diff --git a/simple.yml b/simple.yml
index e4a295f4a805ea17ff06958780910b3262625404..71bc51d1a0f30894c48d46eacc9ece634acfe393 100644
--- a/simple.yml
+++ b/simple.yml
@@ -123,7 +123,7 @@ patternset:
     pattern:
       - name: energy_start
         _: 'energy_measure_start:$jube_pat_fp'
-      - name: energy_stop
+      - name: energy_end
         _: 'energy_measure_stop:$jube_pat_fp'
 
 
diff --git a/src/value.py b/src/value.py
index 5e12bfd2c7cd8186366238e9431c83cba117bf06..e5c66da380e5f69f101ba4f4d0d3608437e70f9a 100644
--- a/src/value.py
+++ b/src/value.py
@@ -25,11 +25,13 @@ if __name__ == "__main__":
         string = " " * random.randint(1, 10)
         time.sleep(random.randint(10, 15))
 
-        with open("energy.times", "w") as g:
-            g.write("energy_measure_start:" + str(time.time()) + "\n")
+        if comm.Get_rank() == 0:
+            with open("energy.times", "w") as g:
+                g.write("energy_measure_start:" + str(time.time()) + "\n")
 
         if comm.Get_rank() == 0:
             print("Runtime={}{}".format(string, runtime))
 
-        with open("energy.times", "a") as g:
-            g.write("energy_measure_stop:" + str(time.time()) + "\n")
+        if comm.Get_rank() == 0:
+            with open("energy.times", "a") as g:
+                g.write("energy_measure_stop:" + str(time.time()) + "\n")