Index: compile_rules_graph.py
==================================================================
--- compile_rules_graph.py
+++ compile_rules_graph.py
@@ -544,11 +544,11 @@
             print("Unknown line at:", iLine)
             print(sLine)
 
     # processing rules
     print("  processing graph rules...")
-    initProcessPoolExecutor()
+    initProcessPoolExecutor(len(dAllGraph))
     fStartTimer = time.time()
     # build graph
     lResult = []
     nRule = 0
     for sGraphName, lRuleLine in dAllGraph.items():