diff --git a/.gitignore b/.gitignore
index 9e0a0b6..2728be8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 .DS_Store
 .idea
 notebooks/.ipynb_checkpoints
+notebooks/multithreading.ipynb
 SimCAD.egg-info
 __pycache__
 Pipfile
diff --git a/SimCAD/engine/simulation.py b/SimCAD/engine/simulation.py
index a0c5d61..271f538 100644
--- a/SimCAD/engine/simulation.py
+++ b/SimCAD/engine/simulation.py
@@ -79,6 +79,7 @@ class Executor:
     def block_pipeline(self, states_list, configs, env_processes, time_seq, run):
         time_seq = [x + 1 for x in time_seq]
         simulation_list = [states_list]
+        # print(len(configs))
         for time_step in time_seq:
             pipe_run = self.mech_pipeline(simulation_list[-1], configs, env_processes, time_step, run)
             _, *pipe_run = pipe_run