OCaml memory profiling with Memprof - TypeRex Utility

Question

My program uses all of available memory, so I wanted to check which functions and abstracts are spoiling my project. I decided to use Memprof, so I installed their compiler and compiled my code with command

ocamlfind ocamlopt -package xml-light unix.cmxa str.cmxa -c -g  NKJPxmlbasics.ml NKJP.mli NKJP.ml test.ml

and then run as suggested in tutorial

ocp-memprof --exec ./test

But there is error instead of result:

Error: no memory profiling information found. Possible causes: - the application was not compiled with memory profiling support; - the application exited before any major garbage collection was performed.

I even managed once to make it work but I have no idea how it happened http://memprof.typerex.org/users/97beffbaec332eb7b2a048b94f7a38cf/2015-12-15_17-33-50_ab17218e800fe0a68fc2cfa54c13bfa6_16194/index.html

Is there any way to use this tool properly in this situation? What am I missing?

What does which ocamlopt return ? Are you sure your executable's name is test ? Your application was running for a (long) moment before crashing with "Out of memory" ? — iguerNL
– iguerNL, Commented Dec 27, 2015 at 19:10
My app didn't crash but was taking about 3 GB before I managed to finally profile memory. I found that in one recursive function I misspelled variable and it caused memory leak. — SzymonPajzert
– SzymonPajzert, Commented Jan 3, 2016 at 12:42

Fabrice Le Fessant · Accepted Answer · 2015-12-28 08:27:43Z

1

ocamlfind ... -c ... does not generate any executable. So, the ./test that you are running was probably generated by a previous command, probably without the memprof switch.

answered Dec 28, 2015 at 8:27

Fabrice Le Fessant

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