Forum: IronRuby Re: ObjectSpace module

1398f153f25c54309b64df7fded58f6d?d=identicon&s=25 Iulian Fecioru (Guest)
on 2011-09-01 09:08
(Received via mailing list)
Hello,



Sorry for the late reply.



Implementing directly in the libraries will involve adding some logic
somewhere in something like RubyInstanceData (where ObjectID is
implemented, I didn't investigate in detail yet).

We use this feature: object -> object_id -> object.



Thank you!



PS: When a new version of IronRuby will be released?



Regards,

Iulian Fecioru



From: Tomas Matousek [mailto:Tomas.Matousek@microsoft.com]
Sent: Tuesday, August 16, 2011 9:41 AM
To: ironruby-core@rubyforge.org
Subject: Re: [Ironruby-core] ObjectSpace module



This is actually pretty good solution - it's not harming perf of apps
that don't need the feature.

Is there any real-world scenario that this doesn't address?

[Iulian Fecioru] I don't understand the question

Some app translating random integers to objects?

[Iulian Fecioru] I don't understand the question

Until there is I'm not sure if it makes sense to go any further. What
about implementing your approach directly in the libraries?



Tomas



From: ironruby-core-bounces@rubyforge.org
[mailto:ironruby-core-bounces@rubyforge.org] On Behalf Of Iulian Fecioru
Sent: Monday, August 15, 2011 10:35 PM
To: ironruby-core@rubyforge.org
Subject: Re: [Ironruby-core] ObjectSpace module



Hello,



Thank you for your response.

My implementation was a trick to make something working. I think I can
do this more correctly and complete in the IronRuby core.

I'll try to implement this  in IronRuby core, if nobody is against this.
(Something like JRuby has implemented).



Regards,

Iulian Fecioru



From: Tomas Matousek [mailto:Tomas.Matousek@microsoft.com]
Sent: Wednesday, August 10, 2011 7:20 PM
To: ironruby-core@rubyforge.org
Subject: Re: [Ironruby-core] ObjectSpace module



Your implementation of _id2ref might be a good enough approximation. (It
isn't 100% equivalent to MRI though since in MRI I can enumerate
integers and ask if there is an object with that id. So I can get to
objects for which object_id wasn't called before.)



You "become" a developer by submitting a patch on github. No need to
talk to anybody J. Of course, it is better to let folks in this list
know what you're working on so that we don't dup efforts.



Tomas



From: ironruby-core-bounces@rubyforge.org
[mailto:ironruby-core-bounces@rubyforge.org] On Behalf Of Iulian Fecioru
Sent: Tuesday, August 09, 2011 10:51 PM
To: ironruby-core@rubyforge.org
Subject: [Ironruby-core] ObjectSpace module



Hello,



I've wrote on http://ironruby.codeplex.com/workitem/6028 that the
ObjectSpace module is not complete

Comments from the issues above: "

wrote Thu at 11:57 PM

File.realpath is a Ruby 1.9 method we haven't gotten to.

We're unable to implement those methods of ObjectSpace as we can't track
them ourselves as we don't know when the CLR will garbage collect a
specific object, and we don't have access to a list of reachable
objects.

Renaming this issue to track File.realpath



iulianfecioru wrote Fri at 8:27 AM

>From the previous comment I understand that methods from ObjectSpace
(_id2ref, count_objects.) will not be supported.

Is this true?!



PS: I've added _id2ref method to the ObjectSpace, so I think it is
posible but is just my opinion ;)



jimmysch wrote Fri at 4:50 PM

How did you implement _id2ref in IronRuby? I'm 100% sure we can't
implement it without slowing down the entire runtime. ObjectSpace is a
thin wrapper around MRI's memory manager, while on the CLR we don't have
access to it. Therefore, it's more MRI's implementation detail than a
general Ruby feature. And Ruby library writers already know not to use
it if they want to run on all Ruby implementations.



That being said, we could implement it poorly and require the user to
turn it on if they want to use it (like JRuby does:
http://kenai.com/projects/jruby/pages/PerformanceT...
Space), but I don't see that as a priority feature. That being said,
patches are welcome. If you want to discuss this further, let's move
this discussion to the mailing list (ironruby-core@rubyforge.org) or
open a new feature request
(http://ironruby.codeplex.com/WorkItem/Create).

"



I think jimmysch is right about the performance issues, but in my case I
need to have the ObjectSpace.id2ref because we need to send the object
IDs to native languages and retrieve the objects using this object IDs
in IronRuby.

I think that the JRuby solution
(http://kenai.com/projects/jruby/pages/PerformanceT...
tSpace) should be in IronRuby.



I've attached my own trick (I think it is a big performance issue).
Maybe this could be done in a more better way and directly in IronRuby
source code.



Thank you!



PS: I would like to become a developer in this project. With who should
I talk?!



Regards,

________________________________

Iulian Fecioru



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