Re: [Caml-list] Potential OCaml-ZMQ memory management problems

[Kenneth Adam Miller <kennethadammiller@gmail.com>]

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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.
>>
>
>

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