lb", "-config",
                       lb_cfg_fp, "-bind", "0.0.0.0:7000"]
-            #print("lb_cmd", lb_cmd)
+            print("lb_cmd 0", lb_cmd)
+            self.run_task.append(self.loop.create_task(
+                self.run_cmd(lb_cmd)))
+
+            lb_cfg_fp = self.generate_lb_cfg("cached-shuffle")
+            lb_cmd = ["go-socks-lb/go-socks-lb", "-config",
+                      lb_cfg_fp, "-bind", "0.0.0.0:7001"]
+            print("lb_cmd 1", lb_cmd)
             self.run_task.append(self.loop.create_task(
                 self.run_cmd(lb_cmd)))
             #print("pre calc weights:", self.calc_weights())
@@ -177,12 +186,12 @@ class OManager:
             if old_weights != new_weights:
                 old_weights = new_weights
                 print("weight changed, new weights:", new_weights)
-                try:
-                    self.generate_dynamic_weight(
-                        new_weights)
-                    os.kill(self.PID, signal.SIGUSR1)
-                except:
-                    print("error applying weights")
+                self.generate_dynamic_weight(new_weights)
+                for pid in self.pids:
+                    try:
+                        os.kill(pid, signal.SIGUSR1)
+                    except:
+                        print("error applying weights to", pid)
             # else:
                 #print("weight not changed, weights:", new_weights)
 
@@ -194,10 +203,12 @@ class OManager:
                 stdout=asyncio.subprocess.PIPE,
                 stderr=asyncio.subprocess.PIPE)
             self.proc = proc
-            self.PID = proc.pid
-            print(f"Load balancer started, pid: {self.PID}")
+            self.pids.append(proc.pid)
+            print(f"Load balancer started, pids: {self.pids}")
             stdout, stderr = await proc.communicate()
             print(f'[{cmd!r} exited with {proc.returncode}]')
+            if proc.pid in self.pids:
+                self.pids.remove(proc.pid)
             if stdout:
                 print(f'[stdout]\n{stdout.decode()}')
             if stderr:
diff --git a/test.py b/test.py
index 000dae6..5200d25 100644
--- a/test.py
+++ b/test.py
@@ -17,7 +17,7 @@ class MainHandler(tornado.web.RequestHandler):
     def get(self):
         buf = "<html>\n<head><meta http-equiv=\"refresh\" content=\"5\"></head>\n"
         buf += "<body>\n"
-        buf += f"ops len: {len(om.instances)} <br/>\n"
+        buf += f"ops len: {len(om.instances)}, lb pids: {om.pids} <br/>\n"
         if len(om.instances):
             for i in om.instances:
                 op = i["op"]
@@ -25,7 +25,7 @@ class MainHandler(tornado.web.RequestHandler):
                 weight = i["weight"]
                 buf += f"op #{idx}, name: {op.name} <br/>\n"
                 buf += f"status: {op.status}, weight: {weight} <br/>\n"
-                buf += f"pid: {op.pids} <br/>\n"
+                buf += f"op pids: {op.pids}<br/>\n"
                 buf += "log: <br/>\n"
                 buf += "<pre>\n"
                 buf += "\n".join(op.get_log(lines=10))