I'm using zmq and ocaml-zmq as installed by opam; I'm not at my work computer or I would provide those details.

Yes, I will try to work on creating a reproducible script

Could it possibly be a call to Tunegc.set_gc () from https://github.com/argp/bap/blob/master/ocaml/tunegc.ml ?

I notice that this error didn't appear in single calls to my utility; basically, I'm using iltrans from bap and I'm using it in a long living process, unlike the current implementation which expects a few transformations and then process death. I did notice that when I run it, if I'm watching system monitor that it begins consuming vast amounts of memory (quickly grows from a few megabytes to 800+) before it hits segfault. Would there be any way to restore the aggressiveness of the GC between calls to iltrans?

On Thu, Dec 4, 2014 at 2:55 AM, Anders Fugmann <anders@fugmann.net> wrote:

Hi Kenneth,

The Ocaml-zmq code copies data from received messages into memory under
the control of the ocaml garbage collector, and immediatly frees the ZMQ buffers.

You do not need to explicitly free the data received from call to recv.

Can you produce a small sample code that exposes the problem? We are using the ocaml-zmq binding extensively, and have not seen any problems.

If I were to take a wild guess, it either a mismatch between library versions or the garbage-collector collecting the socket or zmq context.

What version of the ocaml-zmq bindings and libzmq (c impl) are you using?

/Anders

On 12/04/2014 07:09 AM, Kenneth Adam Miller wrote:

I'm using ocaml-zmq (https://github.com/issuu/ocaml-zmq) and I think I'm
encountering a memory management issue. I could be wrong however, but
basically the issue (I think) is I have a rather large set of messages
to send via zmq, and I'm getting a segfault.

Does anybody know if I need to free the strings received from zmq recv
functions in ocaml? If so how do I do that from ocaml?

There's no code because this is just a general novice ocaml questions.