Improved the structure of the IDLE query

DRAMSys/traceAnalyzer/scripts/metrics.py

@@ -81,41 +81,45 @@ def memory_total(connection):
 def memory_idle(connection):
     # This complex query identifies idle times where the DRAM is not used.
     # The code works also if schedulers are used.
-    subquery = """ -- The subquery selects all TLM phases and sorts them according to BEGIN_RESP
-    	SELECT
-    	    ROW_NUMBER () OVER ( 
-    	    	ORDER BY q.PhaseBegin
-    	    ) RowNum,
-    	    p.PhaseBegin AS BeginRequest,
-    	    p.PhaseEnd   AS EndRequest,
-    	    q.PhaseBegin AS BeginResponse,
-    	    q.PhaseEnd   AS EndResponse
-    
-    	FROM 
-    	    Phases p,
-    	    Phases q
-    		
-    	WHERE
-    	    p.PhaseName = "REQ"
-    	    AND q.PhaseName = "RESP"
-    	    AND p.Transact = q.Transact
-    """
-
-    query = """
-    SELECT sum(b.BeginRequest - a.EndResponse) as idle FROM 
-    (
-        {}
-    ) AS a,
-    (
-        {}
-    ) AS b
-    WHERE
-    		(a.RowNum)=(b.RowNum-1) -- In the list of ordered transactions always compare two adjacent
-    	AND	b.BeginRequest > a.EndResponse; -- This makes sure that no negative summands exists
-    """.format(subquery, subquery)
 
     cursor = connection.cursor()
+
+    query = """
+        DROP TABLE IF EXISTS phasesInOrder;
+    """
     cursor.execute(query)
+
+    query = """
+        -- The temporary table selects all TLM phases and sorts them according to BEGIN_RESP
+        CREATE TEMPORARY TABLE phasesInOrder AS
+        SELECT
+            ROW_NUMBER () OVER (ORDER BY q.PhaseBegin) RowNum,
+            p.PhaseBegin AS BeginRequest,
+            p.PhaseEnd   AS EndRequest,
+            q.PhaseBegin AS BeginResponse,
+            q.PhaseEnd   AS EndResponse
+        FROM 
+            Phases p,
+            Phases q
+        WHERE
+            p.PhaseName = "REQ"  AND
+            q.PhaseName = "RESP" AND
+            p.Transact = q.Transact;
+    """
+    cursor.execute(query)
+    
+    query = """
+        
+        SELECT
+            sum(b.BeginRequest - a.EndResponse) AS idle
+        FROM
+            phasesInOrder AS a, phasesInOrder AS b
+        WHERE
+            (a.RowNum)=(b.RowNum-1) AND -- In the list of ordered transactions always compare two adjacent
+            b.BeginRequest > a.EndResponse; -- This makes sure that no negative summands exists
+    """
+    cursor.execute(query)
+    
     idle = cursor.fetchone()
     if (idle[0] is None):
         return 0