diff --git a/makefile b/makefile
index e306fdf..5d12de5 100644
--- a/makefile
+++ b/makefile
@@ -48,6 +48,13 @@ $(SRC).o : lib/$(SRC).cpp lib/$(SRC).hpp lib/tdm_datamodel.hpp
 clean :
 	rm -f $(EXE) *.o
 
+# --------------------------------------------------------------------------- #
+# check process
+
+checkps :
+	@ps aux | head -n1
+	@ps aux | grep $(EXE) | grep -v "grep"
+
 # --------------------------------------------------------------------------- #
 # python module
 #
diff --git a/src/main.cpp b/src/main.cpp
index 092eb97..618b73e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,6 +4,8 @@
 
 #include <filesystem>
 #include <regex>
+#include <thread>
+#include <chrono>
 
 // ------------------------------------------------------------------------- //
 
@@ -239,6 +241,8 @@ int main(int argc, char* argv[])
     // }
   }
 
+  std::this_thread::sleep_for(std::chrono::milliseconds(10000));
+
   return 0;
 }