first version of a memory profiler

doc/estp.txt

@@ -28,6 +28,22 @@ the option ``--stackTrace:on`` is active! Unfortunately this means that a
 profiling build is much slower than a release build.
 
 
+Memory profiler
+===============
+
+You can also use ESTP as a memory profiler to see which stack traces allocate
+the most memory and thus create the most GC pressure. It may also help to 
+find memory leaks. To activate the memory profiler you need to do:
+
+* compile your program with the ``--profiler:off --stackTrace:on -d:memProfiler``
+  command line options
+* import the ``nimprof`` module
+* run your program as usual.
+
+Define the symbol ``ignoreAllocationSize`` so that only the number of 
+allocations is counted and the sizes of the memory allocations do not matter.
+
+
 Example results file
 ====================