From: TongKe Xue <tongke@...>
Date: 2007-07-09T07:18:15+09:00
Subject: Re: CPU/Memory limiting

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I can't use Unix processes because we have too many objects. And we don't
wnat to pay the >= 8KB kernel memory for each process.

This is for simple stuff like:

dog:
  if dist(owner) > 5
   go_in_direction_of(owner)

but we have crap loads of these objects; and we want them to be user
scriptable (so C/C++ is a NO NO, we need an interpreted language), but we
don't want people to do crap like:

while(1) {
  get some more memory;
}

or

calculate_ditits_of_pi(*)

On 7/8/07, M. Edward (Ed) Borasky <znmeb@cesmail.net> wrote:
>
> Travis D Warlick Jr wrote:
> > TongKe Xue wrote:
> >>  I'm working on a massive simulation project (like worldforge). I need
> to
> >> be able to allow users to script objects in the world. I am thinking of
> >> ussing Ruby as my scripting language of choice. However:
> >>
> >>  (1) I need to be able to limit the memory usage of the object.
> >>  (2) I need to be able to limit the CPU cycle usage of the object.
> >
> > Try using Process#setrlimit.  That being said, and aside from the fact
> > that I love Ruby -- I don't recommend it for this type of "massive"
> > endeavor.  Always try to choose the best language for your application,
> > not simply "the best language" because there isn't one.
> >
> > As for what I would recommend: Not a scripting language.  For massive
> > projects, use a compiled language on the back-end and then you may
> > integrate it with Ruby on the front-end.
> >
> >   *************************************
> >   *  Travis D Warlick, Jr
> >   *  Lead Developer
> >   *  Operis Systems, LLC
> >   *************************************
> >
> >
> Yes, nearly all of the open-source MMORPG frameworks/games are
> implemented in C/C++ and most of them provide some kind of
> controlled/controllable scripting capability. I did find *one* that is
> Ruby-based (MUES/FaerieMUD) but I was unable to find any evidence that
> it is currently active). "daimonin" seemed to be the closest to "baked"
> but it is masked in Gentoo because of some outstanding security issues,
> so I didn't experiment with it at all.
>
>

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