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doc/debugging.txt

@@ -76,3 +76,19 @@ Debugging on Mac OS X
  The 'ldd' command doesn't exist, but
   otool -L 
  does almost the same job.
+
+----------------------------------------------------
+Using valgrind to find memory leaks (http://valgrind.org/):
+
+* for vector modules:
+   Support structures are not released by default because it take long time
+   and it is much faster if it is done by system.
+
+   You have to call Vect_set_release_support() before
+   Vect_close() if you want to use valgrind.
+
+  Example (see also http://bambi.otago.ac.nz/hamish/grass/memleak/v.in.ascii/):
+
+    CMD="v.in.ascii -zt z=3 in=lidaratm2_250k.txt out=lidaratm2_250k fs=,"
+    valgrind -v --tool=addrcheck --leak-check=yes --show-reachable=yes $CMD --o
+