diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 8b01a7fad0..a13bf3510a 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -127,6 +127,11 @@ static PyTypeObject deque_type;
 static Py_ssize_t numfreeblocks = 0;
 static block *freeblocks[MAXFREEBLOCKS];
 
+static unsigned long long b_allocs = 0;
+static unsigned long long b_frees = 0;
+
+#include <stdio.h>
+
 static block *
 newblock(void) {
     block *b;
@@ -135,6 +140,7 @@ newblock(void) {
         return freeblocks[numfreeblocks];
     }
     b = PyMem_Malloc(sizeof(block));
+    b_allocs++;
     if (b != NULL) {
         return b;
     }
@@ -150,6 +156,8 @@ freeblock(block *b)
         numfreeblocks++;
     } else {
         PyMem_Free(b);
+        b_frees++;
+        printf("%llu : %llu \n", b_allocs, b_frees);
     }
 }