From: Christian Kaiser <chk@...>
Date: 2004-05-28T21:59:57+09:00
Subject: Re: Need help with memory consumption...

Okay, I must correct myself: the count of objects increases.

How can I tell the GC it can free my object, then?

When I put a finalizer on the objects, it's not called unless I call
ruby_cleanup() or ruby_finalize(). So definitely the object is kept in
memory.

So my problem is: I create an object in my C++ code, which is passed to the
scripts, and how can I tell the GC that this object is not needed any more
and can be freed? I'm sure there's no refernce to the object in the script.

Example:

in C++:

    VALUE vMail = rb_define_class("CMail",*RUBYFUNC(rb_cObject));
    rb_define_singleton_method(vMail,"new",RB_METHOD(clsMail::alloc),0);
    ... define some methods
    _vMail = _Ruby.Call(vMail, rb_intern("new"), 0); // rb_protect around
rb_funcall2()...
    rb_gc_register_address(&_vMail);
    ...
    call a script function with _vMail as argument
    _Ruby.Call(rb_cObject, rb_intern("checkTheMail"),1,_vMail);

in the script:

  def checkTheMail(mail)
    ... do something with mail
  end

and in C++ again:

    rb_gc_unregister_address(&_vMail);


Now I would expect that my mail object could be garbage collected - but it
is not. Any ideas welcome.

Christian

"Christian Kaiser" <chk@online.de> wrote in message
news:c92pl1$l7d$1@online.de...
> OS: Windows.
>
> I wrote a DLL which itself uses the Ruby (1.6.8) DLL.
>
> My DLL creates some objects, loads a script, calls some functions in the
> script and destroys the object again. Should be neutral to memory
> consumption. When I issue "ObjectSpace.each_object(Object) {}", I always
get
> the same value (+-5 objects). I call the GC regularly.
>
> Problem is, that when I do that procedure (create an object, call the
script
> functions) multiple times, that the "VM Size" of the process increases
more
> and more.
>
> Background: my DLL is a plugin for the spam fighting tool "SpamPal", and I
> use Ruby to process the mails. I create a "CMail' object, and for each
mail
> I create an instance and call the spam-testing functions. And when I have
> filtered about 1000 mails, VM Size has grown to 400 MB and the computer
runs
> out of virtual memory and crashes.
>
> Is there a problem known, or any way to find the cause?
>
> I would call myself an experienced programmer and I am pretty sure that
the
> memory is NOT used by my DLL, but from the Ruby DLL (which is more or less
a
> black box for me).
>
> I create objects using:
>     VALUE vMail =
RUBYFUNC(rb_define_class)("CMail",*RUBYFUNC(rb_cObject));
>
>
RUBYFUNC(rb_define_singleton_method)(vMail,"new",RB_METHOD(clsMail::alloc),0
> );
>     ... define some methods
>     _vMail = _Ruby.Call(vMail, RUBYFUNC(rb_intern)("new"), 0);
>     RUBYFUNC(rb_gc_register_address)(&_vMail);
>
> and release them by
>
>     RUBYFUNC(rb_gc_unregister_address)(&_vMail);
>
> I would assume that to allow the GC to destroy the objects afterwards,
> correct? Wouldn't the "ObjectSpace.each_object(Object) {}" increase if I
> were leaking objects?
>
>
>
> Thanks for any help I can get!
>
>
>
> Christian
>
>
>
>
>