Extended HashMap debug output

svn-id: r34051

2 files changed, 35 insertions, 0 deletions

diff --git a/common/hashmap.cpp b/common/hashmap.cpp
index 4749234740..2bd1d48b92 100644
--- a/common/hashmap.cpp
+++ b/common/hashmap.cpp
@@ -89,5 +89,36 @@ uint nextTableSize(uint x) {
 	return primes[i];
 }
 
+#ifdef DEBUG_HASH_COLLISIONS
+static double
+	g_collisions = 0,
+	g_lookups = 0,
+	g_collPerLook = 0,
+	g_arrsize = 0,
+	g_nele = 0;
+static int g_max_arrsize = 0, g_max_nele = 0;
+static int g_totalHashmaps = 0;
+
+void updateHashCollisionStats(int collisions, int lookups, int arrsize, int nele) {
+	g_collisions += collisions;
+	g_lookups += lookups;
+	if (lookups)
+		g_collPerLook += (double)collisions / (double)lookups;
+	g_arrsize += arrsize;
+	g_nele += nele;
+	g_totalHashmaps++;
+	
+	g_max_arrsize = MAX(g_max_arrsize, arrsize);
+	g_max_nele = MAX(g_max_nele, nele);
+
+	fprintf(stdout, "%d hashmaps: colls %.1f; lookups %.1f; ratio %.3f%%; size %f (max: %d); capacity %f (max: %d)\n",
+		g_totalHashmaps,
+		g_collisions / g_totalHashmaps,
+		g_lookups / g_totalHashmaps,
+		100 * g_collPerLook / g_totalHashmaps,
+		g_nele / g_totalHashmaps, g_max_nele,
+		g_arrsize / g_totalHashmaps, g_max_arrsize);
+}
+#endif
 
 }	// End of namespace Common
diff --git a/common/hashmap.h b/common/hashmap.h
index 69f367de97..9b819db5e1 100644
--- a/common/hashmap.h
+++ b/common/hashmap.h
@@ -338,6 +338,10 @@ HashMap<Key, Val, HashFunc, EqualFunc>::~HashMap() {
 		  freeNode(_arr[ctr]);
 
 	delete[] _arr;
+#ifdef DEBUG_HASH_COLLISIONS
+	extern void updateHashCollisionStats(int, int, int, int);
+	updateHashCollisionStats(_collisions, _lookups, _arrsize, _nele);
+#endif
 }
 
 /**